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SU-E-T-641: Flattening Filter Free Dynamic Conformal Arcs for Lung Radiotherapy
Medical Physics
|May 19, 2017
Summary
Flattening filter free dynamic conformal arcs (DCA) offer a rapid and effective method for lung stereotactic body radiotherapy (SBRT). This technique reduces treatment times, potentially improving patient comfort and treatment accuracy.
Area of Science:
- Radiation Oncology
- Medical Physics
Background:
- Lung stereotactic body radiotherapy (SBRT) requires precise dose delivery.
- Dynamic conformal arcs (DCA) and flattening filter free (FFF) beams are advanced radiotherapy techniques.
Purpose of the Study:
- To evaluate the efficacy of DCA with FFF beams for lung SBRT on the TrueBeam STx platform.
- To assess treatment planning and delivery efficiency.
Main Methods:
- Eight SBRT patients were planned using DCA with 6 MV FFF beams on a TrueBeam STx.
- Tumor location dictated planning strategies: single arc for peripheral, additional fields for chest wall involvement, and multiple DCA for central/spinal proximity.
- Eclipse software's 'Fit and Shield' feature was used for dose shaping with weighted arcs.
Main Results:
- Average beam-on time was 2.00 minutes, with treatments ranging from 1.22 to 3.3 minutes.
- Planning target volume (PTV) coverage of >= 95% was achieved for the 100% isodose line in all cases.
- The conformality index averaged 2.5, with a range of 1.12-4.5.
Conclusions:
- FFF DCA is a time-efficient method for SBRT planning and delivery.
- Shorter treatment durations can minimize patient motion and discomfort, potentially enhancing treatment precision and outcomes.
