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SU-E-T-121: Investigating the Optimal Scanning Resolution for Radiochromic EBT-2 Films Using an Epson 10000XL Flatbed

A Schoenfeld1,2, D Poppinga1,2, N Chofor1,2

  • 1University Oldenburg, Oldenburg, Germany.

Medical Physics
|May 19, 2017
PubMed
Summary

Determining the optimal scanner resolution for radiochromic EBT-2 films is crucial for accurate analysis. Resolutions as low as 52dpi for 6MV and 30dpi for 15MV are sufficient for evaluating EBT-2 films, aligning with manufacturer recommendations.

Keywords:
Digital image processingFourier analysisFourier transformsImage reconstructionImage scannersLeadLinear acceleratorsMaterials analysisSampling theorySecondary emission

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Area of Science:

  • Medical Physics
  • Radiological Imaging

Background:

  • Radiochromic films like EBT-2 are used for radiation dosimetry.
  • Accurate analysis of these films requires optimal image acquisition settings.
  • Scanner resolution is a critical parameter affecting image quality and data interpretation.

Purpose of the Study:

  • To determine the optimal scanner resolution for analyzing radiochromic EBT-2 films using an Epson 10000XL scanner.
  • To investigate the highest frequency component needed for accurate reproduction of step dose profiles.
  • To apply Fourier analysis and Nyquist-Shannon sampling theory for resolution assessment.

Main Methods:

  • Created sharp step dose profiles on EBT-2 films by shielding during exposure with a lead block.
  • Exposed films using a Siemens Primus linear accelerator at 6MV and 15MV.
  • Acquired initial images at 600dpi and applied uniformity correction.
  • Utilized Fast Fourier Transform (FFT) and iterative inverse FFT to reconstruct images after removing high-frequency components.
  • Evaluated image reconstruction accuracy by comparing penumbra width changes.

Main Results:

  • Minimum scanning resolutions required were 52dpi (6MV) and 30dpi (15MV) without build-up material.
  • With build-up material, required resolutions decreased to 12dpi (6MV) and 8dpi (15MV) in areas of secondary electron equilibrium.
  • These findings indicate lower resolutions are sufficient under specific conditions.

Conclusions:

  • Resolutions as low as 52dpi (6MV) and 30dpi (15MV) are sufficient for evaluating EBT-2 films with minimal information loss.
  • The determined optimal resolutions are in compliance with the manufacturer's recommendation of 50dpi.
  • This study provides practical guidance for optimizing scanner settings in radiochromic film dosimetry.