No abstract available

[en] The total number of counts required per view for brain and lung scintigraphy to achieve information or count density (CD) of 1000 counts/cm² and 2000 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 2000 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

No abstract available

No abstract available

[en] Thirty patients had bone scintigraphy with both Tc-99m pyrophosphate (Tc-PPi) and Tc-99m diphosphonate (Tc-HEDP). The images were given a composite rating for quality on the basis of three sets of criteria, and were also compared for the number of lesions detected by each agent. The two agents provided no difference in scan quality. Nevertheless, in ten of the 30 patients, at least two of the three readers detected with Tc-HEDP lesions that were not seen with Tc-PPi, and in two such cases all three readers considered the Tc-PPi scan normal. In another of these ten, two of three readers felt the Tc-PPi image was normal, whereas all three detected the lesion with Tc-HEDP. The reverse never occurred