Fig. 2
From: Ablative radiation therapy for locally advanced pancreatic cancer: techniques and results
CBCTs are used verify the target position as well as day-to-day variation in the position of the adjacent luminal GI tract. Simulation CTs of two patients displaying the critical max point dose for stomach (yellow) (a) and small bowel (magenta) (c). Corresponding DIBH CBCT images displaying the same isodose lines (b and d) are shown to the right. Stomach position may be affected by filling with food and air (a and b), while the duodenum is very reproducible (c and d)