Evaluation of the relative biological effectiveness of spot-scanning proton irradiation in vitro

Author:

Maeda Kenichiro,Yasui Hironobu,Matsuura Taeko,Yamamori Tohru,Suzuki Motofumi,Nagane Masaki,Nam Jin-Min,Inanami Osamu,Shirato Hiroki

Abstract

Abstract Variations in relative biological effectiveness (RBE) from a fixed value of 1.1 are critical in proton beam therapy. To date, studies estimating RBE at multiple positions relative to the spread-out Bragg peak (SOBP) have been predominantly performed using passive scattering methods, and limited data are available for spot-scanning beams. Thus, to investigate the RBE of spot-scanning beams, Chinese hamster fibroblast V79 cells were irradiated using the beam line at the Hokkaido University Hospital Proton Therapy Center. Cells were placed at six different depths, including the entrance of the proton beam and the proximal and distal part of the SOBP. Surviving cell fractions were analyzed using colony formation assay, and cell survival curves were obtained by the curve fitted using a linear–quadratic model. RBE 10 and RBE 37 were 1.15 and 1.21 at the center of the SOBP, respectively. In contrast, the distal region showed higher RBE values (1.50 for RBE 10 and 1.85 for RBE 37 ). These results are in line with those of previous studies conducted using passive scattering proton beams. Taken together, these data strongly suggest that variations in RBE should be considered during treatment planning for spot-scanning beams as well as for passive scattering proton beams.

Funder

KAKENHI

JSPS KAKENHI

Publisher

Oxford University Press (OUP)

Subject

Health, Toxicology and Mutagenesis,Radiology Nuclear Medicine and imaging,Radiation

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