Article Figures & Data
Figures
- Fig 1.
Para-axial CISS sequence image (TR, 12.18 ms; TE, 6.09 ms; flip angle, 50°) of the CPA at 3T depicting the infrequent finding of an approximate symmetric course of the NI: 1) nervus facialis; 2) nervus intermedius; 3) nervus vestibulocochlearis; 4) loop of the anterior inferior cerebellar artery between the origin of 1 and 2; 5) loop of the anterior inferior cerebellar artery dorsal of the nervus intermedius; 6) lateral semicircular canal; and 7) brain stem.
- Fig 2.
Parasagittal reformatted CISS sequence images (1–6) (TR, 12.18 ms; TE, 6.09 ms; flip angle, 50°) of the CPA and IAC at 3T depicting the course of the NI and additional reference images on the right: 1) NI originates (white arrows) anterior to the nervus vestibularis superior from the brain stem, 2) NI in the middle third of the CPA between the nervus facialis (anterior) and vestibularis superior (posterior), 3) NI in the distal third of the CPA between the nervus facialis (anterior) and vestibularis superior (posterior), (4) loop of the anterior inferior cerebellar artery in the proximal IAC slightly elevating the NI, (5) NI in the middle third of the IAC between the nervus facialis (anterior) and vestibularis superior (posterior), and 6) NI in the distal third of the IAC attached to the nervus facialis (anterior). Reference pictures: upper row, para-axial CISS sequence image with dotted reference lines for images; 1–6, lower row, schematic drawing of the order of nerves (clockwise direction) in the IAC.
- Fig 3.
The intermediate position of the NI in the middle third of the IAC (TR, 12.18 ms; TE, 6.09 ms; flip angle, 50°). Semi-thin anatomic section of the left IAC (A) and a correlating parasagittal in vivo CISS sequence image (B) (TR, 12.18 ms; TE, 6.09 ms) at 3T depicting the nervus facialis (1), nervus intermedius (2), nervus vestibularis superior (3), nervus vestibularis inferior (4), hook of the nervus cochlearis (5), and the nervus cochlearis (6).
Tables
Image Quality Observer B Total % A 0 1 2 Observer A 0 1 0 0 1 1.9 1 2 12 2 16 29.6 2 0 5 32 37 68.5 Total 3 17 34 54 100 % B 5.5 31.5 63.0 100 -
a 0 indicates insufficient; 1, adequate; 2, excellent.
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Identifiability Observer B Total % A 0 1 2 Observer A 0 22 1 0 23 42.6 1 1 9 2 12 22.2 2 0 2 17 19 35.2 Total 23 12 19 54 100 % B 42.6 22.2 35.2 100 -
a 0 indicates none; 1, adequate; 2, precise.
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