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KMID : 1164220180300010065
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Journal of Korean Society for Radiotherapeutic Technology
2018 Volume.30 No. 1 p.65 ~ p.71
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Usefulness of Customized Cervical Spine Immobilizer in Head & Neck Image-Guided Radiation Therapy with Tomotherapy®
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Jin Sung-Eun
Chang Se-Wuk
Choi Jung-Hoan
Kim Min-Joo
Ahn Seung-Kwon
Lee Sang-Kyu
Cho Jung-Heui
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Abstract
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Purpose : Standardized pillow may not support patient's individual cervical spine thoroughly when head and neck radiation therapy with $Tomotherapy^{(R)}$ 수식 이미지. Therefore, the purpose of this study was to make a comparative analysis for the difference of using standardized pillow only and using customized cervical spine immobilizer with standardized pillow.
Materials and Methos : The head and neck cancer patients who are treated image-guided radiation therapy(IGRT) withTomotherapy® were divided into two groups, 20 patients using standardized pillow only, and 20 patients using customized cervical spine immobilizer with standardized pillow. We achieved 20 mega-voltage computed tomography(MVCT) image per patient, compared curvature of the cervical spine in MVCT with curvature of the cervical spine in CT-simulation.
Results : Results of comparative analysis were curvature consistency 95.9 %, maximum error of distance 41.9 mm, average distance error per fractionation 19.4 mm, average standard deviation 1.34 mm in case of using standardized pillow only, curvature consistency 98.9 %, maximum error of distance 12.9 mm, average distance error per fractionation 5.8 mm, average standard deviation 0.59 mm in case of using customized cervical spine immobilizer with standardized pillow.
Conclusion : Using customized cervical spine immobilizer shows higher reproducibility and low distance error, therefore customized cervical spine immobilizer could be useful for head and neck cancer patients who need radiation therapy.
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KEYWORD
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Customized cervical spine immobilizer, IGRT, Curvature of cervical spine
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