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A three-field breast treatment technique with precise geometric matching using multileaf collimator-equipped linear
Xing-Qi Lu1, Stephanie Sullivan, Thomas Eggleston
1Department of Radiation Oncology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA. xlu@bidmc.harvard.edu
Summary
This study introduces an improved three-field breast treatment technique. It enhances setup reproducibility and reduces radiation scatter to the contralateral breast, improving patient safety.
Area of Science:
- Radiation Oncology
- Medical Physics
Background:
- Traditional three-field breast treatments face challenges with existing solutions.
- Improving dose delivery and reducing scatter are critical in breast radiotherapy.
Purpose of the Study:
- To present a novel three-field breast treatment technique.
- To overcome limitations of previous methods, reduce scatter, and enhance setup reproducibility.
Main Methods:
- Patients positioned with arms raised; couch and collimator rotation for field matching.
- Supraclavicular field half-beam blocked; tangent posterior borders defined by multileaf collimation.
- Verification measurements for field matching and scatter dose evaluation.
Main Results:
- Achieved smooth dose transition at the match line across all depths.
- Eliminated corner blocks and lower wedges, significantly reducing scatter to the contralateral breast.
- Demonstrated improved setup reproducibility compared to prior techniques.
Conclusions:
- The new technique provides precise field matching without constraining tangent length.
- Successfully implemented in routine clinical practice since 2001.
- A software tool for calculating setup parameters is available.