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Orthogonal weak correlation bipolar encoding excitation method based on bi-level correlation function

A correlation function method and coding excitation technology, which is applied in the coding excitation field of transmission ultrasonic tomography, can solve the problems of reducing measurement time, ultrasonic parameter error, and affecting parameter extraction accuracy, so as to reduce the impact and reduce the measurement time Effect

Inactive Publication Date: 2012-11-07
HARBIN HANGKONG BOCHUANG SCI & TECH
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Problems solved by technology

[0005] The purpose of the present invention is to propose an orthogonal weakly correlated bipolar coding excitation method based on the double-layer correlation function method, which solves the problem of the ultrasonic parameter error introduced by the mutual influence of the ultrasonic signals sent by each array element, thereby Reduce measurement time while compromising parameter extraction accuracy

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  • Orthogonal weak correlation bipolar encoding excitation method based on bi-level correlation function
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  • Orthogonal weak correlation bipolar encoding excitation method based on bi-level correlation function

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specific Embodiment approach 1

[0021] Specific implementation mode 1: The orthogonal weak correlation bipolar coding excitation method based on the double-layer correlation function method in this embodiment is realized through the following technical solutions: firstly, the orthogonal weak correlation bipolar coding is used for transmission ultrasonic tomography The ultrasonic transmission process is modulated, and the parameters are extracted by using the double-layer correlation function method after receiving the ultrasonic signal.

[0022] Such as figure 1 As shown, the specific steps are as follows:

[0023] Step 1: Generate an orthogonal weakly correlated bipolar code set. The specific description of the orthogonal weakly correlated bipolar code set is as follows.

[0024] length is A collection of sequences consisting of

[0025] (1);

[0026] Define the cross-correlation of two series as

[0027] (2);

[0028] It is called an orthogonal code set if the following conditions are...

specific Embodiment approach 2

[0057] Specific Embodiment 2: This embodiment takes the data acquisition of transmission ultrasonic tomography using a ring array as an example to further explain the orthogonal weak correlation bipolar encoding excitation method based on the double-layer correlation function method of the present invention. Can be used in any transmission tomography.

[0058] Assume that the signal emitted by the ultrasonic array element can be approximated as a Gaussian envelope signal:

[0059] (10);

[0060] in is the amplitude of the transmitted waveform, is the emission time, is the attenuation factor, is the center frequency of the probe. exist When , due to the exponential decay, the signal is very small and can be approximated to 0. In this paper, . parameter , , and It is determined by the characteristics of the transmitting circuit and the transducer. Since the atomic waveform only needs to meet the condition of tight support, the parameter v...

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Abstract

An orthogonal weak correlation bipolar encoding excitation method based on bi-level correlation function relates to an encoding excitation method of transmission-type ultrasound tomography. In order to solve the problem that ultrasound parameter errors are caused by interaction of ultrasound signals sent by array elements, the encoding excitation method includes following steps: an orthogonal weak correlation bipolar encoding set needed by encoding excitation is generated according to required array element amount launched simultaneously. The generated encoding set is used to modulate launching process of tomography and acquires waveform signals penetrating through detected objects. Transit time and amplitude are extracted from the received waveform signals by using the bi-level correlation function. Compared with existing methods without using the encoding excitation method, measurement time can be greatly reduced. Compared with conventional encoding excitation methods based on matched filtering, influence among array element transmitted waveforms can be reduced maximally, and precision of parameter extraction is not affected by encoding excitation process.

Description

technical field [0001] The invention relates to a coding excitation method for transmission ultrasonic tomography, in particular to a method for modulating the ultrasonic signal transmission process and extracting transit time and ultrasonic amplitude from the received signal. Background technique [0002] There are differences in acoustic parameters such as sound velocity and sound absorption coefficient between cancerous breast tumor tissue and normal breast tissue. Breast cancer diagnosis research based on acoustic parameters has always been an important research direction of ultrasound medicine. The density, sound velocity and sound attenuation coefficient of cancerous tissue are higher than those of normal tissue. In addition, women with higher breast density are more likely to suffer from breast cancer, and breast tissue density and sound velocity have a strong correlation, so it can Transmission ultrasonic tomography, which measures the sound velocity and attenuation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B8/15
CPCG01S15/8959
Inventor 沈毅王艳金晶沈祥立
Owner HARBIN HANGKONG BOCHUANG SCI & TECH
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