Screening protocol for MR imaging of the internal auditory canal.

Abstract:

:We have previously shown that 5 mm axial T1-weighted images following Gd-diethylenetriamine pentaacetic acid (DTPA) administration were sufficient as a screening examination of the internal auditory canal (IAC) and cerebellopontine angle cistern in 80% of cases with sensorineural hearing loss. In the remaining 20% of cases 3 mm slices were necessary for confirmation of the diagnosis. To reduce the number of cases requiring the additional examination, we have modified our protocol to include a coronal "scout" T1-weighted sequence followed by 5 mm axial sections angled through the IACs. Routine axial T2-weighted images of the posterior fossa were also obtained. One hundred eleven patients were studied with this protocol. In all but two of these the 5 mm sections unequivocally provided the diagnosis and in those two cases the coronal images confirmed the diagnosis suspected on the axial study. Three millimeter slices were not necessary in any patient. This three sequence, post-Gd-DTPA protocol, which requires only 12 min of scan time, is recommended as a screening protocol for IAC and cerebellopontine angle disease.

journal_name

J Comput Assist Tomogr

authors

Litt AW,Mirsky P,Berson BD,Kricheff II

doi

10.1097/00004728-199111000-00004

subject

Has Abstract

pub_date

1991-11-01 00:00:00

pages

930-3

issue

6

eissn

0363-8715

issn

1532-3145

journal_volume

15

pub_type

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