The accuracy of the registration was established by measuring displacement of the 80 landmarks in each registered brain from the same landmarks in the reference brain.
The salience values are used to identify most salient landmarks in each scene on the path of wayfinding.
Let the 3P×1 matrix (bar {mathbf {s}}) be the mean shape and the 3P×K matrix V and the K-dimensional vector z t be the remaining basis shapes and their weights, respectively, where P is the number of landmarks in each image frame and K the number of articulation shapes apart from the mean shape.
The measured area in each hemisphere was correctly positioned by using the nasion, vertex, and pre-auricular points as skull landmarks in each infant.
To compute the symmetry and asymmetry components of the shape space, it is useful to distinguish the landmarks in the centre of rotation (or on the axis of rotation for 3D data) from the landmarks in each sector.
The software automatically detects 44 stable anatomical landmarks in each thoraco/abdominal/pelvic CT-scan, sets up a patient specific coordinate-system and cross-links the coordinate-systems of consecutive CT-scans.
Care was taken to obtain accurate apical images using standard anatomic landmarks in each view and not foreshorten the atrial chambers, allowing a more reliable delineation of the atrial endocardial border.
