A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
358/19, 358/11.0
A61B 6/02 (2006.01) A61B 8/13 (2006.01) A61N 5/10 (2006.01) G01T 1/10 (2006.01) G01T 1/164 (2006.01) G01T 1/202 (2006.01) G03B 42/00 (2006.01)
Patent
CA 1303256
Canada Abstract Arrays of scintillation crystals disposed on the circumference of d cylinder are used to detect the annihilation photons emitted after positron decay of isotopes within a body section. At the point of equi-probable depth of gamma ray interaction the surface treatment of each crystal is modified to absorb the light which otherwise would have been reflected by a small length of that surface. While light emitted from the rear of the crystal is nearly constant with depth, light emitted from the top front of the crystal is much reduced if the gamma ray interacts behind the absorbing band. When readout devices measure the light emitted from the top-front and near face simultaneously it is possible to detect the region of interaction. This can be used to improve the spatial resolution of a positron imaging system.
585865
Gowling Lafleur Henderson Llp
Royal Institution For The Advancement Of Learning (the)
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