First images from a CeBr<sub>3</sub> /LYSO:Ce Temporal Imaging portable Compton camera at 1.3 MeV

Hmissi, M. Z.; Iltis, Alain; Tata, C.; Zeufack, G.; Rodrigues, Leonardo Brand; Mehadji, Brahim; Morel, C.; Snoussi, Hichem

doi:10.1109/nssmic.2018.8824429

Cited by 4 publications

(4 citation statements)

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“…To obtain real data for performance assessment, we setup an experimental system consisting of a punctual 0.2 (MBq) 22 Na source and a handheld CeBr3 Compton camera developed by Damavan Imaging [18]. We deploy sequentially the camera at three different view-angles as in Fig.…”

Section: A Experiments Setting and Datamentioning

confidence: 99%

“…This extended version shares the same iteration equation form as in the conventional LM-MLEM algorithm, but with different meaning. To assess the performance of the proposed 3D reconstruction algorithm, we setup an experimental system with a punctual 0.2 (MBq) 22 Na source and a handheld CeBr3 Compton camera developed by Damavan Imaging [18] to obtain 1-view, 2-view and 3-view Compton data. Using an extension of the well-known Maxim et al's probabilistic model [19] as the basic camera response matrix and sensitivity, we apply the extended list-mode MLEM to determine the radioactive source location.…”

Section: Introductionmentioning

confidence: 99%

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An Extended List-Mode MLEM Algorithm for 3D Compton Image Reconstruction from Multi-View Data

Le,

Snoussi,

Hmissi

et al. 2023

EPJ Web Conf.

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The lack of parallax in the measurements is a big challenge in 3D image reconstruction for handheld Compton cameras. Our solution to this issue is to extend the conventional list-mode maximum-likelihood expectation-maximization (LM-MLEM) 3D reconstruction algorithm to allow the simultaneous use of multi-view Compton data seeking parallax improvement. It involves building a new list-mode simultaneous data space from multi-view Compton events, formulating the associated probabilistic models for the system response matrix and sensitivity, and developing an extended LM-MLEM algorithm. For the performance assessment, we experiment the extended 3D reconstruction algorithm on real multi-view data conducted with a handheld CeBr3 Compton camera developed by Damavan Imaging and a punctual 0.2 (MBq) 22Na source. Various comparative studies with different view numbers, source locations and energy ranges confirm the outperformances of our extended LM-MLEM algorithm.

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Section: A Experiments Setting and Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Extended List-Mode MLEM Algorithm for 3D Compton Image Reconstruction from Multi-View Data

Le,

Snoussi,

Hmissi

et al. 2023

EPJ Web Conf.

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“…Due to their design without collimation medium, the sensitivity of Compton cameras is greatly increased compared to Anger cameras and allows measurements with a large field of view. Example usages of Compton cameras include nuclear decommissioning [1][2][3], homeland security [4,5], astronomical imaging [6] or medical imaging applications like hadron therapy or single photon emission computed tomography [7][8][9][10][11][12]. Due to these inherently different applications, various sizes and geometries of Compton cameras have been considered, the typical parameters that are considered for optimization in the construction of setups are usually sensitivity (overall or in specific energy ranges), spatial resolution and energy resolution [8,13].…”

Section: Introductionmentioning

confidence: 99%

Multiple scatter correction for single plane Compton camera imaging in nuclear decommissioning

Burger,

Jansen,

Hölzer

et al. 2023

Proc Appl Math and Mech

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This paper focuses on the application of Compton cameras in nuclear decommissioning, aiming to develop efficient and affordable radiological characterization methods. Compton cameras offer advantages over traditional Anger cameras, including increased sensitivity and a larger field of view. We showcase the use of monolithic scintillation detectors in a Compton camera setup to compute two‐dimensional reconstructions of the source location of incident gamma rays. The presence of multiple scattering effects in the large, spatially non‐resolved detectors can lead to spatial artifacts in the reconstructed source activity. To address this, the paper proposes an extended forward model that accounts for double scattering interactions within a single detector element. Experimental and simulation results demonstrate the effectiveness of the proposed approach.

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“…Compton cameras (CCs) are electronically collimated gamma-ray imagers which have found application in domains as diverse as astronomy (Schönfelder et al 1973, 1996, De Angelis et al 2017, Rando 2017 or environmental radiation monitoring, including homeland security, nuclear decommissioning and waste management (Martin et al 1994, Wahl et al 2015, Takeda et al 2015, Montémont et al 2017, Hmissi et al 2018, Sinclair et al 2020. CCs applicability to nuclear medical imaging was soon recognized (Todd et al 1974), and their potential advantages as replacement to conventional gamma cameras for diagnostic purposes is well established in the literature (Singh 1983, Zhang et al 2004, Nurdan et al 2015, Fontana et al 2017.…”

Section: Introductionmentioning

confidence: 99%

Joint image reconstruction algorithm in Compton cameras

et al. 2022

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Objective: To demonstrate the benefits of using an joint image reconstruction algorithm based on the List Mode Maximum Likelihood Expectation Maximization that combines events measured in different channels of information of a Compton camera. Approach: Both simulations and experimental data are employed to show the algorithm performance. Main results: The obtained joint images present improved image quality and yield better estimates of displacements of high energy gamma-ray emitting sources. The algorithm also provides images that are more stable than any individual channel against the noisy convergence that characterizes Maximum Likelihood based algorithms. Significance: The joint reconstruction algorithm can improve the quality and robustness of Compton camera images. It also has high versatility, as it can be easily adapted to any Compton camera geometry. It is thus expected to represent an important step in the optimization of Compton camera imaging.

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First images from a CeBr₃ /LYSO:Ce Temporal Imaging portable Compton camera at 1.3 MeV

Cited by 4 publications

References 4 publications

An Extended List-Mode MLEM Algorithm for 3D Compton Image Reconstruction from Multi-View Data

An Extended List-Mode MLEM Algorithm for 3D Compton Image Reconstruction from Multi-View Data

Multiple scatter correction for single plane Compton camera imaging in nuclear decommissioning

Joint image reconstruction algorithm in Compton cameras

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First images from a CeBr3 /LYSO:Ce Temporal Imaging portable Compton camera at 1.3 MeV

Cited by 4 publications

References 4 publications

An Extended List-Mode MLEM Algorithm for 3D Compton Image Reconstruction from Multi-View Data

An Extended List-Mode MLEM Algorithm for 3D Compton Image Reconstruction from Multi-View Data

Multiple scatter correction for single plane Compton camera imaging in nuclear decommissioning

Joint image reconstruction algorithm in Compton cameras

Contact Info

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First images from a CeBr₃ /LYSO:Ce Temporal Imaging portable Compton camera at 1.3 MeV