CZT pixel detectors for improved SPECT imaging

Montémont, G.; Bordy, T.; Rebuffel, V.; Robert, Charlotte; Verger, L.

doi:10.1109/nssmic.2008.4775130

Cited by 9 publications

(9 citation statements)

References 18 publications

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“…This deconvolution is feasible, thanks to the accurate 3D positioning of the photon interactions inside the CZT detector obtained using biparametric spectra 21,24 and barycentric calculation. 25,[27][28][29] Barycentric calculation, which uses the signal of the adjacent anodes to locate the x and y positions inside the physical detector pixel ͑electrode͒, does not increase the number of read-out channels. Figures 1 and 2 illustrate how the resampling ͑fine pixelization of the CZT detector and DOI information͒ reduces the backprojection cones compared to a conventional architecture.…”

Section: Background: Hisens Architecture Descriptionmentioning

confidence: 99%

“…5͑b͔͒ using a small field-of-view CZT gamma imager. 25 The camera was mechanically translated to acquire all the projections. The detector was 5 mm thick and had 4 ϫ 4 physical pixels ͑1.6 mm pixel size͒.…”

Section: Iiie Experimental Studymentioning

confidence: 99%

“…23 This architecture is based on pixelated CZT detectors, 24 like the CZT prototypes mentioned above, and is also characterized by a large aperture collimator to improve system sensitivity. Moreover, a dedicated electronics accurately locates photon-detector interactions 25 by retrieving the depth-of-interaction ͑DOI͒ information and by using a CZT detector sampling less than the electrode size. Such accurate positioning of the detected photons yields a high spatial resolution despite the use of a high sensitivity collimator.…”

Section: Introductionmentioning

confidence: 99%

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Optimization of a parallel hole collimator/CdZnTe gamma‐camera architecture for scintimammography

et al. 2011

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Section: Background: Hisens Architecture Descriptionmentioning

confidence: 99%

Section: Iiie Experimental Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optimization of a parallel hole collimator/CdZnTe gamma‐camera architecture for scintimammography

et al. 2011

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“…For experimental validation purpose, MINIGAMI [15], a small field gamma imager based on a 4 x 4 pixel ell detector, was used (Fig. 11).…”

Section: A Imaging Bench Descriptionmentioning

confidence: 99%

Simulation-based and experimental evaluation of HiSens, a new CdZnTe gamma-camera architecture

Robert

Montémont

Rebuffel

et al. 2008

2008 IEEE Nuclear Science Symposium Conference Record

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The performances of standard gamma-cameras are limited by the well-known trade-off between spatial resolution and sensitivity resulting from the collimator. To overcome this limitation, we have previously proposed a new approach named HiSens, which consists in the association of a pixelated CZT detector, new collimation geometry and dedicated reconstruction algorithms. Two maj or characteristics of the CZT detector are taken advantage of in this architecture: the availability of the depth of interaction (DOl) information and the fine pixelization.In this paper, we consider a configuration using a high sensitivity collimator: the septa height· of the collimator is reduced to ensure a gain in efficiency by a factor of five compared with the Anger Camera (10-4 efficiency). Using DOl information, CZT detector is divided in several virtual layers providing distinct images, which can be combined within a dedicated OSEM reconstruction scheme. Moreover, two possible pixelizations of the CZT detector are studied: one and four pixels per collimator hole. The ultimate aim of this study is to increase the global system efficiency while preserving the spatial resol ution.A complete evaluation of the performance of this architecture has been performed, based on a simple analytical model, on Monte Carlo simulations of the system, and on experimental data.Simulation results show that CZT detector over-pixelization improves the contrast without introducing additional noise. They are confirmed by the experimental validation: contribution of the detector over-pixelization is crucial for improved image quality.

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“…CdZnTe has also been used as the detector of choice in studies for dedicated breast or small field-of-view PET or SPECT imaging [5], [6].…”

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confidence: 99%

Integrated PET/SPECT system for breast imaging with CdZnTe: Computational assessment

Myronakis

Zvelebil

Darambara

2012

2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC)

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Breast specific gamma-ray imaging is gaining research attention as a mean to improve lesion detectability and patient management. Multimodality imaging is currently a hot topic of research with a gradually increasing number of systems installed in hospitals and new trends such as PET/MR and SPECT/MR. Cadmium Zinc Telluride (CdZnTe) pixelated detectors have the potential to lead in both these trends, allowing the design of flexible systems that can perform PET and SPECTimaging with the same detector material whereas being compact enough to be integrated with current MR systems. In the current study, the computational models of integrated PET/SPECT systems employing pixelated CdZnTe detectors in a stacked arrangement to achieve high detection efficiency were assessed in terms of spatial resolution. In addition to classic collimators for SPECT imaging, the possibility for electronic collimation is also investigated to greatly enhance the flexibility of the system. The models were constructed using a unique and realistic modeling framework that accurately handles charge transport effects in the detector and particle interactions in the system. Current preliminary results for PET imaging suggest that sub-centimeter resolution can be achieved.

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CZT pixel detectors for improved SPECT imaging

Cited by 9 publications

References 18 publications

Optimization of a parallel hole collimator/CdZnTe gamma‐camera architecture for scintimammography

Optimization of a parallel hole collimator/CdZnTe gamma‐camera architecture for scintimammography

Simulation-based and experimental evaluation of HiSens, a new CdZnTe gamma-camera architecture

Integrated PET/SPECT system for breast imaging with CdZnTe: Computational assessment

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