量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum and Radiological Science and Technology.
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We describe a method to calculate the relative biological effectiveness in mixed radiation fields of therapeutic ion beams based on the modified microdosimetric kinetic model (modified MKM). In addition, we show the procedure for integrating the modified MKM into a treatment planning system for a scanned carbon beam. With this procedure, the model is fully integrated into our research version of the treatment planning system. To account for the change in radiosensitivity of a cell line, we measured one of the three MKM parameters from a single survival curve of the current cells and used the parameter in biological optimization. Irradiation of human salivary gland tumor cells was performed with a scanned carbon beam in the Heavy Ion Medical Accelerator in Chiba (HIMAC), and we then compared the measured depth-survival curve with the modified MKM predicted survival curve. Good agreement between the two curves proves that the proposed method is a candidate for calculating the biological effects in treatment planning for ion irradiation.
Treatment planning for a scanned carbon beam with a modified microdosimetric kinetic model
