Variable angular sampling rate for rotating slat-hole detectors of gamma cameras

摘要

A subject (10) is disposed adjacent a linear detector array (18) of a nuclear camera. The subject (10) is injected with a radioactive isotope (14) and y-ray emissions indicative of nuclear decay are detected at the detector array (18) as the detector array rotates about an axis of rotation to collect data over a circular field of view. Detectors farther from the axis rotation are sampled at a higher sampling rate such that the are sampled after a generally constant arc of rotation to correct for angular aliasing. The detector array (18) rotates about the axis of rotation in a 1/sin THETA pattern with angular offset of the detector array from a longitudinal axis of the subject. This corrects for otherwise uneven sampling. A reconstruction processor (84) reconstructs the identifications of the y-ray receiving detectors, or other indicators of event detection location, and the digital peak values to generate a spherical image representation.