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SU‐FF‐T‐208: Evaluation of a New Radiochromic Film/Flatbed Scanner System for Planar Clinical Dosimetry

Publication ,  Conference
Goss, M; Oldham, M
Published in: Medical Physics
January 1, 2007

Purpose: To assess the accuracy and practicality of using GAFCHROMIC® EBT Film in combination with an Epson flat‐bed scanner for the verification of advanced treatment techniques in radiation therapy. The combination of EBT with flat‐bed scanner may represent a low cost and convenient alternative to currently used dosimetry systems. Methods and Materials: First the scanner temporal stability and variability of light source over the scanning area was investigated. Next the dependence on color bit‐depth was investigated by conducting scans of the same film using different bit‐depth parameters. The dose response and stability of EBT film was investigated in the range 0 to 8Gy with 6MV photon beams, and a depth‐dose comparison was made using 16× electrons to known ion chamber measurements. Intra and inter‐batch film reproducibility was investigated as well as dependence of OD on temperature at irradiation over a range of 10°C. Results: The reproducibility of the Epson scanner was found to be highly stable, to within 1.01%, over all ranges of OD studied. A slight non‐uniformity in background was observed, but this background was consistent enabling efficient correction. 48‐bit color depth was adopted for all experiments. The dose response curve of EBT film was found to be non‐linear but stable (within 1.06%) from immediately after irradiation to within one week after irradiation. The electron PDD curve showed excellent agreement with clinical PDD tables at all depths with the linac data. A maximum intra‐batch OD difference of 1.88% was observed, while a maximum OD difference of 5.76% was observed for samples from the same batch. The temperature sensitivity was found to be small, with maximum difference of 1.03% in optical density over the range of 10°C. Conclusions: The Epson® 4990 Scanner/ GAFCHROMIC® EBT Film dosimetry combination appears an accurate and convenient dosimetry system for radiation therapy. © 2007, American Association of Physicists in Medicine. All rights reserved.

Duke Scholars

Published In

Medical Physics

DOI

ISSN

0094-2405

Publication Date

January 1, 2007

Volume

34

Issue

6

Start / End Page

2449

Related Subject Headings

  • Nuclear Medicine & Medical Imaging
  • 5105 Medical and biological physics
  • 4003 Biomedical engineering
  • 1112 Oncology and Carcinogenesis
  • 0903 Biomedical Engineering
  • 0299 Other Physical Sciences
 

Citation

APA
Chicago
ICMJE
MLA
NLM
Goss, M., & Oldham, M. (2007). SU‐FF‐T‐208: Evaluation of a New Radiochromic Film/Flatbed Scanner System for Planar Clinical Dosimetry. In Medical Physics (Vol. 34, p. 2449). https://doi.org/10.1118/1.2760869
Goss, M., and M. Oldham. “SU‐FF‐T‐208: Evaluation of a New Radiochromic Film/Flatbed Scanner System for Planar Clinical Dosimetry.” In Medical Physics, 34:2449, 2007. https://doi.org/10.1118/1.2760869.
Goss, M., and M. Oldham. “SU‐FF‐T‐208: Evaluation of a New Radiochromic Film/Flatbed Scanner System for Planar Clinical Dosimetry.” Medical Physics, vol. 34, no. 6, 2007, p. 2449. Scopus, doi:10.1118/1.2760869.

Published In

Medical Physics

DOI

ISSN

0094-2405

Publication Date

January 1, 2007

Volume

34

Issue

6

Start / End Page

2449

Related Subject Headings

  • Nuclear Medicine & Medical Imaging
  • 5105 Medical and biological physics
  • 4003 Biomedical engineering
  • 1112 Oncology and Carcinogenesis
  • 0903 Biomedical Engineering
  • 0299 Other Physical Sciences