Simulation of CdZnTe gamma-ray spectrometer response

Glière, Alain; Rosaz, M.; Verger, L.

doi:10.1016/s0168-9002(99)01229-2

Cited by 16 publications

(5 citation statements)

References 7 publications

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“…However, little work has been done when the effect of strong magnetic field (>3T) needs to be considered. In this study, we conducted the simulation of CZT detector response inside a 3T magnetic field based on the models described in [8]. This model takes into account the physical properties of CZT detectors such as carrier mobility and lifetime and also the applied weighting electric field.…”

Section: Spect Subsystem Modelling and Simulationmentioning

confidence: 99%

Development of simulation tools for small animal SPECT/MRI reconstruction study

Chen¹,

Wang²,

Tsui

2007

2007 IEEE Nuclear Science Symposium Conference Record

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The goal of this study is to develop simulation tools for a proposed simultaneous SPECT/MRI system. The proposed SPECT/MRI system is based on a clinical 3T MRI scanner and a ring-type SPECT subsystem using Cadmium Zinc Telluride (CZT) detectors and pinhole or multi-pinhole collimators. Geant4 Applications for Emission Tomography (GATE) was used to simulate the gamma-ray photon transportation process in SPECT Monte-Carlo simulation. Analytical modeling of the electron-hole drifting was used to simulate CZT detector response in the magnetic field. Object-oriented development interface for NMR (ODIN) was introduced to simulate MR imaging sequences. The digital Mouse whole BodY (MOBY) phantom was extended for MRI simulation by specifying the spin-physics properties for each organ in the mouse phantom. The data generated from the above simulation tools was then employed to study how to improve SPECT reconstruction using anatomical information based on MRI images. The noise and lesion contrast properties of reconstructed SPECT images were discussed. We conclude that the simulation tools are useful for investigating how to improve SPECT reconstruction using MRI images in the simultaneous SPECT/MRI imaging systems under construction or investigation.

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Section: Spect Subsystem Modelling and Simulationmentioning

confidence: 99%

Development of simulation tools for small animal SPECT/MRI reconstruction study

Chen¹,

Wang²,

Tsui

2007

2007 IEEE Nuclear Science Symposium Conference Record

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“…Prettyman (1999) implemented the numerical solution of the adjoint electron/hole continuity and Poisson equations to produce a 2D charge induction efficiency (CIE) map to compute the pulse-height spectrum. Finally, Picone et al (2003) used the adjoint equation concept to extend the planar model initially described in Glière et al (2000), to present an accurate method for determining the 3D distribution of charge pulses produced in a semiconductor incorporating models of electronic signal processing and electronic noise. These methods provide an accurate estimation of the induced charge and pulse shape but suffer from a high computational cost as a result of the need for numerically solving several differential equations.…”

Section: Introductionmentioning

confidence: 99%

An investigation of performance characteristics of a pixellated room-temperature semiconductor detector for medical imaging

Guerra¹,

Santos²,

Darambara³

2009

J. Phys. D: Appl. Phys.

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The operation of any semiconductor detector depends on the movement of the charge carriers, which are created within the material when radiation passes through, as a result of energy deposition. The carrier movement in the bulk semiconductor induces charges on the metal electrodes, and therefore a current on the electrodes and the external circuit. The induced charge strongly depends on the material transport parameters as well as the geometrical dimensions of a pixellated semiconductor detector. This work focuses on the performance optimization in terms of energy resolution, detection efficiency and intrinsic spatial resolution of a room-temperature semiconductor pixellated detector based on CdTe/CdZnTe. It analyses and inter-relates these performance figures for various dimensions of CdTe and CdZnTe detectors and for an energy range spanning from x-ray (25 keV) to PET (511 keV) imaging. Monte Carlo simulations, which integrate a detailed and accurate noise model, are carried out to investigate several CdTe/CdZnTe configurations and to determine possible design specifications. Under the considered conditions, the simulations demonstrate the superiority of the CdZnTe over the CdTe in terms of energy resolution and sensitivity in the photopeak. Further, according to the results, the spatial resolution is maximized at high energies and the energy resolution at low energies, while a reasonable detection efficiency is achieved at high energies, with a 1 × 1 × 6 mm 3 CdZnTe pixellated detector.

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“…A number of publications (Hamel and Paquet 1996, Glière et al 2000, Heanue et al 1997, Mathy et al 2004 have in the past dealt with the modelling of charge transport in semiconductor detectors. Early works assumed a uniform electric field, while later works tended to consider more complicated electric field profiles, where numerical techniques become inevitable.…”

Section: Introductionmentioning

confidence: 99%

Development of a simplified simulation model for performance characterization of a pixellated CdZnTe multimodality imaging system

2008

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Current requirements of molecular imaging lead to the complete integration of complementary modalities in a single hybrid imaging system to correlate function and structure. Among the various existing detector technologies, which can be implemented to integrate nuclear modalities (PET and/or single-photon emission computed tomography with x-rays (CT) and most probably with MR, pixellated wide bandgap room temperature semiconductor detectors, such as CdZnTe and/or CdTe, are promising candidates. This paper deals with the development of a simplified simulation model for pixellated semiconductor radiation detectors, as a first step towards the performance characterization of a multimodality imaging system based on CdZnTe. In particular, this work presents a simple computational model, based on a 1D approximate solution of the Schockley-Ramo theorem, and its integration into the Geant4 application for tomographic emission (GATE) platform in order to perform accurately and, therefore, improve the simulations of pixellated detectors in different configurations with a simultaneous cathode and anode pixel readout. The model presented here is successfully validated against an existing detailed finite element simulator, the multi-geometry simulation code, with respect to the charge induced at the anode, taking into consideration interpixel charge sharing and crosstalk, and to the detector charge induction efficiency. As a final point, the model provides estimated energy spectra and time resolution for (57)Co and (18)F sources obtained with the GATE code after the incorporation of the proposed model.

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Simulation of CdZnTe gamma-ray spectrometer response

Cited by 16 publications

References 7 publications

Development of simulation tools for small animal SPECT/MRI reconstruction study

Development of simulation tools for small animal SPECT/MRI reconstruction study

An investigation of performance characteristics of a pixellated room-temperature semiconductor detector for medical imaging

Development of a simplified simulation model for performance characterization of a pixellated CdZnTe multimodality imaging system

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