Fig. 4.

Absolute distance error between the registered subject and template skulls mapped onto the subject skull model with corresponding error bar

a Normal skull

b Craniosynostosis skull

c The lower ROI mapped onto the template skull (all 8 months old).

Highest error occurs in the fontanel region due to the anatomical mismatch between the subject and template models, hence we rely on $95\mathrm{th}$ percentile distance instead of the maximum distance. The normal skull has better alignment compared with the craniosynostosis skull. Also the errors are larger in the upper region compared with the stable lower regions which are used for registration