Real-time ultrasonic phased array total focusing imaging method

A technology of ultrasonic phased array and imaging method, which is applied in the direction of processing detection response signals, etc., can solve the problems of long calculation time, large amount of calculation, and high calculation complexity, and achieve high cost, good resolution, and high imaging accuracy. Effect

Inactive Publication Date: 2017-04-26
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the disadvantage of all-focus imaging technology is that it has a large amount of data and a large amount of calculation.
Taking a 16-element phased array probe as an example, when the sampling depth of each A-scan is 3000, the data file captured by a full matrix is ​​1MB; It involves multiplication and square root operations, and the calculation complexity is higher than that of traditional ultrasonic phased array B-scan imaging
Therefore, the current application of all-focus imaging technology is focused on phased array post-processing imaging, that is, collecting data first, and then performing imaging processing on the data. The calculation time is long, and online measurement and real-time imaging cannot be realized.

Method used

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Embodiment 1

[0029] A real-time ultrasonic phased array total focus imaging method, see figure 1 , the imaging method includes the following steps:

[0030] 101: Using an ultrasonic phased array probe to collect ultrasonic data of the target area in a full-matrix capture manner;

[0031] 102: Grid the range of the area to be measured, start from the first point in the upper left corner of the grid, obtain the sound path and corresponding position information of the sound waves emitted by each array element back to each array element, and obtain the index matrix;

[0032] 103: Create a copy of the GPU kernel function, and realize real-time full-focus imaging according to the index matrix.

[0033] Wherein, the step of obtaining the index matrix in the above step 102 is specifically:

[0034] Grid the range of the area to be measured; take the center of the phased array probe as the origin, the direction of the array element is the x-axis, and the depth direction is the y-axis to establis...

Embodiment 2

[0043] The scheme in embodiment 1 is further introduced below in conjunction with specific drawings and calculation formulas, see the following description for details:

[0044] 201: Use the ultrasonic phased array probe to collect the ultrasonic data of the target area in the way of full matrix capture, and transmit it to the host computer;

[0045] see figure 2 , the data acquisition process of the full matrix capture is as follows:

[0046] 1. Excite the first array element, and then all array elements receive ultrasonic echoes;

[0047] 2. Excite the second array element, and then all array elements receive ultrasonic echoes;

[0048] 3. By analogy, all array elements are excited-after receiving, taking the 16-element ultrasonic phased array probe as an example, a 16×16 data matrix can be obtained.

[0049] Among them, the embodiment of the present invention does not limit the probe model of the ultrasonic phased array, and only needs to know the center frequency of th...

Embodiment 3

[0075] Combine below Figure 4 and Figure 5 The scheme in embodiment 1 and 2 is carried out feasibility verification, see the following description for details:

[0076] The device parameters used in the embodiment of the present invention are: a 16-element ultrasonic phased array probe with a center frequency of 3.5 MHz, an array element center distance of 1.6 mm, an AD sampling frequency of 100 MHz, and a sampling point depth of 3284 points. The gridded area range is 48mm long and 45mm deep, discretized into a 200×200 grid. The upper computer CPU is Intel core i5 2410M, 4GB memory, NVDIA GT540M graphics card with 1GB video memory, and the operating system is Windows 7 64bit. The block to be tested is Figure 4 As shown, the material of the test block is aluminum with a thickness of 30mm. There are three artificial holes drilled on the test piece with a diameter of 1mm. The distance between the upper left hole and the upper surface of the test piece is 10mm. The distance i...

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Abstract

The invention discloses a real-time ultrasonic phased array total focusing imaging method. The imaging method comprises the following steps: acquiring ultrasonic data of a target area in a full matrix capture manner by using an ultrasonic phased array probe; gridding an area range to be detected, acquiring a sonic path distance of sound waves emitted by every array element, returning to every array element, from the first point in the top left corner of grids and corresponding position information, and acquiring an index matrix; and establishing a GPU kernel function copy, and realizing real-time total focusing imaging according to the index matrix. The method realizes real-time highly precise ultrasonic imaging and improves the resolution of images.

Description

technical field [0001] The invention relates to the field of ultrasonic phased array imaging, in particular to a real-time ultrasonic phased array all-focus imaging method. Background technique [0002] Ultrasonic phased array testing technology is currently a commonly used non-destructive testing technology in the industrial field, and Total Focus Method is a new imaging method proposed in recent years. The full focus imaging technology is based on full matrix data capture (Full Matrix Capture). On the basis of the full matrix capture to obtain all channel information, it can achieve focused imaging of all points in the target area. The traditional ultrasonic phased array technology relies on changing the excitation time of the ultrasonic phased array elements to achieve the focusing and deflection of the sound beam, and can only achieve single-point focusing; realizing high-precision delay (nanosecond) control requires complex circuit, the price is high. The full-focus i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/44
CPCG01N29/44
Inventor 贾乐成陈世利白志亮张昊曾周末
Owner TIANJIN UNIV
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