The relationship of information density to pre-set counts obtained in brain, lung and liver scintigraphy

The total number of counts required per view for brain and lung scintigraphy to achieve information or count density (CD) of 1 000 counts/cm2 and 2 000 counts/cm2 for liver scans was examined. To achieve these CDs, 600 000 counts per view are required for brain scans. For the lung, 500 000 counts in anterior and posterior views are required; 400 000 counts in the lateral view are sufficient. For 2 000 CD in the liver scan, 600 000 counts should be obtained in the anterior view and 500 000 in the right lateral. This number of counts assures the desired CD in 97% of cases.