Apport des caméras CZT grand champ 2D et 3D dans l’évolution des pratiques cliniques

», Groupe de travail Sfpm « Caméras Czt grand champ; Serre, Denis; Doyeux, Kaya; Rouzic, Gilles Le; Barrau, C.; Hapdey, Sébastien; Tylski, P.; Cassol, Edana; Imbert, Laëtitia

doi:10.1016/j.mednuc.2021.06.135

Cited by 1 publication

(2 citation statements)

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“…However, this preliminary study was to evaluate the intrinsic collimator performances. These intrinsic performances will still have to be evaluate in non-conventional SPECT samplings such as performed in the GE StarGuide (Serre et al 2021) and in the Spectrum-Dynamics VERITON-CT (Desmonts et al 2020) system.…”

Section: Discussionmentioning

confidence: 99%

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Dual-layer collimator for improved spatial resolution in SPECT with CZT camera: an analytical and Monte Carlo study

et al. 2022

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Purpose: Current hole matching pixel detector (HMPD) collimators for SPECT imaging exist in two configurations: one hole per pixel (1HMPD) or four holes per pixel (4HMPD). The aim of this study was to assess the performance of a dual-layer collimator made by stacking up these two collimator types (1H/4HMDP) for low- and medium-energy gamma emitters. Method: Analytical equations describing geometrical efficiency and full width at half maximum (FWHM) of the 1H/4HMDP collimator were derived. In addition, a fast dedicated Monte Carlo (MC) code neglecting scattering and designed for the collimator geometry was developed to assess the collimator’s point spread function (PSF) and to simulate planar and SPECT acquisitions. Results: A relative agreement between analytical equations and MC simulations better than 3% was observed for the efficiency and for the FWHM. The length of the two layers was optimized to get the best spatial resolution while keeping the geometrical efficiency equal to that of the 45mm-length 1HMPD collimator. An optimized combination of the 1H/4HMPD configuration with respective hole lengths of 20mm and 13mm has been derived. For source-collimator distances above 5 cm and equal collimator geometrical efficiency, the spatial resolution of this optimal 1H/4HMDP collimator supersedes that of the 45mm-le-ngth 1HMPD collimator, and that of the 19.1mm-length 4HMPD collimator. This improvement was observed in simulations of bar phantom planar images and of hot rods phantom SPECT. Remarkably, the spatial resolution was preserved along the whole radial range within the Jaszczak phantom. Conclusion: The 1H/4HMDP collimator is a promising solution for CZT SPECT imaging of low- and medium-energy emitters.

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Section: Discussionmentioning

confidence: 99%

“…Spectrum dynamics introduced a new version of 360 degree CZT VERITON-CT system with a four holes matching pixel detector (4HMPD) configuration (Desmonts et al 2020). Recently, the full-ring enclosed system (GE StarGuide) has also been developed with the 4HMPD configuration (Serre et al 2021).…”

Section: Introductionmentioning

confidence: 99%