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Circular-array ultrasound holography imaging using the linear-array approach

机译:使用线性阵列方法的圆形阵列超声全息成像

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摘要

A circular-array, pulse-echo, ultrasound holography imaging method is presented. The configuration of the measurement system is much simpler than that of traditional computed-tomography (CT) and compound beta -scan imaging. Wide-beam insonification is used. The geometrical differences of the circular array compared with a linear array system are corrected in the frequency domain of the hologram. The computation time of the reconstruction process for a circular image is practically the same as that of a linear array imaging process using the backward propagation (BP) principle. A fast Fourier transform (FFT) algorithm is directly used in the reconstruction process. Computer simulation shows that the resolution of this imaging method can surpass that of a linear-array system. In the preliminary experiments, 2-mm resolution was achieved in both the lateral and radial directions with an ultrasound frequency of 2 MHz.
机译:提出了一种圆形阵列,脉冲回波,超声全息成像方法。测量系统的配置比传统的计算机断层扫描(CT)和复合β扫描成像要简单得多。使用了宽光束声处理。与线性阵列系统相比,圆形阵列的几何差异在全息图的频域中得到了校正。圆形图像重建过程的计算时间实际上与使用反向传播(BP)原理的线性阵列成像过程的计算时间相同。快速傅立叶变换(FFT)算法直接用于重建过程。计算机仿真表明,这种成像方法的分辨率可以超过线性阵列系统的分辨率。在初步实验中,使用2 MHz的超声频率在横向和径向方向都获得了2毫米的分辨率。

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