AUTOMATIC RECORDING OF THE DISTRIBUTION OF RADIOISOTOPES IN THE BODY

Considering the low gamma-ray intensities available in scintiscanning, or automatic recording of the radioactive isotope distribution in the human organism, optimum adaptation of all factors affecting the quality of the scintigrams is imperative. Therefore, ways have been studied to attain an utmost reduction of the scanning times and the activities applied, at unchanged quality of the scintigrams preferably by proper choice of the collimator set-up and the dimensions of the scintillation crystal. lt became evident that with medium crystal and collimator dimensions in all cases most favorable conditions are obtained. Too small dimensions require an extremely long scanning time, too large dimensions do not give sufficient contrast, thus limiting the possible maximum scanning speed. Moreover, the image-scale reduction as a futher time- saving factor has been incorporated in the Siemens Nucleograph in addition to the mentioned features. (auth)