A CT imaging system includes a two-dimensional detector array and an x-ray source that both revolve around the subject during a scan. The x-ray source produces a cone beam of x-rays and the focal point of this cone beam is electrically moved to different locations along the z-axis to increase the z-axis...http://www.google.fr/patents/US20050100126?utm_source=gb-gplus-shareBrevet US20050100126 - Computed tomography with z-axis scanning
