The usual flat rectilinear detector motion in radioisotope scanning is by no means the only one possible, and sometimes changing it is advantageous. In brain scanning, for instance, Reid and Johns (1) have used concentric parasagittal arcs to match the curvature of the head. We have previously suggested that a cylindrical scan path would be useful in scanning the curved surface of the liver (2) and, more recently, we have demonstrated that the detector motion could be modified to make body-section scanning possible (3, 4). This report describes the first clinical use of a scanning instrument which we have constructed to explore the potential of cylindrical and section scanning. Scanning System Mechanical Design: The scanning system includes two opposed scintillation detectors employing 3-in. diameter by 2-in. thick NaI (Tl) crystals, with a minimum of 2-in. of lead side wall shielding, and a choice of focusing collimators designed for different photon energies (5). The mountings permit the detectors to be...