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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Efficiency of U.S. Tissue Perfusion Estimators
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Efficiency of U.S. Tissue Perfusion Estimators

机译：美国组织灌注估算器的效率

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摘要

We measure the detection and discrimination efficiencies of conventional power-Doppler estimation of perfusion without contrast enhancement. The measurements are made in a phantom with known blood-mimicking fluid flow rates in the presence of clutter and noise. Efficiency is measured by comparing functions of the areas under the receiver operating characteristic curve for Doppler estimators with those of the ideal discriminator, for which we estimate the temporal covariance matrix from echo data. Principal-component analysis is examined as a technique for increasing the accuracy of covariance matrices estimated from echo data. We find that Doppler estimators are <50% efficient at directed perfusion detection between 0.1 and 2.0 mL/min per 2 cm2 flow area. The efficiency was 20%–40% for the task of discriminating between two perfusion rates in the same range. We conclude that there are reasons to search for more efficient perfusion estimators, one that incorporates covariance matrix information that could significantly enhance the utility of Doppler ultrasound without contrast enhancement.
机译：我们在没有对比增强的情况下测量了常规功率多普勒估计灌注的检测和辨别效率。在存在杂波和噪声的情况下，以已知的模仿血液的流速在幻像中进行测量。通过将多普勒估计器的接收器工作特性曲线下的区域函数与理想鉴别器的函数进行比较，可以测量效率，为此，我们根据回波数据估计时间协方差矩阵。主成分分析作为一种提高从回波数据估计的协方差矩阵的准确性的技术，已得到检验。我们发现，多普勒估算器在每2 cm2流量区域0.1至2.0 mL / min之间的定向灌注检测中，效率<50％。区分相同范围内的两种灌注速率的效率为20％–40％。我们得出结论，有理由寻找更有效的灌注估计量，其中包含协方差矩阵信息，可以显着增强多普勒超声的效用而无需增强造影剂。

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