I have noticed that applyxfm4d always uses the slow sinc interpolation
method. It would be nice if this tool allowed the user to optionally specify
other interpolations (e.g. trilinear would be much faster and appropriate
for situations like Russ Poldrack's ROI tools). Does anyone know whether
there is a way to transform a 4D volume using a 4x4 transformation matrix
without using sinc interpolation?