高性能合成孔径超声成像方法研究
发布时间：2019-01-16 05:44
【摘要】：合成孔径超声成像作为一种超声后处理方法,能够将小孔径成像合成为大孔径成像,通过逐点聚焦的方法,使图像的分辨率不随位置和深度变化。在采用同样换能器阵元探头的情况下,使用合成孔径技术能够得到更高分辨率的图像。对于单阵元换能器来说,合成孔径技术可以克服其在成像中出现的景深限制和在聚焦范围外信噪比和横向分辨率较低等缺点,产生一个深度独立的横向分辨率,有效的改善单阵元换能器的成像质量。本文重点研究了合成孔径超声成像方法,主要工作如下：(1)对合成孔径成像算法进行研究,并对一些常用的合成孔径成像方法进行了波束仿真实验。(2)使用Field Ⅱ仿真软件,对聚焦型单阵元换能器和非聚焦型换能器进行散射点的仿真实验和应用合成孔径聚焦算法的仿真实验。并通过计算各个散射点的横向和轴向分辨率,来评估成像质量。(3)使用基于FPGA开放式超声平台,采集水平位移平台对钨丝线进行扫描成像的数据,并在matlab中进行直接显示和经合成孔径聚焦技术处理后进行显示。并对成像分辨率进行计算更直观的分析实验结果。同时对水平位移平台采集到的离体猪小肠切片的超声回波数据,进行显示和对其进行合成孔径聚焦处理,并对其进行比较分析。(4)使用基于FPGA开放式超声平台,采集旋转平台对钨丝线仿体进行扫描成像的数据,并在matlab中进行直接显示和经合成孔径聚焦技术处理后进行显示。并对实验结果进行简单的分析。(5)对超快超声成像进行研究,并用Field Ⅱ进行平面波相干合成仿真实验。分别对多个散射点进行平面波仿真实验,和对计算机囊肿组织仿体进行平面波的仿真实验。
[Abstract]:As a kind of ultrasonic post-processing method, synthetic aperture ultrasonic imaging can transform small aperture imaging into large aperture imaging. By focusing point by point, the resolution of the image does not change with the position and depth. In the case of the same transducer array element probe, a higher resolution image can be obtained by using synthetic aperture technique. For single array transducer, synthetic aperture technique can overcome the limitation of depth of field and low signal-to-noise ratio (SNR) and lateral resolution outside the focus range, and produce a depth-independent lateral resolution. The imaging quality of single element transducer is improved effectively. The main work of this paper is as follows: (1) the synthetic aperture imaging algorithm is studied. Some commonly used synthetic aperture imaging methods are simulated by beam simulation. (2) Field 鈪，
本文编号：2409525
[Abstract]:As a kind of ultrasonic post-processing method, synthetic aperture ultrasonic imaging can transform small aperture imaging into large aperture imaging. By focusing point by point, the resolution of the image does not change with the position and depth. In the case of the same transducer array element probe, a higher resolution image can be obtained by using synthetic aperture technique. For single array transducer, synthetic aperture technique can overcome the limitation of depth of field and low signal-to-noise ratio (SNR) and lateral resolution outside the focus range, and produce a depth-independent lateral resolution. The imaging quality of single element transducer is improved effectively. The main work of this paper is as follows: (1) the synthetic aperture imaging algorithm is studied. Some commonly used synthetic aperture imaging methods are simulated by beam simulation. (2) Field 鈪，
本文编号：2409525
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