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IMRT Plan Delivery Verification Utilizing a Spiral Phantom with Radiochromic Film Dosimetry

Pichler, Joseph Alan
http://rave.ohiolink.edu/etdc/view?acc_num=mco1288963613

Abstract Details

2010, Master of Science in Biomedical Sciences (MSBS), University of Toledo, College of Medicine.
The purpose of this study was to develop and report on the implementation and IMRT quality assurance plan delivery verification using a Spiral phantom. The phantom utilizes a cylindrical solid water system with a machined spiral trajectory for insertion of film. Several analyses were performed on various IMRT treatment plans comparing predicted planar fluence dose and measured dose using radiochromic film. A solid water cylindrical IMRT phantom manufactured by GAMMEX which has been machined creating a spiral cavity for placement of radiochromic film (GAFCHROMIC® EBT2) was employed for IMRT plan QA. This spiral phantom is implemented to measure data in a three dimensional (3D) subspace which was not previously demonstrated. The patient treatment plan with predicted planar and volumetric isodose distributions were obtained in Pinnacle treatment planning software (TPS). The patient treatment planning data using a CT data set was then projected onto the spiral phantom in the TPS where planar dose files were generated using a scripting file. The measured data was obtained upon successful delivery of the intended treatment plan with a linear accelerator on the spiral phantom with radiochromic film in place. Comparison of the predicted and measured data provides a quantitative and qualitative assessment and validation of the intended treatment when delivered as planned. The films were subsequently scanned and the measured dose data from the delivered plan were compared with the planar fluence dose maps generated in Pinnacle using RIT113 software. Schematic isodose overlays, vertical and horizontal dose profiles as well as IMRT distance to agreement (DTA) analysis of the predicted and measured dose distributions were shown to be in great accord with one another. One can easily see the value of this phantom as a quantitative and qualitative IMRT plan analysis tool.
E. Ishamael Parsai, PhD (Committee Chair)
David Pearson, PhD (Committee Member)
Diana Shvydka, PhD (Committee Member)
62 p.
Physics
IMRT; QA; radiochromic; TPS; planar dose; phantom

Recommended Citations

Citations

  • Pichler, J. A. (2010). IMRT Plan Delivery Verification Utilizing a Spiral Phantom with Radiochromic Film Dosimetry [Master's thesis, University of Toledo]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=mco1288963613

    APA Style (7th edition)

  • Pichler, Joseph. IMRT Plan Delivery Verification Utilizing a Spiral Phantom with Radiochromic Film Dosimetry. 2010. University of Toledo, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=mco1288963613.

    MLA Style (8th edition)

  • Pichler, Joseph. "IMRT Plan Delivery Verification Utilizing a Spiral Phantom with Radiochromic Film Dosimetry." Master's thesis, University of Toledo, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=mco1288963613

    Chicago Manual of Style (17th edition)

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© 2010, all rights reserved.
This open access ETD is published by University of Toledo Health Science Campus and OhioLINK.