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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Ultrafast compound imaging for 2-D motion vector estimation: application to transient elastography
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Ultrafast compound imaging for 2-D motion vector estimation: application to transient elastography

机译：用于二维运动矢量估计的超快速复合成像：在瞬时弹性成像中的应用

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摘要

This paper describes a new technique for two-dimensional (2-D) imaging of the motion vector at a very high frame rate with ultrasound. Its potential is experimentally demonstrated for transient elastography. But, beyond this application, it also could be promising for color flow and reflectivity imaging. To date, only axial displacements induced in human tissues by low-frequency vibrators were measured during transient elastography. The proposed technique allows us to follow both axial and lateral displacements during the shear wave propagation and thus should improve Young's modulus image reconstruction. The process is a combination of several ideas well-known in ultrasonic imaging: ultra-fast imaging, multisynthetic aperture beamforming, 1-D speckle tracking, and compound imaging. Classical beamforming in the transmit mode is replaced here by a single plane wave insonification increasing the frame rate by at least a factor of 128. The beamforming is achieved only in the receive mode on two independent subapertures. Comparison of successive frames by a classical 1-D speckle tracking algorithm allows estimation of displacements along two different directions linked to the subapertures beams. The variance of the estimates is finally improved by tilting the emitting plane wave at each insonification, thus allowing reception of successive decorrelated speckle patterns.
机译：本文介绍了一种新技术，用于以超高帧频对运动矢量进行二维（2-D）成像。其潜力已通过实验证明可用于瞬时弹性成像。但是，除此应用之外，它对于色流和反射率成像也很有希望。迄今为止，在瞬时弹性成像期间仅测量了由低频振动器在人体组织中引起的轴向位移。所提出的技术允许我们在剪切波传播期间跟随轴向位移和横向位移，因此应改善杨氏模量图像重建。该过程结合了超声成像中众所周知的几种想法：超快速成像，多合成孔径波束形成，一维散斑跟踪和复合成像。发射模式下的经典波束成形在这里被单个平面波声化所代替，帧频至少提高了128倍。波束成形仅在接收模式下在两个独立的子孔径上实现。通过经典的一维散斑跟踪算法对连续帧进行比较，可以估算沿链接到子孔径光束的两个不同方向的位移。最终，通过在每次声化时倾斜发射平面波来改善估计的方差，从而允许接收连续的去相关散斑图案。

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