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Geometrical verification system using Adobe Photoshop in radiotherapy
Hiromichi Ishiyama1, Koji Suzuki, Keiji Niino
1Department of Radiology, Kitasato University Hospital, Kanagawa, Japan.
Radiation Medicine
|March 25, 2005
Summary
Adobe Photoshop significantly improves geometrical verification accuracy by allowing simultaneous digital comparison of portal and simulation films. This digital method is more precise than traditional light box comparisons for radiotherapy planning.
Area of Science:
- Medical Physics
- Radiotherapy
- Image Analysis
Background:
- Accurate geometrical verification is crucial in radiotherapy.
- Traditional film-based comparisons have limitations in precision.
- Digital image processing offers potential for enhanced accuracy.
Purpose of the Study:
- To evaluate the accuracy of a geometrical verification system utilizing Adobe Photoshop.
- To compare the precision of digital film comparison with traditional light box methods.
Main Methods:
- Two verification conditions were tested: traditional light boxes and digital display via Adobe Photoshop.
- Examiners measured distances between simulation and portal film isocenters, adjusting bony structures.
- Lead balls served as fiducial markers for accurate film matching and control data acquisition.
Main Results:
- The geometrical verification system using Adobe Photoshop demonstrated significantly smaller errors compared to the light box method (p < 0.007).
- Digital comparison via Photoshop proved more accurate for assessing geometrical accuracy.
Conclusions:
- The Adobe Photoshop-based geometrical verification system is a viable and accurate tool.
- This system enhances verification accuracy and is accessible on standard PCs.
- Digital image comparison offers a superior method for radiotherapy verification.