Method and device for measuring displacement of targets in images and carrying out strain and strain rate imaging

Abstract

The invention discloses a method and a device for tracking and measuring the displacement of targets in image sequences and a method and a device for carrying out strain and strain rate imaging according to the measured displacement. The method mainly comprises the following steps of: a construction step: constructing energy functions by utilizing image gray level information, high order information and displacement spread functions; a resolving step and a solving step, wherein the resolving step is used for resolving images into at least two resolutions, and the solving step is used for solving the exact solutions of the energy functions on images with the lowest resolution, solving the high frequency exact solutions of the energy functions on images (excluding the images with the lowest resolution) with other resolutions and carrying out roundabout solving on the images with different resolutions so as to obtain the displacement of the targets in the images. Not only can linear motion be described but also the nonlinear motion can be described according to the method and the device. Moreover, the method and the device are not easy to be disturbed by noise and the gray level changes of the images.

Description

technical field [0001] The invention relates to a method and device for tracking and measuring the displacement of an object in an image sequence, and a method and device for imaging strain and strain rate according to the measured displacement. Background technique [0002] In ultrasound diagnosis, strain rate imaging is of great significance for assessing cardiac function. Strain refers to how much an object deforms, while strain rate refers to how quickly this deformation changes. When it comes to the application of the heart, the strain refers to the degree of deformation of the myocardium, and the strain rate refers to the speed of the deformation of the myocardium. Generally, deformations are obtained by tracking the velocities of similar bright spots on the myocardium and calculating the difference in velocities. Therefore, it is important to track and measure the velocity of myocardial tissue if the strain and strain rate of the myocardium are to be calculated. ...

AI Technical Summary

Problems solved by technology

But this method is still hampered by poor image quality in the ultrasound field

[0005] Therefore, there is a need for a new method for detecting two-dimensional and three-dimensional motion of objects, which must not only overcome the shortcomings of the template matching method to only describe linear motion, but also overcome the problem that the optical flow method is easily disturbed by noise and image grayscale changes.

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