Quantitative profile scanning for the measurement of organ radioactivity

Publisher Website
Google Scholar
Abstract
A profile scanner has been constructed, forming part of a whole-body counter, with two detectors placed above and below the patient. Variable width collimators are fitted, and a multi-slit focused and limited width collimators are available. The patient lies on a trolley which moves through the well-shielded detector tunnel at variable speeds. The effects of collimator slit width on sensitivity and spatial resolution were studied, as well as methods of compensation for the difference in response due to variations in the depth of a concentration of radioactivity and in the thickness of the body. By using the geometric mean of opposing counts the counting efficiency was found to be largely independent of source depth and size for a wide range of gamma -ray energies. Methods of determining the effective thickness of the body by gamma -ray transmission measurements were developed. The techniques have been applied to a number of clinical and dosimetry problems, with organ activities in the range 0.1 mu Ci to 10 mCi.

This publication has 3 references indexed in Scilit: