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aim to even out angles between neighboring triangles while, optionally, trying to
preserve triangle angles or area and starting a relaxation process, the cortex can be
inflated [37] (see Figure 12.10). If portions of the cortical mesh are cut before start-
ing the process, flattening is possible as well.
12.1.5.3 Talairach Coordinates and Brodmann Areas
By coregistering MRI data with a functional or anatomical atlas, source locations
may be linked to Brodmann areas or anatomical features. The most common
atlas-based coordinate system is the one introduced by [38]. Here, the brain is
divided into 12 sections defined by the anterior commissure, the posterior
commissure, the interhemispheric fissure, and the extent of the brain in each of the
(a)
(b)
(c)
Figure 12.10
(a, b) Three-dimensional rendering of cortex with CDR result on sulcal wall (a) before
and (b) after inflation. (c) Fitted dipole, Brodmann area 44 according to [38], and information win-
dow (containing Talairach coordinates, image data intensity, distance from a predefined reference
location, magnification factor, and anatomical and functional areas), overlaid onto MRI.
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