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首页> 外文期刊>Ultrasonic Imaging: An International Journal >Influence of bright intramural echoes on estimates of ultrasonic attenuation from backscattered ultrasound in excised myocardium.
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Influence of bright intramural echoes on estimates of ultrasonic attenuation from backscattered ultrasound in excised myocardium.

机译：壁内明亮回声对切除心肌后向散射超声的超声衰减估计值的影响。

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摘要

The purpose of this study was to quantitate the influence of bright intramural echoes on estimates of myocardial attenuation from analyses of backscattered ultrasound. To achieve this, M-mode image-based measurements of the inherent anisotropic properties of myocardial attenuation were performed on rotating myocardial specimens. The approach was to use a commercially-available ultrasonic imaging system to acquire M-mode images of 24 excised cylindrical specimens from six formalin-fixed lamb hearts for data analysis using a video signal analysis technique. As a control, through-transmission rf-based measurements were performed concurrently using a pair of focused, single-element ultrasonic transducers. We devised an objective approach to compensate M-mode results for the presence of bright intramural echoes that makes use of the rotational symmetry of the measurements. A comparison of the uncompensated and compensated estimates of attenuation shows that the effect of bright intramural echoes under the conditions of this study increases the average error in M-mode results by approximately 240% compared with that observed when such effects are minimized by compensation. For both uncompensated and compensated M-mode results, increased temporal averaging shows only a modest reduction in average error. These data suggest that for measurements of attenuation from backscattered ultrasound using M-mode images, the effects of bright intramural echoes can be a significant source of error despite increased temporal averaging and therefore may require compensation.
机译：这项研究的目的是通过反向散射超声分析来量化明亮的壁内回声对心肌衰减估计的影响。为了实现这一点，对旋转的心肌样本进行了基于M模式图像的心肌衰减固有各向异性特性的测量。该方法是使用市售的超声成像系统从六个福尔马林固定的羔羊心脏中采集24个切除的圆柱形标本的M型图像，以使用视频信号分析技术进行数据分析。作为对照，使用一对聚焦的单元素超声换能器同时进行基于透射射频的测量。我们设计了一种客观的方法，可以利用测量的旋转对称性，针对明亮的壁内回声的存在来补偿M模式的结果。对未补偿和补偿后的衰减估计值的比较表明，与通过补偿将这种影响最小化时相比，在本研究条件下，明亮的壁内回声的影响使M模式结果的平均误差增加了约240％。对于未补偿和补偿的M模式结果，增加的时间平均仅显示平均误差的适度降低。这些数据表明，对于使用M模式图像测量背向散射超声的衰减，尽管时间平均增加，明亮的壁内回声的影响仍可能是重要的误差源，因此可能需要进行补偿。

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