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[Evaluation of new methods for removing moire artifact of radiochromic film]
Daisaku Tatsumi1, Ryosei Nakada, Norihisa Masai
1Department of Radiology, Osaka City University Hospital, Japan.
Abstract:
An optical interference-pattern, a moire artifact, is produced during the film scanning process using a flatbed scanner. Images with moire artifacts include optical density fluctuations thereby leading to inaccuracy of measurement. In this study, we proposed two methods for removing moire artifacts from radiochromic film and compared dose response and profile as well as image resolution and size between our proposed methods versus the conventional process. The proposed methods could remove the artifacts without impairing dosimetric performance. It is expected that the proposed methods facilitate more accurate film dosimetry with reflective radiochromic films.
Insights
Two new methods effectively remove moire artifacts from radiochromic film scans. These techniques improve image accuracy without compromising dosimetric performance for precise film dosimetry.
Area of Science:
- Medical Physics
- Image Processing
- Radiological Imaging
Context:
- Flatbed scanners generate moire artifacts during radiochromic film scanning.
- Moire artifacts cause optical density fluctuations, impacting measurement accuracy.
- Accurate dosimetry is crucial for radiation therapy and quality assurance.
Purpose:
- To propose and evaluate two novel methods for removing moire artifacts from scanned radiochromic films.
- To compare the proposed artifact removal techniques against conventional methods.
- To assess the impact of artifact removal on dosimetric performance and image quality.
Summary:
- Two methods were developed to eliminate moire artifacts in radiochromic film images.
- The proposed techniques successfully removed artifacts without negatively affecting dose response, profile, resolution, or size.
- Comparison with conventional scanning demonstrated the superiority of the new methods.
Impact:
- Enables more accurate film dosimetry using reflective radiochromic films.
- Reduces measurement errors caused by optical interference patterns.
- Facilitates improved quality assurance in radiation dosimetry.
