Sections and renderings of an averaged human brain.
The false color composite volume is constructed from MRI
data, with each contrast represented in separate color channels. The weighted image values are non-linearly scaled to emphasize various aspects of human brain anatomy.
MRI provides a 3-D map of hydrogen nuclei, mostly within water molecules, weighted by nuclear spin relaxation rates. Different weighting provides slightly different information about the density and molecular environment of hydrogen nuclei.
The averaged data is from the ICBM 152 Nonlinear atlases version 2009
, a set of volumetric data constructed from non-linearly coregistered averages from MRI volumes of 152 subjects.
Some documentation of the color volume construction
This image is dedicated to the Public Domain. There are no restrictions on use. Claiming to be the originator or owner, explicitly or implicitly, is bad karma. A link (if appropriate), a note to firstname.lastname@example.org, and credit are appreciated but not required.