Aberration correction for time-domain ultrasound diffraction tomography.
Aberration correction for time-domain ultrasound diffraction tomography.
复制标题
时域超声衍射断层扫描的像差校正。
DOI：
10.1121/1.1481063
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
T. D. Mast
中科院分区：
文献类型：
--
作者：
T. D. Mast
提出并分析了一种从远场时间域声散射测量数据重建空间相关声速变化的时间域绕射层析成像方法。所得到的重建图像是具有包括超声乳房X光成像在内的应用的定量图像，并且也可以被认为是时间域逆散射问题的候选解决方案。本文证明了线性化的时间域逆散射问题对于有限的信号带宽没有通解。然而，线性化问题的近似解是使用类似于“黄金标准”的超声波束形成的简单延迟和方法来构造的。这种解的形式表明，完全的非线性逆散射问题可以通过对时间域散射数据应用适当的角度和空间相关的时间移位来近似，这种类比导致了象差校正的一般方法。提出了两种相关的像差校正方法：一种是利用有效的直射线近似从介质的估计值计算延迟，另一种是将延迟直接应用于与时间相关的线性化重建。数值结果表明，这些校正方法对大型散射体的成像质量有了很大的改善。通过像差校正，使时间域衍射层析成像方法的参数适用范围提高了约2倍。
Extensions of a time-domain diffraction tomography method, which reconstructs spatially dependent sound speed variations from far-field time-domain acoustic scattering measurements, are presented and analyzed. The resulting reconstructions are quantitative images with applications including ultrasonic mammography, and can also be considered candidate solutions to the time-domain inverse scattering problem. Here, the linearized time-domain inverse scattering problem is shown to have no general solution for finite signal bandwidth. However, an approximate solution to the linearized problem is constructed using a simple delay-and-sum method analogous to "gold standard" ultrasonic beamforming. The form of this solution suggests that the full nonlinear inverse scattering problem can be approximated by applying appropriate angle- and space-dependent time shifts to the time-domain scattering data; this analogy leads to a general approach to aberration correction. Two related methods for aberration correction are presented: one in which delays are computed from estimates of the medium using an efficient straight-ray approximation, and one in which delays are applied directly to a time-dependent linearized reconstruction. Numerical results indicate that these correction methods achieve substantial quality improvements for imaging of large scatterers. The parametric range of applicability for the time-domain diffraction tomography method is increased by about a factor of 2 by aberration correction.
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影响因子：
2.4
作者：
Hinkelman, LM;Mast, TD;Waag, RC
通讯作者：
Waag, RC
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作者：
HINKELMAN, LM;LIU, DL;STEINBERG, BD
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STEINBERG, BD