Li X K, Irvine T, Wanitkun S, Mori Y, Detmer P R, Li X N, Wu Y, Martin R W, Sahn D J
The Clinical Care Center for Congenital Heart Disease, Oregon Health Sciences University, Portland, OR 97201, USA.
Eur J Echocardiogr. 2000 Dec;1(4):244-51. doi: 10.1053/euje.2000.0040.
Evaluation of the accuracy of direct computation of multiple three-dimensional (3D) flow convergence (FC) isovelocities by using digital reconstruction of colour Doppler data of the flow convergence region.
We used a conventional ultrasound system (ATL HDI 3000) connected to a computer workstation via Ethernet link. The digital 3D datasets were directly transferred to a Silicon Graphic Imaging Octane workstation for later measurement. We generated nine pulsatile flows (20-60 ml/beat), with peak flow rates (67-180 ml/s), through three orifices (circular, rectangular and triangular, S=0.24 cm(2)). The 3D reconstructions of FC surface areas from multi-threshold velocities, including aliasing velocities were analysed to quantify the peak flow rate. For all orifices, linear regression demonstrated excellent correlation between the 3D calculated and electromagnetic flow meter recorded data. While there was a high correlation for 3D computation of flow rate from the single best Nyquist of 24 cm/s (r=0.97-0.98, SEE=7 .75-12.58 ml/s), the ability to average three threshold velocities (15, 18 and 24 cm/s) yielded an improved correlation (r=0.98-0.99, SEE=5.70-7.73 ml/s).
Direct computation of multiple 3D FC isovelocities from digital reconstruction of colour Doppler data of the FC region provides the potential to accurately quantify the complex asymmetric spatial flow events at any selected velocity.
通过对血流会聚区彩色多普勒数据进行数字重建，评估直接计算多个三维（3D）血流会聚（FC）等速线的准确性。
我们使用一台通过以太网链路连接到计算机工作站的传统超声系统（ATL HDI 3000）。数字3D数据集被直接传输到Silicon Graphic Imaging Octane工作站以便后续测量。我们通过三个孔口（圆形、矩形和三角形，S = 0.24 cm²）生成了九种搏动血流（20 - 60 ml/搏），峰值流速为（67 - 180 ml/s）。对包括混叠速度在内的多阈值速度下的FC表面积进行3D重建分析，以量化峰值流速。对于所有孔口，线性回归显示三维计算数据与电磁流量计记录数据之间具有良好的相关性。虽然从24 cm/s的单个最佳奈奎斯特速度进行3D流速计算具有高度相关性（r = 0.97 - 0.98，SEE = 7.75 - 12.58 ml/s），但平均三个阈值速度（15、18和24 cm/s）的能力产生了更好的相关性（r = 0.98 - 0.99，SEE = 5.70 - 7.73 ml/s）。
从FC区域彩色多普勒数据的数字重建直接计算多个3D FC等速线，为在任何选定速度下准确量化复杂的不对称空间血流事件提供了可能。
