DocumentCode :
1518788
Title :
A physics-based model of pixellated semiconductor gamma camera
Author :
Glière, Alain ; Koenig, Anne ; Mathy, Françoise ; Hugonnard, Patrick
Author_Institution :
LETI, CEA, Centre d´´Etudes Nucleaires, de Grenoble, France
Volume :
48
Issue :
3
fYear :
2001
fDate :
6/1/2001 12:00:00 AM
Firstpage :
620
Lastpage :
624
Abstract :
A solid state CdZnTe gamma camera simulator, taking into account the gamma-ray emission and attenuation in the examined phantom, a geometric collimator model and the CdZnTe semiconductor detector response, has been developed. In a first step, the energy dependent spectrometric response of the planar semiconductor pixels is computed from first physical principles (gamma-ray interaction with the crystal and charge collection in the semiconductor detector), as well as from specific acquisition parameters (front-end electronics signal filtering, pulses classification in a pulse height versus rise time biparametric spectrum and bi-dimensional window based pulses selection). In a second step, the uncollided and once scattered photon fluxes, incident to each gamma camera´s pixel, are computed by the means of ray tracing through the phantom´s CAD model. They are then combined with a geometric collimator model. The energy dependent pixel response is finally used to generate the simulated image. Each component of the model has been compared to experimental data. Finally, a correct qualitative agreement was found between simulated images and measurements performed on a prototype platform
Keywords :
biomedical equipment; cadmium compounds; cameras; gamma-ray detection; modelling; CdZnTe; CdZnTe semiconductor detector response; charge collection; energy dependent pixel response; gamma-ray interaction; geometric collimator model; medical diagnostic imaging; medical instrumentation; nuclear medicine; physics-based model; pixellated semiconductor gamma camera; pulses classification; simulated image; simulated images; Attenuation; Cameras; Collimators; Computational modeling; Gamma ray detection; Gamma ray detectors; Imaging phantoms; Solid modeling; Solid state circuits; Spectroscopy;
fLanguage :
English
Journal_Title :
Nuclear Science, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9499
Type :
jour
DOI :
10.1109/23.940135
Filename :
940135
Link To Document :
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