428 / 1245
23
Tilting cont...
Effects increase with
– tilting angle, i.e.
shorter SSD
larger fields (and off axis segments)
- longer particle range, i.e.
low density regions (lung)
higher energies
Sharpe & Battista 1993 MedPhys 20 pp 1685-94
50 cm SSD
100 cm SSD