Mass Screening for Retrocochlear Disorders: Low-Field-Strength (0.2-T) versus High-Field-Strength (1.5-T) MR Imaging
Frédérique Dubrullea,
Julia Delomeza,
Alireza Kiaeib,
Pierre Bergera,
Christophe Vincentb,
François-Michel M. Vaneecloob and
Laurent Lemaitrea
a Department of Radiology, Hopital Huriez, Centre Hospitalier Universitaire de Lille, France
b Department of Neurology, Hopital Huriez, Centre Hospitalier Universitaire de Lille, France
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FIG 1. Axial contrast-enhanced T1-weight-ed MR images show a small vestibular schwannoma.
A, The 1.5-T image (550/20/3) obtained at the level of the IAC shows a small (2-mm) left vestibular schwannoma in the fundus of the IAC.
B, The 0.2-T image (650/15/3) obtained at the same level depicts the small vestibular schwannoma.
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FIG 2. Axial contrast-enhanced T1-weight-ed MR images show an intra-labyrinthine schwannoma.
A, The 1.5-T image (550/20/3) shows a posterior enhancement of the right labyrinth (arrow), which corresponds to a schwannoma in the vestibule.
B, The 0.2-T image (650/15/3) obtained at the same level depicts this intravestibular schwannoma (arrow).
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FIG 3. Axial contrast-enhanced T1-weight-ed MR images show meningeal enhancement in the IAC.
A, The 1.5-T image (550/20/3) obtained at the level of the IAC shows contrast enhancement in the left IAC, with concave limits corresponding to a meningeal enhancement (arrow).
B, The 0.2-T image (650/15/3) shows no contrast enhancement in the left IAC (arrow).
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FIG 4. Axial contrast-enhanced T1-weight-ed MR images show enhancement of the facial nerve.
A, The 1.5-T image (550/20/3) shows contrast enhancement of the second portion of the right facial nerve.
B, The 0.2-T image (650/15/3) depicts no significant contrast enhancement at this level.
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