Figure 3
From: A margin-based analysis of the dosimetric impact of motion on step-and-shoot IMRT lung plans
The effect of varying the motion amplitude, drift and offset on ∆D 95% are shown separately in a, b and c respectively, and combined in d. Each of the plots shows the effect of increasing the target displacement outside the PTV (‘Max Displacement – Margin’) on target D95%. The shaded regions represent < ±3% change in D95%. Least-square quadratic fits are shown for each motion direction.