Simultaneous compensation for attenuation, scatter and detector response for SPECT reconstruction in three dimensions
作者： Z Liang , T G Turkington , D R Gilland , R J Jaszczak , R E Coleman
DOI: 10.1088/0031-9155/37/3/007
关键词: Maximum a posteriori estimation 、 Optics 、 Poisson distribution 、 Imaging phantom 、 Image noise 、 Iterative reconstruction 、 Attenuation 、 Shot noise 、 Detector 、 Physics
摘要: A three-dimensional reconstruction method for simultaneous compensation of attenuation, scatter and distance-dependent detector response single photon emission computed tomography (SPECT) is described tested by experimental studies. The determines the attenuation factors recursively along each projection ray starting at intersected source voxel closest to detector. subtracts energy window data from primary compensation. modelled be spatially invariant a constant distance convolves distribution with function compensate response. Poisson noise likelihood smoothed use non-uniform entropy prior searching maximum posteriori probability solution. was using projections acquired chest phantom three-headed system parallel hole collimators. An improvement shown in image noise, recognition object sizes shapes, quantification concentration ratios.
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