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- W2029042079 abstract "This work is part of a project concerned with parallel reconstruction of 3D images from the data delivered by positron emission tomography. The intention of this investigation is the development of a highly efficient parallel-computer assisted PET diagnosis system. Due to the Poisson-nature of positron emission processes, likelihood models can be used for their description. The investigations undertaken are based on an expectation-maximum algorithm that iterates to a maximum likelihood of an estimated radiosity image. A parallel implementation of this algorithm is adapted to the modular architecture of a Quadrics DM-SIMD parallel-computer that can be tailored for special applications. Two approaches are described. The slice-wise approach calculates 15 slices of a 3D data set in parallel, one slice per processor. The systolic approach provides more precise calculations based on direct matrix-vector multiplication while making more efficient use of the Quadrics architecture. Problems are discussed that are raised from the definition of a huge and sparse transition matrix during systolic computation." @default.
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- W2029042079 date "1999-07-01" @default.
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- W2029042079 title "A systolic implementation of the MLEM reconstruction algorithm for positron emission tomography images" @default.
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- W2029042079 doi "https://doi.org/10.1016/s0167-8191(99)00025-3" @default.
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