Relative position of target (T) and critical (C) volumes for different states in the breathing cycle. In the left figure both volumes move with a different velocity, in the right figure only the target volume moves. The one beam in the left figure and the two beams in the right figure all move synchronous to the target. Darker areas denote parts of the volumes hit by the beam.
Beam selection for 3D moving and 4D moving (left), where the beams move synchronous to the target volume (T), and for 4D fixed (right) where beams remain stationary.
A regular breathing pattern obtained from the CyberKnife system. The figure gives the motion ( axis, ) of three markers over the time ( axis).
The breathing pattern used for the simulations.
Location and motion of the respective volumes in the phantom.
Target volume DVHs for 3D stationary, 3D fixed, 3D moving, 4D fixed, 4D moving, respectively.
Critical volume DVHs for 3D stationary, 3D fixed, 3D moving, 4D fixed, 4D moving, respectively.
Isodose diagrams for the stationary plan (left) and Algorithm A (right). The figure shows isodose lines for 600, 900, 1200, 5100, 5400, and .
Notation used for algorithms and simulations.
Basic statistics on the dose distribution for different planning schemes.
Number of beams, MU, and planning time for the different algorithms.
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