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Ensuring Clinical Readiness: Commissioning, Acceptance and Performance Testing of Closed Bore Linear Accelerator
Anand Jadhav1, Ajinkya Gupte1, Prasad Raj Dandekar1
1Department of Radiation Oncology, Sir H. N. Reliance Foundation and Research Centre, Mumbai, Maharashtra, India.
Introduction:
Surface Guided Radiation Therapy (SGRT) enhances radiation therapy by providing real-time support without additional X-ray exposure. It ensures precise patient positioning, continuous monitoring, and motion management. However, closed-bore LINACs face optical line-of-sight challenges with ceiling-mounted SGRT systems.
Objective:
This study commissions the AlignRT InBore™ SGRT system on the Ethos™ LINAC at a Mumbai tertiary care center, evaluating accuracy, precision, reproducibility, and temporal stability.
Methods:
System Commissioning: 1) Acceptance tests per Vision RT's Form 412: Camera calibration, setup validation, thermal stability, relative shift accuracy. Phantom measurements for performance assessment. 3) Deliberate rotational motion errors to test detection capability.
Results:
Comparison with Existing Systems: 1) Consistent with SGRT performance on Halcyon™ LINAC (Nguyen et al.). 2) Reliable mechanical and imaging test results. Patient-Specific QA: 1) 51 adaptive treatment sessions. 2) High gamma pass rates confirmed clinical efficacy. 3) Essential for Ethos™ LINAC, which lacks 6D couch correction.
Conclusion:
This study demonstrates successful SGRT integration with Ethos™, improving treatment accuracy, patient comfort, and efficiency in closed-bore LINACs, advancing radiation oncology in India.
