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首页> 外文期刊>Ultrasound in Medicine and Biology >Non-invasive Vascular Radial/Circumferential Strain Imaging and Wall Shear Rate Estimation Using Video Images of Diagnostic Ultrasound
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Non-invasive Vascular Radial/Circumferential Strain Imaging and Wall Shear Rate Estimation Using Video Images of Diagnostic Ultrasound

机译：使用诊断性超声的视频图像进行非侵入性血管径向/周向应变成像和壁剪切率估计

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摘要

The aim of this work was to develop a convenient method for radial/circumferential strain imaging and shear rate estimation that could be used as a supplement to the current routine screening for carotid atherosclerosis using video images of diagnostic ultrasound. A reflection model-based correction for gray-scale non-uniform distribution was applied to B-mode video images before strain estimation to improve the accuracy of radial/circumferential strain imaging when applied to vessel transverse cross sections. The incremental and cumulative radial/circumferential strain images can then be calculated based on the displacement field between consecutive B-mode images. Finally, the transverse Doppler spectra acquired at different depths along the vessel diameter were used to construct the spatially matched instantaneous wall shear values in a cardiac cycle. Vessel phantom simulation results revealed that the signal-to-noise ratio and contrast-to-noise ratio of the radial and circumferential strain images were increased by 2.8 and 5.9dB and by 2.3 and 4.4dB, respectively, after non-uniform correction. Preliminary results for 17 patients indicated that the accuracy of radial/circumferential strain images was improved in the lateral direction after non-uniform correction. The peak-to-peak value of incremental strain and the maximum cumulative strain for calcified plaques are evidently lower than those for other plaque types, and the echolucent plaques had higher values, on average, than the mixed plaques. Moreover, low oscillating wall shear rate values, found near the plaque and stenosis regions, are closely related to plaque formation. In conclusion, the method described can provide additional valuable results as a supplement to the current routine ultrasound examination for carotid atherosclerosis and, therefore, has significant potential as a feasible screening method for atherosclerosis diagnosis in the future.
机译：这项工作的目的是开发一种方便的径向/周向应变成像和剪切速率估算方法，该方法可作为当前使用诊断超声视频图像常规检查颈动脉粥样硬化的补充。在应变估计之前，将基于反射模型的灰度不均匀分布校正应用于B模式视频图像，以提高应用于血管横截面时径向/周向应变成像的准确性。然后，可以基于连续B模式图像之间的位移场来计算增量和累积径向/周向应变图像。最后，沿血管直径在不同深度处获得的横向多普勒频谱用于构建心动周期中空间匹配的瞬时壁切变值。血管模型仿真结果表明，在进行非均匀校正后，径向和周向应变图像的信噪比和对比度噪声比分别提高了2.8dB和5.9dB，以及2.3和4.4dB。 17例患者的初步结果表明，经过非均匀校正后，径向/周向应变图像的准确性在横向上得到了改善。钙化斑块的增量应变和最大累积应变的峰峰值明显低于其他斑块，并且回声斑块的平均值平均高于混合斑块。此外，在斑块和狭窄区域附近发现的低振荡壁剪切速率值与斑块形成密切相关。总之，所描述的方法可以提供额外有价值的结果，作为对颈动脉粥样硬化的当前常规超声检查的补充，因此，作为将来用于诊断动脉粥样硬化的可行筛查方法，其潜力巨大。

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