MR imaging of the inner ear: comparison of a three-dimensional fast spin-echo sequence with use of a dedicated quadrature-surface coil with a gadolinium-enhanced spoiled gradient-recalled sequence.

“…For the cochlear aqueduct, scores at 1 min were low and the differences in scores between 1 and 270 min were Introduction Various reports concerning the usefulness of high-resolution T2-weighted images acquired using 3D fast imaging with steady-state precession (FISP) [1], 3D steady-state free precession (SSFP) [2], 3D constructive interference in the steady state (CISS) [3,4], 3D true FISP [5], and 3D fast asymmetric spin-echo (FastASE) [6,7,8] sequences have been published in the field of temporal bone imaging. However, with regard to contrast-enhanced T1-weighted images, a 2D conventional spinecho sequence with a slice thickness of 2-3 mm and gaps between slices or a 3D spoiled gradient-echo sequence (3D SPGR) with a slice thickness of 0.6-1.8 mm has usually been employed [7]. Small structures in the temporal bone are surrounded by bone and air, and a high-resolution spin-echo-based 3D T1-weighted sequence has long been desired, especially for the assessment of contrast enhancement of the cochlear perilymph fluid [9].…”

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confidence: 99%

High-resolution T1-weighted 3D real IR imaging of the temporal bone using triple-dose contrast material

et al. 2003

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The small structures in the temporal bone are surrounded by bone and air. The objectives of this study were (a) to compare contrast-enhanced T1-weighted images acquired by fast spin-echo-based three-dimensional real inversion recovery (3D rIR) against those acquired by gradient echo-based 3D SPGR in the visualization of the enhancement of small structures in the temporal bone, and (b) to determine whether either 3D rIR or 3D SPGR is useful for visualizing enhancement of the cochlear lymph fluid. Seven healthy men (age range 27-46 years) volunteered to participate in this study. All MR imaging was performed using a dedicated bilateral quadrature surface phased-array coil for temporal bone imaging at 1.5 T (Visart EX, Toshiba, Tokyo, Japan). The 3D rIR images (TR/TE/TI: 1800 ms/10 ms/500 ms) and flow-compensated 3D SPGR images (TR/TE/FA: 23 ms/10 ms/25 degrees) were obtained with a reconstructed voxel size of 0.6 x 0.7 x 0.8 mm3. Images were acquired before and 1, 90, 180, and 270 min after the administration of triple-dose Gd-DTPA-BMA (0.3 mmol/kg). In post-contrast MR images, the degree of enhancement of the cochlear aqueduct, endolymphatic sac, subarcuate artery, geniculate ganglion of the facial nerve, and cochlear lymph fluid space was assessed by two radiologists. The degree of enhancement was scored as follows: 0 (no enhancement); 1 (slight enhancement); 2 (intermediate between 1 and 3); and 3 (enhancement similar to that of vessels). Enhancement scores for the endolymphatic sac, subarcuate artery, and geniculate ganglion were higher in 3D rIR than in 3D SPGR. Washout of enhancement in the endolymphatic sac appeared to be delayed compared with that in the subarcuate artery, suggesting that the enhancement in the endolymphatic sac may have been due in part to non-vascular tissue enhancement. Enhancement of the cochlear lymph space was not observed in any of the subjects in 3D rIR and 3D SPGR. The 3D rIR sequence may be more sensitive than the 3D SPGR sequence in visualizing the enhancement of small structures in the temporal bone; however, enhancement of the cochlear fluid space could not be visualized even with 3D rIR, triple-dose contrast, and dedicated coils at 1.5 T.

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“…6,[11][12][13][14] Of the 5, 2 had 100% sensitivity using axial 2D fast spin-echo T2WI alone and axial 3D fast asymmetric spin-echo T2WI alone and included 10 and 11 patients, respectively. 12,14 Of the remaining 3 studies, Allen et al 6 included 12 small lesions, in which 2 lesions (measuring less than 4 mm) were missed by 2 of 4 observers in small internal auditory canals using axial and coronal T2 fast spin-echo with voxel size of approximately 0. lesion was undetected by 1 of 2 observers on axial 3D CISS with voxel size of approximately 0.7 mm isotropic. Hermans et al 13 imaged 9 small lesions in which a 3-mm IAC lesion was missed by both observers, and a 6-mm intralabyrinthine lesion was missed by 1 observer using a 0.7 ϫ 0.7 ϫ 3.0 mm axial 3D CISS sequence.…”

Section: Discussionmentioning

confidence: 99%

Diagnostic Accuracy of Screening MR Imaging Using Unenhanced Axial CISS and Coronal T2WI for Detection of Small Internal Auditory Canal Lesions

Abele¹,

Besachio

Quigley³

et al. 2014

AJNR Am J Neuroradiol

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BACKGROUND AND PURPOSE:While enhanced T1WI is considered the "gold standard" for detection of internal auditory canal pathology, unenhanced fluid-sensitive sequences have shown high sensitivity for lesion identification. Our purpose was to evaluate the diagnostic accuracy of an unenhanced MR imaging protocol using axial CISS and coronal T2WI for detection of small (10 mm or less) internal auditory canal lesions.

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MR imaging of the inner ear: comparison of a three-dimensional fast spin-echo sequence with use of a dedicated quadrature-surface coil with a gadolinium-enhanced spoiled gradient-recalled sequence.

Abstract: The unenhanced 3D asymmetric fast SE sequence with a quadrature-surface phased-array coli allows the reliable detection of vestibular schwannoma in the cerebellopontine angle and internal auditory canal.

Cited by 37 publications

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Contrast-enhanced MR imaging of the endolymphatic sac in patients with sudden hearing loss

Contrast-enhanced MR imaging of the endolymphatic sac in patients with sudden hearing loss

High-resolution T1-weighted 3D real IR imaging of the temporal bone using triple-dose contrast material

Diagnostic Accuracy of Screening MR Imaging Using Unenhanced Axial CISS and Coronal T2WI for Detection of Small Internal Auditory Canal Lesions

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