Method and apparatus for vetoing random coincidences in...

Radiant energy – Invisible radiant energy responsive electric signalling – With or including a luminophor

Reexamination Certificate

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Reexamination Certificate

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11083322

ABSTRACT:
An improved gamma ray detector and method for discriminating between “true” pairs of gamma rays produced by a single positron annihilation event and those randomly occurring “pairs” of gamma rays that may fall within the conventional acceptance criteria for “true” pairs. The gamma ray detector incorporates an additional array of “veto” detectors arranged adjacent or around a primary detector array. The array of “veto” detectors is configured to detect gamma rays that escape detection in the primary detector array. The detection data from both the primary detector array and the veto detector array are used as inputs into a discrimination circuit for “vetoing” those pairs of gamma rays detected by the primary detector array that are likely to be the result of two or more unrelated positron annihilation events. By increasing the proportion of “true” events used in image reconstruction, the apparatus and method may improve the quality of the resulting image, reduce the image processing time and/or reduce the need for subsequent data collection and/or manipulation.

REFERENCES:
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patent: 6100532 (2000-08-01), Bryman
patent: 6294788 (2001-09-01), Cooke et al.
patent: 2004/0007670 (2004-01-01), Bryman
patent: 57131086 (1982-08-01), None
K. Masuda et al., “Test of a Dual-Type Gridded Ionization Chamber Using Liquid Xenon,” Nuclear Instruments and Methods 174 (1980) pp. 439-446.
S. Adler et al., “Further Evidence for the Decay K+→ π+,” The American Physical Society, vol. 88, No. 4, Jan. 28, 2002, pp. 041803-1-041803-4.
K. Masuda et al., “Liquid Xenon Position Sensitive Gamma-Ray Detector for Positron Annihilation Experiments,” Nuclear Instruments and Methods 188 (1981) pp. 629-638.
M.I. Lopes et al., “Positron Emission Tomography Instrumentation: Development of a Detector Based on Liquid Xenon,” Proc. Calorimetry in High Energy Physics (1999), pp. 675-680.

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