Adaptive imaging on a diagnostic ultrasound scanner at quasi real-time rates
Adaptive imaging on a diagnostic ultrasound scanner at quasi real-time rates
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DOI：
10.1109/tuffc.2006.115
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发表时间：
2006-10-01
影响因子：
3.6
通讯作者：
Trahey, Gregg E.
中科院分区：
文献类型：
--
作者：
Dahl, Jeremy J.;McAleavey, Stephen A.;Trahey, Gregg E.
构建能够实时补偿相位误差的超声成像系统是自适应成像中的重大挑战。我们提出了一种多功能自适应成像系统，能够以大约每秒 2 帧 (fps) 的帧速率（对于 1-D 阵列）更新到达时间剖面，对于 1.75-D 阵列高达 0.81 fps（取决于所需的近场相位校正算法）。该系统的一项新颖功能是能够更新 I-D 阵列的多个光束位置处的像差分布。这种实时自适应成像系统的特征在具有物理近场相位屏幕的模拟组织模型中得到说明，并通过 1.75 维阵列在临床乳腺组织中进行评估。在模拟组织模型中，无回声囊肿的对比度与噪声比（CNR）显着提高。在乳腺组织中，点状目标的宽度显示出显着改善：平均减少 26.2%。然而，这些目标的亮度略有下降 3.9%。对于囊肿等较大结构，观察到特征和 CNR 几乎没有改善，这可能是系统假设 1.75 维阵列具有无限等晕面片大小的结果。还讨论了构建实时自适应成像系统的必要要求。
Constructing an ultrasonic imaging system capable of compensating for phase errors in real-time is a significant challenge in adaptive imaging. We present a versatile adaptive imaging system capable of updating arrival time profiles at frame rates of approximately 2 frames per second (fps) with 1-D arrays and up to 0.81 fps for 1.75-D arrays, depending on the desired near-field phase correction algorithm. A novel feature included in this system is the ability to update the aberration profile at multiple beam locations for I-D arrays. The features of this real-time adaptive imaging system are illustrated in tissue-mimicking phantoms with physical near-field phase screens and evaluated in clinical breast tissue with a 1.75-D array. The contrast-to-noise ratio (CNR) of anechoic cysts was shown to improve dramatically in the tissue-mimicking phantoms. In breast tissue, the width of point-like targets showed significant improvement: a reduction of 26.2% on average. Brightness of these targets, however, marginally decreased by 3.9%. For larger structures such as cysts, little improvement in features and CNR were observed, which is likely a result of the system-assuming an infinite isoplanatic patch size for the 1.75-D arrays. The necessary requirements for constructing a real-time adaptive imaging system are also discussed.