Golay code-based ultrasonic elastography strain estimation method

Abstract

The invention discloses a Golay code-based ultrasonic elastography strain estimation method. The method comprises the following steps: (1) double-phase coding sequences of a pair of Golay codes are employed, and oversampling and modulation are performed on the double-phase coding sequences; (2) while human tissues are gently extruded by using a probe, a pair of Golay code modulation signals is transmitted; (3) echo signals are decoded by using a matching filter; (4) echo decoded signals before and after compression are divided into a plurality of sub-band signals by using a sub-band division method; (5) strain estimation is performed on each sub-band signal; and (6) weighted averaging is performed on all sub-strain images to obtain a final composite strain image. The ultrasonic elastography strain estimation method solves the problems that the energy is low, the penetration distance is short and the imaging distance is shallow due to the fact that an existing quasi-static ultrasonic elastography system uses a short signal as an excitation signal, and solves the problem that the quality of the strain image obtained by the short signal at the depth of a human tissue or under the condition of a low system signal-to-noise ratio.

Description

Technical field[0001]The invention relates to the technical field of medical ultrasound imaging, in particular to an ultrasound elastography strain estimation method based on Golay codes.Background technique[0002]The elastic property of human tissue is an inherent property in human tissue, and it is a very important property in the mechanical properties of human tissue. The elasticity of human tissue is generally expressed by elastic modulus. The magnitude of the elastic modulus reflects the hardness of the human tissue, and reflects the difficulty of the elastic deformation of the human tissue. The elastic modulus of each organ in human tissue is different. When a certain organ of the human body suffers from a disease, the hardness of the organ will change, resulting in a different elastic modulus. When a certain organ of the human body develops and becomes diseased, the change in the hardness of the organ is closely related. For example, breast tumors will harden in the correspond...

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Problems solved by technology

[0007] In order to overcome the problems in the background technology, the present invention proposes a Golay code-based ultrasonic elastography strain estimation method to solve the problem of low energy, short penetration distance, The problem of shallow imaging distance can solve the problem that the signal-to-noise ratio of the ultrasonic echo signal obtained is low when the short signal is deep in human tissue or under the condition of low system signal-to-noise ratio or high-attenuation of the ultrasound, and the elastic signal-to-noise ratio of the obtained strain image and Low contrast-to-noise ratio and poor quality of strain images

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