Jl. Ostuni et al., ANALYSIS OF INTERPOLATION EFFECTS IN THE RESLICING OF FUNCTIONAL MR-IMAGES, Journal of computer assisted tomography, 21(5), 1997, pp. 803-810
Purpose: Typically, the final step in volume registration is the resli
cing of the volume of interest. The purpose of this work is to examine
the effects of this reslicing on functional MRI (fMRI) data using dif
ferent interpolation methods. Method: Functional whale-brain echo plan
ar imaging (EPI) volumes were resliced using six different interpolati
on methods: trilinear, tricubic splines, and a 3D sine function using
a rectangular and a Hanning window, both with half-window lengths of 3
and 4 voxels. Results: Interpolation by tricubic spline and 3D sine u
sing a Hanning window had comparable errors, although tricubic spline
interpolation was computationally the fastest. Interpolation by trilin
ear and 3D sine using a rectangular window had relatively large errors
, although the speed of trilinear makes it desirable for some applicat
ions. Conclusion: Interpolations using all of the tested methods adver
sely affected the fMRT data, although these effects differed for each
method.