The origin of the coordinate system is located at the midpoint of the connecting line between the landmarks of the LIA and RIA. The x-axis points from RIA to LIA. The y-axis is defined as the direction perpendicular to the x-axis in the transverse section and from back to front. The z-axis is defined as a top-down direction perpendicular to the transverse section. The unit of each coordinate axis is the millimeter, which was chosen to eliminate the influence of different resolutions in three dimensions.
Landmark-Based Coordinate System for 3D Image Registration
The origin of the coordinate system is located at the midpoint of the connecting line between the landmarks of the LIA and RIA. The x-axis points from RIA to LIA. The y-axis is defined as the direction perpendicular to the x-axis in the transverse section and from back to front. The z-axis is defined as a top-down direction perpendicular to the transverse section. The unit of each coordinate axis is the millimeter, which was chosen to eliminate the influence of different resolutions in three dimensions.
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Corresponding Organization : Sun Yat-sen University Cancer Center
Variable analysis
- Number of landmarks used (6 landmarks)
- Parameters for 3D image registration
- Spatial relationship between landmarks
- Positions of landmarks (right/left internal acoustic pore, right/left ascending segment of the internal carotid artery in the posterior cavernous sinus)
- Symmetry and planarity of the 4 landmarks
- Location of posterior clinoid (PC) process and midpoint of the upper edge of the anterior arch of C1 (MC) landmarks
- Unit of coordinate axis (millimeter)
- Use of 4 landmarks in the transverse section (right/left internal acoustic pore, right/left ascending segment of the internal carotid artery in the posterior cavernous sinus)
- Not applicable (no negative controls mentioned)
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