Material and Techniques
High contrast between different structures is essential for good CT scans. Before embarking on this project we examined several fixed cadaver limbs and noted that fixation caused the CT number of fat and muscles to become similar and induced artifacts. We decided that for our purposes only a nonfixed cadaver could be used for CT scanning. The difficulty in identifying the individual muscles or groups of muscles if the tissue separating them has the same density as the muscle tissue itself is well known. As contrast enhancement could not be performed, we selected a relatively fatty cadaver in order to allow very fine structures, such as nerves, to be recognized on the CT scans and to be identified by reference to the anatomical sections. On several occasions, however, structures seen on the anatomical sections could not be visualized on the CT scans. The above-mentioned advantage of studying a fatty cadaver is accompanied by the disadvantage of a greater chance of encountering structural changes due to osteoarthritis. Unfortunately, several such alterations were observed in the hip and knee regions.
KeywordsFormaldehyde Hydrate Mold Osteoarthritis Gelatin
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