Fig 1.
DUONTM immobilization masks were used to fix the head in the translational (lateral, longitudinal, and vertical) and rotational (pitch, roll, and yaw) dimensions.
Table 1.
Characteristics of the Patients in the Study.
Fig 2.
Image Registration Using kV Tubes 1 and 2 with BrainLAB ExacTrac for Patient #2.
(a) DRR image, (b) ExacTrac image, and (c) image registration.
Fig 3.
Inter-fractional Setup Variations (mean ± SD) for the 28 Patients.
Setup errors in the (a) lateral (x-axis, left to right), (b) longitudinal (z-axis, superior to inferior), (c) vertical (y-axis, anterior to posterior), (d) pitch, (e) roll, and (f) yaw dimensions.
Fig 4.
Histograms and Normalized Curves for the Translation and Rotational Variations.
Setup errors in the (a) lateral (x-axis, left to right), (b) longitudinal (z-axis, superior to inferior), (c) vertical (y-axis, anterior to posterior), (d) pitch, (e) roll, and (f) yaw dimensions.
Table 2.
Systematic (Σ) and Random (σ) Errors in the Translational and Rotational Dimensions.
Table 3.
Calculated CTV to PTV Margins Proposed by Stroom et al.’s [21] and van Herk et al.’s [22, 24] Formulas Based on the Systematic (Σ) and Random (σ) Errors.
Fig 5.
Spearman Correlation Analysis between the 3D Vector [mm] and PTV Volume [cm3].
*Spearman correlation coefficient ρ = -0.004; p value = 0.985; R2 = 0.005