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Contrast improvement in a new radiotherapy imaging system.
A Ostinelli1, M Frigerio, S Gelosa
1Department of Radiotherapy, Ospedale S. Anna, Como, Italy. fiszad1@pn.itnet.it
Summary
The EC-L Kodak system significantly improves radiation therapy beam localization contrast compared to conventional methods. This enhancement aids in accurately verifying treatment volumes during radiotherapy sessions.
Area of Science:
- Medical Physics
- Radiotherapy Technology
- Diagnostic Imaging
Background:
- Portal imaging is crucial for verifying radiotherapy treatment volumes in clinical settings.
- Low contrast in portal films is a primary limitation affecting image quality and diagnostic utility.
Purpose of the Study:
- To compare the EC-L Kodak system for radiation therapy beam localization against a conventional system.
- To evaluate the efficacy of a new contrast-enhanced imaging system for radiotherapy.
Main Methods:
- The Kodak EC-L system (film and cassette) was assessed for contrast enhancement.
- Image contrast was evaluated using a 4-step plexiglass wedge and an anthropomorphic phantom.
- Portal films were acquired using a 6 MV photon beam from a Varian Clinac 1800 linear accelerator.
Main Results:
- The Kodak EC-L system demonstrated a notable improvement in image contrast.
- This enhanced contrast facilitates accurate description of field placement relative to the region of interest.
Conclusions:
- Low contrast, characterized by minimal optical density differences between anatomical regions, remains a critical challenge in portal imaging.
- Optimizing film-screen combinations and exposure techniques is vital for enhancing portal film quality within radiotherapy quality assurance programs.