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Published on: February 20, 2021
Extrapolated surface dose measurements using a NdFeB magnetic deflector for 6 MV x-ray beams
N Damrongkijudom1, M Butson, A Rosenfeld
1Centre for Medical Radiation Physics, University of Wollongong, Wollongong, Australia.
A novel magnetic deflector device effectively reduces surface dose in radiation therapy. Radiographic film measurements confirm significant dose reduction compared to open fields, offering advanced 2D surface dose assessment.
Area of Science:
- Medical Physics
- Radiation Oncology
- Radiological Imaging
Background:
- Surface dose in radiation therapy can lead to complications.
- Minimizing skin dose is crucial for patient safety and treatment efficacy.
- Existing methods for surface dose assessment have limitations.
Purpose of the Study:
- To evaluate the effectiveness of a magnetic deflector device in reducing surface dose.
- To compare surface dose measurements using radiographic film and an ionization chamber.
- To assess the 2D dose distribution with and without the magnetic deflector.
Main Methods:
- Extrapolated surface dose measurements using radiographic film.
- Comparison with an Attix parallel plate ionization chamber.
- 2D dose mapping and profile analysis with and without a magnetic deflector for a 6 MV x-ray beam.
Main Results:
- The magnetic deflector reduced surface dose across all field sizes tested (10x10, 15x15, 20x20 cm²).
- Radiographic film measurements showed dose reductions from 14% to 27% compared to open fields.
- Attix chamber results corroborated the dose reductions, validating the film-based method.
Conclusions:
- The magnetic deflector is effective in reducing surface dose in radiation therapy.
- Radiographic film extrapolation is a viable and advanced method for 2D surface dose assessment.
- The magnetic deflector offers improved patient safety by minimizing skin dose.
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