Assessing Inner Ear Volumetric Measurements by Using Three-Dimensional Reconstruction Imaging of High-Resolution Cone-Be
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Assessing Inner Ear Volumetric Measurements by Using Three-Dimensional Reconstruction Imaging of High-Resolution Cone-Beam Computed Tomography Jan Hiller 1 & Nour-Eldin Abdelrehim Nour-Eldin 1,2 & Tatjana Gruber-Rouh 1 & Iris Burck 1 & Marc Harth 1 & Timo Stöver 3 & Thomas Vogl 1 & Nagy Naguib Naeem Naguib 4,5 Accepted: 9 September 2020 # The Author(s) 2020
Abstract The aim of the study was to obtain volumetric data of the components of the inner ear using three-dimensional reconstruction of high-resolution cone-beam computed tomography (CBCT) images. Two hundred three CBCT image series of the temporal bone from 118 anatomically normal patients (55 women and 63 men; mean age: 49.4 ± 20.4 years) with different suspected disorders were included in this study. Normative volumetric measurements of the inner ear, the cochlea, the semicircular canals (SSC), and the vestibule were determined using a semi-automated reconstruction method of the Workstation. Volumetric measurements were successfully completed in all 118 patients. Mean inner ear, cochlear, and vestibule volumes were statistically significantly larger in males than in females on both sides (p < 0.001). Regarding the semicircular canals, no statistically significant (p = 0.053) volume difference was found. The difference between the volumes on both sides was not significant. No correlation between the patient’s age and the volume of the compartments was seen (p > 0.05). There was no significant difference between mean bony inner ear volumes when the clinical diagnoses were compared (p > 0.05 for all clinical diagnoses and volumes). Our study concluded that three-dimensional reconstruction and assessment of the volumetric measurements of the inner ear can be obtained using highresolution CBCT imaging. Keywords Inner ear . Cone-beam computed tomography . Imaging . Three-dimensional . Organ volume . Semi-automated segmentation . Drug concentration
Introduction Various pathological disorders of the inner ear are associated with increased or decreased organ volume, for which exact * Jan Hiller [email protected] 1
Department of Diagnostic and Interventional Radiology, University-Hospital Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt, Germany
2
Department of Diagnostic and Interventional Radiology, Faculty of Medicine, Cairo University, Cairo, Egypt
3
Department of Otolaryngology, University Hospital Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt, Germany
4
AMEOS Hospital in Halberstadt, Radiology Department, Halberstadt, Germany
5
Department of Diagnostic and Interventional Radiology, Faculty of Medicine, Alexandria University, Alexandria, Egypt
measurements of this compartment can be of diagnostic and clinical relevance [1, 2]. Volumetric measurements are challenging due to the extremely small size, and visual inspection of two-dimensional images is not accurate enough to identify all pathologic disorders [3]. In 2014, Teixido et al. stated that volumetric measurements of the inner ear might be much more accurate when using high-resolutio
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