Fig. 1
From: Ablative radiation therapy for locally advanced pancreatic cancer: techniques and results
Contouring and plan evaluation. a and c Simulation CTs showing GTV (cyan), PTV high dose (red) and PTV microscopic dose (yellow) as well as stomach (orange) with a carve-out structure (brown) used to ensure exclusion of stomach from PTV high dose as demonstrated by the white arrow. b and d Dose distributions with the lowest displayed dose set to the critical max point dose for stomach (60Gy). White arrow indicates that 60Gy isodose line is away from the surface of the stomach, which was achieved by creating a PRV (not shown). c and d An example that includes an optional PTV ultra-high dose (magenta)