Multiple Timing Measurements for Positron Emission Tomography

摘要

Timing is determined in positron emission tomography (PET). Two or more different types of timing detection are used for each event. The difference in time from the different types of timing detection may indicate whether or not an error has occurred. An average difference or other typical offset difference may be used to correct the error. During pile up, the difference information may be used to create a missing time, such as using an average difference between second derivative and constant fraction discrimination as an offset to determine constant fraction timing from second derivative timing.

主权项

1. A method for positron emission tomography (PET) coincidence processing, the method comprising:
detecting, with a timing circuit, a first time of a first PET event with a first type of timing measurement; detecting, with the timing circuit, a second time of the first PET event with a second type of timing measurement, the second type different than the first type; determining a difference between the first and second times; comparing the difference with an offset difference; correcting the first time, the second time, or both the first and second times when the difference is greater than the offset difference by at least a threshold amount; and using the corrected first time, second time, or both for the PET coincidence processing.