Means for measuring the depth interaction of gamma-rays in scint

Details Means for measuring the depth interaction of gamma-rays in scint Means for measuring the depth interaction of gamma-rays in scint

1989-12-08

1992-06-16

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

With or including a luminophor

25036301, 25036302, 25036303, 250366, 250367, G01T 120, G01T 1202, G01T 1208, G01T 1164

Patent

active

051226677

ABSTRACT:
Arrays of scintillation crystals disposed on the circumference of a 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 rear 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.

REFERENCES:
patent: 4647779 (1987-03-01), Wong
patent: 4677299 (1987-06-01), Wong
patent: 4743764 (1988-05-01), Casey et al.
patent: 4823016 (1989-04-01), Yamashita et al.
patent: 4841153 (1989-06-01), Wormald
patent: 4843245 (1989-06-01), Lecomte
patent: 4870280 (1989-09-01), Yamashita et al.

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