Osbakken M, Yuschok T
Cathet Cardiovasc Diagn. 1986;12(3):156-60.
To determine the feasibility of using planar images obtained with gated cardiac magnetic resonance imaging (MRI) techniques to evaluate ventricular contractile function, cardiac chamber volume (V), and ejection fraction (EF) were calculated using MR images obtained in five previously catheterized patients. Patients were imaged with a .15-Tesla 55-cm bore magnet using the ECG to gate the images. Spin echo pulse sequences (30/500, TE/TR) were used to produce images in the transverse (T), coronal (C), and sagittal (S) planes at end diastole (ED) and end systole (ES). Slice thickness was 1.5 cm, with 2-mm resolution. A calibration grid was imaged in each plane to determine correction factors. Cardiac chamber areas were determined via planimetry. An area-length-volume algorithm was used to obtain EDV and ESV. Three combinations of biplane images in ES and ED were used (T/C, T/S, C/S). Volume data were used to calculate EF. Contrast ventriculogram volumes tended to be greater than MRI volumes, but EFs were similar with both techniques. In conclusion, gated cardiac MR images can be used to evaluate the ventricular function parameters of volume and ejection fraction.
为了确定使用门控心脏磁共振成像（MRI）技术获得的平面图像评估心室收缩功能的可行性，利用在5名先前已行心导管检查的患者中获得的磁共振图像计算了心腔容积（V）和射血分数（EF）。使用一台0.15特斯拉、55厘米孔径的磁体对患者进行成像，利用心电图对图像进行门控。采用自旋回波脉冲序列（30/500，TE/TR）在舒张末期（ED）和收缩末期（ES）获取横断（T）、冠状（C）和矢状（S）平面的图像。层厚为1.5厘米，分辨率为2毫米。在每个平面成像一个校准网格以确定校正因子。通过平面测量法确定心腔面积。采用面积-长度-容积算法获取舒张末期容积（EDV）和收缩末期容积（ESV）。使用收缩末期和舒张末期的三种双平面图像组合（T/C、T/S、C/S）。利用容积数据计算射血分数。对比心室造影容积往往大于MRI容积，但两种技术测得的射血分数相似。总之，门控心脏磁共振图像可用于评估心室容积和射血分数等功能参数。
