Evaluation of list-mode ordered subset expectation maximization image reconstruction for pixelated solid-state compton gamma camera with large number of channels

Kolstein, M.; Lorenzo, G. De; Chmeissani, M.

doi:10.1088/1748-0221/9/04/c04034

Cited by 12 publications

(10 citation statements)

References 16 publications

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“…Since it is more likely a neutron originates from the more intense BeRP ball, the image will converge more on that source. If the sources had the same neutron emission rate and spectrum, then the sources would converge with the same intensity 31,32 . Nevertheless, we were still able to resolve and image the two sources.…”

Section: Discussionmentioning

confidence: 99%

Imaging Special Nuclear Material using a Handheld Dual Particle Imager

Steinberger

Ruch

Giha

et al. 2020

Sci Rep

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A compact radiation imaging system capable of detecting, localizing, and characterizing special nuclear material (e.g. highly-enriched uranium, plutonium…) would be useful for national security missions involving inspection, emergency response, or war-fighters. Previously-designed radiation imaging systems have been large and bulky with significant portions of volume occupied by photomultiplier tubes (pMts). the prototype imaging system presented here uses silicon photomultipliers (SipMs) in place of pMts because SipMs are much more compact and operate at low power and voltage. the SipMs are coupled to the ends of eight stilbene organic scintillators, which have an overall volume of 5.74 × 5.74 × 7.11 cm 3. the prototype dual-particle imager's capabilities were evaluated by performing measurements with a 252 Cf source, a sphere of 4.5 kg of alpha-phase weapons-grade plutonium known as the BeRP ball, a 6 kg sphere of neptunium, and a canister of 3.4 kg of plutonium oxide (7% 240 Pu and 93% 239 Pu). these measurements demonstrate neutron spectroscopic capabilities, a neutron image resolution for a Watt spectrum of 9.65 ± 0.94° in the azimuthal direction and 22.59 ± 5.81° in the altitude direction, imaging of gamma rays using organic scintillators, and imaging of multiple sources in the same field of view.

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Section: Discussionmentioning

confidence: 99%

Imaging Special Nuclear Material using a Handheld Dual Particle Imager

Steinberger

Ruch

Giha

et al. 2020

Sci Rep

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“…An implementation of a more sophisticated image reconstruction algorithm (e.g. LM-OSEM) for more complex image phantoms, is presented in [20].…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Compton gamma camera prototype based on pixelated CdTe detectors

Calderon¹,

Chmeissani²,

Kolstein³

et al. 2014

J. Inst.

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A proposed Compton camera prototype based on pixelated CdTe is simulated and evaluated in order to establish its feasibility and expected performance in real laboratory tests. The system is based on module units containing a 2×4 array of square CdTe detectors of 10×10 mm area and 2 mm thickness. The detectors are pixelated and stacked forming a 3D detector with voxel sizes of 2 × 1 × 2 mm. The camera performance is simulated with Geant4-based Architecture for Medicine-Oriented Simulations(GAMOS) and the Origin Ensemble(OE) algorithm is used for the image reconstruction. The simulation shows that the camera can operate with up to 10 Bq source activities with equal efficiency and is completely saturated at 10 Bq. The efficiency of the system is evaluated using a simulated point source phantom in the center of the Field-of-View (FOV) achieving an intrinsic efficiency of 0.4 counts per second per kilobecquerel. The spatial resolution measured from the point spread function (PSF) shows a FWHM of 1.5 mm along the direction perpendicular to the scatterer, making it possible to distinguish two points at 3 mm separation with a peak-to-valley ratio of 8.

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“…where t ik is the transition probability for event i to have originated from FOV bin k, M FOV i is the number of bins in the FOV that are intersected by the cone of event i, and s j is the sensitivity for FOV bin j (i.e., the probability for this bin to produce a detected event). In the most straightforward implementations, the transition probability can be set to 1 [11].…”

Section: Methodsmentioning

confidence: 99%

Using triple gamma coincidences with a pixelated semiconductor Compton-PET scanner: a simulation study

Kolstein¹,

Chmeissani²

2016

J. Inst.

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The Voxel Imaging PET (VIP) Pathfinder project presents a novel design using pixelated semiconductor detectors for nuclear medicine applications to achieve the intrinsic image quality limits set by physics. The conceptual design can be extended to a Compton gamma camera. The use of a pixelated CdTe detector with voxel sizes of 1 × 1 × 2 mm 3 guarantees optimal energy and spatial resolution. However, the limited time resolution of semiconductor detectors makes it impossible to use Time Of Flight (TOF) with VIP PET. TOF is used in order to improve the signal to noise ratio (SNR) by using only the most probable portion of the Line-Of-Response (LOR) instead of its entire length. To overcome the limitation of CdTe time resolution, we present in this article a simulation study using β + -γ emitting isotopes with a Compton-PET scanner. When the β + annihilates with an electron it produces two gammas which produce a LOR in the PET scanner, while the additional gamma, when scattered in the scatter detector, provides a Compton cone that intersects with the aforementioned LOR. The intersection indicates, within a few mm of uncertainty along the LOR, the origin of the beta-gamma decay. Hence, one can limit the part of the LOR used by the image reconstruction algorithm.

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Evaluation of list-mode ordered subset expectation maximization image reconstruction for pixelated solid-state compton gamma camera with large number of channels

Cited by 12 publications

References 16 publications

Imaging Special Nuclear Material using a Handheld Dual Particle Imager

Imaging Special Nuclear Material using a Handheld Dual Particle Imager

Evaluation of Compton gamma camera prototype based on pixelated CdTe detectors

Using triple gamma coincidences with a pixelated semiconductor Compton-PET scanner: a simulation study

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