Table 1.

The 3D-affine registration corrects for rigid-body subject motion and 3D eddy currents (see Mohammadi et al., 2010). The slice-wise registration was preceded by a rigid-body registration to reduce 3D shifts in the x- and y-direction, and 3D scaling in the y-direction.

Registration method	Translation	Rotation	Scaling	Shearing	Number of parameters
3D-affine	x-, y-, and z- direction	x-, y-, and z- axis	x- and y- direction	x-y plane and z-y plane	9
Rigid-body	x- and y-direction	None	y-direction	None	3
Slice-wise	x- and y-direction	None	y-direction	None	24a

^aDue to poor data quality and edge effects, the first and last slices were not included in the slice-wise registration method, yielding 8 × 3 parameters.