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Characterization and commissioning of a new collaborative multi-modality radiotherapy platform
Zhongfei Wang1, Xiaohuan Sun1, Wei Wang1
1Department of Radiation Oncology, Xijing Hospital, Fourth Military Medical University, 710032, Xi'an, Shaanxi Province, P.R. China.
Physical and Engineering Sciences in Medicine
|June 28, 2023
Summary
The TaiChi radiotherapy platform, integrating a linear accelerator and gamma system, passed all clinical commissioning tests. This multi-modality system demonstrates excellent mechanical and dosimetry accuracy for advanced cancer treatment.
Area of Science:
- Medical Physics
- Radiation Oncology
- Radiotherapy Technology
Background:
- The TaiChi platform is a novel multi-modality radiotherapy system.
- It integrates a linear accelerator, a focusing gamma system, and kV imaging within an O-ring gantry.
- Clinical application necessitates rigorous assessment of its technological capabilities.
Purpose of the Study:
- To evaluate the technological characteristics of the TaiChi platform.
- To assess the commissioning results of the TaiChi platform against established guidelines.
- To verify the mechanical and dosimetric accuracy of the integrated systems.
Main Methods:
- Commissioning followed manufacturer's Customer Acceptance Tests (CAT) and AAPM Task Group (TG) guidelines.
- Linear accelerator (linac) testing included beam model validation, IMRT/VMAT, end-to-end (E2E) tests, and patient-specific QA.
- Focusing gamma system and imaging system performance were assessed using ion chambers, diodes, films, and image quality metrics (CNR, spatial resolution, uniformity).
Main Results:
- All CAT tests met manufacturer specifications.
- Linac and gamma system commissioning met AAPM TG-119 and TG-218 criteria, with dose differences below 1.79% and gamma passing rates above 95.1% (3%/2 mm).
- Imaging isocenter coincidence was within 0.5 mm, and image quality parameters met specifications.
Conclusions:
- The TaiChi multi-modality radiotherapy platform successfully passed all Customer Acceptance Tests and AAPM commissioning criteria.
- Commissioning results confirm the platform's high mechanical and dosimetric accuracy.
- The TaiChi platform is suitable for clinical application in advanced radiotherapy.
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