Figure A2.
(a) CLIN plan with manually selected beam angles for patient 25, with a centrally located tumor. (b–d) iCE plans with 6, 4 and 8 optimized beam angles for the same patient. Dose is shown relative to the prescribed dose (66 Gy). Contours are the PTV (red), lungs (yellow), esophagus (grey) and spinal cord (cyan), and beam angles are indicated by white lines. For this patient, the distribution of high dose in the CLIN plan was not as conformal as desired. The 6-beam iCE plan has slightly higher lung and esophagus Dmean and better high dose conformity.