Afterglow DC-offset calibration in a nuclear imaging system
US7355167B2 · kind B2 · utility
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4Claims
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Key dates
| Filing date | Mar 26, 2007 |
| Grant date | Apr 8, 2008 |
| Priority date | — |
| Expiry date | Mar 26, 2027 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B6/4258
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Method and system are provided for calibrating a nuclear medical imaging apparatus for DC shift caused by gamma event afterglow pulses. Detector responses to weak and to high count rate radiation sources are compared with each other, and a zero correction value is incremented until the detector response is the same for the weak source and the high count rate source. The zero correction value is then stored as a static zero correction value, which multiplies a dynamic zero correction value obtained just prior to the occurrence of a gamma event, in order to remove the effects of DC shifts from the output energy signal Esum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.