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KMID : 1164220140260010037
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Journal of Korean Society for Radiotherapeutic Technology
2014 Volume.26 No. 1 p.37 ~ p.42
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Evaluation of the efficiency of the Vac-lock type belly board in Pelvic cancer Radiation Treatment
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Kim Young-Yeun
Bang Seung-Jae
Jung Il-Sun
Kim Jung-Su
Kim Young-Kon
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Abstract
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Purpose : At the time of the pelvis cancer radiation treatment using the belly board, set-up error is large because of a prone position. In order to improve the reproducibility, we made Vac-lock type belly board. In this study, we attempt to validate its utility.
Materials and Methods : We compared belly board and Vac-lock type belly board through the OBI. OBI was performed three times with entire course of treatment and the setup errors in the direction of X axis, Y axis, Z axis were recorded and calculated the distance from the isocenter.
Results : X axis, Y axis, Z axis setup errors with existing belly board were 0.32 cm, 0.41 cm, 0.29 cm. The setup errors with the vac-lock type belly board were 0.12 cm, 0.19 cm, 0.17 cm. Further, errors of 0~0.29 cm were increased from 48% to 83% when using VLT belly board. Error of 0.5 cm or more was reduced from 21% to 2%.
Conclusion : Vac-lock type belly board is able to maintain the efficacy of existing and create to match the characteristics of the patient. Therefore We think that vac-lock type belly board is very useful in pelvic cancer patients.
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KEYWORD
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Vac-lock type belly board, On Board Imager, Reproducibility
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