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- W2141262166 abstract "We have developed a method using polynomial correction derived from a finite element model (FEM) to correct spatial linearity of scintillation detectors that use position sensitive avalanche photodiodes (PSAPD). A PSAPD is a planar avalanche photodiode with a resistive coating that allows continuous, but non-linear, positioning of scintillation light pulses over the entire active area. The spatial response of a scintillation crystal array coupled to a PSAPD shows a characteristic pincushion distortion when using a linear center of mass positioning calculation. A finite element simulation was used to derive the spatial response function for the PSAPD detector, and then used to calculate a polynomial linearity correction. We performed spatial linearity correction of several flood histograms from a 22Na point source on discrete, scored and continuous crystal arrays of lutetium orthosilicate (LSO). For discrete arrays, spatial linearity correction improves crystal segmentation by correcting the pincushion distorted peaks in the 2-D crystal positioning histogram. For continuous sheets, spatial linearity correction allows for linear positioning over the central part of the crystal array without the use of time consuming spatial calibration measurements" @default.
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- W2141262166 date "2006-03-21" @default.
- W2141262166 modified "2023-09-23" @default.
- W2141262166 title "Finite Element Model Based Spatial Linearity Correction for Scintillation Detectors that use Position Sensitive Avalanche Photodiodes" @default.
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- W2141262166 doi "https://doi.org/10.1109/nssmic.2005.1596839" @default.
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