Use Dose Bricks Concept to Implement Nasopharyngeal Carcinoma Treatment Planning
Figure 2
(L’t) Left superior anterior oblique (LSAO) field was added to create an “A” shape dose overlap region (overlapping of RSAO and LSAO). This picture shows the split field of LSAO in coronal plane. Right and left side parotid glands were represented in pink and brown colors, respectively. In this field, couch was rotated to 250°, gantry was rotated to 98°, and collimator was rotated at degree of 172°. Sixty-degree wedge with “thick head” toward gantry side was added for dose uniform modification. (R’t) This picture shows the Beam’s Eye View (BEV) in Digital Reconstruction Radiograph (DRR) of LSAO field. Two central axis nondivergence planes (denoted as “split field” on the left hand side) are ready to be abutted by RAO (vertical) and SIV (horizontal) fields.
