Position calibrating method of medical ultrasonic three-dimensional imaging based on linear scanning

Abstract

The invention discloses a position calibrating method of a medical ultrasonic three-dimensional imaging based on linear scanning, comprising the steps that a rectangular solid with known sizes is used as a scanning object, on the premise of assuming that an angle conversion relationship does not exist between an original ultrasonic image plane and a linear guide rail, a two-dimensional image is subjected to the three-dimensional reconstruction, and then an actual mathematic relationship of the angle and the deformation amount of the reconstructed rectangular solid between the original ultrasonic image plane and the linear guide rail can be calculated; and in the actual calibrating process, the rectangular solid is scanned by a linear scanning method, the sequence of the ultrasonic image is subjected to the three-dimensional reconstruction, the deformation amount of the reconstructed rectangular solid is substituted into a mathematic relationship to calculate the rotation angle between the original ultrasonic image plane (i.e. the position of an ultrasonic probe) and the linear guide rail, and the rotation angle is the calibrating result of the position of the ultrasonic probe in the linear scanning mode. The position calibrating method has the advantages that the simplicity and the easy understanding are realized, the operability is high, the test is simple, and the calibrating is convenient and accurate. The position calibrating method can be used for a three-dimensional ultrasonic imaging system based on a free arm linear scanning method or a mechanical driving linear scanning method.

Description

technical field [0001] The invention belongs to the technical field of image processing and image display of medical ultrasound, and in particular relates to a position calibration method of three-dimensional medical ultrasound imaging based on linear scanning. Background technique [0002] Medical ultrasound diagnosis is an important part of modern imaging medicine, and it is of great value in the pathological diagnosis of many tissues in the human body (such as heart, liver, neurovascular, etc.). Among them, three-dimensional ultrasound imaging technology has been more and more used in ultrasound diagnosis because of its intuitive image display and high diagnostic accuracy. At present, the scanning methods commonly used in medical 3D ultrasound imaging include: mechanical positioning parallel scanning, sector scanning, rotating scanning and free-arm (Free-Hand) scanning. Before the 3D reconstruction of the original ultrasound image sequence, the positional relationship be...

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Problems solved by technology

It is more complicated to make such a calibration phantom. Therefore, it is of great practical significance to design a position calibration method t...

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