Software and event driven baseline correction

Details Software and event driven baseline correction Software and event driven baseline correction

1996-11-25

1997-07-08

Porta, David P.

Radiant energy

Invisible radiant energy responsive electric signalling

With or including a luminophor

25036309, G01T 1164

Patent

active

056464088

ABSTRACT:
A correction system for correcting and maintaining the baseline offset signal value of a PMT channel of a scintillation detector at a predetermined value. The correction system utilizes an event driven mode wherein the correction is performed based on detected gamma interactions and this mode is utilized during periods of high count rate. Using the event driven correction mode, the system provides an output of far PMT channels based on a detected peak PMT channel. In a second mode, software driven correction, false triggers are inserted into the processing logic to initiate sampling of the baseline offset signal value and "simulate" gamma interactions. The false triggers are used by the system to perform baseline correction. The second mode is used during periods of lower count rate. Under both modes, the system effectively samples the baseline offset values from a channel that detects substantially no light energy to sample the baseline offset amount. This sampled value is averaged and compensated for against an ideal reference value, Vm. This is performed independently for each channel.

REFERENCES:
patent: 4882495 (1989-11-01), Tanaka
patent: 5345082 (1994-09-01), Engdahl et al.
patent: 5371362 (1994-12-01), Mestais et al.
patent: 5449897 (1995-09-01), Bertelson et al.

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