Fig 1.
Image of the patient setup with ExacTrac frameless radiosurgery positioning array (BrainLAB AG, Feldkirchen, Germany).
Table 1.
Patient characteristics and treatments included.
Fig 2.
Image registration using kV tube 1 and tube 2 with the BrainLAB ExacTrac for patient #18.
(a) DRR image; (b) ExacTrac image; and (c) image registration.
Fig 3.
Image registration using planning computed tomography (CT) and cone-beam computed tomography (CBCT) for patient #18 with offline 6D fusion in offline review.
(a) Axial planes; (b) Coronal planes; and (c) Sagittal planes.
Fig 4.
Histogram and normalized curves for the translational and rotational variations between the 6D ExacTrac and the 3D cone-beam computed tomography (CBCT).
(a) Lateral (x-axis); (b) longitudinal (z-axis); (c) vertical (y-axis); and (d) yaw dimensions.
Fig 5.
Histogram and normalized curves for the translational and rotational variations between the 6D ExacTrac and the 6D cone-beam computed tomography (CBCT).
(a) Lateral (x-axis); (b) longitudinal (z-axis); (c) vertical (y-axis); (d) pitch; (e) roll; and (f) yaw dimensions.
Fig 6.
Histogram and normalized curves for the translational and rotational variations between the 3D CBCT and the 6D CBCT.
(a) Lateral (x-axis); (b) Longitudinal (z-axis); (c) Vertical (y-axis), and (d) Yaw dimensions.
Table 2.
Residual setup errors and differences among the 6D ExacTrac, 3D cone-beam computed tomography (CBCT), and 6D CBCT when used for intracranial stereotactic radiosurgery (N = 107, n = 138).
Residual setup errors reported by Ma et al. [10] and Chang et al. [12] are also shown.
Fig 7.
Box and whisker plots of the translational variations in the lateral, longitudinal, and vertical directions with 6D ExacTrac, 3D cone-beam computed tomography (CBCT), and 6D CBCT.
Fig 8.
Box and whisker plots of the rotational variations in the pitch, roll, and yaw directions with 6D ExacTrac, 3D cone-beam computed tomography (CBCT), and 6D CBCT.
Fig 9.
Box and whisker plots of the translational difference variations in the lateral, longitudinal, and vertical directions for the 6D ExacTrac vs. 3D cone-beam computed tomography (CBCT), 6D ExacTrac vs. 6D CBCT, and 3D CBCT vs. 6D CBCT.
Fig 10.
Box and whisker plots of the rotational difference variations in the pitch, roll, and yaw directions for the 6D ExacTrac vs. 3D cone-beam computed tomography (CBCT), 6D ExacTrac vs. 6D CBCT, and 3D CBCT vs. 6D CBCT.