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Fast methods for including attenuation in the EM algorithm

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2 Author(s)
Hebert, T.J. ; Dept. of Electr. Eng., Houston Univ., TX, USA ; Leahy, R.

A fast approach to including attenuation in iterative maximum-likelihood and least-squares algorithms for single-photon-emission computed tomography (SPECT) is presented. Ray-tracing and summing of attenuation coefficients are replaced by the use of two lookup tables, one to compute attenuated ray path integrals based on a set of polar grid points and one to perform polar-to-rectangular transformations. The resulting algorithm implements a spatial average which is comparable in accuracy to ray-tracing with rectangular pixels, yet requires less than one sixteenth the CPU time

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Nuclear Science, IEEE Transactions on  (Volume:37 ,  Issue: 2 )