Villagomez Hoyos Carlos Armando, Stuart Matthias Bo, Hansen Kristoffer Lindskov, Nielsen Michael Bachmann, Jensen Jorgen Arendt
IEEE Trans Ultrason Ferroelectr Freq Control. 2016 Jun;63(6):842-53. doi: 10.1109/TUFFC.2016.2551689. Epub 2016 Apr 11.
This paper presents a novel approach for estimating 2-D flow angles using a high-frame-rate ultrasound method. The angle estimator features high accuracy and low standard deviation (SD) over the full 360° range. The method is validated on Field II simulations and phantom measurements using the experimental ultrasound scanner SARUS and a flow rig before being tested in vivo. An 8-MHz linear array transducer is used with defocused beam emissions. In the simulations of a spinning disk phantom, a 360° uniform behavior on the angle estimation is observed with a median angle bias of 1.01° and a median angle SD of 1.8°. Similar results are obtained on a straight vessel for both simulations and measurements, where the obtained angle biases are below 1.5° with SDs around 1°. Estimated velocity magnitudes are also kept under 10% bias and 5% relative SD in both simulations and measurements. An in vivo measurement is performed on a carotid bifurcation of a healthy individual. A 3-s acquisition during three heart cycles is captured. A consistent and repetitive vortex is observed in the carotid bulb during systoles.
本文提出了一种使用高帧率超声方法估计二维流动角度的新方法。该角度估计器在整个360°范围内具有高精度和低标准差（SD）。在使用实验性超声扫描仪SARUS和流动试验台进行体内测试之前，该方法在Field II模拟和体模测量中得到了验证。使用8 MHz线性阵列换能器进行散焦波束发射。在旋转盘体模的模拟中，观察到角度估计的360°均匀行为，中值角度偏差为1.01°，中值角度标准差为1.8°。在直线血管的模拟和测量中也获得了类似的结果，其中获得的角度偏差低于1.5°，标准差约为1°。在模拟和测量中，估计的速度大小偏差也保持在10%以下，相对标准差在5%以下。对一名健康个体的颈动脉分叉处进行了体内测量。在三个心动周期内进行了3秒的采集。在收缩期，在颈动脉窦中观察到一致且重复的涡流。
