Cellular automaton-based position sensitive detector equalization

Research areas:
Authors:
Ferrando, Néstor; Herrero, V.; Cerdà, J.; Lerche, C. W.; Colom, R. J.; Gadea, R.; Martínez, J. D.; Monzó, J. M.; Mateo, F.; Sebastià, A.; Benlloch, J. M.
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Type of Publication:
Journal:
Volume:
Number:
Pages:
Month:
2009
Article
Nucl. Instr. and Meth. in Physics A
604
1-2
211–214
June
Keywords:
Cellularautomaton, Discrete dynamical systems, Photomultiplier inhomogeneities, Energy filtering

 

Abstract:
Indirect positiondetectorsbased on scintillator crystals lack of spacial uniformity in their response. This happens due to crystal inhomogeneities and gain differences among the photomultiplier anodes. In order to solve this, PESIC, an integrated front-end for multianode photomultiplier based nuclear imaging devices was created. One of its main features is the digitally programmable gain adjustment for every photomultiplier output. On another front, cellularautomata have been proved to be a useful method for dynamic system modeling. In this paper, a cellularautomaton which emulates the behavior of the scintillator crystal, the photomultiplier and the front-end is introduced. Thanks to this model, an automatic energy-based calibration of the detector can be done by configuring the cellularautomaton with experimental data and making it evolve up to an stable state. This can be useful as a precalibration method of the detector.

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