Acoustic velocity inhomogeneous medium thermoacoustic imaging reconstruction algorithm

A homogeneous medium and thermoacoustic imaging technology, which is applied in ultrasonic/acoustic/infrasonic diagnosis, acoustic diagnosis, infrasonic diagnosis, etc., and can solve problems such as slow reconstruction speed

Inactive Publication Date: 2008-07-09
FUDAN UNIV
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Problems solved by technology

Currently the only method that does not require prior knowledge of the sound velocity distribution [4] It is b...

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  • Acoustic velocity inhomogeneous medium thermoacoustic imaging reconstruction algorithm
  • Acoustic velocity inhomogeneous medium thermoacoustic imaging reconstruction algorithm
  • Acoustic velocity inhomogeneous medium thermoacoustic imaging reconstruction algorithm

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Embodiment Construction

[0044] In order to verify the method of the present invention, a simulation experiment in a two-dimensional situation is carried out on a computer. Although the theoretical demonstration of the present invention is carried out in a three-dimensional situation, it is obviously also valid to apply it to a two-dimensional situation. The specific steps of the simulation experiment and the results of each step are as follows:

[0045] 1. Establish a model of the sample to be tested. Figure 2 shows the electromagnetic wave absorption distribution and sound velocity distribution (m / s) of the tissue to be measured. This sound velocity distribution is similar to a female breast model [1] . The size of Figure 2 is 18mm×18mm. The influence of other parameters of the tissue to be measured (such as isobaric expansion coefficient and specific heat) on the imaging algorithm is reflected in the constants η, η 2 , its selection may not be consistent with the real situation, here it is sim...

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Abstract

The invention belongs to the thermoacoustic imaging technology field, in particular to an image reconstruction algorithm of the sound velocity uneven medium thermoacoustic imaging. The method modifies the time domain reconstruction method of the sound velocity uneven medium thermoacuostic imaging, which leads to that the propagation time of acoustic waves between two points in medium is no longer proportional to the distance and is worked out through the estimated sound velocity distribution. Currently, the prior knowledge of the sound velocity distribution is mostly required by the reconstruction algorithm on the sound velocity uneven medium thermoacuostic imaging. And an iterative method is adopted for the calculation and the speed is slow. The invention does not require the prior knowledge of the sound velocity distribution in the medium and is a direct inverse approach. The invention can rapidly reconstruct a whole thermoacoustic image.

Description

technical field [0001] The invention belongs to the technical field of thermoacoustic imaging, in particular to an image reconstruction algorithm for thermoacoustic imaging of a medium with inhomogeneous sound velocity. technical background [0002] Thermoacoustic imaging (often also called photoacoustic imaging) combines the advantages of high contrast of optical imaging and high resolution of ultrasonic imaging. It has developed rapidly in recent years and has become a new type of non-destructive medical imaging technology that has been widely concerned. Thermoacoustic imaging is very suitable for tumor detection, blood vessel imaging and other directions, and has also been tried to be applied to the structural and functional imaging of the mouse brain, molecular imaging, flow velocity detection and other directions. [0003] In thermoacoustic imaging, biological tissue undergoes thermal expansion after being irradiated by pulses of electromagnetic waves (commonly microwav...

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Application Information

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IPC IPC(8): A61B8/00A61B5/00
Inventor 汪源源张弛
Owner FUDAN UNIV
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