G - Physics – 01 – T
Patent
G - Physics
01
T
358/11.05
G01T 1/161 (2006.01) A61B 6/00 (2006.01) G01T 1/24 (2006.01) G01T 1/29 (2006.01)
Patent
CA 1196732
ABSTRACT OF THE DISCLOSURE A gamma radiation camera and a method are disclosed for creating an image of the radiation density of a source of photons. The camera comprises a detecting device made with solid-state material capable of generating electron-hole pairs as a result of collisions between photons and such material. The detecting device determines the time, location and energy dissipated in a collision between a photon and the solid-state material. The camera further includes an identifying device which identifies as ordered pairs those pairs of said collisions in which both collisions result from a common photon. The camera further includes apparatus for determining an image of said source of photons from the location of the collisions of, and the number of electron-hole pairs generated by at least one collision of, a plurality of such ordered pairs. In a preferred embodiment the detecting device determines the time, location, and energy of collisions by sensing the occurrence, location and number of electron-hole pairs, respectively, generated by each such collision. The identifying device includes apparatus for selecting as an ordered pair a pair of collisions which occur at substantially the same time, indicating that the ordered pair results from a common photon. The apparatus for determining an image includes a first line determining device for determining a collision line between two collisions of an ordered pair, and an angle determining device responsive to the energy of at least one of the collisions of a selected pair, for determining the angle of Compton scattering -2- relative to the collision line which occurs at a first of the collisions of such a selected pair. In a preferred embodiment the gamma camera includes a parallel plate collimator placed between the detecting device and the position at which the source of photons is to be located, so that the substantial majority of photons which reach the detecting device are traveling generally parallel to a known collimation plane. In such a preferred embodiment, the gamma camera further includes a second line determining device for determining a second line parallel with the collimation plane which forms the determined Compton scattering angle with the collision line at the location of the first collision of the selected pair.
429599
E. I. Du Pont de Nemours And Company
Marcoux & Sher Swabey Mitchell Houle
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