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Focused acoustic array imaging method and system

An imaging method and imaging system technology, applied in radio wave measurement systems, acoustic wave diagnosis, scientific instruments, etc., can solve the problems of large calculation time, large amount of calculation, and large storage space, so as to improve imaging results and improve detection Performance, the effect of improving real-time processing speed

Active Publication Date: 2021-07-13
INST OF ACOUSTICS CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

[0004] At present, the disadvantage of the full-focus acoustic array imaging technology is that it has a huge amount of data and requires a large amount of storage space; at the same time, using full-matrix data to perform focused imaging on all focal points requires a huge amount of calculation and takes a long time to calculate.
Taking a 16-element phased array probe as an example, when the sampling depth of each A-scan echo signal is 2000, a complete full-matrix data has 2MB. When performing all-focus imaging calculations, for each focus All points involve operations such as multiplication, square root, and addition, and the calculation complexity is much higher than that of traditional phased array B-scan imaging; at the same time, the all-focus imaging method only excites one array element at a time, and the emission energy is weak, resulting in The signal-to-noise ratio of the imaging system is low

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  • Focused acoustic array imaging method and system

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Embodiment 1

[0043] Such as figure 2 As shown, Embodiment 1 of the present invention proposes a focused acoustic array imaging method, comprising the following steps:

[0044] Step 1) using an acoustic array of M array elements, adopting a single array element to launch all array elements to collect all the echo data in the imaging area, which is recorded as full matrix data;

[0045] The values ​​of the mth row and the nth column of the full matrix data are as follows: the mth array element is the transmitting array element, and the nth array element is all the echo data of the imaging area of ​​the receiving array element.

[0046] Step 2) The imaging area is gridded according to a predetermined resolution, and the imaging area is obtained according to the propagation path calculated by the geometric relationship between each receiving array element and the transmitting array element when it is directly incident or the set relationship when passing through the medium refraction Each pixel...

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Abstract

The invention discloses a focused acoustic array imaging method and system, and the method comprises the steps: obtaining echo data of an imaging region through employing a single-array-element transmission and all-array collection mode, transmitting and traversing all array elements, and obtaining all echo data as full-matrix data; calculating a delay index table of the whole imaging area; taking a main diagonal line of the full matrix data as a reference, and calculating to obtain a reference image according to the delay index table; calculating a focused image by using secondary diagonal data of the full-matrix data according to the delay index table and echo data corresponding to the secondary diagonal, and superposing the focused image with the reference image; and continuing to gradually move towards the two sides until the superposed focused image meets the image quality requirement. According to the focused acoustic array imaging method and system, the focusing imaging real-time processing speed is increased, the target image with the better signal-to-noise ratio can be obtained according to needs, the acoustic array imaging result is greatly improved, and the acoustic array detection performance is improved.

Description

technical field [0001] The invention relates to acoustic array imaging technology, in particular to a focused acoustic array imaging method and system. Background technique [0002] Acoustic array imaging is of great significance to industries such as industrial non-destructive testing, medicine and underwater testing, and has been widely used in recent years. For the consistency and brevity of the description, all the following descriptions will be made by taking the ultrasonic array detection in the industrial detection as an example. [0003] Ultrasonic array testing technology is based on ultrasonic array transducers, using ultrasonic longitudinal waves or transverse waves (as shown in Figure 1(a) and Figure 1(b)), a method for non-destructive testing of industrial parts. Ultrasonic array detection technology can also be used to detect complex materials such as composite materials. This method has great flexibility and can detect parts with irregular shapes. Compared w...

Claims

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Application Information

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IPC IPC(8): G01N29/06G01N29/26G01S15/89A61B8/00
CPCG01N29/0654G01N29/262G01S15/89A61B8/4411A61B8/4488
Inventor 周二磊吴文焘曾邱毓晨曹政
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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