An evaluation of a novel synthetic diamond probe for dosimetric applications

Ade, Nicholas; Nam, T.L.

doi:10.1016/j.radphyschem.2015.06.013

Cited by 4 publications

(4 citation statements)

References 42 publications

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“…The group of Università di Roma Tor Vergata has developed a synthetic diamond detector (Almaviva et al 2008(Almaviva et al , 2010, which is commercialized by PTW and has been widely tested and characterized in clinical conditions (Ciancaglioni et al 2012, Lechner et al 2013, Di Venanzio et al 2013, Mandapaka et al 2013, Zani et al 2013, Laub and Crilly 2014, Ralston et al 2014, Morales et al 2014, Lárraga-Gutiérrez et al 2015, Mancosu et al 2015. The good performances offered by synthetic diamond detectors have triggered the interest in this technology (Marsolat et al 2013, Marinelli et al 2015, Ade and Nam 2015b.…”

Section: Introductionmentioning

confidence: 99%

Dose rate dependence of the PTW 60019 microDiamond detector in high dose-per-pulse pulsed beams

et al. 2015

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Recombination effects can affect the detectors used for the dosimetry of radiotherapy fields. They are important when using ionization chambers, especially in liquid-filled ionization chambers, and should be corrected for. The introduction of flattening-filter-free accelerators increases the typical dose-per-pulse used in radiotherapy beams, which leads to more important recombination effects. Diamond detectors provide a good solution for the dosimetry and quality assurance of small radiotherapy fields, due to their low energy dependence and small volume. The group of Università di Roma Tor Vergata has developed a synthetic diamond detector, which is commercialized by PTW as microDiamond detector type 60019. In this work we present an experimental characterization of the collection efficiency of the microDiamond detector, focusing on high dose-per-pulse FFF beams. The collection efficiency decreases with dose-per-pulse, down to 0.978 at 2.2 mGy/pulse, following a Fowler-Attix-like curve. On the other hand, we have found no significant dependence of the collection efficiency on the pulse repetition frequency (or pulse period).

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Section: Introductionmentioning

confidence: 99%

Dose rate dependence of the PTW 60019 microDiamond detector in high dose-per-pulse pulsed beams

et al. 2015

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“…Diamond detector response is read out through different standard and dedicated systems divided into two large groups: single channel and multichannel readout electronics. Usually, for the single output detectors, electrical connections to external electronics are carried out through the use of standard triaxial connectors and the measurements of the current are performed with Keithley electrometers(s), which also serve as the power supply to apply the appropriate polarization between the electric contacts [61,63,86,87]. The signal of the commercial diamond dosimeter SCCD-PTW can be read out with any electrometers available in a Radiotherapy unit.…”

Section: Detector Readoutmentioning

confidence: 99%

“…Detectors with metallic shielding overestimate of values [62], therefore, choosing the right material for diamond housing is of crucial importance. The most commonly used housings for diamond dosimeters are cylindrical or tubular [61,63,64], but rectangular shape holders are also used [86]. The holders are made of different water equivalent materials like, but not limited to, Perspex, PMMA, and Solid Water GAMMEX 457 etc.…”

Section: Detector Housingmentioning

confidence: 99%

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Diamond Detectors for Radiotherapy X-Ray Small Beam Dosimetry

et al. 2021

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Many new X-Ray treatment machines using small and/or non-standard radiation fields, e.g., Tomotherapy, Cyber-knife, and linear accelerators equipped with high-resolution multi-leaf collimators and on-board imaging system, have been introduced in the radiotherapy clinical routine within the last few years. The introduction of these new treatment modalities has led to the development of high conformal radiotherapy treatment techniques like Intensity Modulated photon Radiation Therapy, Volumetric Modulated Arc Therapy, and stereotactic radiotherapy. When using these treatment techniques, patients are exposed to non-uniform radiation fields, high dose gradients, time and space variation of dose rates, and beam energy spectrum. This makes reaching the required degree of accuracy in clinical dosimetry even more demanding. Continuing to use standard field procedures and detectors in fields smaller than 3 × 3 cm2, will generate a reduced accuracy of clinical dosimetry, running the risk to overshadowing the progress made so far in radiotherapy applications. These dosimetric issues represent a new challenge for medical physicists. To choose the most appropriate detector for small field dosimetry, different features must be considered. Short- and long-term stability, linear response to the absorbed dose and dose rate, no energy and angular dependence, are all needed but not sufficient. The two most sought-after attributes for small field dosimetry are water equivalence and small highly sensitive (high sensitivity) volumes. Both these requirements aim at minimizing perturbations of charged particle fluence approaching the Charged Particle Equilibrium condition as much as possible, while maintaining high spatial resolution by reducing the averaging effect for non-uniform radiation fields. A compromise between different features is necessary because no dosimeter currently fulfills all requirements, but diamond properties seem promising and could lead to a marked improvement. Diamonds have long been used as materials for dosimeters, but natural diamonds were only first used for medical applications in the 80 s. The availability of reproducible synthetic diamonds at a lower cost compared to natural ones made the diffusion of diamonds in dosimetry possible. This paper aims to review the use of synthetic poly and single-crystal diamond dosimeters in radiotherapy, focusing on their performance under MegaVoltage photon beams. Both commercial and prototype diamond dosimeters behaviour are described and analyzed. Moreover, this paper will report the main related results in literature, considering diamond development issues like growth modalities, electrical contacts, packaging, readout electronics, and how do they affect all the dosimetric parameters of interest such as signal linearity, energy dependence, dose-rate dependence, reproducibility, rise and decay times.

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An investigation of the role of defect levels on the radiation response of synthetic diamond crystals when used as sensors for the detection of mammography X-rays

Ade

2017

Applied Radiation and Isotopes

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An evaluation of a novel synthetic diamond probe for dosimetric applications

Cited by 4 publications

References 42 publications

Dose rate dependence of the PTW 60019 microDiamond detector in high dose-per-pulse pulsed beams

Dose rate dependence of the PTW 60019 microDiamond detector in high dose-per-pulse pulsed beams

Diamond Detectors for Radiotherapy X-Ray Small Beam Dosimetry

An investigation of the role of defect levels on the radiation response of synthetic diamond crystals when used as sensors for the detection of mammography X-rays

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