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- Patients scanned across a modulated strip-beam
- Only one “slice” (Greek prefix “tomo-”) of the target exposed at any one time by the linear accelerator (linac) beam
- The three components distinctive to this modality:
- A collimator pair that defines the length of the strip
- A binary multileaf collimator whose leaves open and close during treatment to modulate the strip’s intensity
- A couch that scans the patient across the beam at a fixed speed the during treatment delivery
