Robustness of patient positioning for interfractional error in carbon ion radiotherapy for stage I lung cancer: Bone matching versus tumor matching

Patient positioning was compared by tumor matching (TM) and conventional bony structure matching (BM) in carbon ion radiotherapy for stage I non-small cell lung cancer to evaluate the robustness of TM and BM in determining interfractional error. Sixty irradiation fields were analyzed. Computed tomog...

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Bibliographic Details
Published in:Radiotherapy and oncology 2018-10, Vol.129 (1), p.95-100
Main Authors: Sakai, Makoto, Kubota, Yoshiki, Saitoh, Jun-ichi, Irie, Daisuke, Shirai, Katsuyuki, Okada, Ryosuke, Torikoshi, Masami, Ohno, Tatsuya, Nakano, Takashi
Format: Article
Language:English
Subjects:
Bone matching
Carbon ion radiotherapy
Lung cancer
Patient positioning
Tumor matching
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Summary:Patient positioning was compared by tumor matching (TM) and conventional bony structure matching (BM) in carbon ion radiotherapy for stage I non-small cell lung cancer to evaluate the robustness of TM and BM in determining interfractional error. Sixty irradiation fields were analyzed. Computed tomography (CT) images acquired before treatment initiation for confirmation (Conf-CT) were obtained under the same settings as the treatment planning CT images and used to evaluate both positioning methods. The dose distributions were recalculated for Conf-CT using both BM and TM, and the dose–volume histogram parameters [V95% of clinical target volume, V5Gy(RBE) of normal lung, and acceptance ratio (ratio of cases with V95% > 95%)] were evaluated. The required margin, which in 90% of cases achieved the acceptable condition, was also examined. Using BM and TM, the median V95% was 98.93% and 100% (p 
ISSN:0167-8140
1879-0887
DOI:10.1016/j.radonc.2017.10.003