Table 2.
Spaces and transforms used in the dHCP neonatal fMRI pipeline. Superscript (-1) refers to the inverse of the transform.
| Spaces | ||
|---|---|---|
| functional (func) | Native multiband EPI space | |
| sbref | Native single-band EPI reference space | |
| structural (struct) | Native T2w space | |
| fieldmap (fmap) | Derived fieldmap space | |
| template | dHCP 40-week template space | |
| Primary registrations | Degrees of freedom | |
| (a) | fieldmap-to-structural | rigid |
| (b) | sbref-to-structural | rigid |
| (c) | functional-to-sbref (distorted) | rigid |
| (d) | functional-to-sbref (undistorted) | rigid |
| (e) | template-to-structural | nonlinear |
| Composite registrations | ||
| (a) ⊕ (b)−1 ⊕ (c)−1 | fieldmap-to-functional | rigid |
| (d) ⊕ (b) | functional-to-structural (undistorted) | rigid |
| (d) ⊕ (b) ⊕ (e)−1 | functional-to-template (undistorted) | nonlinear |