Evaluation of Scintigram by Means of Random-dot Model Containing Signal Information

Abstract

The relation between the visual detectability of radioisotope images and the characteristics of recording and detecting system is investigated. A random-dot model containing signal information was used to evaluate the theoretical delectability of the imaging system. To simulate the detection problem of visual signal in the background noise, computer-generated random dot patterns with several values of dot density and dot sizes are used. Simulated microdensitometer scans are examined to see the effect of the aperture size to the detectability of the signal. The visual detectability of random-dot patterns is compared with the theoretical detectability. It is shown that there is a good agreement between the visual detectability and the theoretical detectability.