Synthetic single crystal diamond dosimeters for Intensity Modulated Radiation Therapy applications

Almaviva, S.; Ciancaglioni, I.; Consorti, R.; Notaristefani, F. De; Manfredotti, C.; Marinelli, M.; Petrucci, A.; Prestopino, G.; Verona, C.

doi:10.1016/j.nima.2009.07.004

Cited by 32 publications

(27 citation statements)

References 11 publications

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“…Such detectors have been successfully utilized for the fabrication of high performance Schottky barrier (SB) particle detectors (alpha particles, neutrons) [6], photon detectors (vacuum UV, soft X rays) [1] and radiation therapy dosimeters [7].…”

Section: Diamond Based Multilayered Detectorsmentioning

confidence: 99%

“…Heavy boron incorporation induces metallic conduction in diamond. Boron-doped (Bdoped) diamond has attracted considerable attention for its application in the fabrication process of novel diamond based multilayered Schottky diode detectors for X-ray and ultraviolet radiation [1], alpha particles, thermal and fast neutrons [6] and radiation therapy dosimetry [7]. In this paper, a series of B-doped homoepitaxial diamond films have been analyzed by Raman spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Raman scattering in boron-doped single-crystal diamond used to fabricate Schottky diode detectors

Faggio

Messina

Santangelo

et al. 2012

Journal of Quantitative Spectroscopy and Radiative Transfer

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a b s t r a c tThanks to its exceptional physical and electronic properties, diamond is an attractive material for electronic devices working at high temperature and in harsh chemical environment. Its use as a semiconducting material for electronics is related to the possibility of doping it in order to control its conductivity. Semiconducting p-type diamond films can be grown when boron is introduced into the film. In this work, boron-doped (B-doped) homoepitaxial diamond films are grown by Microwave Plasma Enhanced Chemical Vapor Deposition. Raman and electrical characterizations are carried out on the films as a function of boron doping level. As the boron content increases, we observe systematic modifications in the Raman spectra of single-crystal diamonds. A significant change in the lineshape of the first-order Raman peak, as well as a wide and structured signal at lower wavenumbers, appears simultaneously in samples grown with higher boron content. A single crystal diamond Schottky diode based on a metal/intrinsic/p-type diamond junction is analysed.

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Section: Diamond Based Multilayered Detectorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Raman scattering in boron-doped single-crystal diamond used to fabricate Schottky diode detectors

Faggio

Messina

Santangelo

et al. 2012

Journal of Quantitative Spectroscopy and Radiative Transfer

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“…The behavior of synthetic diamonds for IMRT dosimetry has been analyzed in a few papers. [6][7][8][12][13][14] In particular, in the paper by Almaviva,6 very promising features of a synthetic single crystal diamond detector (SCDD) developed at Roma Tor vergata University are shown. These SCDDs have been tested as radiotherapy dosimeters with different beam qualities (photons from 60 Co to 10 MV and electrons from 6 MeV to 18 MeV).…”

Section: Introductionmentioning

confidence: 99%

A synthetic diamond diode in volumetric modulated arc therapy dosimetry

et al. 2013

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Purpose: The aim of this work is to investigate the behavior of a single crystal diamond diode (SCDD) for volumetric modulated arc therapy (VMAT) dose verifications. This delivery technique is one of the most severe test of a dosimeter performance due to the modulation of the dose rate achieved by simultaneously changing the velocity of the gantry and the position of the collimator leaves. The performed measurements with VMAT photon beams can therefore contribute to an overall global validation of the device to be used in dose distribution verifications. Methods:The SCDD response to 6 MVRX has been tested and compared with reference ionization chambers and treatment planning system (TPS) calculations in different experiments: (a) measurements of output factors for small field sizes (square fields of side ranging between 8 mm and 104 mm) by SCDD and A1SL ionization chamber; (b) angular dependence evaluation of the entire experimental set-up by SCDD, A1SL, and Farmer ionization chambers; and (c) acquisition of dose profiles for a VMAT treatment of a pulmonary disease in latero-lateral and gantry-target directions by SCDD and A1SL ionization chamber. Results: The output factors measured by SCDD favorably compare with the ones obtained by A1SL, whose response is affected by the lack of charged particle equilibrium and by averaging effect when small fields are involved. From the experiment on angular dependence, a good agreement is observed among the diamond diode, the ion chambers, and the TPS. In VMAT profiles, the absorbed doses measured by SCDD and A1SL compare well with the TPS calculated ones. An overall better agreement is observed in the case of the diamond dosimeter, which is also showing a better accuracy in terms of distance to agreement in the high gradient regions. Conclusions: Synthetic diamond diodes, whose performance were previously studied for conformal and IMRT radiotherapy techniques, were found to be suitable detectors also for dosimetric measurements in volumetric arc therapy treatments.

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“…High electronic quality homoepitaxial diamond can be grown on high temperature high pressure (HPHT) diamond substrates by a CVD method, to produce synthetic single crystal CVD diamond films (scCVD) [15]. Recently, it has been demonstrated that dosimeters made with such scCVD diamond films exposed to X-photons are characterised by a fast, reproducible and stable dynamics, making them suitable for IMRT applications [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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

Bruzzi

Angelis

Scaringella

et al. 2011

Diamond and Related Materials

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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.

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Synthetic single crystal diamond dosimeters for Intensity Modulated Radiation Therapy applications

Cited by 32 publications

References 11 publications

Raman scattering in boron-doped single-crystal diamond used to fabricate Schottky diode detectors

Raman scattering in boron-doped single-crystal diamond used to fabricate Schottky diode detectors

A synthetic diamond diode in volumetric modulated arc therapy dosimetry

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

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