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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Generation of sinc wave by a one-dimensional array for applications in ultrasonic imaging
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Generation of sinc wave by a one-dimensional array for applications in ultrasonic imaging

机译：一维阵列产生的正弦波用于超声成像

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摘要

A new solution to the 2-D scalar wave equation is presented which describes an ultrasonic beam maintaining the lateral field response expressed by the sinc function over a finite depth of field. This new beam is realizable with a linear array transducer, and less subject to diffraction spreading than conventional focused beams, physically, it is a superposition of plane waves having the same wavelength, but traveling at different angles. It is shown by numerical simulation that the beam can provide more uniform lateral beamwidth and smoother on-axis field magnitude over a greater depth of field than the rectangular transducers and Gaussian apodized transmitters which have been used to increase the limited depth of field of conventional focused beams. Compared with currently developed limited diffraction beams which must be generated by 2-D array transducers, the beam has a wider lateral beamwidth but with lower sidelobe levels. In ultrasonic medical imaging, the beam enables one to obtain a line focus using a 1-D array transducer and to eliminate the diffraction correction required in some applications such as tissue characterization.
机译：提出了一种二维标量波动方程的新解决方案，该解决方案描述了一种在有限景深上保持由Sinc函数表示的横向场响应的超声波束。这种新光束可以通过线性阵列换能器实现，并且与传统聚焦光束相比，其衍射扩展更少，物理上，它是具有相同波长但以不同角度传播的平面波的叠加。数值模拟表明，与矩形换能器和高斯变迹发射机相比，该波束在更大的景深范围内可以提供更均匀的横向波束宽度和更平滑的轴上场强，矩形换能器和高斯变迹发射机已经被用来增加常规聚焦的有限景深梁。与目前必须由二维阵列换能器产生的有限衍射光束相比，该光束具有较宽的横向光束宽度，但旁瓣水平较低。在超声医学成像中，光束使人们能够使用一维阵列换能器获得线聚焦，并消除了某些应用（例如组织表征）中所需的衍射校正。

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