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MRI-Linac-based contours on (A) the 0.35 Tesla MRIdian system and (B) a legacy CT planning scan. CTV is in yellow, isotropic 2 mm PTV is in red. Anatomic boundaries of the prostate are more clearly visualized with MRI guidance, enabling radical isotropic margin reduction from 4 mm to 2 mm. CT-only-based planning would result in a larger PTV margin than is currently displayed in image B.
