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Dosimetric Optimization and Commissioning of a High Field Inline MRI-Linac
Urszula Jelen1, Bin Dong1, Jarrad Begg1,2,3
1Department of Medical Physics, Ingham Institute for Applied Medical Research, Liverpool, NSW, Australia.
Frontiers in Oncology
|March 3, 2020
Summary
Commissioning the Australian MRI-linac involved fine-tuning beam alignment and shielding. This prototype system
Area of Science:
- Medical Physics
- Radiation Oncology
- Magnetic Resonance Imaging-Linear Accelerator (MRI-Linac) Technology
Background:
- MRI-Linac systems present unique commissioning and quality assurance challenges due to component interactions.
- The inline MRI-Linac design, with the radiation beam parallel to the magnetic field, requires specific optimization strategies.
Purpose of the Study:
- To commission the radiation-related aspects of the Australian MRI-Linac prototype for clinical treatment applications.
- To address the challenges posed by the inline orientation and magnetic field interactions.
Main Methods:
- Fine-tuning radiation beam alignment and magnetic shielding.
- Benchmarking machine performance against IEC standards (IEC60976/77).
- Acquiring geometric and dosimetric data per AAPM TG 106 for treatment planning and Monte Carlo simulations, accounting for magnetic field effects.
Main Results:
- Achieved radiation beam and imaging isocenter alignment within 2 mm tolerance.
- Commissioned the system at 2.4 m and 1.8 m source-to-isocenter distances (SIDs).
- Quantified electron focusing effects and investigated minimization methods, noting no characteristic transverse system penumbra asymmetry.
Conclusions:
- Developed and applied methods to investigate and quantify dosimetric properties of an inline MRI-Linac.
- The Australian MRI-Linac has been successfully commissioned, advancing the clinical application of inline MRI-Linacs.
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