A New Positioning Algorithm for Position-Sensitive Avalanche Photodiodes

We are using a novel position sensitive avalanche photodiode (PSAPD) for the construction of a high resolution positron emission tomography (PET) camera. Up to now most researchers working with PSAPDs have been using an Anger-like positioning algorithm involving the four corner readout signals of th...

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Bibliographic Details
Published in:IEEE transactions on nuclear science 2007-06, Vol.54 (3), p.433-437
Main Authors: Zhang, Jin, Olcott, Peter D., Levin, Craig S.
Format: Article
Language:English
Subjects:
Algorithms
Arrays
Avalanche photodiode
Avalanche photodiodes
Avalanches
Cameras
Corners
Distortion
Floods
Histograms
Logic
Nonlinear distortion
Photodetectors
Photonic crystals
positioning algorithm
Positron emission tomography
Solid scintillation detectors
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Summary:We are using a novel position sensitive avalanche photodiode (PSAPD) for the construction of a high resolution positron emission tomography (PET) camera. Up to now most researchers working with PSAPDs have been using an Anger-like positioning algorithm involving the four corner readout signals of the PSAPD. This algorithm yields a significant non-linear spatial ldquopin-cushionrdquo distortion in raw crystal positioning histograms. In this paper, we report an improved positioning algorithm, which combines two diagonal corner signals of the PSAPD followed by a 45degC rotation to determine the X or Y position of the interaction. We present flood positioning histogram data generated with the old and new positioning algorithms using a 3times4 array of 2times2times3mm and a 3times8 array of 1times1times3 mm 3 of LSO crystals coupled to 8times8 mm 2 PSAPDs. This new algorithm significantly reduces the pin-cushion distortion in raw flood histogram image.
ISSN:0018-9499
1558-1578
DOI:10.1109/TNS.2007.894129