Compton imaging with the PorGamRays spectrometer

Judson, D. S.; Boston, Andrew; Coleman-Smith, P.J.; Cullen, D. M.; Hardie, A.L.; Harkness, L.J.; Jones, Laurence; Jones, Martin V.; Lazarus, I.; Nolan, P.; Pucknell, V.; Rigby, S. V.; Seller, P.; Scraggs, D.P.; Simpson, John; Slee, M.; Sweeney, A.

doi:10.1016/j.nima.2011.01.152

Cited by 12 publications

(4 citation statements)

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“…A prominent feature of the Compton image shown in figure 6, and of the image slices shown in figure 7 (also figures 8 and 9), is the quadratic nature of the background. Similar background is seen in Compton images constructed from events obtained with different detector arrangements [21], and is merely an effect of the reconstruction methodology defined in [19], wherein random overlap of cone surfaces increases with proximity to the reconstructed source location. A quadratic fit is used for the background simply because it is found, empirically, to provide an accurate representation.…”

Section: Imaging Performancementioning

confidence: 68%

Compton imaging with AGATA and SmartPET for DESPEC

et al. 2011

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DESPEC (DEcay SPECtroscopy) is a spectrometer, currently under construction, which is to be used at the FAIR (Facility for Antiproton and Ion Research) facility at GSI Darmstadt, Germany, as part of the NuSTAR (Nuclear STructure, Astrophysics and Reactions) project. Its goal is to analyse the decay of exotic nuclei produced via the Super-FRS (SUPERconducting FRagment Separator). The optimal configuration of certain elements of the spectrometer, namely a HPGe (High Purity Germanium) tracking array, is still under consideration. Work currently being carried out at the University of Liverpool using a segmented, coaxial HPGe detector (AGATA B009) and a pixelated, planar HPGe detector (SmartPET 1) in a Compton camera configuration aims to inform this process by providing insight into the potential performance of such a configuration. This will determine its suitability for the intended purpose, i.e. Compton reconstruction of gamma rays emitted from exotic nuclei implanted into the DESPEC implantation detector, AIDA (Advanced Implantation Detector Array). Preliminary results from this investigation, along with plans for the future direction of this work, are presented.

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Section: Imaging Performancementioning

confidence: 68%

Compton imaging with AGATA and SmartPET for DESPEC

et al. 2011

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“…In fact the realization of 3D spectrometers by a mosaic of single CZT crystals is not as easy as for the case of bi-dimensional imagers, mainly because to the small dimension of each sensitive unit necessary to guarantee the required spatial resolution and also for the intrinsic difficulty of packaging in 3D sensor units in which each one requires an independent spectroscopic readout electronics chain. A solution is offered by the realization of stack of 2D spectroscopic imagers [12,13]. This configuration, is very appealing for large area detector, but has several drawbacks for application requiring fine spatial resolution in three-dimension and compactness.…”

Section: D Czt Sensor Configurations and Developmentsmentioning

confidence: 99%

https://researchopenworld.com/high-energy-cdznte-3d-detectors-for-spectroscopy-and-polarimetry/#

2019

Nanotechnol Adv Mater Sci

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“…Además del 68 Ga, estos estudios incluyen una evaluación de la incidencia sobre la resolución espacial del 48 V. Este radioisótopo emite dos fotones gamma junto con el positrón (que tras aniquilarse dará lugar, a su vez, a otros dos fotones); al ser usados en equipos PET los fotones adicionales repercuten negativamente en la calidad de la imagen, sin embargo se están investigando sistemas para radiodiagnóstico donde se utilice la información de dichos fotones Compton (Díaz, 2009). En estos sistemas el concepto de cámara Compton (Judson et al, 2011) se incorpora a un sistema PET consiguiendo recopilar más información sobre la localización de la fuente emisora gracias a la detección de un tercer fotón. Las características físicas del 48 V son idóneas para estudiar la viabilidad técnica de este tipo de sistemas; además es posible comparar el rendimiento obtenido frente a un sistema PET convencional, donde sólo se utiliza la información proveniente del positrón emitido.…”

Section: F 68 Ga Y 48 V: Características Y Aplicacionesunclassified

“…La emisión de fotones adicionales, aunque con energías distantes a los 511 keV característicos de la detección PET, tienden a deteriorar la imagen reconstruida. Por otro lado, esta característica le hace candidato para ser usando en técnicas de imagen Compton (Judson et al, 2011) o técnicas que combinen imagen PET y Compton (Díaz, 2009).…”

Section: Introductionunclassified

Aspectos metodológicos para la evaluación de sistemas de tomografía por emisión de positrones empleando técnicas Montecarlo, protocolos estandarizados y diferentes trazadores

Castro¹

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This thesis analyzes the factors affecting the performance evaluation in positron emission tomography (PET) imaging, focusing on preclinical scanners. It explores the possibilities of standard protocols of assessment on the following aspects: their use as tools to validate Monte Carlo simulation programs, their usefulness as a method for comparing scanners and their validity in the study of the effect of alternative radioisotopes on image quality.Initially we study the methods of performance evaluation oriented to validate PET simulations. For this we present the GAMOS program as a simulation framework and show the results of its validation based on the standard NEMA NU 4-2008 for preclinical PET scanners. This has been accomplished by comparing simulated results against experimental acquisitions in the ClearPET scanner, describing the methodology for the evaluation and selection of NEMA parameters. This section also mentions the contributions developed in GAMOS for PET applications, such as the inclusion of tools for image reconstruction. Furthermore, the evaluation of the ClearPET scanner is used to compare its performance against another preclinical scanner, specifically the rPET-1 system. This is the first complete NEMA NU 4 based characterization study of both systems. At the same time we analyze how do the significant design differences of these two systems, especially the size of the axial field of view and the detectors configuration affect their performance characteristics. 68 Ga is one of the unconventional radioisotopes in PET imaging the use of which is currently significantly increasing; however, it presents the disadvantage of the long positron range (distance traveled by the emitted positron before annihilating with an electron). Besides the positron range, additional gamma photon emission is another physical property characteristic of PET radioisotopes that can affect the reconstructed image quality, as it happens to the isotope 48 V. In this thesis we assess these effects through studies of spatial resolution and image quality. Finally, we analyze the scope of the NEMA NU 4-2008 to carry out such studies, adapting it and proposing possible modifications.iii AgradecimientosMe gustaría dar las gracias en primer lugar a los dos directores que han posibilitado el desarrollo y conclusión de esta tesis. A Miguel Embid, por haber confiado en mi hace ya seis

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Compton imaging with the PorGamRays spectrometer

Cited by 12 publications

References 12 publications

Compton imaging with AGATA and SmartPET for DESPEC

Compton imaging with AGATA and SmartPET for DESPEC

https://researchopenworld.com/high-energy-cdznte-3d-detectors-for-spectroscopy-and-polarimetry/#

Aspectos metodológicos para la evaluación de sistemas de tomografía por emisión de positrones empleando técnicas Montecarlo, protocolos estandarizados y diferentes trazadores

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