Relative Biological Effectiveness and Fractionation of Proton-Beam Therapy

Relative Biological Effectiveness and Fractionation of Proton-Beam Therapy
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质子束治疗的相对生物有效性和分割

DOI:
10.1007/978-981-13-7454-8_16
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发表时间:
2020
期刊:
Proton Beam Radiotherapy: Physics and Biology
影响因子:
--
通讯作者:
Matsumoto Yoshitaka
Matsumoto Yoshitaka
中科院分区:
--
文献类型:
--
作者:
Fukushima K;Takahashi K;Kusaka M;Ishimoto K;Otagaki S,Minami K;Fukushima N;Honoki K;Tsujiuchi T.;Matsumoto Yoshitaka

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辐射的生物效应取决于所使用的辐射源。传递到个体、组织和细胞的辐射质量以吸收剂量(戈伊)来测量,吸收剂量反映电离量。如果用相同吸收剂量的两次辐射照射细胞,则每单位体积引入相同数量的电离。实际上,需要考虑生物效应差异的值,因为根据辐射类型和/或由线性能量转移(LET)表示的辐射质量,具有相同吸收剂量的辐射引起不同的生物效应。相对生物学效应(RBE)用来表示生物效应的差异,在临床和基础生物学研究中,常采用等效剂量,即物理剂量乘以RBE。在质子束治疗中,RBE = 1.1被用作国际标准值。然而,由于RBE随剂量、辐射质量、射束深度和生物学终点变化很大。了解这些因素对RBE的影响,对于建立更高清晰度和更有针对性的质子治疗具有重要意义。本章详细介绍了资源效益的基本概念和影响资源效益价值的因素。
The biological effects of radiation depend on the source of radiation used. The quality of radiation delivered to the individual, to tissues, and to cells is measured in terms of absorbed dose (Gy), which reflects the quantity of ionization. If cells are irradiated with two radiations by the same absorbed dose, the same number of ionizations is introduced per unit volume. Actually, a value that considers the difference in biological effect is needed, because irradiation with the same absorbed dose induces different biological effects, depending on the type of radiation and/or radiation quality represented by the linear energy transfer (LET). Relative biological effectiveness (RBE) is used to show the difference in the biological effect, and in clinical and basic biological research, iso-effective dose which is often physical dose multiplied by RBE is used. In proton beam therapy, RBE = 1.1 is used as an international standard value. However, because RBE varies widely with dose, radiation quality, beam depth and biological endpoint. It is important to understand the effects of the factors for RBE to establish more higherdefinition and tailor-made proton therapy. This chapter details the basic concept of RBE and the factors that influence RBE value.
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