Optimized registering of film dosimetry to calculated doses for IMRT quality assurance

Sung Yong Park, J. W. Shin, Myonggeun Yoon, D. H. Shin, S. B. Lee, D. H. Lee, D. Y. Kim, K. H. Cho, D. O. Shin, M. S. Minhaj

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The purpose of this study is to develop a software for optimized registering of film dosimetry with calculated dose for Intensity Modulated Radiation Therapy (IMRT) quality assurance. The newly developed software consists of a film device driver and the verification of fluence map. A film device driver follows the TWAIN 32 protocol. This driver enables us to easily calibrate and scan the films in any film scanner. The fluence map verification software is programmed by C++, which is suitable for the extension of future work. Taking advantages of that multi platform Qt (Trolltech, Norway) GUI library, we have made it run on Windows and Linux operating systems even Mac OSX. For drawing and viewing the fluence map in 2 and 3D, OpenGL (SGI Corp., USA) is implemented. Both absolute point dosimetry and 3D film dosimetry were performed throughout the IMRT using Clinac 21EX’s millennium MLC. With these custom-written software modules, the measured and calculated dose distributions for axial planes were superimposed by coincidence of their origins, followed by comparison of the point doses at all matched positions. Then, with the optimization algorithm the setup errors were recovered. We have developed customwritten software modules for managing dose-distribution files, optimizing the position, calculating dose differences, and printing out the report. Differences between the calculated and measured doses over the 3% criterion could be reduced by 15% after applying the optimization algorithm. Optimization dramatically reduced the difference between measured and calculated dose distributions in all cases investigated.

Original languageEnglish
Title of host publicationIFMBE Proceedings
PublisherSpringer Verlag
Pages2000-2003
Number of pages4
Volume14
Edition1
Publication statusPublished - 2007
Externally publishedYes
Event10th World Congress on Medical Physics and Biomedical Engineering, WC 2006 - Seoul, Korea, Republic of
Duration: 2006 Aug 272006 Sep 1

Other

Other10th World Congress on Medical Physics and Biomedical Engineering, WC 2006
CountryKorea, Republic of
CitySeoul
Period06/8/2706/9/1

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Keywords

  • Film dosimetry
  • Intensity modulated radiation therapy
  • Optimization algorithm
  • Quality assurance

ASJC Scopus subject areas

  • Biomedical Engineering
  • Bioengineering

Cite this

Park, S. Y., Shin, J. W., Yoon, M., Shin, D. H., Lee, S. B., Lee, D. H., Kim, D. Y., Cho, K. H., Shin, D. O., & Minhaj, M. S. (2007). Optimized registering of film dosimetry to calculated doses for IMRT quality assurance. In IFMBE Proceedings (1 ed., Vol. 14, pp. 2000-2003). Springer Verlag.