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Performance of a cylindrical diode array for use in a 1.5 T MR-linac
A C Houweling1, J H W de Vries2, J Wolthaus2
1Department of Radiation Oncology, Academic Medical Center, Meibergdreef 9, 1105 AZ, Amsterdam, The Netherlands.
Physics in Medicine and Biology
|January 16, 2016
Summary
The ArcCHECK-MR, a quality assurance device, performs reliably in the strong magnetic fields of MR-linacs. This finding confirms its suitability for patient-specific radiotherapy quality assurance in advanced imaging-guided treatments.
Area of Science:
- Medical Physics
- Radiotherapy Technology
- Magnetic Resonance Imaging
Background:
- The development of Magnetic Resonance Imaging-Linear Accelerators (MR-linacs) integrates MRI with radiotherapy.
- Patient-specific quality assurance (QA) for MR-linac treatment plans requires QA equipment that functions within a 1.5 T magnetic field.
- Existing QA equipment must be validated for performance in these novel environments.
Purpose of the Study:
- To evaluate the performance characteristics of the ArcCHECK-MR diode array.
- To assess its compatibility and reliability within a transverse 1.5 T magnetic field of an MR-linac.
- To determine if the ArcCHECK-MR is suitable for quality assurance in MRI-guided radiotherapy.
Main Methods:
- The ArcCHECK-MR diode array was tested on both a conventional linear accelerator and an MR-linac.
- Performance characteristics evaluated included short-term reproducibility, dose linearity, dose rate dependence, field size dependence, dose per pulse dependence, and inter-diode dose response variation.
- Measurements were compared between the two linac systems.
Main Results:
- The ArcCHECK-MR diode array demonstrated robust performance across all tested parameters on both the conventional linac and the MR-linac.
- No significant differences in performance characteristics were observed between the two linac systems.
- Maximum dose deviations between the two linacs were consistently less than 1.5%.
Conclusions:
- The ArcCHECK-MR diode array performs reliably and accurately in a transverse 1.5 T magnetic field.
- It is suitable for patient-specific quality assurance of treatment plans for MRI-based image-guided radiotherapy.
- The ArcCHECK-MR is a viable QA tool for MR-linac technology.
