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Ultrasonic tomography method

A tomography and ultrasound technology, applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, material analysis using sonic/ultrasonic/infrasonic waves, instruments, etc. Effects of Imaging Results

Active Publication Date: 2021-07-13
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the use of ultrasound to image hard tissue also has a good market and development prospects, but due to the large difference in acoustic impedance between soft tissue and hard tissue, it will cause serious attenuation and other problems in the process of ultrasonic transmission, making hard tissue Ultrasonic imaging of hard tissues is difficult, so the current ultrasonic tomographic imaging technology for hard tissues still needs research and development.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] figure 2 It is a schematic diagram of the signal transmitting and collecting system in Embodiment 1 of the present invention.

[0055] Such as figure 2 As shown, the sample to be tested passes through the center of the ring array transducer and placed together in the water tank.

[0056] figure 1 It is a schematic flow chart of ultrasonic tomography in Embodiment 1 of the present invention.

[0057] Such as figure 1 As shown, the present invention provides a method for ultrasonic tomography, which includes the following steps in this embodiment:

[0058] Step 1, fixing the ultrasonic ring array transducer in the water tank, placing the area to be imaged of the sample in the center of the ring array transducer, and injecting water into the water tank to immerse the sample and the ultrasonic ring array transducer;

[0059] In this embodiment, the transducer used for transmitting and receiving ultrasonic signals is a ring array ultrasonic transducer containing 128 u...

Embodiment 2

[0083] In this embodiment, the sample used is a nylon hollow tube, the sound velocity of the nylon material is 2680m / s, and the density is 1150kg / m 3 , The outer diameter of the hollow tube is 35mm, and the thickness of the nylon tube wall is 3mm. This sample was used as the sample to be imaged.

[0084] Following the same steps as in Example 1, using the same transducer and applying the same calculation method, the tomographic imaging results of the sample in Example 2 were obtained.

[0085] image 3 It is the sound velocity distribution figure obtained in Example 2 of the present invention.

[0086] Such as image 3 As shown, the average relative error of the sound velocity of the obtained model is 4.05%.

[0087] Figure 4 It is the tomographic imaging result of Example 2 of the present invention.

[0088] Such as Figure 4 As shown, the inner and outer boundaries of the nylon hollow tube are clearly visible, and the shape, relative position and wall thickness of th...

Embodiment 3

[0090] In this example, the sample used was a bovine femur. Figure 5 It is the μCT cross-sectional view of the sample used in Example 3 of the present invention. The bovine femur was purchased from the market, and after soft tissue removal, degreasing and moderate grinding, the middle section of the long bone was cut to prepare a sample. The model of the equipment used to obtain the μCT cross-sectional view is Bruker Skyscan-1176, and the space of the equipment is 35 μm.

[0091] Following the same steps as in Example 1, using the same transducer and applying the same calculation method, the tomographic imaging results of the sample in Example 3 were obtained.

[0092] Figure 6 It is the sound velocity distribution figure obtained in Example 3 of the present invention.

[0093] Such as Figure 6 As shown, the estimated sound velocity value of this embodiment is about 3500m / s, which is relatively close to the average longitudinal wave velocity 3400m / s perpendicular to the ...

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Abstract

The invention provides an ultrasonic tomography method, which is characterized by comprising the following steps of: 1, fixing a ring array ultrasonic transducer in a water tank, placing an area to be imaged in the center of the transducer, and injecting water into the water tank to immerse a sample and the transducer; 2, transmitting an ultrasonic pulse signal, and receiving an echo signal of an ultrasonic pulse; 3, using a first algorithm to extract the propagation time of the ultrasonic first arrival wave from the echo signal; 4, according to the propagation time of the ultrasonic first arrival wave, using a Bayesian estimation method to invert and reconstruct a sound velocity distribution model of the sample, and using a second algorithm to solve the sound velocity distribution model; 5, solving the eikonal equation of the sound velocity distribution model by using a third algorithm, and obtaining the ultrasonic propagation time that each array element of the ring array ultrasonic transducer reaches each point of the to-be-imaged area of the sample; and 6, calculating a delay matrix formed by the ultrasonic propagation time by using a fourth algorithm to obtain the ultrasonic tomography of the to-be-imaged area of the sample.

Description

technical field [0001] The invention belongs to the field of ultrasonic detection and imaging, and in particular relates to an ultrasonic tomographic imaging method. Background technique [0002] Ultrasonic detection and imaging technology has the advantages of low cost and no ionizing radiation. The use of ultrasound to detect and image human tissue has a good prospect. Ultrasonic tomographic imaging technology using circular array ultrasonic transducers has been researched and developed to a certain extent, and relatively accurate tomographic imaging of human breast and other soft tissues has been achieved. [0003] Although the use of ultrasound to image hard tissue also has a good market and development prospects, but due to the large difference in acoustic impedance between soft tissue and hard tissue, it will cause serious attenuation and other problems in the process of ultrasonic transmission, making hard tissue Ultrasonic imaging of hard tissues is relatively diffi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/06G01N29/07
CPCG01N29/0672G01N29/07
Inventor 他得安李义方石勤振史凌伟
Owner FUDAN UNIV