title: [Technique of radiologic measurements for the inner ear structures using computed tomography].
abstract: OBJECTIVE
  The aim of this study was to find an accurate and feasible measurement technique for the inner ear structures using computed tomography and to check the inter-observer agreement
  
  
  METHODS
  Sixty patients without abnormal structure of temporal bones confirmed by means of high-resolution computed tomography were included in this study. The multi-planar reformations (MPR) were performed to show the maximum profile of cochlear, and to measure the height and width of cochlear. Areas of bony island encircled by three semicircular canals were measured on the MPR images that could show the whole canal. The data measured by two readers independently was compared to check the inter-observer agreement.
  
  
  RESULTS
  The application of MPR yielded satisfactory anatomic presentation of inner ear for radiologic measurements. There was good inter-observer agreement revealed by the paired t-test and correlation analysis (P>0.05, r>0.9). The height of cochlear (x+/-s) was (4.26+/-0.28) mm while the width of cochlear was (7.03+/-0.39) mm. The areas of bony islands encircled by the anterior, posterior and lateral semicircular canals were (25.49+/-3.84) mm2, (20.07+/-2.93) mm2 and (11.50+/-1.94) mm2, respectively.
  
  
  CONCLUSIONS
  MPR can display structures of cochlear and semicircular canals on planes along their central axis. Normative measurements on these MPR images derive excellent repeatability and provide reliable morphologic parameters of inner ear structures.
authors: Department of Radiology, Affiliated First People's Hospital, Shanghai Jiaotong University, Shanghai 200080, China. ctzgm@yahoo.com.cn
authors: Guang-Ming
authors: GM
authors: Zhao
authors: Jun-Hua
authors: JH
authors: Liu
authors: Gui-Xiang
authors: GX
authors: Zhang
authors: Yue-Ping
authors: YP
authors: Zhang
authors: Xiao-Chun
authors: XC
authors: Yuan
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D003051:Cochlea / Q000000981:diagnostic imaging; D007758:Ear, Inner / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012665:Semicircular Canals / Q000000981:diagnostic imaging; D014057:Tomography, X-Ray Computed / Q000379:methods*; D055815:Young Adult