A synthetic diamond detector as transfer dosimeter for<i>D</i><sub>w</sub>measurements in photon beams with small field sizes

Pimpinella, M.; Ciancaglioni, I.; Consorti, R.; Venanzio, C. Di; Guerra, A.S.; Petrucci, A.; Stravato, A.; Verona-Rinati, G.

doi:10.1088/0026-1394/49/5/s207

Cited by 31 publications

(25 citation statements)

References 7 publications

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“…In particular, the different conditions in terms of geometry and beam quality affect the correction factors both in the volume averaging component and in the material-related one. The perturbations due to the material density of the diamond detector increase with beam quality 34 and thus are expected to be lower in a 60 Co measurement with respect to the literature 6 MV results. Furthermore, the geometrical conditions of the LGKP (i.e., photons hit the detector from almost all directions) may reduce the volume averaging correction factors.…”

Section: Discussionmentioning

confidence: 68%

Evaluation of a synthetic single‐crystal diamond detector for relative dosimetry on the Leksell Gamma Knife Perfexion radiosurgery system

Mancosu¹,

Reggiori²,

Stravato³

et al. 2015

Medical Physics

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Purpose: To evaluate the new commercial PTW-60019 synthetic single-crystal microDiamond detector (PTW, Freiburg, Germany) for relative dosimetry measurements on a clinical Leksell Gamma Knife Perfexion radiosurgery system. Methods: Detector output ratios (DORs) for 4 and 8 mm beams were measured using a micro- Diamond (PTW-60019), a stereotactic unshielded diode [IBA stereotactic field detector (SFD)], a shielded diode (IBA photon field detector), and GafChromic EBT3 films. Both parallel and transversal acquisition directions were considered for PTW-60019 measurements. Measured DORs were compared to the new output factor reference values for Gamma Knife Perfexion (0.814 and 0.900 for 4 and 8 mm, respectively). Profiles in the three directions were also measured for the 4 mm beam to evaluate full width at half maximum (FWHM) and penumbra and to compare them with the corresponding Leksell GammaPlan profiles. Results: FWHM and penumbra for PTW-60019 differed from the calculated values by less than 0.2 and 0.3 mm, for the parallel and transversal acquisitions, respectively. GafChromic films showed FWHM and penumbra within 0.1 mm. The output ratio obtained with the PTW-60019 for the 4 mm field was 1.6% greater in transverse direction compared to the nominal value. Comparable differences up to 0.8% and 1.0% for, respectively, GafChromic films and SFD were found. Conclusions: The microDiamond PTW-60019 is a suitable detector for commissioning and routine use of Gamma Knife with good agreement of both DORs and profiles in the three directions

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Section: Discussionmentioning

confidence: 68%

Evaluation of a synthetic single‐crystal diamond detector for relative dosimetry on the Leksell Gamma Knife Perfexion radiosurgery system

Mancosu¹,

Reggiori²,

Stravato³

et al. 2015

Medical Physics

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“…[32][33][34] In addition, a detailed characterization of SCDDs as absolute dosimeters was performed in the framework of a collaboration with the Italian Metrology Institute (ENEA-INMRI), involving both comparison with primary standards and Monte Carlo simulations. 34 In the present paper a detailed dosimetric characterization of such device is presented under 10 MV photon beam irradiations. Particular care was devoted to the response in small field sizes, in view of its application in advanced radiation therapy techniques.…”

Section: Introductionmentioning

confidence: 99%

Dosimetric characterization of a synthetic single crystal diamond detector in clinical radiation therapy small photon beams

Ciancaglioni¹,

Marinelli²,

Milani³

et al. 2012

Med. Phys.

115

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Purpose:To determine the potentialities of synthetic single crystal diamond Schottky diodes for accurate dose measurements in radiation therapy small photon beams. Methods: The dosimetric properties of a diamond-based detector were assessed by comparison with a reference microionization chamber. The diamond device was operated at zero bias voltage under irradiation with high-energy radiotherapic photon beams. The stability of the detector response and its dose and dose rate dependence were measured. Different square field sizes ranging from 1 × 1 cm 2 to 10 × 10 cm 2 were used during comparative dose distribution measurements by means of percentage depth dose curves (PDDs), lateral beam profiles, and output factors. The angular and temperature dependence of the diamond detector response were also studied.Results: The detector response shows a deviation from linearity of less than ±0.5% in the 0.01-7 Gy range and dose rate dependence below ±0.5% in the 1-6 Gy/min range. PDDs and output factors are in good agreement with those measured by the reference ionization chamber within 1%. No angular dependence is observed by rotating the detector along its axis, while ∼3.5% maximum difference is measured by varying the radiation incidence angle in the polar direction. The temperature dependence was investigated as well and a ±0.2% variation of the detector response is found in the 18-40• C range. Conclusions:The obtained results indicate the investigated synthetic diamond-based detector as a candidate for small field clinical radiation dosimetry in advanced radiation therapy techniques.

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“…[24][25][26] In particular, the suitability of such detectors for the dosimetry of radiation therapy small photon beams has been investigated and very promising results have been pointed out. 26,27 In this work the dosimetric performances of such detectors are evaluated in megavoltage clinical electron beams with energy in the range 6-15 MeV and field size from 6 × 6 to 20 × 20 cm 2 .…”

Section: Introductionmentioning

confidence: 99%

Characterization of a synthetic single crystal diamond Schottky diode for radiotherapy electron beam dosimetry

Venanzio

Marinelli²,

Milani³

et al. 2013

Med. Phys.

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Purpose: To investigate the dosimetric properties of synthetic single crystal diamond based Schottky diodes under irradiation with therapeutic electron beams from linear accelerators. Methods: A single crystal diamond detector was fabricated and tested under 6, 8, 10, 12, and 15 MeV electron beams. The detector performances were evaluated using three types of commercial detectors as reference dosimeters: an Advanced Markus plane parallel ionization chamber, a Semiflex cylindrical ionization chamber, and a p-type silicon detector. Preirradiation, linearity with dose, dose rate dependence, output factors, lateral field profiles, and percentage depth dose profiles were investigated and discussed. Results: During preirradiation the diamond detector signal shows a weak decrease within 0.7% with respect to the plateau value and a final signal stability of 0.1% (1σ ) is observed after about 5 Gy. A good linear behavior of the detector response as a function of the delivered dose is observed with deviations below ±0.3% in the dose range from 0.02 to 10 Gy. In addition, the detector response is dose rate independent, with deviations below 0.3% in the investigated dose rate range from 0.17 to 5.45 Gy/min. Percentage depth dose curves obtained from the diamond detector are in good agreement with the ones from the reference dosimeters. Lateral beam profile measurements show an overall good agreement among detectors, taking into account their respective geometrical features. The spatial resolution of solid state detectors is confirmed to be better than that of ionization chambers, being the one from the diamond detector comparable to that of the silicon diode. A good agreement within experimental uncertainties was also found in terms of output factor measurements between the diamond detector and reference dosimeters. Conclusions: The observed dosimetric properties indicate that the tested diamond detector is a suitable candidate for clinical electron beam dosimetry.

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A synthetic diamond detector as transfer dosimeter forD_wmeasurements in photon beams with small field sizes

Cited by 31 publications

References 7 publications

Evaluation of a synthetic single‐crystal diamond detector for relative dosimetry on the Leksell Gamma Knife Perfexion radiosurgery system

Evaluation of a synthetic single‐crystal diamond detector for relative dosimetry on the Leksell Gamma Knife Perfexion radiosurgery system

Dosimetric characterization of a synthetic single crystal diamond detector in clinical radiation therapy small photon beams

Characterization of a synthetic single crystal diamond Schottky diode for radiotherapy electron beam dosimetry

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A synthetic diamond detector as transfer dosimeter forDwmeasurements in photon beams with small field sizes

Cited by 31 publications

References 7 publications

Evaluation of a synthetic single‐crystal diamond detector for relative dosimetry on the Leksell Gamma Knife Perfexion radiosurgery system

Evaluation of a synthetic single‐crystal diamond detector for relative dosimetry on the Leksell Gamma Knife Perfexion radiosurgery system

Dosimetric characterization of a synthetic single crystal diamond detector in clinical radiation therapy small photon beams

Characterization of a synthetic single crystal diamond Schottky diode for radiotherapy electron beam dosimetry

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A synthetic diamond detector as transfer dosimeter forD_wmeasurements in photon beams with small field sizes