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Relevant reduction effect with a modified thermoplastic mask of rotational error for glottic cancer in IMRT

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Abstract

The purpose of this study was to analyze the glottis rotational error (GRE) by using a thermoplastic mask for patients with the glottic cancer undergoing intensity-modulated radiation therapy (IMRT). We selected 20 patients with glottic cancer who had received IMRT by using the tomotherapy. The image modalities with both kilovoltage computed tomography (planning kVCT) and megavoltage CT (daily MVCT) images were used for evaluating the error. Six anatomical landmarks in the image were defined to evaluate a correlation between the absolute GRE (°) and the length of contact with the underlying skin of the patient by the mask (mask, mm). We also statistically analyzed the results by using the Pearson’s correlation coefficient and a linear regression analysis (P <0.05). The mask and the absolute GRE were verified to have a statistical correlation (P < 0.01). We found a statistical significance for each parameter in the linear regression analysis (mask versus absolute roll: P = 0.004 [P < 0.05]; mask versus 3D-error: P = 0.000 [P < 0.05]). The range of the 3D-errors with contact by the mask was from 1.2% - 39.7% between the maximumand no-contact case in this study. A thermoplastic mask with a tight, increased contact area may possibly contribute to the uncertainty of the reproducibility as a variation of the absolute GRE. Thus, we suggest that a modified mask, such as one that covers only the glottis area, can significantly reduce the patients’ setup errors during the treatment.

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Authors and Affiliations

  1. Department of Radiation Oncology, College of Medicine, Soonchunhyang University of Korea, Bucheon, 14584, Korea

    Jae Hong Jung, Kwang Hwan Cho, Mi Ryeong Ryu, Sun Hyun Bae & Seong Kwon Moon

  2. Department of Biomedical Engineering, Research Institute of Biomedical Engineering, College of Medicine, The Catholic University of Korea, Seoul, 06591, Korea

    Jae Hong Jung, Bo-Young Choe & Tae Suk Suh

  3. Department of Radiation Oncology, University of Florida, Gainesville, FL, 32611, USA

    Joo-Young Jung

  4. Department of Radiation Oncology, International St. Mary’s Hospital, Incheon, 22711, Korea

    Yong Ho Kim

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  1. Jae Hong Jung
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  4. Mi Ryeong Ryu
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Correspondence to Bo-Young Choe.

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Jung, J.H., Jung, JY., Cho, K.H. et al. Relevant reduction effect with a modified thermoplastic mask of rotational error for glottic cancer in IMRT. Journal of the Korean Physical Society 70, 308–316 (2017). https://doi.org/10.3938/jkps.70.308

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  • DOI: https://doi.org/10.3938/jkps.70.308

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