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Implementation of An In-House Radiochromic Film Dosimetry Software for Patient Specific Treatment Plan Quality Assurance

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R Schurr

R Schurr*, J Park, S Kim, Baylor Scott & White Health, Temple, TX


SU-I-GPD-T-546 (Sunday, July 30, 2017) 3:00 PM - 6:00 PM Room: Exhibit Hall

Purpose: To implement an in-house radiochromic film dosimetry software for patient-specific treatment plan quality assurance (QA)

Methods: An in-house radiochromic film dosimetry software was developed using MATLAB software to perform patient-specific treatment plan QA with Gafchromic EBT3 film. This is an extension of our existing MapCheck-based QA program especially for small target Stereotactic Radiosurgery. The in-house software (1) produces calibration curves, (2) registers film scans with the dose planes exported from Eclipse treatment planning system with manual or automatic image registration, (3) performs 2D Gamma analyses with user-specified criteria, and (4) automatically prints a summary document with the QA results as a PDF file for documentation. The software also supports the OneScan Protocol to enhance accuracy of dosimetry as well as reduce the waiting time for film development, enabling the patient-specific treatment plan QA to be performed within a single day. The 2D Gamma analyses can be performed using each single red, green, or blue color channel calibration or triple channel calibration technique. Three open fields and ten patient plans were delivered to the EBT3 film in a solid water phantom. The resulting film doses were evaluated against the relevant Eclipse planar doses with both in-house and a commercial software (FilmQA Pro, Ashland) with 3%/3 mm and 3%/1 mm Gamma criteria.

Results: The in-house film dosimetry software found to provide a streamlined process for quickly performing patient-specific treatment plan QA. Compared to the commercial software, the 2D Gamma pass rates are not statistically significantly different (p=0.05). The open fields and patient plans both showed good agreement between the film and Eclipse planar dose for all color channels.

Conclusion: The in-house film dosimetry software was validated in various treatment conditions and successfully implemented in our patient specific treatment plan QA program providing a simple linear workflow.

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