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Fully Bayesian Reconstructions From Single-Photon Emission Computed Tomography Data
Iain S. Weir
Journal of the American Statistical Association
Vol. 92, No. 437 (Mar., 1997), pp. 49-60
Stable URL: http://www.jstor.org/stable/2291449
Page Count: 12
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With suitably chosen priors, Bayesian models are useful in image reconstruction. I consider reconstructions from single-photon emission computerized tomography data using a Gibbs pairwise difference prior. A fully Bayesian approach is presented where the prior parameters are considered drawn from hyperpriors. The approach is problematical, because the normalization constant in the prior is an intractable function of its parameters. Here the constant is estimated off-line by reverse logistic regression. Markov chain Monte Carlo methods are used on simulated and real data to gain estimates of the posterior mean and pixelwise credibility bounds. The resulting reconstructions are compared to those obtained by filtered back-projection, maximum likelihood/EM, and the one-step-late solution to the fixed parameter posterior mode.
Journal of the American Statistical Association © 1997 American Statistical Association