Three-dimensional Ultrasonic Imaging Method Based on Non-diffraction Wave in Sector Scanning Mode

Abstract

The invention discloses a three-dimensional ultrasonic imaging method based on non-diffraction waves in a sector scanning mode. According to the method, under the control of a data processing unit, an ultrasonic emitting circuit drives an ultrasonic sensor array to emit non-diffraction ultrasonic waves or plane ultrasonic waves sound fields, and in addition, sector rotation is carried out for completing the scanning of image targets; the data processing unit carries out integral processing on all received data r (Theta, z<r>, t) to obtain an image f (x, y, z) of a target, wherein t is the time, (Epsilon, Theta and z) are cylindrical coordinates, and (x, y and z) are spatial rectangular coordinates. The three-dimensional ultrasonic imaging method provided by the invention has the advantages that the adopted imaging mode can realize the imaging of both the outer side and the inner side of the cylindrical scanning surfaces, the characteristics of high imaging speed and high imaging quality can be realized in the existing all 3D ultrasonic imaging methods, and good application prospects are realized.

Description

Technical field: [0001] The invention belongs to the field of medical ultrasonic imaging, and in particular relates to a three-dimensional ultrasonic imaging method based on non-diffraction waves in a sector scanning mode. Background technique: [0002] Medical ultrasound imaging technology has the characteristics of no radiation, no trauma, and low cost. It plays an irreplaceable role in modern medical imaging technology, such as prenatal examination for pregnant women. [0003] Currently, the B-mode ultrasound imaging system is widely used. However, with the development of technology, people put forward more demands on the ultrasound imaging system, and the traditional B-mode ultrasound imaging system shows certain limitations. [0004] 3D imaging can give the 3D structure of the imaging tissue, provide richer image information than 2D imaging, effectively improve the accuracy of clinical diagnosis, and can be applied to surgical navigation. Therefore, three-dimensional ...

AI Technical Summary

Problems solved by technology

Its main deficiency is: the resolution of the imaging system is poor, especially the resolution of the moving direction of the sensor is very poor. In fact, the sound field of the sensor cannot be limited to one section. The received signals of the sensor at different sections include not only the image information of this section, but also the image information of other sections.

Therefore, the spatial resolution of this 3D imaging method is naturally not good, especially in the direction of movement.

In addition, in order to obtain a high-quality slice image, it is necessary to transmit and receive multiple times to complete a frame of slice imaging, which makes a very large number of transmission and reception processes required to achieve a frame of volume imaging, thereby reducing the frame rate.

[0007] Theoretically, 3D imaging with higher spatial resolution and frame rate can be obtained by using 2D sensors, but due to the complex structure of 2D sensors, it is difficult to complete the design and production of high-quality 2D sensors with the existing process and technology level

At present, the imaging using 2D ultrasonic sensors is mainly to balance the frame rate and resolution, to increase the frame rate under the premise of loss of resolution, or to increase the resolution under the premise of loss of frame rate, it is difficult to improve both indicators at the same time

[0008] In order to solve the above technical problems, we have proposed a high frame rate ultrasonic imaging method based on finite diffracted waves. This imaging method uses a one-dimensional sensor for linear scanning, and can perform three-dimensional rectangular imaging of the tissue area. It has high imaging resolution and high imaging efficiency. Fast speed and other advantages, but the scanning surface of this method is a plane instead of a fan-shaped surface, which cannot meet the requirements of some medical imaging

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