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Hi Karen, The structures supported by FIRST were hand-labelled in 336 T1 images. For each structure, a 3D mesh representation was generated, along with the variation across all of the subjects at each vertex. These 3D meshes (which can be found in $FSLDIR/data/first/models_336_bin/) are used as the basis for the FIRST segmentations. So they are effectively the "atlas" used by FIRST to drive the segmentation. Cheers, Paul On 03/05/2019, Karen Seymour <[log in to unmask]> wrote: > FSL experts, > > I have done some reading, but can't seem to find any information about the > specifics for the atlas/labelling used in FIRST. Specifically, I know that > FIRST models were trained for 15 the different subcortical structures using > 336 manually-labelled T1-weighted MR images, but what atlas is being used > for the labels or is it its own atlas? > > Karen > > ######################################################################## > > To unsubscribe from the FSL list, click the following link: > https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=FSL&A=1 > ######################################################################## To unsubscribe from the FSL list, click the following link: https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=FSL&A=1