Method and apparatus for improving timing resolution of coincident gamma cameras and pet scanners
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United States of America Patent
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Issued Date -
Jun 1, 2006
app pub date -
Oct 11, 2005
filing date -
Oct 12, 2004
priority date (Note) -
Abandoned
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Abstract
A method and an apparatus for determining coincidence between gamma rays arriving at a plurality of detector locations in a camera is provided. Gamma ray signals are received in each of two detector locations. In response to the received signals, pulse signals are generated and sent to a single field-programmable logic chip. The field-programmable logic chip is used to calculate a time delay related to times at which the pulse signals were received. An output signal related to the calculated time delay is then generated and sent to a time-delay converter. The time-delay converter generates a delay time stamp. A gate signal is sent to a plurality of analog-to-digital converters, which then digitize gamma ray signals being received at the two detector locations. Finally, the time delay stamp is added to each of the digitized gamma ray signals.
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