RT Journal Article
SR Electronic
T1 Identification of the Nervus Intermedius Using 3T MR Imaging
JF American Journal of Neuroradiology
JO Am. J. Neuroradiol.
FD American Society of Neuroradiology
SP 460
OP 464
DO 10.3174/ajnr.A2338
VO 32
IS 3
A1 H.P. Burmeister
A1 P.A. Baltzer
A1 M. Dietzel
A1 I. Krumbein
A1 T. Bitter
A1 A. Schrott-Fischer
A1 O. Guntinas-Lichius
A1 W.A. Kaiser
YR 2011
UL http://www.ajnr.org/content/32/3/460.abstract
AB BACKGROUND AND PURPOSE: Improved MR imaging at higher field strengths enables more detailed imaging of cranial nerves. The aim of this study was to assess the identifiability of the NI in the CPA and IAC by using high-resolution 3T MR imaging. MATERIALS AND METHODS: Twenty-seven healthy volunteers (13 men and 14 women; mean age, 33 years) underwent 3T MR imaging of the CPA. The section thicknesses of the CISS sequence was 0.4 mm (TR, 12.18 ms; TE, 6.09 ms) using a 12-channel head coil. Evaluation was performed by using MPR mode. Image quality and identifiability of the NI were rated independently by 2 observers according to predefined criteria on an ordinal scale. Interobserver agreement was assessed by κ statistics. RESULTS: Fifty-four NIs were evaluated. Both observers were able to identify the NI in nearly 60% of cases. It was possible to indentify at least 1 NI in 70% of all volunteers in the CPA and/or IAC. Image quality ratings showed a substantial agreement (κ = 0.65) and identifiability ratings an almost perfect (κ = 0.83) agreement. CONCLUSIONS: Careful evaluation of all nervous and vascular structures in the CPA and IAC at high-resolution 3T MR imaging allows reliable depiction of the NI. AanteriorCISSconstructive interference in steady stateCNnervus cochlearisCPAcerebellopontine angleFNnervus facialisIinferiorIACinternal auditory canalMPRmultiplanar reconstructionNInervus intermediusPposteriorSsuperiorSNRsignal intensity–to-noise ratioVInervus vestibularis inferiorVSnervus vestibularis superior