MAGNETIC-RESONANCE VELOCITY MAPPING OF NORMAL HUMAN TRANSMITRAL VELOCITY PROFILES
MAGNETIC-RESONANCE VELOCITY MAPPING OF NORMAL HUMAN TRANSMITRAL VELOCITY PROFILES
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DOI：
10.1007/bf01744902
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发表时间：
1995-01-01
影响因子：
1.5
通讯作者：
GIBSON, DG
中科院分区：
文献类型：
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作者：
FUJIMOTO, S;MOHIADDIN, RH;GIBSON, DG
应用磁共振成像（MRI）速度图技术，对11例正常人舒张早期二尖瓣血流速度分布进行了研究。从二尖瓣环到腔内4 cm，以1 cm的间隔获得二尖瓣流入道的速度曲线。二尖瓣环水平的射流宽度为3.06 +/- 0.64 cm，在4 cm处增加至3.6 +/- 0.61 cm。二尖瓣环处的峰值/平均流速为1.2 +/- 0.07，在距二尖瓣环3-4 cm处增加至约1.4。在每个水平记录峰值速度的点从二尖瓣环中心向间隔侧偏斜射流宽度的10%-13%，距离环2-4 cm。然而，在相当于二尖瓣尖水平的1 cm深度处，峰值速度位于射流中心。射流横截面的垂直尺寸和水平尺寸之比为1.11 +/- 0.05。因此，二尖瓣流入流速曲线在二尖瓣环和头端水平相对平坦;流入射流横截面实际上是圆形的。
We used magnetic resonance imaging (MRI) velocity mapping to assess the velocity profile of early diastolic mitral inflow in 11 normal subjects, Velocity maps of left ventricular inflow were obtained in the horizontal long axis of the left ventricle at the time of peak early diastolic filling. Velocity profile curves across the mitral inflow were obtained at 1-cm intervals from the mitral ring to 4 cm into the cavity. The jet width was 3.06 +/- 0.64 cm at the mitral ring level, increasing to 3.6 +/- 0.61 cm at 4 cm. The peak/mean velocity was 1.2 +/- 0.07 at the mitral ring and increased to around 1.4 at 3-4 cm from the mitral ring. The point at which the peak velocity was recorded at each level was skewed towards the septal side by 10%-13% of jet width from the center at the mitral ring and 2-4 cm from the ring. However, at a depth of 1 cm, corresponding to the mitral tip level, the peak velocity was at the center of the jet. The ratio of vertical and horizontal dimensions of the jet cross section was 1.11 +/- 0.05. Thus, the mitral inflow velocity profile is relatively flat at the mitral ring and tip level; the inflow jet cross section is effectively circular.