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Updated: Mar 2, 2026
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Dynamic Lung Tumor Tracking for Stereotactic Ablative Body Radiation Therapy
Published on: June 7, 2015
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TU-E-BRB-08: Dual Gated Volumetric Modulated Arc Therapy
J Wu1,2,3, B Fahimian1,2,3, H Wu1,2,3
1Purdue University, West Lafayette, IN.
Medical Physics
|May 19, 2017
Summary
Dual gated volumetric modulated arc therapy (VMAT) nearly doubles treatment efficiency for stereotactic body radiotherapy (SBRT) by alternating dose delivery between exhale and inhale phases. This novel approach significantly reduces treatment time while maintaining dose accuracy.
Area of Science:
- Radiation Oncology
- Medical Physics
Background:
- Gated Volumetric Modulated Arc Therapy (VMAT) is used for Stereotactic Body Radiotherapy (SBRT).
- Gating in VMAT prolongs treatment duration, impacting efficiency.
Purpose of the Study:
- To evaluate a novel dual gated VMAT technique for enhancing treatment efficiency.
- To experimentally assess the feasibility and performance of dual gated VMAT.
Main Methods:
- Developed custom XML scripts for Varian's TrueBeam STx to enable dual gated VMAT.
- Generated and combined RapidArc plans for inhale and exhale phases into a dual gated arc.
- Validated the dual gated plan on a motion phantom using pinpoint chamber, film, and diode array measurements.
Main Results:
- Achieved a 95.5% improvement in treatment time efficiency compared to single gated VMAT.
- Absolute dose measurements agreed with calculations within 0.7%.
- 97.5% of measurement points passed the 3% and 3mm gamma-test criterion.
Conclusions:
- Successfully developed and implemented dual gated VMAT.
- Demonstrated nearly doubled treatment delivery efficiency with high dosimetric accuracy.
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