Surface Atrophy Depth meausrement.

Added User Interface function "MainMenu>Brain>Measure Surface Atrophy depth"

Two longitudinal timepoints Time0 (2009) and Time2 (2011)  of the same patient's brain were processed.

Step 1.
Brain Mask was extracted using FireVoxel\EdgeWave (after non-uniformity correction using FireVoxel BiCal).

Step 2.
Two Brain Masks were then registered using the Rigid Transform so they are overlaid in the same coordinate system of the Time2











Step 3.  For the Brain Mask of the earlier volume (Time0) we calculated the depth from the Surface into the brain (measured in 0.01 mm).


Step 4.  That "Depth from the surface" map of Time0, was then projected onto the surface-only  BrainMask of Time2.  Thus the surface values of the "Atrophy Depth map" were constructed.
One projection was rendered using the primitive rendering ability of the FireVoxel.

Depth of Surface atrophy (in 0.01 mm). Transparent voxels are due to FireVoxel's rudimentary volume rendering.

As a next step would try to regenerate the surface using better volume rendering tools.