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Hello,
I'm interested in locating the MGN and LGN using
segmentationThalamicNuclei, but there seems to be a mismatch between the
location I obtain in the discrete segmentation and the underlying
probability maps obtained by setting environment variable
WRITE_POSTERIORS to 1. While the LGN segmentation (orange and dark blue
below) has many voxels within the corresponding area of maximum
probability (superimposed hot color scale thresholded at p>0.2 below),
the MGN is almost absent from the discrete segmentation (or way too
lateral/posterior/superior relative to its area of max probability to be
seen in the screen shot below). Any reason why this could be happening?
Is there anything I can do (parameters I can change) to fix this?
The defaut Freesurfer segmentation ("thalamus proper", shown in white
below) is generally larger than the segmentation output by
segmentThalamicNuclei, except in the area of the LGN, where the thalamic
segmentation extends more laterally/inferiorly, as if it had been
extended in order to include the LGN (although imperfectly). However,
this does not seem to be happening for the MGN (which is my primary area
of interest).
(Note that I'm using T1-weighted MPRAGE data at a resolution of 0.7 mm
isotropic)