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Acoustic radiation force beam sequence performance for detection and material characterization of atherosclerotic plaques: preclinical, ex vivo results

机译:用于检测和表征动脉粥样硬化斑块的声辐射力束序列性能:临床前,离体结果

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摘要

This work presents preclinical data demonstrating performance of acoustic radiation force (ARF)-based elasticity imaging with five different beam sequences for atherosclerotic plaque detection and material characterization. Twelve trained, blinded readers evaluated parametric images taken ex vivo under simulated in vivo conditions of 22 porcine femoral arterial segments. Receiver operating characteristic (ROC) curve analysis was carried out to quantify reader performance using spatially-matched immunohistochemistry for validation. The beam sequences employed had high sensitivity (sens) and specificity (spec) for detecting Type III+ plaques (sens: 85%, spec: 79%), lipid pools (sens: 80%, spec: 86%), fibrous caps (sens: 86%, spec: 82%), calcium (sens: 96%, spec: 85%), collagen (sens: 78%, spec: 77%), and disrupted internal elastic lamina (sens: 92%, spec: 75%). 1:1 single-receive tracking yielded the highest median areas under the ROC curve (AUC), but was not statistically significantly higher than 4:1 parallel-receive tracking. Excitation focal configuration did not result in statistically different AUCs. Overall, these results suggest ARF-based imaging is relevant to detecting and characterizing plaques and support its use for diagnosing and monitoring atherosclerosis.
机译:这项工作提供了临床前数据,该数据证明了基于声辐射力(ARF)的弹性成像的性能,具有五个不同的射束序列,用于动脉粥样硬化斑块的检测和材料表征。十二名受过训练的盲人读者评估了在22个猪股动脉节段的体内模拟条件下离体拍摄的参数图像。使用空间匹配的免疫组织化学进行验证,进行接收者操作特征(ROC)曲线分析以量化阅读器性能。所使用的光束序列具有高灵敏度(sens)和特异性(spec)用于检测III +型斑块(sens:85%,spec:79%),脂质池(sens:80%,spec:86%),纤维帽(sens) :86%,spec:82%),钙(sens:96%,spec:85%),胶原蛋白(sens:78%,spec:77%),以及内部弹性层破裂(sens:92%,spec:75) %)。 1:1单一接收跟踪在ROC曲线(AUC)下产生了最高的中位数面积,但统计上没有明显高于4:1并行接收跟踪。激发焦点配置没有导致统计上不同的AUC。总体而言,这些结果表明基于ARF的成像与斑块的检测和特征化有关,并支持其用于诊断和监测动脉粥样硬化。

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