Sparse and energy discriminating collimated detector elements to assist scatter evaluation in CT imaging

摘要

A computed-tomography apparatus that includes a CT scanner including an X-ray source and a detector covering respective angle ranges in the axial and transaxial planes of the CT scanner. The CT detector includes first detector elements disposed on a first surface to capture incident X-ray photons emitted from the X-ray source, and second detector elements sparsely disposed on a second surface different from the first surface, the second surface being farther away from the scanner than the first surface, the second detector elements being smaller in number than the first detector elements. Each of the second detector elements is reachable only by X-ray photons originating in a small angle range around a line connecting the X-ray source and a center of the surface of the detector element, the small angle range being determined by the predetermined distance separating the first and second surfaces and a size of the detector element.

主权项

1. A computed-tomography (CT) detector covering respective angle ranges in the axial and transaxial planes of a CT scanner having an X-ray source, the CT detector comprising:
a plurality of detector elements disposed on a surface to capture incident X-ray photons emitted from the X-ray source; and a plurality of collimators being smaller in number than the plurality of detector elements, the plurality of collimators being sparsely disposed on the surface, wherein each collimator is associated with and collimates one and only one detector element of the plurality of detector elements and has a height determining a small angle range around a line connecting the X-ray source and a center of the surface of the one detector element so as to allow only X-ray photons originating in the small angle range to reach the one detector.