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1 July 1990 Improved SPECT via cone-beam collimation, the expectation maximization algorithm, and accurate attenuation correction
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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.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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