title: [Morphological and function of normal mitral valve: correlation of CT features and cardiac cycle phase].
abstract: OBJECTIVE
  To observe the changes of morphology and functions of the mitral valve during the cardiac cycle with a 64-detector row CT.
  
  
  METHODS
  The hearts of 40 normal adults were scanned with a 64-detector row CT. Ten time phases in the cardiac cycle were reconstructed. The morphologic features of the mitral valve in different phases were analyzed using the volume rendering technique (VRT). The diameter and area of the mitral annular and the mitral valve, and the open angle of the mitral valve were measured at the cardiac H-long axis and the short-axis.
  
  
  RESULTS
  The maximal diameter and area of the mitral annular and the mitral valve appeared in late diastole, with a value of (29.3 +/- 3.5) mm and (962.8 +/- 149.3) mm2, and (36.5 +/- 7.3) mm and (647.0 +/- 162.3) mm2, respectively. The maximal open angles also appeared in late diastole, with a value of (68.3 +/- 5.61) degrees and (55.9 +/- 5.4) degrees, for the anterior and posterior valves respectively. The minimal diameter and area of the mitral annular and open angles of the anterior and posterior valves appeared in mid-systole, with a value of (9.8 +/- 1.7) mm and (76.2 +/- 27.3) mm2, and (11.5 +/- 2.8) degrees and (9.6 +/- 2.8) degrees, respectively.
  
  
  CONCLUSIONS
  The morphologic and functional changes of mitral valve during the cardiac cycle can be detected by the 64-detector row CT.
authors.affiliation: Department of Radiology, West China Hospital, Sichuan University, Chengdu, China.
authors.forename: Xiao-chun
authors.initials: XC
authors.lastname: Zhang
authors.forename: Zhi-gang
authors.initials: ZG
authors.lastname: Yang
authors.forename: Yuan
authors.initials: Y
authors.lastname: Li
authors.forename: Ying-kun
authors.initials: YK
authors.lastname: Guo
authors.forename: Zhi-hui
authors.initials: ZH
authors.lastname: Dong
authors.forename: Zhen-lin
authors.initials: ZL
authors.lastname: Li
mesh_terms: D003971:Diastole / Q000502:physiology*; D006801:Humans; D008943:Mitral Valve / Q000033:anatomy & histology / Q000000981:diagnostic imaging* / Q000502:physiology*; D013599:Systole / Q000502:physiology*; D036542:Tomography, Spiral Computed / Q000379:methods