Table 3.

Technical differences and measured width of BCNC in the previous studies in normal hearing and bilateral SNHL.

	Imaging protocol	Slice chosen	Measurement	Width (mm) in control	Width (mm) in bilateral SNHL
Fatterpekar et al. [3]	Parallel to the infraorbitomeatal line	Slice at oval window	Manual measurement along the inner margin of its bony walls at its midportion	2.13 ± 0.44 (N = 50 ears)	1.82 ± 0.24 in profound bilateral SNHL (N = 33 ears)
Komatsubara et al. [10]	30° downward to the orbitomeatal line	Slice with maximum width	Digital measurement at midline between two straight lines drawn on the fundus of the IAC and the base of the modiolus	1.91 ± 0.27 (N = 100 ears)	0.99 ± 0.37 (with CND) 1.73 ± 0.32 (with developed cochlear nerve)
Kono [11]	Parallel to the infraorbitomeatal line	n.a	Measurement at the base of the modiolus	2.1 ± 0.2 (N = 118 ears)	n.a
Stjernholm et al. [2]	Temporal bone cast using silicone rubber	n.a	Measurement in axiopetrosal plane	2.58 ± 0.31 (N = 117 ears)	n.a
	Parallel to the infraorbitomeatal line	Slice at posterior semicircular canal	Measurement along the inner margin of its bony walls at its midportion	1.91 ± 0.24 (N = 100 ears)	n.a
Pagarkar et al. [12]	Direct scanning in axial plane spiral with a pitch of 1	Slice with maximum width	Maximum width was measured to the nearest 0.1 mm	1.9 ± 0.7 (N = 19 ears)	1.0 ± 0.2 (N = 8 ears)
Teissier et al. [13]	Parallel to the lateral semicircular canal	Slice containing the cochlear modiolus, the oval window	Measurement at the entry of the cochlea	2.16 ± 0.24 (N = 174 ears)	2.12 ± 0.55 (N = 120 ears)

BCNC: bony cochlear nerve canal; SNHL: sensorineural hearing loss; n.a: not available.