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Title: Statistical analysis of sheep CAT scan images using a Bayesian mixture model
Contributor(s): Alston, C L (author); Mengersen, K L (author); Thompson, John Mitchell  (author); Littlefield, Patrick John  (author); Perry, Diana (author); Ball, A (author)
Publication Date: 2004
DOI: 10.1071/AR03017
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Abstract: CAT scanning techniques are available to provide images that can aid in the assessment of carcass traits in live sheep during the course of animal experiments. In this paper we present a Bayesian formulation of an analysis that allows us to determine the composition of a scan in terms of proportions of the image attributable to fat, muscle (lean tissue), and bone. The technique, known as finite mixture modelling, also provides information about the distributional properties of some of these components, such as fat and bone. In the case of muscle, the analysis estimates several Gaussian distributions that combine to provide an approximation to its likelihood. The model is estimated through the use of the Gibbs sampler, with the distributional properties of carcass components being obtained from the resultant Markov chains.
Publication Type: Journal Article
Source of Publication: Australian Journal of Agricultural Research, 55(1), p. 57-68
Publisher: CSIRO Publishing
Place of Publication: Melbourne, Australia
ISSN: 0004-9409
Field of Research (FOR): 060604 Comparative Physiology
Socio-Economic Objective (SEO): 830310 Sheep - Meat
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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