¥to3d reads image
files -- each containing 1 or more 2D slices -- and assembles them into AFNI
datasets
¥The collection of all the 2D
slice data forms the .BRIK file
HAn AFNI dataset can
contain a single slice
¥You must also provide to3d with some auxiliary data (for the .HEAD file):
HOrientation of
slices in space
HSize of slices or of
the voxels
HSlice offset --
where is the dataset volume located in space?
HFor 3D+time
datasets, you also need slice timing information
Hto3d ÔknowsÕ how to get some of this auxiliary information
from image file headers for some image
file formats:
åANALYZE
7.5 .hdr/.img
pairs contain voxel size information
åSiemens
.ima Files
contain voxel size and orientation information
åGE I.
Files contain voxel size and orientation information
åDICOM
Files contain lots of relevant information
íBut
manufacturersÕ variations on DICOM are frustrating