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Original Article

Korean Journal of Medical Physics 2015; 26(2): 106-111

Published online June 30, 2015

Copyright © Korean Society of Medical Physics.

Analysis of Couch Sag Using Image Processing of MVCT Images in Tomotherapy

Ha Ryung Park*, Yong Ho Kim*, Dahl Park*, Wontaek Kim, Yongkan Ki, Donghyun Kim, Jin Suk Bae*

*Department of Radiation Oncology, Pusan National University Hospital,Department of Radiation Oncology, Pusan National University School of Medicine, Busan, Korea

Received: May 4, 2015; Revised: June 11, 2015; Accepted: June 11, 2015

Abstract

In Tomotherapy the couch sags during the treatment due to the weight of the patient. In this study, we developed a simple method to obtain the amount of the sag and the pitch angle of the couch using the image processing technique of MVCT images in Tomotherapy. Using the method we evaluated the sag and pitch of couch for 22 head and neck patients and one craniospinal irradiation (CSI) patient. The sag and the average pitch angle of couch were 0.40∼1.54 mm and 0.7o for head and neck patients, respectively. For head and neck patients, the sag increased as the longitudinal length of the irradiation volume increased and the pitch angle showed no relationship with the longitudinal length. For the CSI patient the sag was 4.97 mm. Using the method the amount of the couch sag could be measured easily and the measured data could be useful in determination of margins considering the table sag error.

KeywordsTomotherapy, MVCT, Couch sag

Korean Society of Medical Physics

Vol.35 No.3
September 2024

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

Frequency: Quarterly

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