Generally, computed topography (CT) or X-ray computed axial tomography (CAT) images of the body's interior look quite similar to MRI images. However, CT images originate from transmission data created by a rotating X-ray tube. The CT image produces good contrast between fat and lean tissue, but lacks the ability of MRI to provide detailed contrast among or within various tissues and organs in the lean-tissue category. CT is also widely available for human clinical studies, but the equipment is expensive to purchase. CT has been used for body composition analysis in several species, including poul-try, rabbits, swine,[14'15] and, most extensively, sheep.
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