Title:
陽電子放出断面撮影におけるランダム同時発生を否認する方法および機器
Document Type and Number:
Japanese Patent JP2007529750
Kind Code:
A
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.
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Inventors:
Bryman, Douglas
Application Number:
JP2007504122A
Publication Date:
October 25, 2007
Filing Date:
March 18, 2005
Export Citation:
Assignee:
Triumph, Operating As A Joint Venture By The Governor's Of The University Of Alberta, The University Of British Columbia, Carlton
International Classes:
G01T1/161; G01T1/164; G01T1/172
Domestic Patent References:
| JPH0264496A | 1990-03-05 | |||
| JP2001356172A | 2001-12-26 | |||
| JPS57131086A | 1982-08-13 | |||
| JPH0264496A | 1990-03-05 | |||
| JP2001356172A | 2001-12-26 | |||
| JPS57131086A | 1982-08-13 |
Foreign References:
| US5821541A | 1998-10-13 | |||
| US5821541A | 1998-10-13 |
Attorney, Agent or Firm:
Kenzo Hara International Patent Office