Method for optimizing ultrasonic probe imaging plane space position calibration

Abstract

The invention discloses a method for optimizing ultrasonic probe imaging plane space position calibration and belongs to the field of medical ultrasonic three-dimensional imaging and ultrasonic image fusion. The method is an optimizing method for calibrating the transformation relation of the space position of an ultrasonic probe imaging plane and the space position of a space position sensor, namely the space transformation matrix. Under the assisting of a three-dimensional positioning system, the method includes steps of: 1, constructing a three-dimensional positioning system; 2, manufacturing an N-line model; 3, building a coordinate system set of the positioning system; 4, calibrating a placing space position of a water tank model; 5, collecting ultrasonic images under different positions; extracting N-line marks and calculating the ultrasonic plane position; 7, mapping N-line mark points on the ultrasonic images onto a three-dimensional space plane; 8, performing registering on three-dimensional coordinate points on the imaging plane and an N line on the water tank model; 9, performing optimization calculation; and 10, calculating the optimum transformation between an imaging plane and the position sensor. The method has the advantages of reducing errors in space position calibration of the imaging plane.

Description

Technical field: [0001] The invention belongs to the field of medical ultrasonic three-dimensional imaging and ultrasonic image fusion, and its specific applications include three-dimensional medical ultrasonic imaging, and spatial registration fusion imaging of medical ultrasonic images and other modes of images (such as CT and MRI). Background technique: [0002] As a nondestructive, real-time, and cheap imaging examination, medical ultrasound images have been widely used in medicine. At present, the ultrasound examination widely used in clinical practice adopts the B-mode imaging mode, commonly known as "B-ultrasound". B-type imaging obtains two-dimensional tomographic images that change in real time over time. Doctors rely on their understanding of human anatomy to form a judgment in their minds about whether the internal three-dimensional structure of the human body is normal or not. With the development of medical imaging technology, 3D ultrasound imaging has attracted...

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Problems solved by technology

However, such methods require additional processing steps and require the use of a modified N-line model. See Hsu PW, Prager RW, Gee AH, et al. Real-time freehand3D ultrasound calibration. Ultrasound in medicine & biology. 2008, 34( 2): 239-251; In addition, this method first assumes that other position components except the imaging thickness direction are accurate after conventional calibration, but this assumption may not be true in most practical applications

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