A method for adaptive reduction of the dose in an x-ray computer tomography system - -

摘要

The method involves attaching an X-ray source (11) to a rotating gantry (13), which has a device for modulating the X-ray power output, and a detector system (12) for detecting the X-rays from the CT system which have passed through a patient (10). The maximum attenuation value for each projection of the X-rays is calculated. The corresponding angle attenuation profile for the last half rotation of the gantry is stored. The angle attenuation profile to the next half rotation of the gantry is extrapolated. The X-ray power output is modulated so that the X-ray power for the next projection is adjusted to the corresponding attenuation value from the extrapolated profile.