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doi:10.11889/j.1000-3436.2015.rrj.33.020202

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更新时间：2021-12-01

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- Journal of Radiation Research and Radiation Processing Vol. 33, Issue 2, Pages: 20202-020202(2015)
- 作者机构：
  
  1. 1（南方医科大学生物医学工程学院）,广州,510515
  2. 2（广东省中医院）,广州,510120
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- DOI：10.11889/j.1000-3436.2015.rrj.33.020202
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[J]. Journal of Radiation Research and Radiation Processing 33(2):20202-020202(2015)
DOI：

[J]. Journal of Radiation Research and Radiation Processing 33(2):20202-020202(2015) DOI： 10.11889/j.1000-3436.2015.rrj.33.020202.

摘要

用电离室测量及蒙特卡罗方法计算水模体中瓦里安6 MV X-射线射野的百分深度剂量和射野离轴比，对测量和计算结果进行比较和分析。结果表明：10 cm × 10 cm射野百分深度剂量在0−20 cm深度范围内，按2 mm / 2%标准，r ≤1的通过率为96.47%，按3 mm / 3%标准，r ≤1的通过率为99.23%；射野离轴比按2 mm / 2%标准，r≤1的通过率为97.56%，按3 mm / 3%标准，r ≤1的通过率为99.42%；10 cm × 10 cm射野深度剂量中的电子线份额为5.3%，40 cm × 40 cm射野深度剂量中的电子线份额为15.2%。通过电离室测量和蒙特卡罗计算的方法能够确定X-射线射野的剂量分布特性。

Abstract

The beam dose distribution is compared with those obtained from Monte Carlo (MC) simulation and measurement to investigate dosimetry characteristics for X-ray fields. The beam data, including percentage depth dose (PDD) and off axis ratio (OAR), were acquired by measurement and MC calculation in water phantom for Varian 6 MV X-ray fields. The results were compared and analyzed. The match result, for PDD of the field of 10 cm × 10 cm, has shown 96.47% agreement for r ≤1 with 2% delta dose and 2 mm DTA for calculated and measured dose distribution at the depth of 0 to 20 cm, and 99.23% for r≤1 with 3% delta dose and 3 mm DTA. The match result of OAR has shown 97.56% agreement for r ≤1 with 2% delta dose and 2 mm DTA for calculated and measured dose distribution, and 99.42% for r ≤1 with 3% delta dose and 3mm DTA. Electron dose is 5.3% of depth dose for 10 cm × 10 cm, and 15.2% for 40 cm × 40 cm. Dose distribution can determined through the measurement and calculation in fields.Cited

关键词

剂量分布蒙特卡罗模拟实验测量

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DOI：10.11889/j.1000-3436.2015.rrj.33.020202

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