Study on the Medical Universal Human Counter (Fourth Report):Whole Body Counting by Linear Scanning

概要

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With our Medical Universal Human Counter (MUHC), whole body counting can be obtained also by summing up the counts of linear scanning. For linear scanning, two detectors with a slit-field collimator are placed symmetrically above and two below the table. The table of the scanning bed is moved automatically along the longitudinal axis. The output signal is fed to an electric recorder through the ratemeter of the spectrometer. Isoresponse curves of this system in air and water were made with various measuring conditions. Most important thing in whole body counting is establishing the way minimizing dependence of count on radioisotope distribution in the body. Whole body counting by linear scanning on our present condition may bring the difference of ±30% at its maximum. But in clinical condition, the difference of counting was less than 5% despite of considerable shift of radioisotope distribution in the body. About 10 μCi of 131I in vivo can be measured with relative statistical error of 5% by linear scanning for 15 minutes.
社団法人日本アイソトープ協会の論文