Improved SPECT via cone-beam collimation, the expectation maximization algorithm, and accurate attenuation correction

A. Welch; Stephen E. D. Webb; M. Flower

doi:10.1117/12.18810

1 July 1990 Improved SPECT via cone-beam collimation, the expectation maximization algorithm, and accurate attenuation correction

A. Welch, Stephen E. D. Webb, M. Flower

Author Affiliations +

Proceedings Volume 1231, Medical Imaging IV: Image Formation; (1990) https://doi.org/10.1117/12.18810
Event: Medical Imaging '90, 1990, Newport Beach, CA, United States

Abstract

The Expectation Maximisation (EM) algorithm for computing the Maximum Likelihood image has been applied to both simulated and experimental cone-beam SPECT projection data. Reconstructions of simulated data show the superiority of the EM algorithm over a convolution and backprojection (CBP) algorithm with respect to image uniformity across the field of view and tolerance to noise. Phantom studies demonstrate the need for an accurate attenuation correction routine. A method of correcting for photon attenuation has been applied to the EM algorithm assuming the object to be a uniform attenuator. A method of extending this to allow for non uniform photon attenuation is also proposed.

Citation Download Citation

A. Welch, Stephen E. D. Webb, and M. Flower "Improved SPECT via cone-beam collimation, the expectation maximization algorithm, and accurate attenuation correction", Proc. SPIE 1231, Medical Imaging IV: Image Formation, (1 July 1990); https://doi.org/10.1117/12.18810

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