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Sweeping-window arc therapy: an implementation of rotational IMRT with automatic beam-weight calculation
1Division of Radiation Physics, Department of Radiation Oncology, Stanford Cancer Center, 875 Blake Wilbur Drive, Rm G-233, Stanford, CA 94305-5847, USA. ccameron@stanford.edu
Physics in Medicine and Biology
|September 9, 2005
Summary
Sweeping-window arc therapy (SWAT), a novel intensity-modulated radiation therapy (IMRT) technique, shows feasibility for optimized dynamic arc treatments. This method initializes optimization with a sweeping window sequence, enabling efficient dose modulation for clinical applications.
Area of Science:
- Radiation Oncology
- Medical Physics
- Radiotherapy Techniques
Background:
- Intensity-modulated radiation therapy (IMRT) is a cornerstone of modern radiotherapy.
- Dynamic arc therapy offers potential advantages in dose distribution and treatment time.
- Optimizing complex dynamic treatments remains a challenge.
Purpose of the Study:
- To introduce and evaluate Sweeping-Window Arc Therapy (SWAT) as a novel approach for dynamic arc treatments.
- To assess the feasibility and optimization potential of SWAT using direct aperture optimization (DAO).
- To test SWAT on a phantom model and a clinical prostate case.
Main Methods:
- SWAT utilizes a direct aperture optimization (DAO) approach initialized with a specific leaf sequence.
- The optimization process employs simulated annealing to achieve efficient dose modulation.
- Beam weights were calculated analytically, with extensions for variable beam weights considered.
Main Results:
- SWAT was tested on a phantom and a clinical prostate case, demonstrating feasibility.
- The method showed potential for generating deliverable dynamic arc treatments.
- Initial results suggest SWAT can achieve optimized dose modulation without excessive leaf speeds.
Conclusions:
- Sweeping-Window Arc Therapy (SWAT) is a feasible method for creating optimized dynamic arc radiotherapy plans.
- Further research, particularly in refining the dose model, is warranted.
- SWAT presents a promising avenue for advancing dynamic arc treatment delivery.
