[Morphological and function of normal mitral valve: correlation of CT features and cardiac cycle phase].
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.
Zhang
Xiao-chun
XC
Department of Radiology, West China Hospital, Sichuan University, Chengdu, China.
Yang
Zhi-gang
ZG
Li
Yuan
Y
Guo
Ying-kun
YK
Dong
Zhi-hui
ZH
Li
Zhen-lin
ZL
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