title: Imaging measurement and analysis of normal tilt angle of atrium septum.
abstract: OBJECTIVE
  The atrium septum is tilted in heart. There is an angle between atrium septum and the cross section of body, which is called tilt angles of atrium septum (TAAS) in this study, however this angle has not been specifically mentioned in literatures. In this article TAAS was measured and analysed on axial images of contrast enhanced magnetic resonance (CEMR) of normal heart in order to understand quantitatively and accurately the anatomical structure of heart and to supply anatomical basic for some relevant operation.
  
  
  METHODS
  In this article 180 cases of axial images of CEMR of healthy hearts without any organic or functional heart disease were adopted, TAAS were measured and analysed statistically.
  
  
  RESULTS
  On axial images of CEMR of healthy hearts the normal range of TAAS is from 12.43° to 55.60°, the average ± SD is 34.36 ± 6.92°, they are independent of sex and age as well as the position of heart, the distribution is relatively concentrated, the individual difference is rather small.
authors.affiliation: Department of Radiology, Beijing Anzhen Hospital Affiliated to Capital Medical University, Beijing 100029, China.
authors.forename: Jue
authors.initials: J
authors.lastname: Wang
authors.forename: Zhaoqi
authors.initials: Z
authors.lastname: Zhang
authors.forename: Wei
authors.initials: W
authors.lastname: Yu
authors.forename: Cuilian
authors.initials: C
authors.lastname: Miao
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D054087:Atrial Septum / Q000033:anatomy & histology*; D005260:Female; D006801:Humans; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D008953:Models, Anatomic; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D055815:Young Adult