Zero-bias operation of polycrystalline chemically vapour deposited diamond films for Intensity Modulated Radiation Therapy

被引：23

作者：

Bruzzi, M. ^{[1
]}

De Angelis, C. ^{[2
,3
]}

Scaringella, M. ^{[1
]}

Talamonti, C. ^{[4
,5
]}

Viscomi, D. ^{[2
,3
]}

Bucciolini, M.

机构：

[1] Univ Florence, INFN Firenze & Dip, I-50139 Florence, Italy

[2] Ist Nazl Fis Nucl, I-00161 Rome, Italy

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

[4] Ist Nazl Fis Nucl, I-50134 Florence, Italy

[5] Univ Florence, Dip Fisiopatol Clin, I-50134 Florence, Italy

来源：

关键词：

Polycrystalline Chemical Vapor Deposited; Null-bias operation of pCVD; Dosimeters; IMRT; SINGLE-CRYSTAL; RADIOTHERAPY DOSIMETRY; PROSTATE-CANCER; DETECTORS; TRACKING; PHOTON; BEAMS;

D O I：

10.1016/j.diamond.2010.11.011

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A detailed investigation of the performance as a dosimeter of state-of-art polycrystalline CVD (pCVD) diamond detectors operated in photovoltaic regime for applications in clinical radiotherapy has been carried out with conventional 6-10-18 MV X-photons, as well as with a 10 MV photon Intensity Modulated Radiation Therapy (IMRT) beam from a linear accelerator. Our results show that the performances of a pCVD diamond dosimeter improves dramatically when operated in null-bias conditions. Main improvements with respect to operation with an external voltage applied are: a reduced pre-irradiation dose; an excellent time stability, characterised by standard deviations less than 0.5%; a rise-time comparable to that of commercial reference dosimeters; a linearity with dose proven over three decades; a reduced deviation from linearity of the current vs. dose-rate curve, output factors comparable to that of commercial reference dosimeters. These results represent a significant step towards clinical applications as IMRT with synthetic polycrystalline CVD diamond films. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：84 / 92

页数：9

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