Table 5. DMA at the six combined cartilage-to-bone models, i.e., from the three CT bone models and the two MRI cartilage models; registration was obtained by the talus model via ICP. Both the surfaces of the cartilage, toward the talus (top) and toward the tibia (bottom) are reported.

Variable	Max distance (+)	Max distance (−)	Mean distance	SD	RMS
Cartilage toward talus
STCT + MRI 1.5 T	6.0	−1.2	1.7	1.8	2.5
STCT + MRI 3 T	3.6	−2.0	0.3	1.3	1.3
DECT + MRI 1.5 T	6.0	−1.2	1.7	1.8	2.5
DECT + MRI 3 T	3.6	−2.2	0.3	1.3	1.3
CBCT + MRI 1.5 T	6.0	−0.9	2.0	1.8	2.6
CBCT + MRI 3 T	4.0	−1.4	0.7	1.3	1.5
Cartilage toward tibia
STCT + MRI 1.5 T	6.0	−1.8	1.5	1.9	2.4
STCT + MRI 3 T	6.0	−0.6	0.9	1.5	2.4
DECT + MRI 1.5 T	6.0	−4.6	0.0	2.3	2.3
DECT + MRI 3 T	6.0	−1.0	1.5	1.6	2.2
CBCT + MRI 1.5 T	6.0	−1.2	1.9	1.8	2.6
CBCT + MRI 3 T	6.0	−0.2	2.2	1.6	2.7

Measurements are in mm. DMA, distance map analysis; ICP, iterative closest point; STCT, standard CT; DECT, dual energy CT; CBCT, cone-beam CT; SD, standard deviation; RMS, root mean square; CT, computed tomography; MRI, magnetic resonance imaging.