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Updated: Jun 16, 2026
08:17
Dynamic Lung Tumor Tracking for Stereotactic Ablative Body Radiation Therapy
Published on: June 7, 2015
Commissioning of an expanded-field radiation technique using a gimbal-mounted linear accelerator
Tomohiro Ono1,2, Fumiya Tanaka3, Shunta Jinno3
1Department of Radiation Oncology and Image-Applied Therapy, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
Physics and Imaging in Radiation Oncology
|June 15, 2026
Summary
A novel gimbal-mounted linear accelerator allows for precise off-axis radiation delivery. This technology was validated for expanded-field techniques and patient-specific quality assurance in radiotherapy.
Area of Science:
- Radiation Oncology
- Medical Physics
- Radiotherapy Technology
Background:
- A novel gimbal-mounted linear accelerator (linac) has been developed.
- This technology enables off-axis radiation beam delivery.
Purpose of the Study:
- Commission an expanded-field radiation technique using the gimbal-mounted linac.
- Validate beam data and implement patient-specific quality assurance (QA).
Main Methods:
- Performed measurements with gimbal head rotations (±50.0 mm pan/tilt) and compared with treatment planning system (TPS) calculations.
- Obtained percentage depth doses (PDDs) and off-center ratios (OCRs) for various field sizes and depths.
- Conducted film-based patient-specific QA for breast and esophageal cancer cases.
Main Results:
- Differences between measured and TPS-calculated doses were within ±2% for PDDs and OCRs under gimbal head rotation.
- Gamma passing rates of 3%/2 mm exceeded 90% for all patient-specific QA cases.
Conclusions:
- The novel technique enables precise and effective off-axis beam delivery.
- This advancement enhances the capabilities of modern radiotherapy.
