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Technical Note: Improving VMAT delivery efficiency by optimizing the dynamic collimator trajectory.
- Source :
-
Medical physics [Med Phys] 2019 Sep; Vol. 46 (9), pp. 3877-3882. Date of Electronic Publication: 2019 Jul 17. - Publication Year :
- 2019
-
Abstract
- Purpose: To provide a method for optimizing the multileaf collimator angle trajectory in volumetric modulated arc therapy (VMAT) in order to make VMAT delivery and planning more efficient.<br />Methods: Static fluence maps are optimized at a 10-degree spacing around the patient. Sliding window delivery time of each of these fields is computed for a large set of possible collimator orientations. An optimal trajectory, which selects a collimator angle for each field and assures that the collimator angles do not differ excessively between adjacent fields, is computed by solving a network flow model of a shortest path problem.<br />Results: For four clinical cases (two brains, an anal, and a spine), we demonstrate time reductions from 6% to 32% (average: 24%) for the optimal static angle vs the worst static angle. Further reductions from 3% to 17% (average 9%) are achievable when dynamic collimator trajectories are allowed.<br />Conclusions: Dynamic collimator trajectories, which can be computed with an efficient linear programming formulation, can improve the efficiency of VMAT delivery.<br /> (© 2019 American Association of Physicists in Medicine.)
Details
- Language :
- English
- ISSN :
- 2473-4209
- Volume :
- 46
- Issue :
- 9
- Database :
- MEDLINE
- Journal :
- Medical physics
- Publication Type :
- Academic Journal
- Accession number :
- 31220355
- Full Text :
- https://doi.org/10.1002/mp.13671