Abstract
Objectives: To develop and evaluate a new coordinate system for MRI of the vestibular system.Methods: In this study, 53 internal auditory canal MRI and 78 temporal bone CT datasets were analyzed. Mimics Medical software version 21.0 was used to visualize and three-dimensionally reconstruct the image data. We established a new coordinate system, named W–X, based on the center of the bilateral eyeballs and vertex of the bilateral superior semicircular canals. Using the W–X coordinate system and Reid's coordinate system, we measured the orientations of the planes of the anterior semicircular canal (ASCC), the lateral semicircular canal (LSCC), and the posterior semicircular canal (PSCC).Results: No significant differences between the angles measured using CT and MRI were found for any of the semicircular canal planes (p > 0.05). No statistical differences were found between the angles measured using Reid's coordinate system (CT) and the W–X coordinate system (MRI). The mean values of ∠ASCC & LSCC, ∠ASCC & PSCC, and ∠LSCC & PSCC were 84.67 ± 5.76, 94.21 ± 3.81, and 91.79 ± 5.22 degrees, respectively. The angle between the LSCC plane and the horizontal imaging plane was 15.64 ± 3.92 degrees, and the angle between the PSCC plane and the sagittal imaging plane was 48.79 ± 4.46 degrees.Conclusion: A new W–X coordinate system was developed for MRI studies of the vestibular system and can be used to measure the orientations of the semicircular canals.
Highlights
The annual prevalence of dizziness is approximately 11% in the United States [1, 2] and dysfunction of the vestibular system is one of the most common causes
We measured the relative orientations of the semicircular canal planes (Table 1)
We found that the average angle between the plane of the posterior semicircular canal (PSCC) and the sagittal plane (SP) was 48.79 degrees, and the average angle between the lateral semicircular canal (LSCC) and the horizontal plane (HP) was 15.64 degrees
Summary
The annual prevalence of dizziness is approximately 11% in the United States [1, 2] and dysfunction of the vestibular system is one of the most common causes. Two specific structures of the vestibular system, the otolith organs and semicircular canals, enable humans to perceive head rotation, angular acceleration, and spatial orientation [4]. 10– 20% of patients with suspected benign paroxysmal positional vertigo (BPPV) cannot be accurately diagnosed or effectively treated using routine procedures [9, 10], which involve a series of head rotations at specific angles. For these subjects, the relative orientations of the semicircular canals may play a critical role in diagnostic complications and the effectiveness of treatment maneuvers [11]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
