Suitability study of a synthetic diamond-based detector for the absorbed dose determination in volumetric modulated arc therapy treatments
DOI:
https://doi.org/10.37004/sefm/2021.22.2.002Keywords:
Synthetic diamond, VMAT treatment verifications, standard uncertainty, small field dosimetry, flattening filter and flattening filter-free dosimetryAbstract
In this paper we have examined the characteristics of a synthetic diamond detector (PTW 60019 microDiamond) for dosimetric verifications in volumetric modulated arc therapy (VMAT) treatments. This study has been conducted for three different photon energies, 6 MV with flattening filter and, 6 and 10 MV without flattening filter. We have compared its behaviour with two well-known ionization chambers (PTW 31010 Semiflex and PTW 31016 PinPoint). The microDiamond detector presented a stable response with time, below 0.31% in seven months. Relative standard uncertainty for absorbed dose at the measurement point for VMAT distributions is estimated to be around 3% with a 96.5% confidence level (k = 2.14). The results we obtained for the synthetic diamond show differences with the treatment planning system within the uncertainty in all cases except one, while results from the ionization chambers show differences above 3% in some cases for treatment volumes smaller than 5 cm3 associated with inhomogeneities in the dose distribution. In summary, the microDiamond detector has proven its capability to measure absorbed dose in VMAT treatments with volumes as small as 3 cm3 in photon beams typically used in external beam radiation therapy without presenting significant volume or density effects.
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