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 and at least one low resolution region (141, 142), wherein size of the detectors is a function of distance from a sagittal plane that passes through the focal spot and axis of rotation and wherein the at least one low resolution region (141, 142) together with the at least one high resolution region define a field of view of the CT scanner; at least one X-Ray shield that reduces the x-ray intensity from the X-ray source toward detectors in the low resolution region (141, 142) as compared to that directed towards detectors in the high resolution region, wherein in the at least one high resolution region the detectors have a high packing density and in at least one low resolution region, 142) the detectors have a low packing density; and a processor adapted to reconstruct images for a region of a body covered by the detector array high resolution region; characterized in that said reconstruction includes: calibrating data acquired responsive to X-rays attenuated by the at least one shield to data acquired responsive to X-rays that are not attenuated by the at least one shield; and processing of data for a region of a body covered by the detector array low resolution region (141, 142) to estimate data that would be acquired for the body region were the detector array low resolution region (141, 142) to have a resolution substantially equal to that of the detector array high resolution region. 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 and at least one low resolution region (141, 142), wherein size of the detectors is a function of distance from a sagittal plane that passes through the focal spot and axis of rotation and wherein the at least one low resolution region (141, 142) together with the at least one high resolution region define a field of view of the CT scanner; at least one X-Ray shield that reduces the x-ray intensity from the X-ray source toward detectors in the low resolution region (141, 142) as compared to that directed towards detectors in the high resolution region, wherein in the at least one high resolution region the detectors have a high packing density and in at least one low resolution region, 142) the detectors have a low packing density; and a processor adapted to reconstruct images for a region of a body covered by the detector array high resolution region; calibrating data acquired responsive to X-rays attenuated by the at least one shield to data acquired responsive to X-rays that are not attenuated by the at least one shield; and processing of data for a region of a body covered by the detector array low resolution region (141, 142) to estimate data that would be acquired for the body region were the detector array low resolution region (141, 142) to have a resolution substantially equal to that of the detector array high resolution region.