Projects:DBP2:Harvard:Registration Documentation:Compare
UNDER CONSTRUCTION
This page aims to create a concise comparison of registration methods to show the difference in quality of registration between FSL 4.1 and Slicer 3.3.
Other types of registrations and a link to the files used can be found here.
Note: for FSL all files need to be in nifti format. For me, FSL was interpreting my masked baseline image strangely so I had to flip the nrrd before converting to nifti using unu flip. If trying this yourself, view your nifti files in FSL before registration to see if they are oriented properly if you encounter problems.
T2 to Baseline registration
In this registration we take a masked T2 image as our source, and register it to the corresponding masked baseline image target using FSL's FLIRT and FNIRT tools, and in Slicer 3 by the Registration -> Rigid Registration and Registration -> Deformable BSpline Registration modules.
Rigid
Rigid registration is very similar between the two tools. Differences are only visible when switching back and forth in slicer. The Slicer registration seems slightly more diffuse, but both seem to be properly aligned for further bspline registration.
