Tashiro Mutsumi, Kawashima Motohiro
Gunma University Heavy Ion Medical Center, 3-39-22 Showa-Machi, Maebashi, Gunma 371-8511, Japan.
Phys Imaging Radiat Oncol. 2022 Aug 8;23:140-143. doi: 10.1016/j.phro.2022.08.001. eCollection 2022 Jul.
For carbon-ion beams, radiochromic film response depends on the dose and linear energy transfer (LET). For film dosimetry, we developed an LET-independent simple calibration method for a radiochromic film for specific therapeutic carbon-ion beams. The measured film doses were calibrated with a linear function within 5% error. The penumbra positions of the films were consistent with the differences from the planned ones within ~0.4 mm. The results indicated sufficient accuracy for use as a tool for the confirmation of the penumbra position of the fields.
对于碳离子束，放射变色膜的响应取决于剂量和线能量转移（LET）。对于薄膜剂量测定，我们针对特定治疗用碳离子束开发了一种与LET无关的放射变色膜简单校准方法。测量得到的薄膜剂量通过线性函数进行校准，误差在5%以内。薄膜的半影位置与计划位置的差异在约0.4毫米范围内保持一致。结果表明，该方法具有足够的准确性，可作为确认射野半影位置的工具。
