Study On The Measuremet Of Ultrasound Attenuation Coefficient Using Tissue Mimicking Material

Ultrasonic attenuation coefficient is playing an important part in tissue characterization and having been extensively studied by scholars. At present, the diffuse lesions using ultrasound to diagnosis disease is difficult, however, the ultrasound attenuation coefficient of tissue lesions will change from the normal range. Therefore, we can estimate the ultrasonic attenuation coefficient to achieve the purpose of disease diagnosis. According to the acoustic characteristics of tissue mimicking material, this paper mainly studies the ultrasonic attenuation coefficient estimation algorithm and its influencing factors, the main work as follow:(1) According to the two kinds of frequency domain common attenuation estimation algorithms, we using the simulation software test the algorithm estimation results from equipment parameters (center frequency, bandwidth, sampling rate), tissue mimicking material samples acoustic character (acoustic backscatter intensity, velocity) and noise sensitivity respects. The final experimental results show that the bandwidth, phantom velocity and noise have a big impact on the attenuation coefficient estimation method.(2) A new improved attenuation estimation algorithm based on spectral difference is proposed. The method uses the correlation coefficient segment the echo signal, and then utilizes the window to obtain the data, and calculates the power spectrum difference of each data segment, finally estimates the ultrasonic attenuation coefficient.In order to test the improved algorithm,we make the tissue mimicking material to do the real experiment and discuss the effect of data filtering and different window function. The experimental results show that the improved method has better accuracy.