Dosimetric effects of internal margin, auto flash, and virtual bolus in VMAT-based whole-breast radiotherapy under motion variations.

Key Points

• The aim is to evaluate the dosimetric effects of different techniques in VMAT-based whole-breast radiotherapy under motion variations.
• Compared conventional INT approach with AF and VB techniques
• Assessed robustness against motion variations
• Evaluated target coverage and breast swelling impacts
• AF improved dosimetric robustness against breast swelling
• VB maintained target coverage during insufficient breath-holding
• Conventional INT was least effective under motion variations