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Opto-acoustic image optimization method by use of inverse convolution operation

A technology of photoacoustic image and optimization method, which is applied in the direction of image detector method, image signal processing, image enhancement, image analysis, etc., can solve the problem of low photoacoustic signal signal-to-noise ratio, photoacoustic image is prone to artifacts, and cannot widely used and other issues

Active Publication Date: 2018-09-25
NANJING UNIV +1
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Problems solved by technology

However, due to the low signal-to-noise ratio of the photoacoustic signal, the reconstructed photoacoustic image is prone to artifacts, so this technology cannot be widely used at present.

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  • Opto-acoustic image optimization method by use of inverse convolution operation
  • Opto-acoustic image optimization method by use of inverse convolution operation
  • Opto-acoustic image optimization method by use of inverse convolution operation

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Embodiment Construction

[0042] Such as figure 1 As shown, the present invention provides an image optimization method that can improve image quality and ensure reconstruction speed and efficiency without loss of information, including the following steps:

[0043] Step 1: Using the photoacoustic data acquisition equipment shown in Figure 2 below, the extremely thin object is approximately regarded as an ideal point source, and the point source is irradiated with a pulsed laser, and the sound pressure signal p is received by an array sensor at the same time d (r 0 , t), where r 0 is the sensor coordinate vector parameter, t is the time parameter;

[0044] Step 2, the group of signals includes N channel data. Under normal circumstances, ignoring the delay difference, the waveform of each channel data can be regarded as consistent, so the useful signal segment of any channel is intercepted, and the signal segment can be regarded as The thermal expansion characteristics of biological tissue and the to...

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Abstract

The invention discloses an opto-acoustic image optimization method by use of inverse convolution operation. The method comprises following steps of by acquiring an opto-acoustic signal of a point source, obtaining an inverse convolution core; acquiring a to-be-processed signal; estimating a signal to noise ratio of the to-be-processed signal; using the Norbert Wiener inverse convolution method, carrying out inverse convolution processing on the to-be-processed signal; and by taking the signal subjected to the inverse convolution as input, carrying out image reconstruction and after gray scalenonlinear conversion processing, obtaining the final optimized image. According to the invention, based on problems o low opto-acoustic imaging resolution and serious ghosts, optimization is performed; through the inverse convolution operation, signal deformation caused by balance characteristics of thermal expansion of biological tissues and effects of an acquisition system is eliminated; and imaging quality is optimized while the reconstruction speed and efficiency can be ensured.

Description

technical field [0001] The invention belongs to the field of photoacoustic signal processing and imaging, in particular to an optimization method for photoacoustic imaging. Background technique [0002] In recent years, photoacoustic imaging is an emerging imaging technology with broad application prospects, and related research has become increasingly extensive and in-depth. This is because photoacoustic imaging combines the advantages of pure optical imaging and ultrasound imaging, and can achieve high contrast and spatial resolution while ensuring a certain imaging depth. At the same time, compared with the current mainstream ultrasound imaging, the cost of photoacoustic imaging equipment is lower, and it has a very high application value. However, due to the low signal-to-noise ratio of the photoacoustic signal, the reconstructed photoacoustic image is prone to artifacts, so this technology cannot currently be widely used. At the same time, improving the image resoluti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T5/20G01N21/17
CPCG06T5/20G01N21/17G01N21/1702G01N2021/1765G06T2207/10132G06T5/00
Inventor 袁杰郭成雯朱昀浩刘晓峻程茜王学鼎
Owner NANJING UNIV