多种水等效材料的医用电子束修正因子研究

doi:10.3969/j.issn.1000-1158.2024.05.19

摘要
图/表
参考文献(19)
相关文章 (15)

全文: PDF (596 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要针对水等效材料在医用电子束剂量测量中修正因子的测量和使用问题,通过扫描医用电子束在水中和水等效材料中的百分深度剂量(percentage depth dose, PDD)曲线,计算获得深度缩放因子cpl、注量缩放因子hpl及总修正因子kpl的实验值。结果表明,通过cpl和hpl组合或仅使用kpl均可将水等效材料测量结果转换为水吸收剂量。比较PDD曲线表明,在10~20MeV电子能量下3种水等效材料通过cpl-hpl修正后的R50,较水中测量最大偏差分别为0.19%、0.28%、0.22%;经kpl修正得到的R50,较水中测量最大偏差分别为0.23%、0.29%、0.18%。结论:研究提供了多种材料cpl-hpl、kpl的实验值,可方便用户快速完成电子束水吸收剂量的测量,相比于cpl-hpl,使用kpl更加简单高效。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	姚金涛
	李毅华
	王坤
	王志鹏
	金孙均
	吴晗

关键词 ：电离辐射计量, 吸收剂量, 电子束, 缩放因子, 修正因子, 水等效材料

Abstract：In view of the measurement and application of the correction factor for water equivalent materials in medical electron beam dose measurement, the experimental values of depth scaling factor (cpl), fluence scaling factor (hpl) and total correction factor (kpl) are obtained by scanning the percentage depth dose (PDD) curve of medical electron beam in water and water-equivalent materials. The results show that the measurement results of water equivalent materials can be converted into absorbed dose to water by the combination of cpl and hpl or only using kpl. Comparing the PDD curves shows that the maximum deviation of R50 of three water-equivalent materials after cpl-hpl correction are 0.19%, 0.28% and 0.22% compared with that measured in water at the electron energy of 10~20MeV. The maximum deviation of R50 obtained by kpl correction are 0.23%, 0.29% and 0.18%, respectively. Conclusion: the experimental data of cpl-hpl and kpl are provided, which is convenient for users to quickly measure the absorbed dose to water of electron beam, and it is simpler and more efficient to use kpl than cpl-hpl.

Key words： ionizing radiation measurement absorbed dose electron beam scaling factor correction factor water-equivalent material

收稿日期: 2024-01-09 发布日期: 2024-05-23

PACS:

TB98

基金资助:国家重点研发计划(2023YFF0613500);中国计量科学研究院基本业务费(AKYZD2311)

通讯作者: 王志鹏(1991-),安徽太和人,中国计量科学研究院助理研究员,博士,主要从事加速器吸收剂量学方面的研究。Email:wangzp@nim.ac.cn E-mail: wangzp@nim.ac.cn

作者简介: 姚金涛(1998-),河北廊坊人,安徽理工大学硕士研究生,主要研究方向为加速器吸收剂量学。Email:1281395623@qq.com

引用本文:

姚金涛,李毅华,王坤,王志鹏,金孙均,吴晗. 多种水等效材料的医用电子束修正因子研究[J]. 计量学报, 2024, 45(5): 747-754.
YAO Jintao,LI Yihua,WANG Kun,WANG Zhipeng,JIN Sujun,WU Han. Correction Factors of Medical Electron Beams for Various Water-equivalent Materials. Acta Metrologica Sinica, 2024, 45(5): 747-754.

链接本文:

http://jlxb.china-csm.org:81/Jwk_jlxb/CN/10.3969/j.issn.1000-1158.2024.05.19 或 http://jlxb.china-csm.org:81/Jwk_jlxb/CN/Y2024/V45/I5/747

［5］	王继, 吴金杰, 郭思明, 等. 钼靶X射线空气比释动能的国际关键比对［J］. 计量学报, 2023, 44(5): 790-795.
［2］	王志鹏, 王坤, 金孙均, 等. 医用电子束水吸收剂量测量及其不确定度讨论［J］. 计量学报, 2023, 44(12): 1897-1903.
［4］	王志鹏, 邢书明, 王坤, 等. 高能X射线下水等效材料对水的等效性研究［J］. 计量学报, 2020, 41(2): 257-262.
［6］	ANDREO P, BURNS D T, HOHLFELD K, et al. Absorbed Dose Determination in External Beam Radiotherapy: An International Code of Practice for Dosimetry Based on Standards of Absorbed Dose to Water: IAEA TRS-398［S］. 2004.
［8］	BAGHANI R H, ROBATJAZI M. Scaling factors measurement for intraoperative electron beam calibration inside PMMA plastic phantom ［J］. Measurement, 2020, 165: 108096.
［12］	AL-SULAITI L, SHIPLEY D, THOMAS R, et al. Water equivalence of some plastic-water phantom materials for clinical proton beam dosimetry ［J］. Applied Radiation and Isotopes, 2012, 70(7): 1052-1057.
［14］	BAGHANI H R, ANDEROLI S, ROBATJAZI M. On the measurement of scaling factors in the RW3 plastic phantom during high energy electron beam dosimetry ［J］. Physical and engineering sciences in medicine, 2023, 46(1): 185-195.
［16］	MCEWEN R M, NIVEN D. Characterization of the phantom material Virtual WaterTM in high-energy photon and electron beams ［J］. Medical Physics, 2006, 33(4): 876-887.
［3］	胡金有, 邹炼, 谢朝, 等. 西门子大孔径CT模拟定位机CT值影响因素及其长期稳定性研究［J］. 计量学报, 2023, 44(5): 783-789.
［10］	HIRAKU F, KOICHI H, TATSYYA F, et al. Determination of scaling factors for a new plastic phantom at 6-15MeV electron beams ［J］. Radiation Physics and Chemistry, 2022, 193: 109994.
［18］	ANEREO P, BRAHME A, NAHUM A, et al. Influence of energy and angular spread on stopping-power ratios for electron beams ［J］. Physics in Medicine and Biology, 1989, 34(6): 751-768.
	WANG Z P, XING S M, WANG K, et al. Study on the Equivalence of Water Equivalent Materials to Water under High-energy X-ray ［J］. Acta Metrologica Sinica, 2020, 41(2): 257-262.
［13］	ADE N, EEDEN V D, PLESSIS D F. Characterization of Nylon-12 as a water-equivalent solid phantom material for dosimetric measurements in therapeutic photon and electron beams ［J］. Applied Radiation and Isotopes, 2020, 155: 108919.
［1］	ROEDER F, MORILLO V, SALEH-EBRAHIMI L, et al. Intraoperative radiation therapy (IORT) for soft tissue sarcoma-ESTRO IORT Task Force/ACROP recommendations ［J］. Radiotherapy and Oncology, 2020, 150: 293-302.
	WANG Z P, WANG K, JIN S J, et al. Measurements of Absorbed Dose to Water in Medical Electron Beams and Discussion of lts Uncertainty ［J］. Acta Metrologica Sinica, 2023, 44(12): 1897-1903.
	HU J Y, ZOU L, XIE Z,et al. Study on the Influencing Factors and Long-term Stability of the CT Number of Siemens Large Aperture CT Simulator［J］. Acta Metrologica Sinica, 2023, 44(5): 783-789.
	WANG J, WU J J, GUO S M, et al. The International Key Comparison in Mammoraphy X-rays Air-kerma［J］. Acta Metrologica Sinica, 2023, 44(5): 790-795.
［7］	JAN S, MARINA O, MICHAEL E, et al. Absorbed dose to water reference dosimetry using solid phantoms in the context of absorbed-dose protocols ［J］. Medical physics, 2005, 32(9): 2945-2953.
［9］	DANIEL J O, GABRIEL O S. Monte Carlo study of the chamber-phantom air gap effect in a magnetic field ［J］. Medical physics, 2017, 44(7): 3830-3838.
［11］	HILL R, KUNCIC Z, BALDOCK C. The water equivalence of solid phantoms for low energy photon beams ［J］. Medical physics, 2010, 37(8): 4355-4363.
［15］	TELLO V M, TAILOR R C, HANSON W F. How water equivalent are water-equivalent solid materials for output calibration of photon and electron beams ［J］. Medical Physics, 1995, 22(7): 1177-1189.
［17］	SCHOENFELD A A, HARDER D, POPPE B, et al. Water equivalent phantom materials for 192Ir brachytherapy ［J］. Physics in Medicine and Biology, 2015, 60(24): 9403-9420.
［19］	DINA G X, ROGERS D W O, MACKIE T R. Calculation of stopping-power ratios using realistic clinical electron beams ［J］. Medical Physics, 1995, 22(5): 489-501.