جهت دسترسی به کاربرگه ی زیر، از این لینک استفاده کنید. http://dl.kums.ac.ir/handle/Hannan/132319
Title: A new computed tomography method to identify meningitis-related cochlear ossification and fibrosis before cochlear implantation
Authors: Ichikawa, K;Kashio, A;Mori, H;Ochi, A;Karino, S;Sakamoto, T;Kakigi, A;Yamasoba, T
Keywords: Adult;Child;Child, Preschool;Cochlear Diseases;Cochlear Implantation;Cochlear Implants;Cohort Studies;Deafness;Female;Fibrosis;Follow-Up Studies;Hospitals, University;Human;Image Processing, Computer-Assisted;Male;Meningitis;Ossification, Heterotopic;Preoperative Care;Retrospective Studies;Risk Assessment;Tomography, X-Ray Computed;Treatment Outcome
Year: 2014
Abstract: To develop a new method to determine the presence of intracochlear ossification and/or fibrosis in cochlear implantation candidates with bilateral profound deafness following meningitis.|Diagnostic test assessment.|A university hospital.|This study involved 15 ears from 13 patients with profound deafness following meningitis who underwent cochlear implantation. These ears showed normal structures, soft tissue, partial bony occlusion, and complete bony occlusion in 4, 3, 2, and 6 ears, respectively. We measured radiodensity in Hounsfield units (HU) using 0.5-mm-thick axial high-resolution computed tomography image slices at 3 different levels in the basal turn, the fenestration, and inferior and ascending segment sites, located along the electrode-insertion path. Pixel-level analysis on the DICOM viewer yielded actual computed tomography values of intracochlear soft tissues by eliminating the partial volume effect. The values were compared with the intraoperative findings.|Values for ossification (n = 12) ranged from +547 HU to +1137 HU; for fibrosis (n = 11), from +154 HU to +574 HU; and for fluid (n = 22), from -49 HU to +255 HU. From these values, we developed 2 presets of window width (WW) and window level (WL): (1) WW: 1800, WL: 1100 (200 HU to 2000 HU) and (2) WW: 1500, WL: 1250 (500 HU to 2000 HU). The results using these 2 presets corresponded well to the intraoperative findings.|Our new method is easy and feasible for preoperative determination of the presence of cochlear ossification and/or fibrosis that develops following meningitis.
URI: http://www.ncbi.nlm.nih.gov/pubmed/24415493\nhttp://oto.sagepub.com/content/150/4/646.full.pdf
http://dl.kums.ac.ir/handle/Hannan/132319
ISSN: 1097-6817
volume: Volume 150
Issue: Issue 4
month: April
More Information: Volume : 150Issue : 4Start page : 646
END PAGES : 653
Appears in Collections:Otolaryngology - Head and Neck Surgery

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