| 摘要 |
<p>A single photon emission computed tomography system produces multiple tomographic images of the type representing a three-dimensional distribution of a photon-emitting radioisotope. The system has 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 is defined through the field of view. A detector module is adjacent the field of view and includes a photon-responsive detector (232). The detector (232) is an elongated strip with a central axis that is generally parallel to the longitudinal axis. The detector (232) is operable to detect if a photon strikes the detector (232). The detector (232) can also determine a position along the length of the strip where a photon is detected. A photon-blocking member is positioned between the field of view and the detector (232). The blocking member has an aperture slot (236) for passage of photons aligned with the aperture slot (236). The slot (236) is generally parallel to the longitudinal axis. A line of response (234) is defined from the detector through the aperture (236). A displacement device moves either the detector module or the photon-blocking member relative to the other so that the aperture (236) is displaced relative to the detector (232) and the line of response (234) is swept across at least a portion of the field of view.</p> |
