Ultrasonic probe calibration system and method based on locatable puncture needle

Abstract

The invention discloses an ultrasonic probe calibration system and method based on a locatable puncture needle. The calibration method includes the steps that S1, a calibration model is designed and manufactured; S2, calibration model feature points in an ultrasonic image are extracted; S3, a calibration transformational matrix is solved according to the calibration feature points extracted from the ultrasonic image. The calibration problem of a tracking and locating ultrasonic probe in the current ultrasonic guidance interventional therapy and a free-type three-dimensional ultrasonic imaging system can be solved, so that more accurate calibration accuracy and more convenient calibration operation are obtained, and ultrasonic calibrated accurately can effectively improve the quality of the three-dimensional ultrasonic reconstructed image and improve safety and the success rate of operations.

Description

technical field [0001] The invention relates to the technical field of medical equipment and ultrasonic testing, and in particular, to an ultrasonic probe calibration system and method based on a positionable puncture needle. Background technique [0002] In ultrasound-guided interventional therapy and surgery, the spatial position of the ultrasound probe needs to be tracked by a three-dimensional spatial positioning system, and unified into the same coordinate system with the surgical instruments being tracked at the same time, so that the posture and position of the instrument can be accurately displayed on the ultrasound image, presented to the doctor. The technology of tracking the ultrasound probe with a three-dimensional positioning system is also applied to the acquisition and reconstruction of free-form three-dimensional ultrasound images. In order to be able to track the imaging plane extending from the ultrasound probe, the transformation relationship from the coo...

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Problems solved by technology

[0007] Among the existing ultrasonic probe calibration methods, the first type of calibration method based on point phantoms has the following problems: since the thickness of the ultrasonic velocity is limited, it is difficult to align the ultrasonic probe directly to the center of these characteristic spheres, And when the probe is not directly aimed at the sphere, the sphere may also appear on the corresponding ultrasound image

The second type of method based on the phantom has the following problems: it is required that the ultrasonic imaging plane just passes through the feature plane of the phantom, which requires high calibration operations for the operator, and the extraction of feature points on the phantom is inconvenient

The problem of the third type of calibration method based on the correlation of image feature points is: because there are many speckle noises in the ultrasound image, it is difficult to accurately segment out the feature points in the image and match them, so the calibration of this type of method Relatively low precision

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