Mass Screening for Retrocochlear Disorders: Low-Field-Strength (0.2-T) versus High-Field-Strength (1.5-T) MR Imaging

Frédérique Dubrulle; Julia Delomez; Alireza Kiaei; Pierre Berger; Christophe Vincent; François-Michel M. Vaneecloo; Laurent Lemaitre

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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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TABLE 1:
Comparative results for observer 1
Findings at 1.5 T
Findings at 0.2 T Retrocochlear Disorder No Retrocochlear Disorder Total
Positive 58^* 0 58
Negative 5 218 223
Total 63 218 281
Note.—Concordance κ value = 0.95.
↵* Of these, 57 were positive, and one was uncertain.
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TABLE 2:
Comparative results for observer 2
Findings at 1.5 T
Findings at 0.2 T Retrocochlear Disorder No Retrocochlear Disorder Total
Positive 58^* 1^† 59
Negative 5 217 222
Total 63 218 281
Note.—Concordance κ value = 0.93.
↵* Of these, 51 were positive, and seven were uncertain.
↵† This finding was uncertain.

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TABLE 3:

Comparative results according with clinical groups

Result	Group 1(n = 33)	Group 2(n = 153)	Group 3(n = 74)	Group 4(n = 21)
Findings on 1.5-T images
Total disorders	21 (63.6)	27 (17.6)	3 (4.1)	12 (57.1)
Tumoral disorders	20 (60.6)	27 (17.6)	3 (4.1)	6 (28.6)
Nontumoral disorders	1 (3.0)	0 (0)	0 (0)	6 (28.6)
Findings on 0.2-T images
Total disorders	21 (63.6)	27 (17.6)	3 (4.1)	7 (33.3)
Tumoral disorders	20 (60.6)	27 (17.6)	3 (4.1)	6 (28.6)
Nontumoral disorders	1 (3.0)	0 (0)	0	1 (4.8)