CN103126726B - Fat thickness measuring device - Google Patents
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- CN103126726B CN103126726B CN201210031518.2A CN201210031518A CN103126726B CN 103126726 B CN103126726 B CN 103126726B CN 201210031518 A CN201210031518 A CN 201210031518A CN 103126726 B CN103126726 B CN 103126726B
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Abstract
The invention provides a fat thickness measuring device which comprises an ultrasonic probe, a control unit, a display unit and a power supply unit, wherein the ultrasonic probe is used for emitting ultrasonic wave to an object to be measured, receiving ultrasonic echoes of the ultrasonic wave emitted by the ultrasonic probe at the same time, and outputting received ultrasonic echo signals; the control unit is used for controlling the ultrasonic probe to emit the ultrasonic wave, receiving the ultrasonic echo signals outputted by the ultrasonic probe, processing and calculating the ultrasonic echo signals, obtaining the fat thickness of the object to be measured through calculation, and then outputting fat thickness data; the display unit is used for receiving and displaying the fat thickness data outputted by the control unit; and the power supply unit is used for providing electric energy for the ultrasonic probe, the control unit and the display unit. The fat thickness measuring device is small in size, convenient to carry, easy to operate, visualized in numerical reading, and especially suitable for fat thickness monitoring utilization by an individual of families or fitness centers.
Description
Technical field
The invention belongs to technical field of ultrasonic application, be specifically related to a kind of fat thickness measurement device.
Background technology
Along with the change of socioeconomic development and people life style, people's living standard is greatly improved, but this also makes fat phenomenon more and more general, and health problem that is fat and that cause has become the focus that people pay close attention to.
In human body, the percentage composition of fat is the important symbol weighing health status, research shows, have obvious dependency between the Body Mass Index (Body Mass Index: be called for short BMI) of most of individuality and the percentage composition of body fat, therefore some health check-up mechanisms commonly use Body Mass Index to weigh the obese degree of body at present.But reason and the many factors of obesity are closely bound up, and Body Mass Index can not react fat concrete situation all sidedly, and also cannot determine body fat is mainly distributed in which position of health, the fat thickness at certain position of health is specifically how many.
Clinical Practice proves, subcutaneous fat is the key component of body fat, and subcutaneous layer of fat approximately stores 2/3 of body fat total amount.Therefore, measuring subcutaneous fat thickness becomes the availability indexes of total fatty situation in estimated body, in addition, measures also can be corresponding body-shaping slimming method and provide reference frame specific part subcutaneous fat thickness.At present, measure subcutaneous fat thickness common method and comprise sebum meter (also cry and refer to pinching method) and slide calliper rule method, but these two kinds of methods there is certain limitation, and all intuitively can not reflect subcutaneous fat thickness.
In recent years along with the development of Medical Technology, at home and abroad existing using ultrasound method, CT (Computed Tomography: CT technology) method, MRI (Magnetic Resonance Imaging: nuclear magnetic resonance) method etc. measure subcutaneous fat thickness.Think at present, CT method and MRI method measure Fat Distribution and content accuracy and repeatable the best way, but because cost is higher and the reason such as operation inconvenience is unfavorable for carrying out.
Ultrasonic method mainly utilizes ultrasound wave to pass the various difference (as acoustic impedance is different) organizing acoustic characteristic in human body, reflection, refraction and the character of scattering can be produced in the interface of two kinds of not acoustic impedance, by detecting the signal of Different Organs and the different reflection of tissue generation, refraction and Scattering Rules, demonstrate the interface of internal organs and the fine structure of organization internal, in this, as the foundation diagnosed and measure.At present, it is substantially all adopt the B ultrasonic diagnostic equipment that domestic and international application ultrasonic method measures subcutaneous fat thickness, but in practical clinical, the B ultrasonic diagnostic equipment is all be exclusively used in medical diagnosis on disease substantially, and measuring fat thickness is its subsidiary measure the item; And, the B ultrasonic diagnostic equipment is general only just to be had in medical institutions, it is bulky, expensive, and need the specific people possessing relevant medical knowledge could use and measure exactly, also applicable family monitoring fat thickness or gymnasium individual observe fat thickness at any time on the market at present, so that small-sized, the portable fat thickness measurement device of inspection motion at any time and effect of going on a diet.
Summary of the invention
Technical problem to be solved by this invention is for above shortcomings in prior art, there is provided a kind of volume little, portable fat thickness measurement device, use when this fat thickness measurement device especially applicable family monitoring fat thickness or gymnasium individual observe fat thickness at any time.
Existingly also be not exclusively used in the measuring device carrying out fat thickness measurement on the market, at present, the measurement of fat thickness is generally adopting Sono-diagnostic B-mode Scanner to carry out medical diagnosis on disease while, measures subcutaneous fat thickness by way of parenthesis.
By medical ultrasound equipment hierarchical taxonomy, existing ultrasonic diagnostic equipment mainly comprises the A-mode ultrasonic diagnostic equipment and Sono-diagnostic B-mode Scanner.On formation mechenism, Sono-diagnostic B-mode Scanner adopts gray modulation imaging mode, after ultrasonic probe wherein launches ultrasound wave, return a two dimensional slice faultage image, therefore intuitively can arrive the image of each aspect, and intuitively measure, range of application is wider, but what return due to this probe is two dimensional image, thus data volume is also large, is difficult to make portable set; Because the A-mode ultrasonic diagnostic equipment adopts amplitude modulation(PAM) imaging mode, after ultrasonic probe wherein launches ultrasound wave, what return is an One-Dimensional Ultrasonic echo-signal, because this echo-signal can only reflect the information of local organization, the dissection figure needed in clinical diagnosis can not be obtained, and the knowledge figure experience of operator on the accuracy impact of diagnosis very greatly, therefore its using value is gradually low, at present domestic and international all seldom regenerative ratio and the use A-mode ultrasonic diagnostic equipment.
But, the present inventor finds, although the ultrasound echo signal that the ultrasonic probe in the A-mode ultrasonic diagnostic equipment receives cannot obtain the dissection figure required for clinical diagnosis, but this ultrasonic echo carries the primary signal of human tissue structure, containing abundant information source, get rid of the factor that operator has knowledge figure difference, its ultrasound echo signal received can reflect human tissue structure characteristic truly, exactly, by obtaining this ultrasonic echo and carrying out analyzing and processing to it, just can measure and obtain individual subcutaneous fat thickness; And, although the two-dimensional ultrasound faultage image that the ultrasonic echo that in the A-mode ultrasonic diagnostic equipment, ultrasonic probe obtains does not have ultrasonic probe in Sono-diagnostic B-mode Scanner to return is so directly perceived, but what return due to it is an one-dimensional signal, and therefore data volume is little, is comparatively easy to make portable set.
Meanwhile, from human anatomy angle, human body comprises the superficial fascia and deep fascia that spread all over whole body.Wherein, superficial fascia, also known as subcutaneous fascia, is positioned at subcutaneous, is made up of loose connective tissue, mostly containing fat; Deep fascia, also known as fascia propria, is positioned at below superficial fascia, is made up of dense connective tissue, for tissue and blood vessel, the nerve etc. of coated body wall, extremity.And the fatty tissue of human body comprises the fat of subcutaneous fat and the distribution of body inner lamination.Wherein, subcutaneous fat refers to and is stored in subcutaneous fatty tissue, is positioned at skin layer (i.e. skin corium) below, more than deep fascia layer; Body fat mainly refers to the visceral adipose tissue being stored in abdominal cavity and the yellow adipose tissue be present in bone marrow.Because the fat in human body about has 2/3 to be subcutaneous fat, and the fat be distributed in human body viscera is difficult to measure, and therefore the measurement of fat thickness at present is mainly carried out for subcutaneous fat.When ultrasound wave is through human body, subcutaneous fat meets ultrasound wave can produce less intense echo, and this less intense echo is the echogenic dots of dispersion, when ultrasound wave arrives position (i.e. the intersection of fat deposit and fascia layer) of subcutaneous fascia coated fat, the ultrasonic echo of meeting the generation of ultrasound wave back reflection due to fascia is the high strength echo that amplitude is stronger, therefore the ultrasonic echo of ultrasonic probe to this high strength is utilized to receive, and by analyzing the intensity of received ultrasonic echo, thus the ultrasonic echo of the fat deposit that can the identify subcutaneous different depth subcutaneous fascia layer intersection adjacent with this fat deposit, and according to receiving the time of this ultrasonic echo, ultrasound wave can be obtained from entering skin to passing certain fat deposit duration used, because the spread speed of ultrasound wave in tissue is known, pass through compute distance values, finally can obtain the thickness of this fat deposit.
The technical scheme that solution the technology of the present invention problem adopts is that this fat thickness measurement device comprises:
Ultrasonic probe, for launching ultrasound wave to measurand, receiving it simultaneously and launching hyperacoustic ultrasonic echo, and is exported by the ultrasound echo signal received;
Control unit, launching ultrasound wave for controlling ultrasonic probe, receiving the ultrasound echo signal of ultrasonic probe output and processing described ultrasound echo signal and calculate, by calculating the fat thickness of measurand, then these fat thickness data being exported;
Display unit, for receiving the fat thickness data exported with indicative control unit;
Power subsystem, for providing electric energy for ultrasonic probe, control unit and display unit.
Preferably, described control unit comprises:
Transmitter unit, launches ultrasound wave for controlling ultrasonic probe;
Ultrasonic echo processing unit, for receiving the ultrasound echo signal of ultrasonic probe output and processing described ultrasound echo signal, to obtain the ultrasonic echo of the intersection between the fat deposit under skin and the subcutaneous fascia layer under this fat deposit;
Computing unit, for the thickness according to fat deposit under the ultrasonic echo calculating skin obtained, then exports the fat thickness data calculated to display unit.
Preferably, described ultrasonic echo processing unit comprises processing unit and post-processed unit in earlier stage, wherein:
In earlier stage processing unit, the ultrasound echo signal for exporting described ultrasonic probe carries out amplitude amplification and eliminates interference process, and stores after the ultrasound echo signal digitized after process;
Post-processed unit, for extract early stage processing unit in ultrasound echo signal and described ultrasound echo signal is identified, identify the primary event echo of the intersection between the subcutaneous fascia layer under the skin that ultrasonic probe receives under each fat deposit and described each fat deposit, and other multiple-reflection echoes of filtering, then will identify that the primary event echo-signal obtained exports computing unit to;
Described computing unit is used for the primary event echo-signal exported according to post-processed unit, the fat thickness of measurand is calculated by formula h=(T*V)/2, wherein, h represents fat thickness, T represents duration, namely the duration of the primary event echo-signal of the intersection between ultrasound wave that ultrasonic probe the launches subcutaneous fascia layer from entering skin until under receiving skin under innermost fat deposit and this fat deposit is referred to, or refer to primary event echo that ultrasonic probe receives N interface and the time difference of primary event echo receiving (N+1) interface, V represents the spread speed of ultrasound wave in human body, V is preset in computing unit as a fixed value.
Wherein, the spread speed V=1540m/s of ultrasound wave in human body in computing unit is defaulted in described in.
Further preferably, described early stage includes amplifying circuit, filter circuit, detecting circuit, A/D change-over circuit and memorizer in processing unit, wherein:
Amplifying circuit, for receiving the ultrasound echo signal in ultrasonic probe, and amplifies the ultrasound echo signal that ultrasonic probe exports, then is exported by the ultrasound echo signal after amplifying;
Filter circuit, for receiving the ultrasound echo signal that amplifying circuit exports, and the electromagnetic interference wave that wherein mixes of filtering and higher hamonic wave, more filtered ultrasound echo signal is exported;
Detecting circuit, for the ultrasound echo signal that wave reception filtering circuit exports, and carries out peak envelop detection process to the ultrasonic echo circuit received, then is exported by the ultrasound echo signal after peak envelop detection process;
A/D change-over circuit, for converting ultrasound echo signal to digitized ultrasound echo signal, then exports digitized ultrasound echo signal;
Memorizer, for receiving and store the digitized ultrasound echo signal that A/D change-over circuit exports.
Further preferably, include compensating unit, small-signal echo filtering unit, multiple-reflection echoes filtering unit and whole ripple unit in described post-processed unit, in described compensating unit, be preset with compensating factor, wherein:
Compensating unit, for extracting the digitized ultrasound echo signal in memorizer, and the ultrasound echo signal after being compensated after extracted ultrasound echo signal amplitude is added compensating factor, then the ultrasound echo signal after compensating is exported;
Small-signal echo filtering unit, for receiving the ultrasound echo signal after compensating that compensating unit exports, and filtering small-signal echo wherein, then the ultrasound echo signal after filtering small-signal echo is exported;
Multiple-reflection echoes filtering unit, for receiving the ultrasound echo signal that small-signal echo filtering unit exports, and the ultrasound echo signal after filtering small-signal echo is analyzed, therefrom identify the primary event echo of the intersection between the subcutaneous fascia layer under the skin that ultrasonic probe receives under each fat deposit and this fat deposit, other multiple-reflection echoes of filtering, then the primary event echo-signal by filtering after multiple-reflection echoes exports;
Whole ripple unit, for receiving the primary event echo-signal that multiple-reflection echoes filtering unit exports, and carries out whole ripple to it, then exports the primary event echo-signal after whole ripple to computing unit.
Wherein, described compensating factor=penalty coefficient * ultrasonic frequency, described penalty coefficient is set as 0.81dB/cmMHz, and ultrasonic frequency refers to the ultrasonic frequency that ultrasonic probe is launched, and the span of this ultrasonic frequency is 1.5MHz ~ 15MHz.
Preferably, also interface unit is included in this device, described interface unit is delivered to for the fat thickness data calculated by control unit the ultrasound echo signal that external equipment carries out showing or being received by ultrasonic probe and is delivered to and external equipment proceeds process, or for charging to power subsystem.
Preferably, described control unit adopts dsp chip or MCU chip or ARM chip.
Preferred ultrasonic probe is the ultrasonic probe in the A-mode ultrasonic diagnostic equipment, and this ultrasonic probe adopts transmitting-receiving separate type ultrasonic probe.
The invention has the beneficial effects as follows: fat thickness measurement device of the present invention not only can measure the thickness of subcutaneous whole fat deposit, also can check the distribution situation of subcutaneous fat simultaneously as required, and measure the thickness of each fat deposit.This fat thickness measurement device volume is little, be easy to carry, and simple to operate, reading intuitively, is especially applicable to family's monitoring fat thickness or gymnasium individual uses, so that observe the fat thickness of self at any time, inspection motion at any time and the effect of going on a diet, for people keep fit the reference that build provides necessary, thus effectively can reduce the generation of " obesity ".
Accompanying drawing explanation
Fig. 1 is the structured flowchart of one embodiment of the invention fat thickness measurement device;
Fig. 2 is the structured flowchart of ultrasonic echo processing unit in Fig. 1;
Fig. 3 is the oscillogram of the ultrasound echo signal after amplifying circuit amplifies;
Fig. 4 is the oscillogram of the ultrasound echo signal obtained after detecting circuit detection;
Fig. 5 is the oscillogram of the ultrasound echo signal after whole ripple cell processing;
Fig. 6 is the structural representation of ultrasonic probe.
In figure: 1-sound reception layer; The ultrasonic wafer of 2-; 3-acoustic matching layer; 4-launches wafer; 5-insulating barrier; 6-receives wafer.
Detailed description of the invention
For making those skilled in the art understand technical scheme of the present invention better, below in conjunction with the drawings and specific embodiments, fat thickness measurement device of the present invention is described in further detail.
When utilizing the soft tissue on the shallow top layer of ultrasonic measurement human body, distribution according to fascia can by below skin, human body superficial tissue more than deep fascia layer is divided into multilamellar, wherein, fat deposit below skin layer and subcutaneous fascia layer are alternately distributed, interface between the first fascia layer setting below the first fat deposit of immediately skin and the first fat deposit immediately the first fat deposit is the first interface, interface between second fascia layer of immediately the second fat deposit below the second fat deposit below the first fascia layer and the second fat deposit is second contact surface, the 3rd interface between the 3rd fascia layer that the rest may be inferred also may exist below the 3rd fat deposit of below the second fascia layer and the 3rd fat deposit immediately the 3rd fat deposit and more interface.Wherein, multiple subcutaneous fascia layer such as above-mentioned first fascia layer, the second fascia layer, the 3rd fascia layer is the superficial fascia of very thin thickness.
The interface run into based on ultrasound wave between the subcutaneous fascia layer under fat deposit and this fat deposit can produce the characteristic of stronger ultrasonic echo, the ultrasound echo signal that described interface produces is received by fat thickness measurement device of the present invention, amplify and process, and by analyzing the distribution characteristics of received ultrasonic echo, thus the first interface can be identified respectively, second contact surface, the ultrasonic echo at the 3rd interface and more multiple solutions place, the first interface (or second contact surface can be obtained by analyzing, 3rd interface etc.) the primary event echo at place, second-time-around echo ..., again by the waveform of the primary event echo of the intersection between the subcutaneous fascia layer under innermost fat deposit under identifying skin and this fat deposit, and know the time receiving this ultrasonic echo, thus the gross thickness of human body subcutaneous layer of fat can be obtained, more refinement, because the fat deposit below skin layer and the interface between subcutaneous fascia layer have multiple, by identifying the waveform of a ultrasonic echo of a certain interface (such as the first interface), and know the time receiving this waveform, just can calculate the thickness of the first fat deposit.In like manner, the thickness of the second fat deposit, the 3rd fat deposit can be obtained.
As shown in Figure 1, in the present embodiment, this fat thickness measurement device comprises ultrasonic probe, control unit, display unit and power subsystem.
Wherein, ultrasonic probe is used for launching ultrasound wave to measurand, receives it simultaneously and launches hyperacoustic ultrasonic echo, and is exported by the ultrasound echo signal received; Control unit launches ultrasound wave for controlling ultrasonic probe, receiving the ultrasonic echo of ultrasonic probe output and processes described ultrasound echo signal and calculate, by calculating the fat thickness of measurand, then these fat thickness data being exported; Display unit is for receiving the fat thickness data exported with indicative control unit; Power subsystem is used for providing electric energy for ultrasonic probe, control unit and display unit.
Ultrasonic probe is the signal component of whole device, ultrasonic probe and direct body contact when carrying out fat thickness measurement.Whether being same probe according to ultrasonic emitting with receiving, ultrasonic probe can being divided into transmitting-receiving integrated ultrasonic probe and transmitting-receiving separate type ultrasonic probe.In the present embodiment, ultrasonic probe adopts transmitting-receiving separate type ultrasonic probe, it comprises transmitting probe and receiving transducer, and transmitting probe is connected with the transmitter unit in control unit by emission interface, triggers and produce mechanical vibration transmitting ultrasound wave by transmitter unit after being driven; Receiving transducer is connected with the ultrasonic echo processing unit in control unit by receiving interface, sends into ultrasonic echo processing unit process meeting ultrasonic echo that tissue or internal organs back reflection return after entering human body.Transmitting-receiving separate type ultrasonic probe is adopted to have following advantage: one, circuit is simple, efficient.In the present embodiment, the pumping signal that transmitter unit drives transmitting probe to launch is high-voltage pulse, and the device adopted in the ultrasonic echo processing unit be electrically connected with receiving transducer is low-voltage component, according to transmitting-receiving integrated ultrasonic probe, for ensureing the safety of circuit, buffer circuit must be increased before ultrasonic echo processing unit in a control unit, seal in ultrasonic echo processing unit to prevent the high voltage in transmitter unit and burn low-voltage component or the reception of interference ultrasonic echo, thus the circuit in control unit can be caused to become complicated; Its two, transmit and receive highly sensitive.Transmitting-receiving integrated ultrasonic probe collection emission function and receiving function are all over the body, namely in transmitting-receiving integrated ultrasonic probe, transmitting probe and receiving transducer are same piezoelectric, because of piezoelectric character determines its transmitting sensitivity and receiving sensitivity can not be just the same, some piezoelectric transmitting sensitivities are very high and receiving sensitivity is very low, other piezoelectrics then receiving sensitivity are very high and transmitting sensitivity is very low, if make probe integrate launching and receiving function, must make probe can only by with regard to a piezoelectric lower in transmitting sensitivity or receiving sensitivity, this must make the overall sensitivity of transmitting-receiving integrated ultrasonic probe reduce.Receiving and dispatching separate type ultrasonic probe then can make transmitting probe adopt the high piezoelectric of transmitting sensitivity to make easily, and receiving transducer adopts the high piezoelectric of receiving sensitivity to make, thus makes the sensitivity that ultrasonic probe reaches high as far as possible.
Figure 6 shows that the structural representation of ultrasonic probe, wherein, Fig. 6 A is the structural representation of transmitting-receiving integrated ultrasonic probe, in fig. 6, the view in left side is the front view of ultrasonic probe, and the view on right side is the sectional view of described ultrasonic probe (lower same).This transmitting-receiving integrated ultrasonic probe comprises sound reception layer 1, ultrasonic wafer 2 and acoustic matching layer 3; Fig. 6 B is the structural representation of transmitting-receiving separate type plane ultrasonic probe, the structural representation of the transmitting-receiving separate type ultrasonic probe that Fig. 6 C is focus emission, plane receives, Fig. 6 D is planar transmit, the structural representation focusing on the transmitting-receiving separate type ultrasonic probe received, and above-mentioned transmitting-receiving separate type ultrasonic probe comprises sound reception layer 1, acoustic matching layer 3, transmitting wafer 4 (i.e. transmitting probe), insulating barrier 5 and receives wafer 6 (i.e. receiving transducer).
Other unit that power subsystem is this device as the power supply unit of whole system provide stable voltage.In the present embodiment, power subsystem comprises battery, battery charging management circuit and regulating circuit.Wherein, battery generally adopts Large Copacity chargeable lithium cell, and battery can adopt USB interface charging modes to charge, and wireless charging mode also can be adopted to charge, and is beneficial to portable use to make this device; Battery charging management circuit comprises special charging management chip, as CN3052, CN3068 etc., this charging management chip has overvoltage, overcurrent and overheat protector, the height of energy Auto-Sensing cell voltage is to obtain suitable charging current, to protect battery to greatest extent, extend service life of battery, also there is charging process state (low current, big current, be full of) simultaneously and export, make user control the power status of this device at any time; Regulating circuit can make battery realize the output of many power supplys, to meet the different electrical energy demands of unit in this device.
Display unit mainly comprises the LCD display or 0LED display screen with Presentation Function, for showing the fat thickness value obtained after control unit process, so that people can read intuitively.
Control unit, as the central controller of whole measuring device and information processing centre, has following functions: monitor the electricity of power subsystem, is suitable for portable use to make this device; Ultrasound wave is launched for controlling ultrasonic probe, receive the ultrasound echo signal of ultrasonic probe output simultaneously and described ultrasound echo signal is processed and calculated, by calculating the fat thickness of measurand, then export these fat thickness data to display unit.Wherein, control unit mainly comprises transmitter unit, ultrasonic echo processing unit and computing unit.In the present embodiment, control unit can adopt DSP (Digital SignalProcessing) chip or the existing multiple chip with controlling functions such as MCU (Micro Controller Unit) chip or ARM (Advanced RISC Machines) chip.In the present embodiment, control unit adopts the PIC single chip microcomputer chip of band DSP function.
Transmitter unit makes ultrasonic probe obtain the setting voltage of job demand, and produce high voltage negative pulse pumping signal, this high voltage negative pulse pumping signal is delivered to the transmitting probe in ultrasonic probe, transmitting probe is made to produce mechanical vibration and launch ultrasound wave, ultrasonic frequency is determined by the resonant frequency of this ultrasonic probe, and in the present embodiment, the resonant frequency of ultrasonic probe is 5MHz.
Hyperacoustic investigation depth scope that ultrasonic probe is launched can regulate according to actual needs.Research shows, in Different Individual, tissue sound permeability has identical characteristic, the distance of the deep fascia in human body and human body skin layer is generally no more than 120mm, and usually measured fat thickness refers to and the fat deposit that subcutaneous superficial fascia is alternately arranged, it can thus be appreciated that the thickness of fat deposit measured during fat thickness measurement generally can not more than 120mm.Therefore, in the present embodiment, can set hyperacoustic investigation depth is 120mm, can meet the ultrasonic echo data recording one group of complete body fat thickness.Because transmitting probe only accepts a high voltage negative pulse pumping signal in one-shot measurement process, therefore the amplitude of ultrasound echo signal that receiving transducer receives must decay gradually and reduce, even if body fat thickness is more than 120mm, because the ultrasound echo signal that can receive in this place is more weak, thus negligible.Certainly, in actual applications, can suitably adjust hyperacoustic investigation depth according to actual needs, to adapt to the human body of different building shape.
In the present embodiment, ultrasonic echo processing unit is used for carrying out date processing and preservation to the ultrasound echo signal received.Ultrasound wave enters the intersection that human body skin layer meets fat deposit and subcutaneous fascia layer afterwards and reflects, and the ultrasonic echo reflected is received by the receiving transducer in ultrasonic probe, and is sent to ultrasonic echo processing unit.As shown in Figure 2, ultrasonic echo processing unit mainly comprises processing unit and post-processed unit in earlier stage, its, processing unit comprised amplifying circuit, filter circuit, detecting circuit, A/D change-over circuit and memorizer mid-early stage, and post-processed unit comprises compensating unit, small-signal echo filtering unit, multiple-reflection echoes filtering unit and whole ripple unit.
The ultrasound echo signal received due to receiving transducer is generally very faint ultrasound echo signal, for the ease of subsequent treatment, is first amplified by amplifying circuit by the faint ultrasound echo signal received.Figure 3 shows that the oscillogram of the ultrasound echo signal after amplifying circuit amplifies, in figure 3, abscissa is time shaft, also namely represents the degree of depth that ultrasound wave enters inside of human body; Vertical coordinate is the amplitude of ultrasound echo signal, also namely represents the intensity of ultrasonic echo.
In the ultrasound echo signal that receiving transducer receives, carry the human tissue structure feature that human body is abundant, such as: the thickness that intuitively can be reflected tissue interlayer by the ultrasound echo signal reflected between organizational interface; But, in these ultrasound echo signals, also inevitably contain some interfering signals, such as: electromagnetic interference wave, higher hamonic wave and small magnitude signal and their small-signal echoes of producing thereof.
In the present embodiment, by filter circuit, concrete employing band filter eliminates electromagnetic interference wave in ultrasound echo signal and higher hamonic wave.Then, the ultrasound echo signal obtained after filtering carries out peak envelop detection process by detecting circuit again, because the waveform of ultrasonic echo is symmetrical about time shaft (trunnion axis), be reduce data quantitative analyses, in detecting circuit, only get the waveform portion being greater than 0 analyze.The oscillogram of the ultrasound echo signal obtained after detecting circuit detection is shown in Fig. 4.In the diagram, abscissa is time shaft, also namely represents the degree of depth that ultrasound wave enters inside of human body; Vertical coordinate is the amplitude of ultrasonic echo, also namely represents the intensity of ultrasonic echo.
After getting peak envelop detection process, the data volume of ultrasound echo signal reduces, but its data are still continuous time signal, i.e. analogue signal.And in the present embodiment, ultrasonic echo processing unit adopts the PIC single chip microcomputer chip of band DSP function, be generally used for the digital signal that process is complicated, therefore, for the ease of follow-up data process, first the ultrasound echo signal after detection is converted to digitized ultrasound echo signal by high-speed a/d change-over circuit, and preserves in ultrasonic echo data complete for a group after conversion feeding memorizer.Wherein, the sample frequency of A/D change-over circuit is provided by the High-precision high-frequency crystal oscillator be arranged in A/D change-over circuit, synthesis precision and cost consideration, and sample frequency generally selects 3-8 times that needs acquired signal frequency.In the present embodiment, the resonant frequency due to ultrasonic probe is 5MHz, therefore the sample frequency of this crystal oscillator is set to 24MHz.
In the above-mentioned ultrasound echo signal be stored in memorizer, include small-signal echo-signal, the primary event echo-signal of tissue interlayer and multiple-reflection echoes signal.For the ultrasound echo signal of the intersection under accurately extracting human body skin between each fat deposit and subcutaneous fascia layer, post-processed unit in the present embodiment can carry out waveform recognition based on the attenuation compensation of ultrasonic echo distribution characteristics and threshold filter, as shown in Figure 2, wherein post-processed unit comprises compensating unit, small-signal echo filtering unit, multiple-reflection echoes filtering unit and whole ripple unit, and its main working process is as described below.
First, by compensating unit, ultrasonic echo data complete for a group after A/D changes is read out from memorizer.Because ultrasound wave is in tissue communication process, reflection, scattering, refraction and absorbing phenomenon is inevitably produced when running into various different physical interface, thus cause ultrasonic energy decay and produce signal difference, namely along with the increase of ultrasonic propagation distance, the ultrasound echo signal that receiving transducer receives can weaken gradually.Therefore, the decay of ultrasound wave in tissue communication process is compensated by the setting compensation factor in compensating unit, to promote the intensity of distant signal, thus the signal intensity of obtained ultrasonic echo can be made consistent or reach unanimity so that the examination of follow-up data, treatment and analysis.Compensating factor is determined by the decay factor of ultrasound wave in tissue of different frequency, is generally calculate according to the absorptance of ultrasound wave in tissue.Research shows, when ultrasonic frequency is within the scope of 1.5MHz ~ 15MHz, ultrasound wave is almost directly proportional to frequency by the coefficient that tissue absorbs.Therefore, in the present embodiment, the mean absorption coefficient of ultrasound wave in tissue is chosen to be 0.81dB/cmMHz, because the resonant frequency of ultrasonic probe is 5MHz, the penalty coefficient therefore set is 0.81 × 5dB/cm=4.05dB/cm.
According to compensating factor pre-set in compensating unit, attenuation compensation is carried out to ultrasound echo signal, being specially will by distance, the ultrasound echo signal amplitude read from memorizer is added the compensating factor amplitude of corresponding setting, with by ultrasound echo signal strength enhancing to a suitable level, facilitate follow-up process.
Small-signal echo filtering unit is used for the small-signal echo in filtering ultrasonic echo.In the ultrasound echo signal after attenuation compensation, for wherein only occurring once and for the less ultrasound echo signal of amplitude, can thinking that its distribution does not exist any rule, be then judged as small-signal echo-signal and carry out filtering.In the present embodiment, the filtering threshold of small-signal echo is set as empirical value, this empirical value gets the 20-60% of peak-peak in this group measurement data, as shown in Figure 4, waveform B wherein, waveform C, waveform D, waveform H and waveform I owing to being less than the filtering threshold of setting, therefore using they filterings as small-signal echo.In fact, waveform C is the interface of human body mesocuticle layer and skin corium, waveform D is the interface of skin corium and the first fat deposit, because the acoustic impedance of epidermal area, skin corium and the first fat deposit is comparatively close, make the ultrasound echo signal that produces at epidermal area and these two interfaces of skin corium, skin corium and the first fat deposit less; Meanwhile, due to all thinner compared with the first fat deposit with skin corium at human body mesocuticle layer, therefore, in the present embodiment, epidermal area and skin corium are considered as a part for the first fat deposit, and by waveform C and waveform D filtering.
Multiple-reflection echoes filtering unit is used for the multiple-reflection echoes of filtering tissue interlayer.In the present embodiment, which ultrasonic echo judged in received reflection echo by described multiple-reflection echoes filtering unit is primary event echo, and which is multiple-reflection echoes, and by these multiple-reflection echoes filterings, only leaves primary event echo.
In multiple-reflection echoes filtering unit, first the ultrasound echo signal of filtering small-signal echo-signal is utilized Principle of Statistics to add up and divided into groups, the ultrasonic echo wherein with identical characteristics is included into a data set, and adds up the regularity of distribution of each data set.These multiple ultrasonic echos that can be included in same data set are followed successively by the primary event echo of the intersection between a certain subcutaneous fascia layer under a certain fat deposit and this fat deposit, second-time-around echo, triple reflection echo ... n secondary reflection echo, form that the amplitude of multiple ultrasonic echo in this data set is identical or amplitude is close (in ± 20% scope) and probability of occurrence comparatively large (according to circumstances, desirable probability be greater than 20% all reflection echos).As previously mentioned, in the process that ultrasound wave is propagated in tissue, inevitably reflection is produced when running into various different interface, such as, when the first fat deposit under ultrasonic propagation to skin and the first interface between the first subcutaneous fascia layer, strong echo can be produced in the first interface, the ultrasonic echo that first interface first time produced is called primary event echo by the present embodiment, this primary event echo is in the process returned to ultrasonic probe direction, can again reflect when encountering another one intersection (intersection such as between couplant and skin surface), ultrasonic echo after again reflecting is transmitted to the first interface and can reflects again, thus formation second-time-around echo, certainly also triple reflection echo may be formed, four secondary reflection echoes ..., thus vibration is formed between above-mentioned two intersections, till acoustic energy has all been decayed.That is, except part energy is back to receiving transducer in this primary event echo, some to repeat in the first interface multiple reflections occurs, and this repeats to occur the ultrasonic echo of multiple reflections and second-time-around echo, triple reflection echo, four secondary reflection echoes etc. and is called and repeatedly launches echo.The amplitude of these multiple-reflection echoes reduces gradually, and its amplitude is generally the amplitude being less than primary event echo, and the amplitude of order of reflection reflection echo is more at most less.But for same interface, the interval that the multiple-reflection echoes vibrated occur between described two intersections is equal.This is because for the multiple ultrasonic echos be in same data set, all interreflection formation between two interfaces of these ultrasonic echos.In like manner, also there is between the multiple ultrasonic echos in other data sets the equal feature of interval.Accordingly, be easy to just multiple ultrasound echo signals of described filtering small-signal echo-signal to be divided into multiple data set.
For same data set, the amplitude of the multiple ultrasonic echos in this data set is generally unequal, wherein amplitude maximum is primary event echo, and described primary event echo is also time of occurrence ultrasonic echo the earliest in this data set simultaneously, namely primary event echo should be first data in this data set, when calculating fat deposit thickness, by the data filtering of these multiple-reflection echoes, in each data set, can only leave the data of primary event echo.
If calculate the thickness of whole fat deposit, selected data set can be only one group, the data of the primary event echo that the place, boundary between the fascia layer namely under subcutaneous innermost fat deposit and this fat deposit produces.
If the thickness of each fat deposit under will calculating skin respectively, then the data set selected should be many groups.
As shown in Figure 4, waveform B is the primary event echo of intersection between coupling layer and skin surface, if need to calculate respectively the thickness of subcutaneous each fat deposit, then can waveform B position be the benchmark at interval computation time.As can be known from Fig. 4, completely equal to the interval of waveform B with from waveform E to the interval of waveform G from waveform E, thus these two ultrasonic echos belong to a data set.Simultaneously, waveform E is amplitude maximum in this data set, the amplitude of waveform G is less than the amplitude of waveform E, and waveform E is the ultrasonic echo near waveform B in this data set, thus can judge that waveform E and waveform G is respectively primary event echo and the second-time-around echo of this interface, and then the primary event echo that waveform E produces as the first interface between the first fat deposit and the first fascia layer can be judged, and waveform G is the second-time-around echo of waveform E, this data set is defined as the first data set, multiple-reflection echoes filtering unit can by the waveform G elimination in the first data set, only leave waveform E.Due to the position of waveform B corresponding skin surface in described oscillogram, the position at waveform E corresponding first interface in oscillogram, and in the present embodiment, it is part epidermal area and skin corium being considered as the first fat deposit, therefore, then by calculating waveform B and waveform E distance on a timeline, the thickness of the first fat deposit can be calculated.
In the diagram, waveform F and waveform J is respectively two different ultrasonic echos in different pieces of information group, according to above judgement, can learn that waveform F is the primary event echo that the second contact surface place between the second fat deposit and the second fascia layer produces, thus the position of waveform F corresponding second contact surface in oscillogram, by calculating waveform E and waveform F distance on a timeline, the thickness of the second fat deposit can be calculated; In like manner, the position at waveform J corresponding 3rd interface in oscillogram, by calculating waveform F and waveform J distance on a timeline, can calculate the thickness of the 3rd fat deposit.
Wherein, when carrying out the classification of data set, both can the time point of ultrasonic echo that produces of the intersection (i.e. waveform A place) between ultrasonic probe and coupling layer be basis reference to calculate the thickness of fat deposit, can the time point of ultrasonic echo that produces of the intersection (i.e. waveform B place) between coupling layer and skin surface be also that basis reference is to calculate the thickness of fat deposit.Namely the ultrasonic echo in selected data set is all at a certain interface reflection echo that between basis reference, oscillate obtains therewith.When this device is used for somatometry, generally all couplant is scribbled between ultrasonic probe and human body skin layer, in one-shot measurement, the thickness of coupling layer is a definite value, therefore, for above-mentioned two basis references, the interval of the actual ultrasonic echo recorded is a fixed value, and the thickness of any one fat deposit is to should the difference of distance of ultrasonic echo at two interfaces of fat deposit both sides, above-mentioned two kinds of results obtained with reference to benchmarks are therefore utilized to be identical.Therefore, in the diagram, both can the abscissa value at waveform A place be as the initial time calculating fat deposit thickness in Fig. 4, wherein waveform A represents the ultrasonic echo of the intersection between ultrasonic probe and coupling layer, also the supersonic wave synchronism signal of i.e. this device; Again can the abscissa value at waveform B place as the initial time calculating fat deposit thickness, wherein waveform B represents the ultrasonic echo of the intersection between coupling layer and skin surface, i.e. ultrasound wave transdermal and the ultrasonic echo that produces.
As shown in Figure 5, in whole ripple unit, whole ripple is carried out to the above-mentioned waveform having identified the ultrasonic echo of each fat deposit, thus obtains one or more burst pulse square wave, these burst pulse square waves and the interface signals between each fat deposit and adjacent fascia layer.
Here it should be understood that in actual applications, as long as judgement and the identification of follow-up signal would not be had influence at whole wavefront energy filtering multiple-reflection echoes and small-signal echo, and without the need to considering that multiple-reflection echoes and small-signal echo are by the sequencing of filtering.
In computing unit, if measure the thickness of whole fat deposit, the fat thickness of measurand is then calculated by formula h=(T*V)/2, wherein, h represents fat thickness, T represents duration, namely the duration of the primary event echo of the intersection between ultrasound wave that ultrasonic probe the launches subcutaneous fascia layer from entering skin until under receiving skin under innermost fat deposit and this fat deposit is referred to, V represents the spread speed of ultrasound wave in human body, and V is preset in computing unit as a fixed value.In the present embodiment, V=1540m/s is set.Due to the very thin thickness of skin surface and coupling layer, thus ultrasound wave is negligible through the time of skin surface and coupling layer.Corresponding diagram 5, assuming that the fat deposit under skin is only three layers, namely the 3rd interface is the intersection between subcutaneous fascia layer under skin under innermost 3rd fat deposit and this fat deposit, and the time point adopting the ultrasonic echo produced with the intersection (i.e. waveform A ' place) between ultrasonic probe and coupling layer is that basis reference is to calculate the thickness of fat deposit, so duration T is waveform A ' and waveform J ' spacing on a timeline, and namely duration T equals the interval of waveform A ' and waveform J '.
In like manner, if each fat deposit subcutaneous thickness separately will be calculated, then formula h=(T*V)/2 are utilized to calculate the one-tenth-value thickness 1/10 of each fat deposit in tissue according to the interval of the interface signals of each fat deposit and adjacent fascia layer.Duration T represents primary event echo that ultrasonic probe receives N interface and the time difference of primary event echo receiving (N+1) interface.Such as, in Figure 5, if will calculate the thickness of the second fat deposit, then duration T is the interval between waveform E and waveform F.
In the present embodiment, because abscissa is the sampling time, therefore can obtain meeting after ultrasound wave enters tissue priority time sequencing and interval that ultrasonic echo that fat deposit and fascia layer boundary reflection produce returns ultrasonic probe easily, the duration T between the two burst pulse square waves that in Fig. 5, any two interfaces are corresponding is interval; Or, if when abscissa is sampled point, because in the A/D change-over circuit of this device, sample frequency is determined, therefore the sampling period is determined, then the difference of the sampled point sequence number that the two burst pulse square waves that any two interfaces are corresponding are corresponding and sampling period amassing are interval T.Then, the thickness in corresponding tissue between each interface and basis reference is calculated according to this interval T, namely this interval time, T was exactly the propagation distance of ultrasound wave in corresponding two interfaces to the spread speed V of ultrasound wave in tissue long-pending (i.e. T*V), due to ultrasound wave go back to previous interface by a rear boundary reflection from previous interface again to a rear interface time, walked one back and forth, therefore 1/2 (i.e. T*V/2) of this propagation distance is the one-tenth-value thickness 1/10 at these two interfaces.Because the velocity of sound in human body soft tissue is all very close, so in the present embodiment, V=1540m/s is set.For the foregoing reasons, the distance in Fig. 5 often between adjacent two burst pulse square waves is exactly the thickness h of each layer fat deposit, and the distance between first burst pulse square wave and last burst pulse square wave is exactly the thickness of the whole fat deposit of the measured.
Export the fat thickness data calculated to display unit to show.
In order to expand the application of this fat thickness measurement device, in fat thickness measurement device described in the present embodiment, can also interface unit be set, this interface unit comprises USB interface and blue tooth interface, to realize this device and other equipment easily (as computer, mobile phone etc.) connection, namely by USB interface or blue tooth interface, the ultrasound echo signal in memorizer can be sent to other equipment and carry out subsequent treatment, or to be delivered on other equipment by the fat thickness numerical value that this device obtains by USB interface or blue tooth interface and show, or by USB interface, the battery in power subsystem is charged.
Fat thickness measurement device described in the present embodiment is utilized to carry out measuring and the process of ultrasonic echo process is: ultrasonic probe is close to human body skin, open this installation's power source, operator's push key, the transmitting probe that transmitter unit then in control unit controls in ultrasonic probe launches ultrasound wave, ultrasound wave enters human body, propagate in tissue, when often running into the interface of two kinds of not acoustic impedance, part ultrasonic reflections returns to produce ultrasonic echo, this ultrasonic echo is received by receiving transducer, and another part ultrasound wave then moves on through interface; The ultrasound echo signal returned is sent to ultrasonic echo processing unit by the receiving transducer in ultrasonic probe; In early stage processing unit, ultrasound echo signal carries out amplifying through amplifying circuit successively, filter circuit filtering higher hamonic wave signal and electromagnetic interference wave, get the process such as peak envelop detection circuit after, and after the sampling of high-speed a/d change-over circuit, converting the ultrasound echo signal of digital ultrasound to, this digitized ultrasound echo signal is preserved in memory.Etc. measurement data sampling terminate after, namely this measurement data reads out to post-processed unit from memorizer, successively attenuation compensation, filtering small-signal echo and multiple-reflection echoes are carried out to ultrasound echo signal in post-processed unit after, then multiple pulse square waves spaced apart are obtained through whole ripple, calculated the thickness of every layer of fat deposit according to the interval between each pulse square wave by computing unit, or the thickness of whole fat deposit.Like this, by measuring from launching ultrasound wave to the interval receiving ultrasonic echo, the thickness of each layer fat deposit under can obtaining skin, the one-tenth-value thickness 1/10 of each fatty tissue all can directly show, with the person's of being convenient for measuring reading in display unit.
Here it should be understood that, processing mode in the unit of post-processed described in the present embodiment is not limited to aforesaid way, the manner just designs for simple and practical object, and any ultrasound echo signal of ultrasonic fat thickness measurement device provided by the invention collection that makes all should be included in protection scope of the present invention to the processing mode realizing each layer fat thickness measurement; Certainly, measuring device provided by the invention and metering system are also not limited to measure fat thickness, and any application measuring object thickness according to given acoustic velocity value, such as, measure the application of metal thickness, all fall into protection scope of the present invention according to given acoustic velocity value.
Fat thickness measurement device in the present embodiment utilizes ultrasonic echo to return the interval of ultrasonic probe, the distribution situation of different fat tissue layer is obtained in ultrasonic echo processing unit, and then obtain the interval of fat tissue layer, in computing unit, finally obtain the thickness value of fat deposit.This device volume is little, be easy to carry, and simple to operate, reading directly perceived, is especially suitable for family or gymnasium personal monitoring and control fat thickness uses.
Be understandable that, the illustrative embodiments that above embodiment is only used to principle of the present invention is described and adopts, but the present invention is not limited thereto.For those skilled in the art, without departing from the spirit and substance in the present invention, can make various modification and improvement, these modification and improvement are also considered as protection scope of the present invention.
Claims (8)
1. a fat thickness measurement device, is characterized in that, comprising:
Ultrasonic probe, for launching ultrasound wave to measurand, receiving it simultaneously and launching hyperacoustic ultrasonic echo, and is exported by the ultrasound echo signal received;
Control unit, launching ultrasound wave for controlling ultrasonic probe, receiving the ultrasound echo signal of ultrasonic probe output and processing described ultrasound echo signal and calculate, by calculating the fat thickness of measurand, then these fat thickness data being exported;
Display unit, for receiving the fat thickness data exported with indicative control unit;
Power subsystem, for providing electric energy for ultrasonic probe, control unit and display unit;
Described control unit comprises:
Transmitter unit, launches ultrasound wave for controlling ultrasonic probe;
Ultrasonic echo processing unit, for receiving the ultrasound echo signal of ultrasonic probe output and processing described ultrasound echo signal, to obtain the ultrasonic echo of the intersection between the fat deposit under skin and the subcutaneous fascia layer under this fat deposit;
Computing unit, for the thickness according to fat deposit under the ultrasonic echo calculating skin obtained, then exports the fat thickness data calculated to display unit;
Wherein, described ultrasonic echo processing unit comprises processing unit and post-processed unit in earlier stage,
In earlier stage processing unit, the ultrasound echo signal for exporting described ultrasonic probe carries out amplitude amplification and eliminates interference process, and stores after the ultrasound echo signal digitized after process;
Post-processed unit, for extract early stage processing unit in ultrasound echo signal and described ultrasound echo signal is identified, identify the primary event echo of the intersection between the subcutaneous fascia layer under the skin that ultrasonic probe receives under each fat deposit and described each fat deposit, and other multiple-reflection echoes of filtering, then will identify that the primary event echo-signal obtained exports computing unit to;
Particularly, compensating unit, small-signal echo filtering unit, multiple-reflection echoes filtering unit and whole ripple unit is included in described post-processed unit, compensating factor is preset with in described compensating unit, to compensate the decay of ultrasound wave in organizational communication process, make the signal intensity of obtained ultrasonic echo consistent or reach unanimity, wherein:
Compensating unit, for extracting the digitized ultrasound echo signal in memorizer, and the ultrasound echo signal after being compensated after extracted ultrasound echo signal amplitude is added compensating factor, then the ultrasound echo signal after compensating is exported;
Small-signal echo filtering unit, for receiving the ultrasound echo signal after compensating that compensating unit exports, and filtering small-signal echo wherein, then the ultrasound echo signal after filtering small-signal echo is exported;
Multiple-reflection echoes filtering unit, for receiving the ultrasound echo signal that small-signal echo filtering unit exports, and the ultrasound echo signal after filtering small-signal echo is analyzed, therefrom identify the primary event echo of the intersection between the subcutaneous fascia layer under the skin that ultrasonic probe receives under each fat deposit and this fat deposit, other multiple-reflection echoes of filtering, then the primary event echo-signal by filtering after multiple-reflection echoes exports;
Whole ripple unit, for receiving the primary event echo-signal that multiple-reflection echoes filtering unit exports, and carries out whole ripple to it, then exports the primary event echo-signal after whole ripple to computing unit.
2. fat thickness measurement device according to claim 1, is characterized in that,
Described computing unit is used for the primary event echo-signal exported according to post-processed unit, the fat thickness of measurand is calculated by formula h=(T*V)/2, wherein, h represents fat thickness, T represents duration, namely the duration of the primary event echo-signal of the intersection between ultrasound wave that ultrasonic probe the launches subcutaneous fascia layer from entering skin until under receiving skin under innermost fat deposit and this fat deposit is referred to, or refer to primary event echo that ultrasonic probe receives N interface and the time difference of primary event echo receiving (N+1) interface, V represents the spread speed of ultrasound wave in human body, V is preset in computing unit as a fixed value.
3. fat thickness measurement device according to claim 2, defaults in the spread speed V=1540m/s of ultrasound wave in human body in computing unit described in it is characterized in that.
4. fat thickness measurement device according to claim 1, is characterized in that, described early stage includes amplifying circuit, filter circuit, detecting circuit, A/D change-over circuit and memorizer in processing unit, wherein:
Amplifying circuit, for receiving the ultrasound echo signal in ultrasonic probe, and amplifies the ultrasound echo signal that ultrasonic probe exports, then is exported by the ultrasound echo signal after amplifying;
Filter circuit, for receiving the ultrasound echo signal that amplifying circuit exports, and the electromagnetic interference wave that wherein mixes of filtering and higher hamonic wave, more filtered ultrasound echo signal is exported;
Detecting circuit, for the ultrasound echo signal that wave reception filtering circuit exports, and carries out peak envelop detection process to the ultrasonic echo circuit received, then is exported by the ultrasound echo signal after peak envelop detection process;
A/D change-over circuit, for converting ultrasound echo signal to digitized ultrasound echo signal, then exports digitized ultrasound echo signal;
Memorizer, for receiving and store the digitized ultrasound echo signal that A/D change-over circuit exports.
5. fat thickness measurement device according to claim 1, it is characterized in that, described compensating factor=penalty coefficient * ultrasonic frequency, described penalty coefficient is set as 0.81dB/cmMHz, ultrasonic frequency refers to the ultrasonic frequency that ultrasonic probe is launched, and the span of this ultrasonic frequency is 1.5MHz ~ 15MHz.
6. according to the fat thickness measurement device one of claim 1-5 Suo Shu, it is characterized in that, also interface unit is included in this device, described interface unit is delivered to for the fat thickness data calculated by control unit the ultrasound echo signal that external equipment carries out showing or being received by ultrasonic probe and is delivered to and external equipment proceeds process, or for charging to power subsystem.
7. according to the fat thickness measurement device one of claim 1-5 Suo Shu, it is characterized in that, described control unit adopts dsp chip or MCU chip or ARM chip.
8. according to the fat thickness measurement device one of claim 1-5 Suo Shu, it is characterized in that, described ultrasonic probe is the ultrasonic probe in the A-mode ultrasonic diagnostic equipment, and this ultrasonic probe adopts transmitting-receiving separate type ultrasonic probe.
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