Does vertebroplasty affect radiation dose distribution?: comparison of spatial dose distributions in a cement-injected vertebra as calculated by treatment planning system and actual spatial dose distribution.
Does vertebroplasty affect radiation dose distribution?: comparison of spatial dose distributions in a cement-injected vertebra as calculated by treatment planning system and actual spatial dose distribution.
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DOI：
10.1155/2012/571571
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发表时间：
2012
影响因子：
2.7
通讯作者：
Sawada S
中科院分区：
文献类型：
--
作者：
Komemushi A;Tanigawa N;Kariya S;Yagi R;Nakatani M;Suzuki S;Sano A;Ikeda K;Utsunomiya K;Harima Y;Sawada S
目的.评估放射治疗计划系统（RTPS）计算的注入骨水泥的椎体剂量分布与实际剂量分布的差异。方法.我们准备了两个水当量的幻影水泥，和其他两个幻影没有水泥。将骨水泥的体积密度导入RTPS，以减少高CT值带来的误差。使用RTPS，在临床设置和体积密度输入的情况下，计算有和没有骨水泥的体模的剂量分布图。通过胶片密度测量实际剂量分布。通过RTPS计算的剂量分布与通过膜剂量测定法测量的剂量分布进行比较。结果对于骨水泥体模，骨水泥内部和骨水泥腹侧对应区域的剂量分布失真。然而，基于薄膜剂量测定的剂量分布在骨水泥后面没有失真，并且在骨水泥内部和骨水泥周围观察到剂量增加。使用含有骨水泥的等效体模，RTPS计算的剂量分布与胶片剂量测定法测量的剂量分布之间存在差异。结论使用RTPS计算的含有骨水泥的区域的剂量分布与实际剂量分布不同。
Purpose. To assess differences in dose distribution of a vertebral body injected with bone cement as calculated by radiation treatment planning system (RTPS) and actual dose distribution. Methods. We prepared two water-equivalent phantoms with cement, and the other two phantoms without cement. The bulk density of the bone cement was imported into RTPS to reduce error from high CT values. A dose distribution map for the phantoms with and without cement was calculated using RTPS with clinical setting and with the bulk density importing. Actual dose distribution was measured by the film density. Dose distribution as calculated by RTPS was compared to the dose distribution measured by the film dosimetry. Results. For the phantom with cement, dose distribution was distorted for the areas corresponding to inside the cement and on the ventral side of the cement. However, dose distribution based on film dosimetry was undistorted behind the cement and dose increases were seen inside cement and around the cement. With the equivalent phantom with bone cement, differences were seen between dose distribution calculated by RTPS and that measured by the film dosimetry. Conclusion. The dose distribution of an area containing bone cement calculated using RTPS differs from actual dose distribution.