Table 1.

Disc levels possible to assess with 1.5 and 3 T MRI

Evaluated level	Sagittal T2	Axial Medic 2	Axial T2a	Sagittal T2	Axial T2	Oblique T2	Oblique T2
	1.5 T	1.5 T	1. 5 T	3 T	3 T	1.5 T	3 T
N	10	10	1	10	10	10	10
Adjacent upper level	10	10	1	10	10	10	10
Operated level spinal cord	0	0	0	0	0	–	–
Disc	0	0	0	0	0	–	–
Right foramen	–	0	1	–	1	1	0
Left foramen	–	0	1	–	2	3	1
Adjacent lower level	10	10	1	10	10	10	10

The number indicating how many adjacent upper and lower levels and operated level spinal cord, disc, right and left foramina that was possible to evaluate with the different imaging sequences

N number of patients, – not evaluated

^a T2 axial 1.5 T was only performed in one patient and the root canals were evaluable at operated level in this patient