METHOD AND APPARATUS FOR ULTRA FAST SYMMETRY AND SIMD BASED PROJECTION-BACKPROJECTION FOR 3D PET IMAGE RECONSTRUCTION

摘要

A method and an apparatus for fast symmetry and SIMD(Single Instruction Multiple Data) based forward projection-back projection for reconstructing a 3D PET(Position Emission Tomograph) image are provided to reduce an interpolation process from three to one dimension by using a rotation based projection or an alignment frame scheme. Plural reaction lines are detected from a predetermined object. The reaction lines are converted to first sinogram data. The first sinogram data is projected into plural projection angles, so that image data of the object is generated. The generated image data is projected into plural projection angles, so that second sinogram data is obtained. During a back-projection process, the first sinogram data is filled in pixels of an image plane corresponding to the plural projection angles, and coordinate axes of the image plane are rotated by a predetermined angle, so that the image data is obtained. During the projection process, the image data is rotated in an opposite direction by the corresponding projection angle. The back-projection and projection processes use a symmetrical property of a coordinate space.