Ultrasonic Harmonic Quantification Imaging Based On Nakagami Distribution Feature Parameters

Ultrasound imaging technology is an important clinical tool for examining the internal structure of biological tissue.Nowadays,the B-type ultrasonography method is based on the analysis of the whole backscatter signal.Along with the theory of linear acoustics,the amplitude information of the fundamental wave component in the ultrasonic echo signal is used to image,and the morphological description is provided for the internal organs and organs of the human body.However,the ultrasonography is a nonlinear process.The effects of nonlinear effects can not be neglected in clinical diagnosis,and the description of B-ultrasonography on the morphology of tissues and organs can no longer meet the needs of people under the rapid economic development.In this paper,the Nakagami distribution statistical model is used to quantify the envelope information of the second harmonic components in the ultrasonic echo signal.Firstly,the nonlinear coefficient distribution model is constructed,and the corresponding fundamental image and the second harmonic image are generated by the simulation of the random RF image simulation software CREANUIS.Then,the nonlinear simulation data processing is processed by MATLAB: First,Butterworth)high-pass filter for the entire ultrasonic echo signal for the separation of fundamental and harmonic components,and then use the Hilbert transform(Hilbert),respectively,to obtain the basic harmonic envelope detection signal,and further logarithmic compression,difference processing Finally,the Nakagami distribution statistical model is used to calculate the Nakagami parameters of the second harmonic and the pseudo-color processing is carried out to obtain the visible second harmonic Nakagami Parameter quantification of pseudo-color images.By observing the second harmonic gray scale image,it can be concluded that the higher the nonlinear coefficient is,the higher the second harmonic amplitude is,and the higher the nonlinear coefficient is,the brighter the second harmonic gray scale image.And the grayscale image of the fundamental wave completely ignores the influence of the nonlinear effect in the ultrasonic propagation process,and the image has no difference in brightness.Then,the quantized pseudo color image of the second harmonic Nakagami parameter is compared with the second harmonic gray scale image.It is shown that the quantized pseudo color image of the parameters ? and ? can reflect the change of the nonlinear coefficient more intuitively.In the clinical examination Quantitative pseudo-color images can show the structural and pathological changes of tissues and organs more clearly.In conclusion,the method proposed in this paper is simple and easy to implement,and the Nakagami distribution parameter quantification pseudo-color imaging is carried out by using the envelope statistical information of the second harmonic component of the ultrasonic echo signal to improve the diagnosis and treatment of the disease of the patient.Post-care are of great significance.