Patent ID: 9538966
Date: 2017-01-10
CPC Classifications: A61B

Claim:
1. A computed tomography apparatus for odontology, which apparatus comprises an arm part arranged turnable around at least one rotation axis with the help of an actuator, to which arm part and at a distance from each other a radiation source and a receiver of image information have been arranged, said receiver of image information comprising an imaging detector which is an area sensor which during an imaging scan captures a number of frames comprising x-ray image information of the object being imaged, a control system to control said actuator, radiation source and receiver of image information, in which apparatus said arm part is arranged to be located or transferable with respect to the volume desired to become imaged to such location, and the control system to comprise such control routine that when the arm part is turned during an individual imaging scan in which information is gathered for reconstruction of a single volume, at least over a substantial angular range or over the whole angular range used for the individual imaging scan, only a portion of the volume arranged to become imaged is within the radiation beam, characterized in that said control system comprises a first control routine, which is arranged to control said radiation source to produce pulsed radiation and wherein the apparatus comprises a means to measure anode current of the radiation source during an individual radiation pulse and in the event of deviation from a preset value, said first control routine comprises adjusting duration of the radiation pulses such that anode current of the radiation source is measured and the pulse is terminated at the point when integral of the measured current reaches the preset value, whereby upon termination of said radiation pulse the capturing of x-ray image information at said imaging detector also terminates.