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首页> 美国卫生研究院文献>Journal of Applied Clinical Medical Physics >A Monte Carlo and experimental investigation of the dosimetric behavior of low‐ and medium‐perturbation diodes used for entrance in vivo dosimetry in megavoltage photon beams
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A Monte Carlo and experimental investigation of the dosimetric behavior of low‐ and medium‐perturbation diodes used for entrance in vivo dosimetry in megavoltage photon beams

机译：蒙特卡洛（Monte Carlo）和低和中摄动二极管的剂量学行为的实验研究该二极管用于兆伏级光子束的体内入射剂量学

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Full buildup diodes can cause significant dose perturbation if they are used on most or all of radiotherapy fractions. Given the importance of frequent in vivo measurements in complex treatments, using thin buildup (low‐perturbation) diodes instead is gathering interest. However, such diodes are strictly unsuitable for high‐energy photons; therefore, their use requires evaluation and careful measurement of correction factors (CFs). There is little published data on such factors for low‐perturbation diodes, and none on diode characterization for 9 MV X‐rays. We report on MCNP4c Monte Carlo models of low‐perturbation (EDD5) and medium‐perturbation (EDP10) diodes, and a comparison of source‐to‐surface distance, field size, temperature, and orientation CFs for cobalt‐60 and 9 MV beams. Most of the simulation results were within 4% of the measurements. The results suggest against the use of the EDD5 in axial angles beyond ±50° and exceeding the range 0° to + 50° tilt angle at 9 MV. Outside these ranges, although the EDD5 can be used for accurate in vivo dosimetry at 9 MV, its CF variations were found to be 1.5–7.1 times larger than the EDP10 and, therefore, should be applied carefully. Finally, the MCNP diode models are sufficiently reliable tools for independent verification of potentially inaccurate measurements.PACS numbers: 87.10.Rt; 87.50.cm; 87.55.km; 87.56.Fc
机译：如果在大多数或所有放射治疗部位使用全堆积二极管，可能会引起明显的剂量扰动。鉴于在复杂治疗中频繁进行体内测量的重要性，因此使用薄堆积（低扰动）二极管成为人们的关注点。但是，这样的二极管绝对不适合高能光子。因此，使用它们需要评估并仔细测量校正因子（CF）。关于低扰动二极管的这些因素的公开数据很少，而关于9 MV X射线的二极管特性则没有数据。我们报告了低扰动（EDD5）和中扰动（EDP10）二极管的MCNP4c蒙特卡洛模型，并比较了钴60和9 MV光束的源到表面距离，场大小，温度和方向CF 。大多数仿真结果都在测量值的4％之内。结果表明，在9 MV时，在超过±50°的轴向角和超过0°至+ 50°的倾斜角范围内不使用EDD5。在这些范围之外，尽管EDD5可以在9 MV时用于精确的体内剂量测定，但发现CF的变化是EDP10的1.5-7.1倍，因此，应谨慎使用。最后，MCNP二极管模型是足够可靠的工具，可以独立验证可能不准确的测量结果。PACS编号：87.10.Rt； 87.50。厘米; 87.55。公里; 87.56.Fc

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