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Abstract #1900

Clinical Temporal Bone Imaging at 0.55T: Comparison of Anatomic Evaluation to 1.5/3T MRI and High-Resolution CT

Radhika Rajeev1, Lauren J. Kelsey1, Ashok Srinivasan1, Eric Liao1, Mohannad Ibrahim 1, Nicole Seiberlich1, Vikas Gulani1, Maria Masotti1, Chamila Perera2, J. Rajiv Bapuraj1, and Shruti Mishra1
1Department of Radiology, University of Michigan, Ann Arbor, MI, United States, 2Department of Biostatistics, University of Michigan, Ann Arbor, MI, United States

Synopsis

Keywords: Head & Neck/ENT, Low-Field MRI, Temporal Bone Imaging

Motivation: Identify whether 0.55T MRI may be superior or a clinically acceptable alternative to 1.5T/3T for temporal bone evaluation

Goal(s): To compare image quality, visibility of temporal bone anatomy, and cochlear measurements at 0.55T vs. 1.5T/3T, using high-resolution CT (HRCT) as the gold standard.

Approach: Retrospective assessment of 25 non-pathological ears imaged with temporal bone MRI at 0.55T and 1.5T/3T by 3 blinded radiologists. Available HRCT (n=13) were also reviewed.

Results: For most readers, visibility of normal temporal bone anatomy on 3D T2w SPACE at 0.55T was clinically acceptable. Quantitative evaluation of bony anatomy was similar at 0.55T vs. 1.5/3T compared to HRCT.

Impact: Clinical evaluation of the temporal bone and inner ear structures can be comparably performed on a 3D T2w SPACE sequence at 0.55T when compared to 1.5/3T, which may represent a use-case for the Free.Max 0.55T (Siemens Healthineers) scanner.

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Keywords