Position estimation method of ultrasonic elastography two-dimensional axial displacement estimation window

Abstract

The invention discloses a position estimation method of an ultrasonic elastography two-dimensional axial displacement estimation window, which comprises the following steps of: 1, setting an initial position of the center of the axial displacement estimation window as a displacement estimation sampling point; 2, generating a position coordinate of the axial displacement estimation window by using an iteration method; 3, using a coordinate generated by iteration as a coordinate of a center point of the displacement estimation window, and taking the two-dimensional window with the point as the center carrying out axial displacement estimation; and 4, carrying out gradient operation on a displacement estimation value to generate an elastic image. According to the invention, by adopting a new position estimation algorithm of the two-dimensional estimation window, the displacement estimation is carried out on the two-dimensional estimation window so that a more accurate displacement of a preset sampling point can be generated, and the influence of signal amplitude random fluctuation and signal compression to displacement estimation is avoided, therefore, amplitude modulation noise of elastography is effectively inhibited, strain texture fluctuation is avoided being caused, and the elastography quality and quality are improved.

Description

technical field [0001] The invention belongs to the technical field of medical ultrasonic engineering, and in particular relates to a method for estimating the position of a two-dimensional estimation window when axial displacement is estimated in ultrasonic elastography. Background technique [0002] Ultrasound elastography is a new imaging mode that generates tissue elastic characteristic information through the correlation analysis of ultrasonic echoes before and after compression and displays them in images. Because it can reflect changes in tissue elasticity parameters, this imaging mode has become an important tool for clinical detection and diagnosis of various diseases, such as breast cancer, prostate cancer, thyroid nodules, and liver fibrosis. [0003] The ultrasound elastography process usually includes three steps: displacement estimation, strain estimation, and display post-processing. Displacement estimation is the core link in elastography, and its estimation...

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Problems solved by technology

This method can improve the quality of imaging to a certain extent, but the strain generated by this method is not the strain at the preset point, so it will cause image texture fluctuations

[0007] (3) Although the use of one-dimensional window for displacement estimation reduces the calculation time consumption and improves the real-time performance and frame rate of imaging, due to the lateral movement of the tissue during the extruded tissue and the de-correlation of the signal before and after compression, the one-dimensional Wrong window matching may occur during window displacement estimation, resulting in a horizontally discontinuous elastic image

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