Lingvall Fredrik
Department of Engineering Sciences, Signals and Systems Group, Uppsala University, Box 528, 751 20 Uppsala, Sweden.
Ultrasonics. 2004 Apr;42(1-9):961-8. doi: 10.1016/j.ultras.2003.12.016.
In this paper a beamforming method for ultrasonic array imaging is presented that performs both spatial and temporal deconvolution based on a minimum mean square error (MMSE) criteria. The presented MMSE receive mode beamformer performs a regularized inversion of the propagation operator for the ultrasonic array system at hand. The MMSE beamformer accounts for the transmit and receive processes, defined in terms of finite array element sizes, transmit focusing laws and electrical transducer characteristics. The MMSE beamformer is compared to the traditional delay-and-sum (DAS) beamformer with respect to both resolution and signal-to-noise ratio. The two algorithms are compared using both simulated and measured data. The simulated data was obtained using ultrasonic field simulations and the measured data was acquired using a linear phased array imaging wire targets in water. The results show that the MMSE beamformer has superior temporal and lateral resolution compared to DAS. It is also shown that the MMSE beamformer can be expressed as a filter bank, which enables parallel processing at high frame rates.
本文提出了一种用于超声阵列成像的波束形成方法，该方法基于最小均方误差（MMSE）准则进行空间和时间去卷积。所提出的MMSE接收模式波束形成器对手头的超声阵列系统执行传播算子的正则化反演。MMSE波束形成器考虑了发射和接收过程，这些过程根据有限的阵列元件尺寸、发射聚焦定律和电换能器特性来定义。在分辨率和信噪比方面，将MMSE波束形成器与传统的延迟求和（DAS）波束形成器进行了比较。使用模拟数据和测量数据对这两种算法进行了比较。模拟数据是通过超声场模拟获得的，测量数据是使用线性相控阵成像水中的线目标采集的。结果表明，与DAS相比，MMSE波束形成器具有更好的时间和横向分辨率。还表明，MMSE波束形成器可以表示为一个滤波器组，这使得能够以高帧率进行并行处理。
