J Med Phys Close
 

Figure 3: Two patients representing differences in PTV margin expansion due to the posterior CTV angle with patient a demonstrating [a] greater reduction in posterior margin than patient [b]. The CTV is represented in blue, the 6 mm PTV expansion in green, standard PTV expansion in red, and rectum in brown

Figure 3: Two patients representing differences in PTV margin expansion due to the posterior CTV angle with patient a demonstrating [a] greater reduction in posterior margin than patient [b]. The CTV is represented in blue, the 6 mm PTV expansion in green, standard PTV expansion in red, and rectum in brown