Patent ID: 8180017

Claim:
A computed tomography apparatus comprising: a gantry which rotates on an axis of rotation around an examination region; a dual beam radiation source mounted on the gantry which dual beam radiation source propagates at least two cone-beams of radiation into the examination region, the dual beams of the dual beam radiation source being aligned in a direction parallel with the axis of rotation and oriented toward each other providing overlap of cone beams within the field of view; a common detector which detects the radiation from the two cone-beams which has passed through the examination region; a pulse controller which pulses the cone-beams of radiation alternatively; and an attenuation system interposed between the radiation sources and the examination region for cone-angle dependent filtering of the cone beams in an axial direction, the attenuation system including filters of thickness which increase in the direction of overlap of the dual beams in the field of view.