Radiation Oncology/Tomotherapy

• 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:
  1. A collimator pair that defines the length of the strip
  2. A binary multileaf collimator whose leaves open and close during treatment to modulate the strip’s intensity
  3. A couch that scans the patient across the beam at a fixed speed the during treatment delivery