²3D viewing angles:
å Roll = angle about I-S axis
å Pitch =
angle about L-R axis (after roll rotation)
å Yaw = angle about A-P axis (after roll and pitch)
²Rendering is CPU and memory intensive --- a fast
computer is very desirable
¥Utility program 3dIntracranial can be used to strip the scalp off of a T1-weighted anatomical volume. In some cases, this may need to be done with the orig dataset, which may then
be written out in Talairach coordinates.
²For example:
² 3dIntracranial -anat anat+tlrc -prefix
astrip
¥AFNI can now render datasets that are stored with an
arbitrary orientation and voxel size
²Datasets are internally re-oriented (see 3dresample) to axial slice order, so that cut directions make sense. This may take a few seconds, depending
on the computer.
²Note that axial slice order is the standard for ÔwarpedÕ
datasets written out to disk in +acpc or +tlrc coordinates.
²The Overlay dataset may also be resampled, so that its
grid spacing matches that of the Underlay
dataset.