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Commissioning and implementation of a pencil-beam algorithm with a Lorentz correction as a secondary dose calculation
Sameer Taneja1,2, Hesheng Wang1, David L Barbee1
1Department of Radiation Oncology, New York University Langone Medical Center, New York, New York, USA.
Journal of Applied Clinical Medical Physics
|December 3, 2024
Summary
This study successfully commissioned and implemented ClearCalc, a secondary dose calculation algorithm, into an adaptive workflow for MR-Linac, ensuring accurate radiation therapy planning without failures.
Area of Science:
- Medical Physics
- Radiation Oncology
- Radiotherapy Technology
Background:
- Accurate dose calculation is critical for effective radiotherapy.
- Adaptive radiotherapy workflows require robust secondary dose calculation algorithms.
- MR-Linacs offer advanced treatment capabilities necessitating precise planning tools.
Purpose of the Study:
- To commission a beam model in ClearCalc for MR-Linac secondary dose calculation.
- To integrate ClearCalc into an adaptive radiotherapy workflow.
- To validate the accuracy and reliability of ClearCalc in clinical use.
Main Methods:
- Developed an Elekta Unity MR-Linac beam model in ClearCalc using commissioning data.
- Validated the model through comparisons with measurements, Monaco, and heterogeneous/patient plans.
- Implemented ClearCalc as a post-adaptive planning physics check.
Main Results:
- ClearCalc percent depth-dose (PDD) curves showed <1.2% deviation from measurements.
- Field profile comparisons achieved 98% pass rate with 3%/3mm gamma criteria.
- Point dose and monitor unit (MU) comparisons met 5%/5MU thresholds in various phantom and patient plan tests.
Conclusions:
- Successfully commissioned and clinically implemented ClearCalc for MR-Linac adaptive planning.
- The validated beam model ensures accurate dose calculations within the adaptive workflow.
- No plan failures were reported, demonstrating the safety and efficacy of the implemented system.
