NEW TRANSVERSE-SECTION BRAIN IMAGER FOR SINGLE-GAMMA EMITTERS

Abstract

Physical and clinical data on a new emission transverse-section scanner are given. Comparative data from an earlier tomoscanner and a rotating gamma-camera system yielded information for the 3 imagers. Resolution at the center of the field is 9 mm for this tomoscanner, 18 mm for the earlier tomoscanner and 11 mm for the rotating camera; sensitivity (cps/.mu.Ci-ml) 36K, 15.4K, 1.9K; cyrstal area (cm2) 3096, 619, 490, respectively. The quantification of images was discussed. Clinical emission section scans of the brain, liver, chest and skull were presented and discussed. Forty human brain scans were analyzed in conjunction with X-ray transmission tomography. No false positives were found. From a total of 15 lesions seen by the CT X-ray scanner, 14 were detected by the emission tomographic scanner, 12 by standard gamma-camera imaging. One false negative case (cyst) was seen by the transmission X-ray scanner but not by the emission scanner.