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Original Article

Korean Journal of Medical Physics 2015; 26(1): 6-11

Published online March 31, 2015

Copyright © Korean Society of Medical Physics.

Rotation Errors of Breast Cancer on 3D-CRT in TomoDirect

Jae Hong Jung*‡, Kwang Hwan Cho*, Seong Kwon Moon*, Sun Hyun Bae*, Chul Kee Min*, Eun Seog Kim*, Seung-Gu Yeo*, Jin Ho Choi, Joo-Yong Jung, Bo Young Choe, Tae Suk Suh

*Department of Radiation Oncology, College of Medicine, Soonchunhyang University of Korea, Bucheon,Department of Radiation Oncology, Gachon University Gil Medical Center of Korea, Incheon, Department of Biomedical Engineering and Research Institute of Biomedical Engineering, The Catholic University of Korea, Seoul, Korea

Received: March 2, 2015; Revised: March 12, 2015; Accepted: March 17, 2015

Abstract

The purpose of this study was to analyze the rotational errors of roll, pitch, and yaw in the whole breast cancer treated by the three-dimensional radiation therapy (3D-CRT) using TomoDirect (TD). Twenty-patient previously treated with TD 3D-CRT was selected. We performed a retrospective clinical analysis based on 80 images of megavoltage computed tomography (MVCT) including the systematic and random variation with patient setup errors and treatment setup margin (mm). In addition, a rotational error (degree) for each patient was analyzed using the automatic image registration. The treatment margin of X, Y, and Z directions were 4.2 mm, 6.2 mm, and 6.4 mm, respectively. The mean value of the rotational error for roll, pitch, and yaw were 0.3°, 0.5°, 0.1°, and all of systematic and random error was within 1.0°. The errors of patient positioning with the Y and Z directions have generally been mainly higher than the X direction. The percentage in treatment fractions in less than 2° at roll, pitch, and yaw are 95.1%, 98.8%, and 97.5%, respectively. However, the edge of upper and lower (i.e., bottom) based on the center of therapy region (point) will quite a possibility that it is expected to twist even longer as the length of treatment region. The patient-specific characters should be considered for the accuracy and reproducibility of treatment and it is necessary to confirm periodically the rotational errors, including patient repositioning and repeating MVCT scan.

KeywordsBreast cancer, Setup error, Rotation error, MVCT

Korean Society of Medical Physics

Vol.35 No.2
June 2024

pISSN 2508-4445
eISSN 2508-4453
Formerly ISSN 1226-5829

Frequency: Quarterly

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