Small field output factors evaluation with a microDiamond detector over 30 Italian centers

Serenella Russo, Giacomo Reggiori, Elisabetta Cagni, Stefania Clemente, Marco Esposito, Maria Daniela Falco, Christian Fiandra, Francesca Romana Giglioli, Marco Marinelli, Carmelo Marino, Laura Masi, Maria Pimpinella, Michele Stasi, Lidia Strigari, Cinzia Talamonti, Elena Villaggi, Pietro Mancosu

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Abstract

Purpose The aim of the study was a multicenter evaluation of MLC&jaws-defined small field output factors (OF) for different linear accelerator manufacturers and for different beam energies using the latest synthetic single crystal diamond detector commercially available. The feasibility of providing an experimental OF data set, useful for on-site measurements validation, was also evaluated. Methods This work was performed in the framework of the Italian Association of Medical Physics (AIFM) SBRT working group. The project was subdivided in two phases: in the first phase each center measured OFs using their own routine detector for nominal field sizes ranging from 10 × 10 cm2to 0.6 × 0.6 cm2. In the second phase, the measurements were repeated in all centers using the PTW 60019 microDiamond detector. Results The project enrolled 30 Italian centers. Micro-ion chambers and silicon diodes were used for OF measurements in 24 and 6 centers respectively. Gafchromic films and TLDs were used for very small field OFs in 3 and 1 centers. Regarding the measurements performed with the user's detectors, OF standard deviations (SD) for field sizes down to 2 × 2 cm2were in all cases <2.7%. In the second phase, a reduction of around 50% of the SD was obtained using the microDiamond detector. Conclusions The measured values presented in this multicenter study provide a consistent dataset for OFs that could be a useful tool for improving dosimetric procedures in centers. The microDiamond data present a small variation among the centers confirming that this detector can contribute to improve overall accuracy in radiotherapy.
Original languageEnglish
Pages (from-to)1644 - 1650
Number of pages7
JournalPhysica Medica
Volume32
Issue number12
DOIs
Publication statusPublished - 1 Dec 2016
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Biophysics
  • Radiology Nuclear Medicine and imaging
  • Physics and Astronomy(all)

Cite this

Russo, S., Reggiori, G., Cagni, E., Clemente, S., Esposito, M., Falco, M. D., ... Mancosu, P. (2016). Small field output factors evaluation with a microDiamond detector over 30 Italian centers. Physica Medica, 32(12), 1644 - 1650. https://doi.org/10.1016/j.ejmp.2016.10.017