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DOI: 10.1055/s-0033-1346275
Adding the Third Dimension to High Resolution MR-Imaging of the Inner Ear: An Answer waiting for a question
Ziele: To test the feasibility of three-dimensional (3D) reconstruction of the inner ear structures using high resolution MRI in patients referred for different abnormalities of the inner ear. Methode: The study was retrospectively performed on 87 patients with a mean age of 51.6 year. High resolution MR-Imaging was performed using an ISO-Space sequence with 0.6 mm slice thickness. Three dimensional reconstructions were performed using the InSpace Application. Both sides were reconstructed separately. All reconstructions were performed by a single radiologist with more than 12 years experience in MR-Imaging. The 3D reconstruction was considered successful when all structures of the inner ear were clearly demonstrated and identified regardless of the pathology. Ergebnis: The indication for MRI was hearing loss (n = 54), suspected acoustic Neuroma (n = 13), vertigo (n = 8), tinnitus (n = 7), facial palsy (n = 3) and Otalgia (n = 2). Three dimensional reconstruction was successfully performed on both ears in 73 patients (83.9%). In 3 patients (3.5%) the reconstruction was only unilaterally successful. In 11 patients (12.6%) the reconstruction was not possible. Cases of failed bilateral reconstruction were due to motion artifacts (n = 7, 8.0%) or due to very high level of noise in the obtained images (n = 4, 4,6%). The three cases of failed bilateral reconstruction were due to incorrect positioning of the patient. Schlussfolgerung: Three dimensional reconstruction of the inner ear structures can be successfully and bilaterally performed in 83.9% of patients using high resolution MR-Imaging. Correct positioning of the patient and reduction of motion artifacts can add to the feasibility of the reconstruction.
Korrespondierender Autor: Naguib NN
Johann Wolfgang Goethe Universitätsklinikum, Institut für diagnostische und interventionelle Radiologie, Theodor-Stern-Kai 7, 60596 Frankfurt am Main
E-Mail: nagynnn@yahoo.com
3D - Inner Ear - MRI