Patent ID: 7012257
Filing Date: 2006-03-14
Classification: A61B,G01T,G21K

Abstract:
1. single photon emission computed tomography system for producing multiple tomographic images of the type representing a three-dimensional distribution of a photon-emitting radioisotope, the system comprising: a base including a patient support for supporting a patient such that a portion of the patient is located in a field of view, a longitudinal axis being defined through the field of view; a detector assembly adjacent to the field of view, the detector assembly extending at least partially about the field of view between a first end and a second end, the first and second ends being spaced apart so as to define an entry opening to the field of view, the detector assembly being operable to detect if a photon strikes the detector assembly; a collimating assembly including at least two spaced apart collimating vanes of photon-attenuating material, each of the vanes being disposed between the detector assembly and the field of view; a generally arcuate photon-blocking member disposed between the field of view and the detector assembly, the blocking member having a plurality of aperture slots defined therethrough at intervals along the member for passage of photons aligned with the aperture slots, lines of response for the detector assembly being defined from the detector assembly through the aperture slots; and a displacement actuator operable to move the photo-blocking member relative to the detector assembly such that the aperture slots are displaced relative to the detector assembly and the lines of response are swept across at least a portion of the field of view.