Figure 1.

Group mean, systematic, and random error estimates between setup with laser alignment alone versus with cone-beam computed tomography (CBCT) in pediatric central nervous system (CNS) image-guided radiotherapy. A, Group mean error and 95% confidence intervals. B, Estimates of systemic and random error estimates. Table shifts between laser alignment and CBCT were measured in transverse = x, superior–inferior (SI) = y, and anterior–posterior (AP) = z translational directions. Vector magnitude (VM) was calculated as √(x ² + y ² + z ²).