File:Human visual cortex V1.png

English: (B) Ultra high-resolution (0.4 mm)3 FLASH MR image covering the occipital lobe of a living subject (female, 27 years) shown in coronal (top) and axial (bottom) view. In the left hemisphere the well depicted Stria of Gennari (arrowheads) can be seen, whereas in the right hemisphere results of an automatic clustering algorithm are shown. Cortical surfaces were reconstructed on the basis of a high-resolution T1-weighted image (not shown) using a level-set approach. Additional transcortical profiles were computed perpendicular to the isosurfaces of the level-set function. Sampling the FLASH data along these profiles extracts laminar fingerprints for each point on the cortical surface that can be interpreted as feature vectors in a multi-dimensional space. Feeding those into an automatic k-means clustering algorithm parcellates the cortex into areas of similar laminar structure. The green cluster indicates the area containing the Stria of Gennari and marks the primary visual cortex (V1). CF = calcarine fissure. (C) The same cluster as in (B) is mapped onto an intermediate (∼1.5 mm from gray/white matter border) cortical surface. The medial surface (left) and the occipital pole (right) are shown.