Commit 4b2fae25 authored by Paul McCarthy's avatar Paul McCarthy 🚵
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DOC: Note on fnirt deformation fields

parent 56bf8834
...@@ -82,6 +82,12 @@ the reference image, and may contain: ...@@ -82,6 +82,12 @@ the reference image, and may contain:
the source image coordinates which correspond to those reference image the source image coordinates which correspond to those reference image
coordinates. coordinates.
.. note:: FNIRT deformation field files give no indication as to whether they
contain relative displacements or absolute coordinates, so heuristics
must be used to infer what is stored in a a particular file. The
:func:`.nonlinear.detectDeformationType` function can be used to
determine whether a file contains relative displacements or absolute
coordinates.
If an initial linear registration was used as the starting point for FNIRT, If an initial linear registration was used as the starting point for FNIRT,
this is encoded into the displacements/coordinates themselves, so they can be this is encoded into the displacements/coordinates themselves, so they can be
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