Opto-acoustic image reconstruction prefilter based on Renyi entropy

A photoacoustic image and filter technology, applied in the field of signal processing, can solve the problems of high subjectivity, large influence of output signal-to-noise ratio algorithm decomposition scale, image artifacts, etc. Improve, improve the effect of quality

Inactive Publication Date: 2017-09-19
TAIYUAN UNIV OF TECH
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Problems solved by technology

For example, the filter back projection reconstruction algorithm proposed by Zeng Yaguang of South China Normal University in 2005 can properly improve the intensity and signal-to-noise ratio of the reconstructed photoacoustic signal, but it will also bring about image artifacts; Song Zhiyuan of Tianjin University In 2008, proposed to restore the photoacoustic signal by using the regularization method. This algorithm provides an effective way to reproduce the light absorption distribution structure i

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  • Opto-acoustic image reconstruction prefilter based on Renyi entropy
  • Opto-acoustic image reconstruction prefilter based on Renyi entropy
  • Opto-acoustic image reconstruction prefilter based on Renyi entropy

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Embodiment 1

[0036] The photoacoustic signal of the hair is processed by using the pre-filter of the present invention. When collecting photoacoustic signals on the imaging plane of the ultrasonic transducer, choose to scan with a step of 1°. The detector collects 10,000 points at each position and then rotates to the next position to perform a full-angle circular scan. After the scanning result enters the oscilloscope, the collected photoacoustic signal is filtered by the pre-filter of the present invention. First, the Hanning window function is used in the formula (1) to calculate the time-frequency distribution of the hair silk photoacoustic signal. According to the formula (2) and selecting α=2 to calculate the 2nd-order Renyi entropy value corresponding to each photoacoustic signal point of the hair, based on the frequency of occurrence of each entropy value, the histogram corresponding to the Renyi entropy of the hair silk photoacoustic signal is obtained, Such as figure 2 shown i...

Embodiment 2

[0038] The photoacoustic signal of the mouse cerebral cortex blood vessel is processed by using the pre-filter of the present invention. When collecting ultrasonic signals on the imaging plane of the ultrasonic transducer, choose to scan with a step of 2°. The detector collects 5000 points at each position and then rotates to the next position to perform a full-angle circular scan. After the scanning results are entered into the oscilloscope, the collected photoacoustic signals of cerebral cortex vessels of the mouse are filtered by the pre-filter of the present invention. First, the Hamming window function was used in formula (1) to calculate the time-frequency distribution of the photoacoustic signal of the blood vessels in the mouse cerebral cortex. According to the formula (2), select α=3 to calculate the third-order Renyi entropy value corresponding to each photoacoustic signal point of the cerebral cortex of the mouse. Based on the frequency of each entropy value, the ph...

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Abstract

The invention belongs to the signal processing field, and specifically relates to clutter filtering on opto-acoustic signals through Renyi entropy so as to improve signal to noise ratio and opto-acoustic imaging quality of the opto-acoustic signals. The opto-acoustic image reconstruction prefilter based on Renyi entropy includes the following steps: 1) acquiring opto-acoustic signals; 2) performing time frequency distribution solution on the opto-acoustic signals; 3) performing Renyi entropy solution on each opto-acoustic signal point; 4) determining the threshold; 5) performing filtering processing; and 6) performing image reconstruction on the opto-acoustic signals which are processed through filtering. Compared with the prior art, the opto-acoustic image reconstruction prefilter based on Renyi entropy has the following advantages: 1) the signal to noise ratio of the reconstructed image is obviously improved when opto-acoustic image reconstruction is performed through the opto-acoustic signals which are processed by the prefilter; and 2) the mean square error of the reconstructed image is obviously reduced when opto-acoustic image reconstruction is performed through the opto-acoustic signals which are processed by the prefilter.

Description

technical field [0001] The invention belongs to the field of signal processing, and in particular relates to performing clutter filtering on photoacoustic signals by using Renyi entropy, thereby improving the signal-to-noise ratio and photoacoustic imaging quality of photoacoustic signals. Background technique [0002] In the process of photoacoustic image reconstruction, there are many factors that affect the imaging quality, and the two most important factors are the signal-to-noise ratio of the original photoacoustic signal and the image reconstruction algorithm. However, the current research on photoacoustic image reconstruction is more biased towards the continuous optimization and improvement of the algorithm, but ignores the influence of the quality of the photoacoustic signal itself. The photoacoustic signal is obtained from an ultrasound transducer, which is activated at the same time as the laser pulse is generated. Theoretically, the photoacoustic signal received...

Claims

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Application Information

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IPC IPC(8): G06T11/00G06T7/136G06T5/00G06K9/40G06K9/46
CPCG06T5/002G06T7/136G06T11/005G06T2207/20056G06T2211/416G06V10/30G06V10/443
Inventor 王一平王荣罗翠线李朋伟胡杰李刚桑胜波张文栋
Owner TAIYUAN UNIV OF TECH
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