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Patterns of Signal Intensity in CISS MRI of the Inner Ear and Eye
Antonia Mair1, Christopher I Song1, Bela Büki2
1Department of Otolaryngology-Head and Neck Surgery, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
Tomography (Ann Arbor, Mich.)
|February 23, 2024
Summary
Constructive interference in steady state (CISS) magnetic resonance imaging (MRI) reveals common anatomical patterns in the inner ear, often blurred by partial volume averaging. Eye banding artifacts in CISS MRI are more variable.
Area of Science:
- Radiology
- Neuroimaging
- Anatomy
Background:
- Constructive interference in steady state (CISS) is an MRI sequence offering high contrast for cerebrospinal fluid.
- CISS sequences are susceptible to banding artifacts caused by magnetic field inhomogeneities.
- Characterizing these artifacts in the inner ear and eye is crucial for accurate interpretation.
Purpose of the Study:
- To characterize low-signal intensity regions and banding artifacts in the inner ear and eye using CISS MRI.
- To correlate CISS findings in the inner ear with temporal bone histopathology.
Main Methods:
- Thirty patients underwent CISS sequence MRI (60 ears/eyes).
- Low-signal regions in the inner ear were identified and compared to anatomy.
- The number and angle of banding artifacts in the eyes were quantified.
Main Results:
- Consistent low-signal anatomical regions were observed in the cochlea (modiolus, spiral lamina, interscalar septa) and labyrinth (crista, utricular macula).
- Low-signal areas in the vestibule likely represent the membranous utricle walls.
- Banding artifacts were present in most eyes, with variability in number and angle.
Conclusions:
- Low-signal regions in the inner ear on CISS MRI are common, anatomically consistent, and often represent normal structures affected by partial volume averaging.
- Banding artifacts in the eye on CISS MRI are more variable and less predictable.
