Present limitations of CVD diamond detectors for IMRT applications

被引：24

作者：

De Angelis, C. ^{[1
]}

Casati, M. ^{[2
]}

Bruzzi, M. ^{[3
]}

Onori, S. ^{[1
]}

Bucciolini, M. ^{[2
]}

机构：

[1] Ist Super Sanita, INFN, Dipartimento Tecnol & Salute, I-00161 Rome, Italy

[2] Univ Florence, INFN, Dipartimento Fisiopatol, I-50121 Florence, Italy

[3] Univ Florence, INFN, Dipartimento Engn, I-50121 Florence, Italy

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2007年 / 583卷 / 01期

关键词：

CVD diamond detector; solid-state dosimetry; IMRT dosimetry;

D O I：

10.1016/j.nima.2007.08.186

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The aim of the work was to test the suitability of chemical vapor deposited (CVD) diamond detectors for dosimetry in IMRT fields. We used in-house CVD detectors prepared with state-of-the-art polycrystalline diamond films (Element Six Ltd., UK). The parameters considered were time stability, dynamic response, dose-rate dependence and energy dependence. Output factors and TPR were measured in conventional photon fields and dose measurements were performed in IMRT fields using the step-and-shoot technique. Results prove that CVD diamond detectors are suitable for dosimetry in conventional treatments, but they still do not fit the IMRT dosimetry requirements, mainly because of their slow dynamic response. In particular, the slow dynamics affects linearity at low Monitor Units and renders it impossible to follow the sharp transients of IMRT fields. Time stability and dose-rate dependence as well must be improved to reduce their influence on dose assessment. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：195 / 203

页数：9

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