Evaluation of the scatter doses in the direction of the buccal mucosa from dental metals
Evaluation of the scatter doses in the direction of the buccal mucosa from dental metals
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DOI：
10.1120/jacmp.v16i3.5374
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发表时间：
2015-01-01
影响因子：
2.1
通讯作者：
Tetradis, Sotirios
中科院分区：
文献类型：
--
作者：
Shimamoto, Hiroaki;Sumida, Iori;Tetradis, Sotirios
牙科金属的存在会在头部和颈部区域的放射治疗期间由于散射辐射而产生辐射剂量扰动。本研究的目的是比较在头颈部放射治疗过程中，单野技术、三维适形放射治疗（3D CRT）和调强放射治疗（IMRT）在颊粘膜方向上由各种牙科金属引起的散射剂量。我们使用了9个边长为10 mm的金属立方体，将其放置在水模体内。使用辐射变色胶片测量从立方体在颊粘膜方向上的散射剂量。将膜垂直于立方体的表面放置。对于所有技术，通过线性加速器用4 MV光子能量照射体模。在单场技术中，来自牙科金属的散射剂量显示出3.7%-19.3%的剂量增加，并且金显示出最大的剂量增加。在3D CRT中，牙科金属的散射剂量显示出1.4%-6.9%的剂量增加，这在测量不确定度范围内（金除外）。在调强放射治疗中，牙科金属散射剂量仅增加1.4%-4.3%，均在测量不确定度范围内。在头颈部放射治疗过程中，3D CRT或IMRT中受试牙科金属在颊粘膜方向上的散射剂量低于使用单场技术的散射剂量。然而，在3D CRT和IMRT中，除了金之外，在颊粘膜方向上由特定牙科金属引起的散射剂量之间没有差异。
The presence of dental metals creates radiation dose perturbation due to scattered radiation during radiation therapy for the head and neck region. The purpose of our study was to compare the scatter doses resulting from various dental metals in the direction of the buccal mucosa among a single-field technique, three-dimensional conformal radiation therapy (3D CRT), and intensity-modulated radiation therapy (IMRT) during radiation therapy for the head and neck region. We used nine metal cubes with 10 mm sides, which were placed inside a water phantom. The scatter doses from the cubes in the direction of the buccal mucosa were measured using radiochromic films. The films were placed perpendicularly to the surface of the cubes. The phantom was irradiated with a 4 MV photon energy by a linear accelerator for all techniques. In the single-field technique, the scatter doses from dental metals showed 3.7%-19.3% dose increases, and gold showed the largest dose increase. In 3D CRT, the scatter doses from dental metals showed 1.4%-6.9% dose increases, which were within the measurement uncertainty (except for gold). In IMRT, the scatter doses from dental metals showed only 1.4%-4.3% dose increases, which were all within the measurement uncertainty. During radiation therapy for the head and neck region, the scatter doses from the tested dental metals in the direction of the buccal mucosa in 3D CRT or IMRT were lower than those using the single-field technique. However, there were no differences between the scatter doses resulting from particular dental metals in the direction of the buccal mucosa in 3D CRT and those in IMRT, except for gold.