Patent ID: 8111804
Filing Date: 2012-02-07
Classification: A61B,G01N,G01T

Abstract:
1. A CT scanner comprising: a rotor rotatable about an axis of rotation; an X-ray source mounted to the rotor having a focal spot from which an X-ray beam emanates; an X-ray detector array comprising a plurality of X-ray detectors for detecting X-rays in the X-ray beam that have been attenuated by an imaged body, wherein the detector array has at least one high resolution region in which detectors have a high packing density and at least one low resolution region in which detectors have a low packing density; X-ray radiation shielding plate that attenuates X-rays provided by the X-ray source adapted to attenuate only the X-rays impinging on the at least one low resolution region; and a processor that processes attenuation data acquired with the detector array and calibrates data acquired responsive to X-rays attenuated by the shielding in the at least one low resolution region to data acquired responsive to X-rays in the high resolution region.