Fast and accurate contour propagation 55 Figure 1 – Exemplary propagated deformed contours (solid lines) provided by EVolution on a (A) transversal, (B) sagittal, and (C) coronal slice of the position verification MR scan for a long interval case in which no adaptations were necessary within the 2.5 cm ring around the Clinical Target Volume (CTV). The CTV is asymmetrical due to the inclusion of the Gross Tumour Volume (GTV) with a 4 mm margin, which is in the left peripheral zone of the prostate. Note some inaccuracies higher up in the deformed rectal contour, outside the ring, due to a large deformation. 3
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