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Accuracy of TomoEDGE dynamic jaw field widths
Patrizia Urso1, Nathan A Corradini1, Cristina Vite1
1Radiotherapy Center, Clinica Luganese Moncucco SA, Lugano, Switzerland.
Journal of Applied Clinical Medical Physics
|July 31, 2018
Summary
This study evaluated TomoEDGE™ dynamic jaws on the TomoTherapy platform, finding them accurate for patient dose reduction. While most measurements met quality assurance tolerances, some asymmetric field widths showed deviations, suggesting further clinical significance studies are needed.
Area of Science:
- Medical Physics
- Radiation Oncology
- Radiotherapy Quality Assurance
Background:
- TomoEDGE™ dynamic jaws on the TomoTherapy H-series platform reduce patient dose at treatment edges.
- Accurate and reproducible field width (FW) dose profiles are crucial for precise TomoTherapy delivery.
- No prior long-term evaluations existed for the accuracy and precision of dynamic jaw dose profiles.
Purpose of the Study:
- To conduct a long-term evaluation of dynamic jaw FW dose profiles using TomoTherapy Quality Assurance (TQA).
- To assess the accuracy and precision of TomoEDGE™ technology in dose profile delivery.
- To compare measured profiles against AAPM Task Group 148 (TG-148) and manufacturer tolerances.
Main Methods:
- Measured 840 FW dose profiles over a 2-year period using 84 TQA procedures on the TomoTherapy platform.
- Analyzed full width at half maximum (FWHM) and constancy of dose profiles.
- Compared measurements against TG-148 and manufacturer-specific tolerances.
Main Results:
- FWHM evaluation showed FWs > 2.0 cm met TG-148 1% tolerance; asymmetric FWs ≤ 2.0 cm exceeded limits in 17.3% of cases.
- Constancy analysis revealed 95.2% of symmetric FW profiles were within 3% of baseline.
- Constancy analysis revealed 94.8% of asymmetric FW profiles were within 4% of baseline.
Conclusions:
- TomoEDGE™ technology demonstrates accuracy and precision in jaw positioning for TomoTherapy.
- The study identified a need for appropriate QA tolerances for asymmetric dynamic jaw movements.
- Further research is required to determine the clinical significance of observed dose profile discrepancies.
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