Method for reducing an electronic time coincidence window in...

Details Method for reducing an electronic time coincidence window in... Method for reducing an electronic time coincidence window in...

2008-07-22

2008-07-22

Porta, David P. (Department: 2884)

Radiant energy

Invisible radiant energy responsive electric signalling

With or including a luminophor

Reexamination Certificate

active

11265758

ABSTRACT:
A method for acquiring PET images with reduced time coincidence window limits includes obtaining a preliminary image of a patient within a radiation field of view (FOV), determining the spatial location of the patient within the FOV based on the preliminary image, calculating a different time coincidence window based on the spatial location of the patient for each possible pair of oppositely disposed detectors, scanning the patient with a PET scanning system to detect a pair of gamma photons produced by an annihilation event, determining whether the detection of the pair of gamma photons occurs within the time coincidence window, accepting the detected event only if the detection of the gamma photons occurs within the time coincidence window, calculating the spatial location of accepted annihilation event, and adding the calculated spatial location of the annihilation event to a stored distribution of calculated annihilation event spatial locations representing the distribution of radioactivity in the patient.

REFERENCES:
patent: 2004/0195512 (2004-10-01), Crosetto
patent: 2005/0067571 (2005-03-01), Yanagita et al.
patent: 2006/0065825 (2006-03-01), Ishitsu et al.
patent: 2006/0074292 (2006-04-01), Thomson et al.
patent: 2006/0178575 (2006-08-01), Piacsek et al.
patent: 2006/0197025 (2006-09-01), Burr et al.
patent: 2007/0010731 (2007-01-01), Mistretta
patent: 2007/0167749 (2007-07-01), Yarnall et al.

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