[1]王广善,张同梅,邢彦,等.一种新型测量瓦里安碳纤维Exact IGRT Couch HU值的方法及临床应用[J].中国医学物理学杂志,2025,42(9):1130-1135.[doi:DOI:10.3969/j.issn.1005-202X.2025.09.002]
　WANG Guangshan,ZHANG Tongmei,XING Yan,et al.A novel method of measuring the HU value of Varian carbon fiber Exact IGRT Couch and its clinical application[J].Chinese Journal of Medical Physics,2025,42(9):1130-1135.[doi:DOI:10.3969/j.issn.1005-202X.2025.09.002]
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一种新型测量瓦里安碳纤维Exact IGRT Couch HU值的方法及临床应用()
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《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]

卷:
42
期数:
2025年第9期
页码:
1130-1135
栏目:
医学放射物理
出版日期:
2025-09-30

文章信息/Info

Title:
A novel method of measuring the HU value of Varian carbon fiber Exact IGRT Couch and its clinical application
文章编号:
1005-202X（2025）09-1130-06
作者:
王广善1; 张同梅1; 邢彦1; 牛亦婷1; 金见悦2
1.首都医科大学附属北京胸科医院放射治疗科， 北京 101149； 2.首都医科大学生物医学工程学院， 北京 101149
Author(s):
WANG Guangshan1;  ZHANG Tongmei1;  XING Yan1;  NIU Yiting1;  JIN Jianyue2
1.Department of Radiotherapy,Beijing Chest Hospital, Capital Medical University, Beijing 101149, China 2.School of Biomedical Engineering, Capital Medical University, Beijing 101149, China
关键词:
Exact IGRT Couch; 治疗床; 衰减; HU值; 床模型
Keywords:
Keywords: Exact IGRT Couch treatmen tcouch attenuation Hounsfield Unit value couch model
分类号:
R318；R811.1
DOI:
DOI:10.3969/j.issn.1005-202X.2025.09.002
文献标志码:
A
摘要:
目的：寻找一种新方法测量瓦里安Exact IGRT Couch表面碳纤维材料的HU值，并在计划系统中创建治疗床模型，以修正治疗床对射线剂量的衰减。方法：通过两种不同的射野组合对瓦里安Exact IGRT Couch床头薄端和中间中等厚度处对射线剂量的衰减进行测量，得到射线穿治疗床和不穿治疗床两种情况下的剂量偏差。在治疗计划系统（TPS）中定义多组不同的床表面材料的HU值，按照与测量相同的条件计算射线穿床和不穿床两种情况下剂量差异。通过数据比对分析，找到与实测相对应的治疗床材料的HU值。结果：两对穿射野在薄端处的衰减为-2.49%~-1.69%，在中等厚度处的衰减为-3.43%~-2.23%；多个斜入射射野在薄端处的衰减为-3.12%~-2.17%，在中等厚度处的衰减为-3.59%~-2.86%。当TPS中床模型表面和内部HU值分别定义为-500和-960时，两对穿射野在薄端处的衰减为-2.57%~-1.53%，在中等厚度处的衰减为-3.28%~-2.18%，多个斜入射射野在薄端处的衰减为-3.12%~-2.21%，在中等厚度处的衰减为-3.42%~-2.43%，与实测数值比较吻合。40个验证计划在薄端和中等厚度处实测点剂量与TPS计算剂量平均差异分别为0.90%和0.89%。结论：该新型测量方法可以预测Exact IGRT Couch表面碳纤维材料和内部泡沫材料的HU值，在TPS中定义床模型两种材料的HU值为-500和-960校正治疗床对射线的衰减，从而提高靶区和危及器官的剂量精度。
Abstract:
Abstract: Objective To develop a novel method for measuring the Hounsfield Unit (HU) value of the surface carbon fiber material of the Varian Exact IGRT Couch, and to establish a treatment couch model in the treatment planning system (TPS) for correcting the attenuation of radiation dose caused by the treatment couch. Methods Two different field combinations were used to measure the radiation dose attenuation at the thin end and the middle medium-thickness part of the Varian Exact IGRT Couch. Dose deviations were measured when radiation passed through the treatment couch or not. Multiple sets of different HU values for the couch surface materials were defined in the TPS, and the dose difference between with and without couch was calculated under the same conditions as the measurements. The HU value of the treatment couch material corresponding to the actual measurements was found by data comparison and analysis. Results The attenuation for two interpenetrating fields was -2.49% to -1.69% at the thin end, and -3.43% to -2.23% at the medium-thickness part. The attenuation for multiple oblique incident fields ranged from -3.12% to -2.17% at the thin end, and that was -3.59% to -2.86% at the medium-thickness part. When the HU values of the couch models surface and internal materials in the TPS were defined as -500 and -960, for two interpenetrating fields, the attenuation was -2.57% to -1.53% at the thin end, and -3.28% to -2.18% at the medium-thickness part while for multiple oblique incident fields, the attenuation was -3.12% to -2.21% at the thin ends, and -3.42% to -2.43% at the medium-thickness part. These calculated results were consistent with the actual measurement values. For 40 verification plans, the average point dose difference between measurement and calculation in TPS were 0.90% and 0.89% at the thin end and medium-thickness part, respectively. Conclusion This novel measurement method can measure the HU value of the surface carbon fiber material and internal foam material of Exact IGRT Couch. Defining the HU values of these two materials of the couch model in the TPS as -500 and -960 can correct the radiation dose attenuation caused by the treatment couch, thereby improving the dose accuracy of the target volume and organs-at-risk.

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备注/Memo

备注/Memo:
【收稿日期】2024-12-23 【基金项目】首都医学科学创新中心科研专项（CX23YZ04） 【作者简介】王广善，硕士研究生，研究方向：放射物理学，E-mail: wang_guangshan@163.com
更新日期/Last Update: 2025-09-30