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Parallel-transmit-accelerated 2D Selective RF Excitation MR of the Temporal Bone

Enhanced Resolution of Labyrinthine and IAC Structures

Schulze, Maximilian; Seeger, Achim; Reimann, Katrin; Klose, Uwe; Ernemann, Ulrike; Hauser, Till-Karsten

doi: 10.1097/MAO.0000000000000986
BASIC SCIENCE
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Rationale and Objectives: The purpose of this study was to compare a standard T2 SPACE sequence (standard-SPACE) used in temporal bone imaging at 3 T with a new parallel-transmit-accelerated 2D-selective radio frequency excitation technique for SPACE which was either time-improved or resolution-improved.

Materials and Methods: Thirty-two consecutive patients were examined in this IRB-approved study using a standard T2 SPACE sequence, and then a time-improved zoomed SPACE sequence (short z-SPACE) with identical resolution but accelerated image acquisition and a resolution-improved zoomed SPACE sequence (high-resolution z-SPACE) with identical acquisition time but higher resolution at a 3-T magnetic resonance imaging system. Signal-to-noise ratio (SNR) was measured within selected regions of interest. Image quality of anatomic temporal bone structures was determined by two independent readers using a four-point visual scale.

Results: Significant image quality improvement (p < 0.05) was observed in short z-SPACE and high-resolution z-SPACE, especially in structures of the cochlea and also regarding the delineation of the cranial nerves within the internal auditory canal. SNR measurements showed a lower SNR in the short z-SPACE and high-resolution z-SPACE sequences compared with standard-SPACE.

Conclusion: At 3 T parallel transmission using the zoomed SPACE sequences improves the delineation of small anatomical structures within the temporal bone significantly. It is especially helpful in depicting cochlear and internal auditory canal anatomy and can therefore improve imaging in patients with temporal bone pathologies.

*Department of Diagnostic and Interventional Neuroradiology

University Department of Otolaryngology, Head and Neck Surgery

Department of Diagnostic and Interventional Neuroradiology, Magnetic Resonance Research Group, Eberhard-Karls-University Tübingen, Tübingen, Germany

Address correspondence and reprint requests to Katrin Reimann, M.D., University Department of Otolaryngology, Head and Neck Surgery, Eberhard-Karls-University Tübingen, Elfriede Aulhorn Strasse 5, 72076 Tübingen, Germany; E-mail: katrin.reimann@med.uni-tuebingen.de

The authors disclose no conflicts of interest.

Copyright © 2016 by Otology & Neurotology, Inc. Image copyright © 2010 Wolters Kluwer Health/Anatomical Chart Company