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KMID : 1164220180300010139
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Journal of Korean Society for Radiotherapeutic Technology
2018 Volume.30 No. 1 p.139 ~ p.151
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Development of Tomotherapy couch device capable of yaw-directional correction
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Chae Moon-Ki
Kwon Dong-Yeol
Sun Jong-Lyool
Choi Byeong-Ki
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Abstract
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Objectives : A self-made “Tomotherapy couch device” capable of correcting the Yaw direction was fabricated and evaluated for its usefulness.
Materials and Methods : “Tomotherapy couch device” capable of correcting the Yaw direction is made of rigid fibreboard with a flexural strength of 200 kg / cm2. CBCT Image from Novalis Tx and Iso-Align Phantom from MED-TEC were used to evaluate the physical accuracy. The treatment plan was designed using Accuray PrecisionTM and In House Head and Phantom. Accuray PrecisionARTTM and PrecisionTM was used to evaluate dose.
Results : Evaluation results, the self-fabricated device accurately corrected the setup error, Target dose was within 95 %~107 % of all. In order to directly evaluate the OAR dose according to the Yaw change, the absolute dose was measured. As a result, when the error in the Yaw direction was 3°, the specific OAR showed a maximum difference of 18.4 %.
Conclusion : “Tomotherapy couch device” capable of correcting the Yaw direction can be manufactured at a lower cost compared to the effect, and it can prevent the patient’s MVCT image dose for re-imaging. Accurate radiation therapy without errors can be performed.
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KEYWORD
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Tomotherapy, 6Dcouch, IGRT, IMRT
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