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How do we cope with this variation ?
Single CT scan
Assess rectum filling CT scan: empty, medium, full
Make three plans with different CTV-PTV margins at ventral
side of upper mesorectum:
Rectum
Full
Medium
Empty
Margins
-25 mm, -15 mm, 0 mm -15 mm, 0 mm, 15 mm 0 mm, 15 mm, 25 mm
Plan selection - rectum