Computed Radiography

Because of the inherent characteristics of the system, the kVp needs to be increased to a minimum of 70 if CR is employed. To provide adequate coverage of the image receptor, the same SID as described earlier would be required. Although it is frequently stated in the literature that when using CR the mAs should be reduced by 50% from the conventional radiographic technique, this has not been our experience. Even though the kVp is increased over the setting noted previously, the initial mAs value should be at least that used for a conventional screen/film system. A good starting point for mummified remains at a 40 in. (100 cm) SID would be 70 kVp at 10 mAs. There are two principal advantages of CR. The first is the elimination of wet processing and everything associated with the need to handle and transport the chemicals. The second is the ability to postprocess the image without having to take additional exposures. The latter not only reduces the amount of time required to complete the study but also reduces the radiation exposure to those involved in the project. A major disadvantage with the medical CR systems is that the algorithms were developed for hydrated living bodies. The authors suggest that a more successful approach may be to use a nonmedical CR system and apply various industrial algorithms during postprocessing to produce the most detailed image.

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