A three-dimensional ultrasonic probe calibration device and method for calibrating a three-dimensional ultrasonic probe

Abstract

The invention relates to a three-dimensional ultrasonic probe calibration device and a method for calibrating a three-dimensional ultrasonic probe, wherein the three-dimensional probe calibration device includes an optical locator, an optical locating probe, an ultrasonic nondestructive flaw detector, a calibration template, a computer and a mechanical arm, and an optical locator. The ultrasonic non-destructive flaw detector is connected to the computer respectively, the optical positioning probe is fixed on the ultrasonic non-destructive flaw detector, the calibration template is a water tank with a plurality of circular tables at the inner bottom, and the top surfaces of the plurality of circular tables are all provided with countersink holes. Compared with the prior art, the present invention proposes an improved calibration template based on optical positioning, obtains the posture and posture information of the optical positioning probe through tracking, and uses a mechanical arm to clamp an ultrasonic nondestructive flaw detector to perform ultrasonic image scanning, And the point target position information is directly obtained from the contact point target of the optical positioning probe, which reduces the operation difficulty of the calibration process, avoids additional calibration of the template point target position information, and improves the calibration accuracy and efficiency.

Description

technical field [0001] The invention relates to the technical field of ultrasonic probe positioning, in particular to a three-dimensional ultrasonic probe calibration device and a method for calibrating a three-dimensional ultrasonic probe. Background technique [0002] 3D ultrasound imaging uses a 3D ultrasound probe to scan an object and record its images, and then reconstruct and visualize the 3D volume of the object. It is a safe, inexpensive, and easy-to-operate nondestructive testing technique. The calibration of the 3D ultrasound probe is a key step to realize the 3D visualization of ultrasound images. The spatial accuracy of the ultrasound system mainly depends on the accuracy of the ultrasound scanning plane relative to the probe marker coordinate system. The 3D ultrasound imaging system usually needs to use the ultrasound probe to image on the template. , and identify its features from the ultrasound image to minimize the residual error between the feature set iden...

AI Technical Summary

Problems solved by technology

[0003] The template based on the point model is one of the widely used models due to its simplicity, easy construction, and accurate imaging, but its disadvantage is that the ultrasonic plane and the target point need to be coplanar, so the existing probe calibration process based on the point model Usually it is tedious and time-consuming, and has high requirements for the operator

The traditional point model generally uses balls or cross lines to form single-point or multi-point targets, so the position of the point target cannot be directly known, and the point target needs to be scanned at multiple angles, requiring a large number of imaging images, so the operator It is necessary to hold an ultrasonic flaw detector, image the intersection point repeatedly, and then iteratively calculate the transformation parameters from the ultrasonic image coordinate system to the probe coordinate system, otherwise the converted parameters will be highly constrained by the optimization process and inaccurate. The ultrasonic image scanning by the flaw detector cannot guarantee the operation stability and imaging clarity. In addition, the iterative method is used to solve the coordinate transformation parameters, and the position information of the template needs to be calibrated in advance, which leads to the introduction of errors.

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