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.