2D range modulator for high-precision water calorimetry in scanned carbon-ion beams

Physics in Medicine and Biology
Kim Marina HolmSteffen Greilich

Abstract

Ionization chamber-based dosimetry for carbon-ion beams still shows a significantly higher standard uncertainty than high-energy photon dosimetry. This is mainly caused by the high standard uncertainty of the correction factor for beam quality k_Q,Q0 . Due to a lack of experimental data, the given values for k_Q,Q0 are based on theoretical calculations. To reduce this standard uncertainty, k_Q,Q0 factors for different irradiation conditions and ICs are determined experimentally by means of water calorimetry. In this article, we describe the process of creating a suitable irradiation technique and the characterization of the dose distribution for water calorimetry in a spread-out Bragg peak (SOBP) for scanned carbon-ion beams using a 2D range modulator. Here, the aim is to achieve a field homogeneity with a standard deviation of the measured dose values of below 1 % and a scanning time of under two minutes for a reasonable field size and applied dose.

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Citations

Jul 28, 2020·Zeitschrift für medizinische Physik·Yuri SimeonovKlemens Zink
Jun 20, 2021·Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)·Kim Marina HolmOliver Jäkel
Jun 22, 2021·Physics in Medicine and Biology·Kim Marina HolmAchim Krauss
Aug 4, 2021·International Journal of Radiation Oncology, Biology, Physics·Thomas TessonnierIvana Dokic

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