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Creating AFNI Datasets with Program to3d
¥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
