Pencil-beam scanning is a technique used in radiation therapy, particularly in proton therapy, for the precise delivery of radiation to tumors while minimizing exposure to surrounding healthy tissues. This method involves using a narrow, focused beam of protons (or other charged particles) that can be accurately directed to specific locations within a tumor. ### Key Aspects of Pencil-Beam Scanning: 1. **Precision Targeting**: The pencil-beam is small in diameter, allowing for highly precise targeting of tumors.
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