ESTRO course on Image Guided Radiotherapy in Clinical Practice 2018
Margins
• CTV Margins: less relevant - PTV always overlaps the GI OARs, so dose is limited by this proximity. • Creates a dose gradient that is adjusted by normal tissue position on daily basis
3 mm plan
5 mm plan
Stomach
Stomach
Duodenum
Duodenum
Pancreas
Pancreas
Small intestine
Small intestine
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