Quality Assurance Procedure for Assessing Mechanical Accuracy of a Radiation Field Center in Stereotactic Radiotherapy
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- Tatsumi Daisaku
- Department of Radiology, Osaka City University Hospital
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- Ienaga Akinori
- Department of Radiology, Osaka City University Hospital
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- Nakada Ryosei
- Department of Radiology, Osaka City University Hospital
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- Yomoda Akane
- Department of Radiology, Osaka City University Hospital
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- Inoue Makoto
- Department of Radiology, Osaka City University Hospital
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- Ichida Takao
- Department of Radiology, Osaka City University Hospital
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- Hosono Masako
- Department of Radiology, Osaka City University Graduate School of Medicine
Bibliographic Information
- Other Title
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- 定位放射線照射における放射線アイソセンタの定量的管理手法の構築
- テイイ ホウシャセン ショウシャ ニ オケル ホウシャセン アイソセンタ ノ テイリョウテキ カンリ シュホウ ノ コウチク
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Description
Stereotactic radiotherapy requires a quality assurance (QA) program that ensures the mechanical accuracy of a radiation field center. We have proposed a QA method for achieving the above requirement by conducting the Winston Lutz test using an electronic portal image device (EPID). An action limit was defined as three times the standard deviation. Then, the action limits for mean deviations of the radiation field center during collimator rotation, gantry rotation, and couch rotation in clockwise and counterclockwise resulted in 0.11 mm, 0.52 mm, 0.37 mm, and 0.41 mm respectively. Two years after the QA program was launched, the mean deviation of the radiation field center during gantry rotation exceeded the above action limit. Consequently, a mechanical adjustment for the gantry was performed, thereby restoring the accuracy of the radiation field center. A field center shift of 0.5 mm was also observed after a micro multi-leaf collimator was unmounted.
Journal
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- Japanese Journal of Radiological Technology
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Japanese Journal of Radiological Technology 68 (10), 1333-1339, 2012
Japanese Society of Radiological Technology
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Keywords
Details 詳細情報について
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- CRID
- 1390282681339062784
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- NII Article ID
- 10031082173
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- NII Book ID
- AN00197784
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- COI
- 1:STN:280:DC%2BC3s%2FntlSgsw%3D%3D
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- ISSN
- 18814883
- 03694305
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- NDL BIB ID
- 024064652
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- PubMed
- 23089835
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- PubMed
- CiNii Articles
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- Abstract License Flag
- Disallowed