Figure 3: The dose-volume-histogram for the target volume. ‘3D stationary’ represents 3D planning without considering motion. ‘3D moving’ simulates the 3D plan when organs move, but beams stay fix. ‘3D motion compensated’ shows results when the 3D plan is delivered and both, organs and beams move. ‘4D motion compensated’ shows results when the 4D plan is delivered and both, organs and beams move. If a 3D plan would be used without motion compensation, a large part of the target would get underdosed (blue line).