Over-sampling pet tomograph operating in stationary mode

Details Over-sampling pet tomograph operating in stationary mode Over-sampling pet tomograph operating in stationary mode

G - Physics

01

T

G01T 1/161 (2006.01) G01T 1/29 (2006.01)

Patent

CA 2077735

ABSTRACT OF THE DISCLOSURE The PET apparatus comprises first and second coaxial and laterally adjacent rings of gamma- ray detectors surrounding a subject under study. The detectors of the first ring are angularly offset with respect to the detectors of the second ring. In the apparatus, (a) linear trajectories interconnect in a first direct plane pairs of detectors of the first ring, (b) linear trajectories interconnect in a second direct plane pairs of detectors of the second ring, and (c) linear trajectories interconnect in two cross planes pairs of detectors each formed of one detector of the first ring and one detector of the second ring. Radioactive isotopes are injected into the subject and emit positrons each annihilating with an electron to produce a pair of gamma rays propagating in opposite directions. When the gamma rays of a pair propagate in opposite directions along one of the trajectories, they are detected by the corresponding pair of detectors. A data acquisition circuit stores data indicative of the linear trajectories of the direct and cross planes along which the detected pairs of gamma rays have propagated, and a computer combines these data in a single plane of reconstruction so as to reconstruct in that plane a distribution of sources from which the detected pairs of gamma rays originate. Adequate sampling is provided to achieve maximum resolution of the reconstructed image in stationary mode.

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