Ultrasonic detection image three-dimensional calibration method

Abstract

The invention relates to an ultrasonic detection image three-dimensional calibration method. According to the method, posture information of an ultrasonic probe is obtained in real time through a receiver on the ultrasonic probe, so that the coordinate of any point, including a cotton line intersection point, in a template can be converted into a receiver coordinate system; an ultrasonic image of the cotton line intersection point is obtained by scanning the cotton line intersection point in the mesh-shaped template through the ultrasonic probe; space vectors are built through the cotton line intersection point in the template, the coordinate of a cotton line intersection point imaging point in the ultrasonic image is calculated according geometric characteristics between the space vectors in the template, and accordingly the relation between the receiver coordinate system Or and a probe scanning image coordinate system Oi is calculated and positioned by means of least square matching of the same point. Compared with the prior art, the coordinate of the same point in an image coordinate system is calculated through the relation of the space vectors, human factor influences caused when the coordinate of the same point of the image is obtained manually in the prior art are avoided, and accordingly the method has the advantages of being high in calibration precision and reconstruction precision, high in calibration speed and the like.

Description

technical field [0001] The invention relates to the technical field of ultrasonic calibration, in particular to a three-dimensional calibration method for ultrasonic detection images. Background technique [0002] Three-dimensional (3-D) ultrasound calibration is an indispensable key step in the 3-D visualization of ultrasound images, because a series of non-parallel and irregular two-dimensional (2-D) ultrasound images are obtained by hand-held ultrasound probe Freehand sampling, only Starting from the 2-D image information obtained by the ultrasound probe, the geometric information in the corresponding 3-D space is calculated, and then a regular parallel image sequence is generated from this, so that subsequent 3D reconstruction and target segmentation can be performed. This calibration calculation process is called 3-D ultrasound calibration, which is usually achieved by fixing the positioning tracking device on the ultrasound probe and calculating the azimuth relationshi...

AI Technical Summary

Problems solved by technology

Among them, the coordinates of the homologous points in the image coordinate system rely on manual picking from the image, which inevitably brings about the impact of human factors on the calibration accuracy

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