调频信号发射超声成像的参数优化与成像实验

研究调频信号发射超声成像中影响成像质量的各种参数,提高现有超声图像的信号噪声比.用仿真计算和声学实验来研究不同调频超声信号发射参数下的成像质量.增加超声发射能量,提高图像的信号噪声比;同时,采用相关算法对接收的超声信号解码,保证图像的轴向精度不会下降.优化了调频信号发射超声成像的发射参数,并得到了仿体的B型超声图像,此图像的质量优于传统成像方法的图像质量.该成像方法能够提高超声图像的信号噪声比,尤其是提高超声衰减严重的深部组织图像的信号噪声比.

Parameter Optimization and Imaging Experiment of Frequency Modulated Signal Transmitting Ultrasound Imaging

Parameters that affect image quality in frequency-modulated(FM) signal transmitting ultrasound imaging were investigated in order to increase signal-to-noise ratio(SNR) of the present ultrasound image.The simulated calculation and acoustical experiment were completed to investigate the image quality with various parameters of FM ultrasound signal transmitting.The energy of transmitting ultrasound was increased,and the SNR was increased too.Meantime,the convolution arithmetic was used to decode the received ultrasound signal in order to ensure that the axial image resolution was not decreased.The transmitting parameters of FM signal transmitting ultrasound imaging were optimized and the phantom B-mode ultrasound image was obtained by the method.The quality of the image is better than that of the traditional B-mode image.The SNR of ultrasound image could be increased by FM signal transmitting method.Especially,the SNR of deeper tissue image could be increased more,where the ultrasound signal is attenuated severely.