Design Study of the Absorber Detector of a Compton Camera for On-Line Control in Ion Beam Therapy

被引：22

作者：

Richard, M. -H. ^{[1
,2
,3
]}

Dahoumane, M. ^{[1
,2
]}

Dauvergne, D. ^{[1
,2
]}

De Rydt, M. ^{[1
,2
,4
]}

Dedes, G. ^{[1
,2
]}

Freud, N. ^{[3
]}

Krimmer, J. ^{[1
,2
]}

Letang, J. M. ^{[3
]}

Lojacono, X. ^{[3
]}

Maxim, V. ^{[3
]}

Montarou, G. ^{[5
]}

Ray, C. ^{[1
,2
]}

Roellinghoff, F. ^{[3
]}

Testa, E. ^{[1
,2
]}

Walenta, A. H. ^{[1
,2
]}

机构：

[1] Univ Lyon, F-69622 Lyon, France

[2] Univ Lyon 1, CNRS, IN2P3, UMR 5822,IPNL, F-69622 Villeurbanne, France

[3] Univ Lyon 1, INSA Lyon, INSERM U1044, CREATIS,CNRS UMR 5220,Ctr Leon Berard, F-69622 Villeurbanne, France

[4] Katholieke Univ Leuven, Inst Kern En Stralingsfys, B-3001 Louvain, Belgium

[5] Clermont Univ, CNRS, IN2P3, UMR 6533,LPC Clermont, F-63177 Aubiere, France

来源：

IEEE TRANSACTIONS ON NUCLEAR SCIENCE | 2012年 / 59卷 / 05期

关键词：

BGO; Compton camera; Geant4; hadrontherapy; ion beam therapy; LaBr3; LYSO; NaI; prompt gamma-ray; PROTON THERAPY; GAMMA; SIMULATION;

D O I：

10.1109/TNS.2012.2206053

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The goal of this study is to tune the design of the absorber detector of a Compton camera for prompt gamma-ray imaging during ion beam therapy. The response of the Compton camera to a photon point source with a realistic energy spectrum (corresponding to the prompt gamma-ray spectrum emitted during the carbon irradiation of a water phantom) is studied by means of Geant4 simulations. Our Compton camera consists of a stack of 2 mm thick silicon strip detectors as a scatter detector and of a scintillator plate as an absorber detector. Four scintillators are considered: LYSO, NaI, LaBr3 and BGO. LYSO and BGO appear as the most suitable materials, due to their high photo-electric cross-sections, which leads to a high percentage of fully absorbed photons. Depth-of-interaction measurements are shown to have limited influence on the spatial resolution of the camera. In our case, the thickness which gives the best compromise between a high percentage of photons that are fully absorbed and a low parallax error is about 4 cm for the LYSO detector and 4.5 cm for the BGO detector. The influence of the width of the absorber detector on the spatial resolution is not very pronounced as long as it is lower than 30 cm.

引用

页码：1850 / 1855

页数：6

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