Figure 3.

AP (left axes) and SI (right axes) dose profiles for 7 cm target (a), mock head and neck (b), multi‐target (c), and C‐shape (d) VMAT plans. Pinnacle calculations (TPS), 3DVH measurement‐guided reconstruction (3DVH), and independent measurements ($\text{OSLD}+\text{ion}$ chamber in the center) are compared. The left and right scales are shifted to separate the profiles for better visualization; otherwise AP and SI profiles would intersect at zero distance from the center. The central $\pm 20\text{mm}$ of every profile is through the unit‐density sphere, while the rest is through the lung material.