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IMRT: delivery techniques and quality assurance

North Western Medical Physics, Christie Hospital, Manchester M20 4BX, UK

View larger version (30K): [in a new window]   Figure 1. Two sets of segments to reconstruct a quantised intensity distribution.

View larger version (8K): [in a new window]   Figure 2. Diagram to explain the tongue and groove effect. A and B are regions that could be irradiated as abutting segments. R is the restricted aperture caused by the leaf overlap.

View larger version (12K): [in a new window]   Figure 3. Flow diagram for the planning of segmented intensity modulated radiotherapy. PTV, planning target volume; OAR, organ at risk.

View larger version (12K): [in a new window]   Figure 4. Variation of dose per monitor unit with segment dose (from Hansen et al, 1998 [24]).

View larger version (17K): [in a new window]   Figure 5. The principle of the dynamic sliding window modulation.

View larger version (16K): [in a new window]   Figure 6. The generation of dynamic leaf trajectories from a modulated profile. A required profile. B trajectories without velocity constraints. C trajectories constrained to maximum leaf velocity.

View larger version (15K): [in a new window]   Figure 7. The dynamic tolerance concept.

View larger version (14K): [in a new window]   Figure 8. Intensity modulated radiotherapy fields for five gantry angles.