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Three-dimensional photoacoustic imaging method for improving limited visual angle problem

A limited viewing angle, three-dimensional technology, applied in image analysis, image data processing, 3D modeling, etc., can solve problems such as image artifacts, achieve the effects of reducing image blur, avoiding image interpolation, and high degree of parallelization

Active Publication Date: 2020-04-17
NANJING UNIV
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Problems solved by technology

[0003] Purpose of the invention: The technical problem to be solved by the present invention is to provide a three-dimensional photoacoustic reconstruction method based on a hand-held ultrasonic probe for the limited viewing angle problem in photoacoustic imaging, which improves the problem of image artifacts under a single viewing angle

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  • Three-dimensional photoacoustic imaging method for improving limited visual angle problem

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Embodiment Construction

[0044] The invention discloses a three-dimensional photoacoustic imaging method for improving the problem of limited viewing angle, which includes the following steps:

[0045] Step 1, initialize the relevant calculation parameters, including obtaining the relevant parameters of the system, using the calibration board for camera calibration, obtaining the internal parameters of the camera, and measuring the relevant parameters of the calibration board;

[0046] Step 2, fix the calibration plate on the side of the ultrasound probe, initialize the four-dimensional photoacoustic signal matrix, the three-dimensional counter matrix and the three-dimensional image matrix;

[0047]Step 3, obtain the image of the current frame from the camera, identify the position of the calibration plate in the image, obtain the external parameters of the camera, locate the coordinates of the camera coordinate system where the ultrasound probe is located, and obtain the relevant parameters of the cur...

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Abstract

The invention provides a three-dimensional photoacoustic imaging method for improving a limited visual angle problem. The three-dimensional photoacoustic imaging method comprises the following steps:acquiring related parameters of a system, calibrating a camera to acquire camera internal parameters and calibrating plate parameters; fixing a calibration plate on one side of the ultrasonic probe, and distributing photoacoustic signals, a counter matrix and image storage; identifying the calibration plate from the camera image, and positioning the position of the ultrasonic probe; irradiating the target by using a light source, receiving the photoacoustic signal by using a probe, recovering the initial photoacoustic signal pixel by pixel, and updating the photoacoustic signal matrix; enveloping the photoacoustic signal matrix according to a time dimension, obtaining a signal value, updating the signal value to a three-dimensional image matrix, and refreshing image display; gradually moving and rotating the ultrasonic probe to enable the probe to stay at a plurality of positions and angles, and repeating the steps of probe positioning, photoacoustic signal recovery, image matrix updating, display refreshing and the like.

Description

technical field [0001] The invention belongs to the field of photoacoustic imaging and image processing, and in particular relates to a three-dimensional photoacoustic imaging method for improving the problem of limited viewing angle. Background technique [0002] As an imaging method using the photoacoustic effect, photoacoustic imaging reflects the light absorption distribution of substances in the imaging area. However, in the field of photoacoustic imaging, since the handheld ultrasonic line array can only collect photoacoustic data from a single viewing angle or a single plane, there are problems such as image artifacts caused by limited viewing angles in reconstructed images. At the same time, there is currently a lack of a three-dimensional photoacoustic imaging technology based on a handheld linear array to reflect the three-dimensional light absorption distribution of a medium or tissue. The 3D photoacoustic imaging technology simply based on lateral scanning or tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/00G06T7/80
CPCG06T17/00G06T7/80
Inventor 袁杰马翔尤琦樊锴
Owner NANJING UNIV
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