3D Rigid Registration of Intraoperative Ultrasound and Preoperative MR Brain Images Based on Hyperechogenic Structures

Table 1

Manual estimation of the initial error in mm (i.e., error of the registration given by the neuronavigation system).

A priori estimation of the registration: initial error in mm
Mean (std)	Expert 1	Expert 2	Expert 3	𝑃 value
Patient 1	5.52 (1.15)	4.31 (1.55)	5.00 (1.50)	0.30
Patient 2	8.64 (0.89)	8.31 (1.24)	8.76 (1.04)	0.69
Patient 3	3.56 (1.09)	4.61 (1.39)	4.38 (1.13)	0.13