Dosimetric distribution of the surroundings of different dental crowns and implants during LINAC photon irradiation
Dosimetric distribution of the surroundings of different dental crowns and implants during LINAC photon irradiation
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DOI：
10.1016/j.radphyschem.2013.11.026
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发表时间：
2014-11-01
影响因子：
2.9
通讯作者：
Chie, Yu-Huang
中科院分区：
文献类型：
--
作者：
Chang, Kwo-Ping;Lin, Wei-Ting;Chie, Yu-Huang
在头颈部的放射治疗中，金属假牙或植入物会增加并发症的风险，如粘膜炎和放射性骨坏死。本研究的目的是探讨市售牙科金属合金在6 MV LINAC照射下对粘膜和骨的后向散射效应。采用蒙特卡罗方法计算了基于口腔几何形状的口腔模体在非均匀介质中的剂量分布，后向散射剂量最大增加53%，主要取决于金属冠合金的物理密度和电子密度。陶瓷金属冠已被量化，以增加背散射剂量高达10%的粘膜。陶瓷作为粘膜的固有屏障。如果肿瘤位于较深的区域，则小射野尺寸的后向散射剂量将较大。钛植入物将使骨的反向散射剂量增加13%，但不会影响粘膜。推荐使用QC-20（聚苯乙烯树脂）作为屏蔽材料（3 mm），以消除由于高密度金属而对粘膜产生的反向散射剂量。(C)2013爱思唯尔有限公司保留所有权利。
In radiotherapy of the head and neck, metal dentures or implants will increase the risk of complications such as mucositis and osteoradionecrosis. The aim of this study is to explore the back scatter effect of commercially available dental metal alloys on the mucosa and bone under 6 MV LINAC irradiation. The Monte Carlo method has been employed to calculate the dose distribution in the heterogeneous media of the designed oral phantom based on the oral cavity geometry.Backscatter dose increases up to a maximum of 53%, and is primarily dependent on the physical density and electron density of the metal crown alloy. Ceramic metal crowns have been quantified to increase backscatter dose up to 10% on mucosa. Ceramic serves as an inherent shield of mucosa. The backscatter dose will be greater for a small field size if the tumor is located at a deeper region. Titanium implants will increase the backscatter dose by 13% to bone but will not affect the mucosa. QC-20 (polystyrene resin) is recommended as a shield material (3 mm) to eliminate the backscatter dose on mucosa due to the high density metals. (C) 2013 Elsevier Ltd. All rights reserved.