KMID : 1164220100220010011
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Journal of Korean Society for Radiotherapeutic Technology 2010 Volume.22 No. 1 p.11 ~ p.18
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Evaluation on Usefulness of Applying Body-fix to Liver Cancer Patient in Tomotherapy
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Oh Byung-Cheon
Choi Tae-Gu Kim Gi-Chul
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Abstract
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Purpose: In every time radiation therapy set up errors occur because internal anatomical organs move due to breathing and change of patient¡¯s position. These errors may affect the change of dose distribution between target area and normal structure. This study investigates the usefulness of body-fix in clinical treatment.
Materials and Methods: Among 55~60 aged male patients who has hepatocellular carcinoma in area of liver¡¯s couinaud classification, we chose 10 patients and divided two groups by using body-fix or not. When applying body-fix, we maintained a vacuum of 80 mbar pressure by using vacuum pump (Medical intelligence, Germany). Patients had free breathing with supine position. After working to fuse and consist MV-CT (megavoltage computed tomography) with KV-CT (kilovoltage computed tomography) obtained by 5 times treatments, we compared and analyzed set up errors occurred to (Right to Left, RL) of X axis, (Anterioposterio, AP) of Z axis, (Cranicoudal, CC) of Y axis.
Results: Average Set up errors through image fusion showed that group A moved 0.3¡¾1.1 mm (Cranicoudal, CC), -1.1¡¾0.7 mm (Right to Left, RL), -0.2¡¾0.7 mm (Anterioposterio, AP) and group B moved 0.62¡¾1.94 mm (Cranicoudal, CC), -3.62¡¾1.5 mm (Right to Left, RL), -0.22¡¾1.2 mm (Anterioposterio, AP). Deviations of X, Y and Z axis directions by applying body-fix indicated that maximum X axis was 5.5 mm, Y axis was 19.8 mm and Z axis was 3.2 mm. In relation to analysis of error directions, consistency doesn¡¯t exist for every patient but by using body-fix showed that the result of stable aspect in spite of changes of everyday¡¯s patient position and breathing.
Conclusion: Using body-fix for liver cancer patient is considered effectively for tomotherapy. Because deviations between group A and B exist but they were stable and regular.
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KEYWORD
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tomotherapy, body-fix, setup variation
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