Clinical role of fast-spin echo MRI of the temporal bone in inner ear dysfunction
To assess the clinical effectiveness of high-resolution fast spin-echo (FSE) MRI in the study of the normal and pathological cochleovestibular and neural structures, we examined 19 patients with clinically diagnosed inner ear dysfunction. Contiguous interleave 3-mm-thickness axial and coronal T2-weighted images were obtained by using 16 echo train length (ETL) and FSE with surface dual temporomandibular at joint 1.5 T. Imaging parameters were as follows: TR 4500 ms, effective TE 100 ms, 2 excitations field of view 16 cm, and 512 matrix. Fine inner ear structures including the osseous spiral lamina and labyrinthine segment of the facial nerve were exceptionally shown in all cases. Bundles of the cochlear and vestibular branches of the acoustic nerve were resolved in 79-92%: cochlear branch 92% (35/38), 79% (30/ 38) on axial and coronal images; superior vestibular branch 89 % (34/38) on coronal images; inferior vestibular branch 82% (31/38) on axial images respectively. The vestibular aqueduct was also visualised in 16% (6/38) on axial images only. Five patients were shown to have inner ear pathology, including 2 intracanalicular acoustic schwannomas, 2 congenital anomalies and 1 labyrinthitis.
Key wordsTempral bone Magnetic resonance imaging
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