Performance Analysis of an L-SPECT System with Modular Partial Ring Detectors and Multi-Pinhole Arrays

摘要

Information loss and scanning time in Single Photon Emission Computed Tomography(SPECT) imaging are reduced by applying the plenoptic imaging concept. In this new concept, Lightfield SPECT(L-SPECT) uses a micro range multi-pinhole array as collimators. The amount of information captured in the form of gamma rays depend on the field of view of each pinhole, the distance between the object and the pinhole plane. This paper analyzes the performance of an L-SPECT system with modular partial curved detectors and pinhole arrays, in terms of image reconstruction quality. Multi-pinhole arrays and detectors are curved by tiling small pinhole arrays and detector modules. Tile sizes equal to 1,2 and 3 times that of the pinhole pitch are used for this study and compared with the planar multi-pinhole array. The angle of curvature is calculated by maintaining a fixed object to pinhole gap. Results indicate that, as the size of the tiles decreases, it improves the FWHM of the L-SPECT system. Moreover, the proposed systems reconstruction quality is comparable to that of planar detectors with longer scan times.