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Author Notes:

Eduard Schreibmann, Department of Radiation Oncology, Emory University School of Medicine, 1365 Clifton Rd., Atlanta, GA 30322, U.S.A.; phone: 404‐778‐3473; fax: 404‐778‐4319; email: E-mail address:edi@radonc.emory.org.

Subjects:

Keywords:

  • Science & Technology
  • Life Sciences & Biomedicine
  • Radiology, Nuclear Medicine & Medical Imaging
  • CBCT
  • OBI
  • Trilogy
  • QA
  • BEAM COMPUTED-TOMOGRAPHY
  • LINEAR-ACCELERATOR

Automated Quality Assurance for Image‐Guided Radiation Therapy

Tools:

Journal Title:

Journal of Applied Clinical Medical Physics

Volume:

Volume 10, Number 1

Publisher:

, Pages 71-79

Type of Work:

Article | Final Publisher PDF

Abstract:

The use of image-guided patient positioning requires fast and reliable Quality Assurance (QA) methods to ensure the megavoltage (MV) treatment beam coincides with the integrated kilovoltage (kV) or volumetric cone-beam CT (CBCT) imaging and guidance systems. Current QA protocol is based on visually observing deviations of certain features in acquired kV in-room treatment images such as markers, distances, or HU values from phantom specifications. This is a time-consuming and subjective task because these features are identified by human operators. The method implemented in this study automated an IGRT QA protocol by using specific image processing algorithms that rigorously detected phantom features and performed all measurements involved in a classical QA protocol. The algorithm was tested on four different IGRT QA phantoms. Image analysis algorithms were able to detect QA features with the same accuracy as the manual approach but significantly faster. All described tests were performed in a single procedure, with acquisition of the images taking approximately 5 minutes, and the automated software analysis taking less than 1 minute. The study showed that the automated image analysis based procedure may be used as a daily QA procedure because it is completely automated and uses a single phantom setup.

Copyright information:

© 2009 The Authors

This is an Open Access work distributed under the terms of the Creative Commons Attribution 3.0 Unported License (http://creativecommons.org/licenses/by/3.0/).

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