Abstract
The planning of radiotherapy may include localization of organs not readily seen on plain X-ray films. Covington and Buzzi (1972) have described a method based on scintigrams which does not take account of the divergence of the treatment beam. Other reported methods include ultrasound (Sanders et al., 1974) and computed tomography (Chernak et al., 1975). In irradiation of the spleen the standard method described by Johnson (1973) is not reliable due to the great variation in splenic position (Kreel and Mindel, 1969). There may be medical contraindications to the use of iodine contrast medium in defining the optimum shielding of kidneys. The localization of liver metastases, pancreas or other target volumes by radionuclide imaging may also be indicated in radiation therapy.
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