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CN-116990823-B - Ultrasonic imaging method for weighting intensity coefficient of probe center frequency

CN116990823BCN 116990823 BCN116990823 BCN 116990823BCN-116990823-B

Abstract

The invention discloses an ultrasonic imaging method for weighting intensity coefficients of probe center frequencies, which comprises the steps of firstly collecting echo signals received by an ultrasonic probe, determining echo signal positions corresponding to pixel points and intensities of the echo signals according to coordinate information of the pixel points, then taking a section of signals before and after the echo positions to form short-time echo signals, carrying out Fourier transformation on the short-time echo signals to obtain a frequency spectrum, selecting a frequency spectrum intensity value corresponding to the probe center frequencies, and multiplying the frequency spectrum intensity value with the echo signal intensity value of the pixel points to obtain a high-quality imaging result. The invention can restrain stronger noise without losing other information.

Inventors

  • ZHENG CHICHAO
  • TANG YI

Assignees

  • 合肥工业大学

Dates

Publication Date
20260505
Application Date
20230802

Claims (7)

  1. 1. An ultrasonic imaging method for weighting intensity coefficients of a probe center frequency is characterized by comprising the following steps: The method comprises the steps that firstly, ultrasonic equipment excites a single-array element ultrasonic probe by adopting high-voltage pulse waves, and transmits ultrasonic waves to an imaging area to acquire echo signals of the imaging area; Step two, according to the coordinate information of the pixel points in the imaging area and the position information of the probe, determining the corresponding position p and the signal intensity s (p) of any pixel point on the central line of the ultrasonic beam emitted by the probe in the imaging area in the echo signal; Setting the length of a short-time signal, acquiring a section of signal containing a position p from an echo signal according to the length, taking the section of signal as the short-time echo signal, carrying out Fourier transformation on the short-time echo signal, and obtaining a frequency spectrum S (p, f) of the short-time signal, wherein f represents frequency; Setting a frequency bandwidth parameter, and setting a calculation range f n of the frequency spectrum according to the central frequency f m of the ultrasonic probe, so that the central frequency intensity coefficient of the probe is calculated by using the frequency bandwidth parameter in the calculation range f n ; step five, multiplying the probe center frequency intensity coefficient with the signal intensity s (p) to obtain an imaging result of the pixel points, thereby obtaining imaging results of all the pixel points on a center line; Step six, changing the position of the probe, repeating the step one to the step five to obtain imaging results of all pixel points on the central line of ultrasonic beams emitted by the probe at different probe positions and taking the imaging results as imaging results of an imaging area, normalizing the imaging results of the imaging area, and then carrying out graying treatment to obtain high-quality ultrasonic images.
  2. 2. The ultrasonic imaging method of claim 1, wherein the probe center frequency intensity coefficient MF T in the fourth step is obtained by using formula (1): In the formula (1), α is an intensity adjustment coefficient.
  3. 3. The probe center frequency intensity coefficient weighted ultrasonic imaging method according to claim 1, wherein the length of the short-time signal in the third step is not less than the wavelength λ of the ultrasonic signal emitted by the probe, and λ is obtained by the formula (2): in the formula (2), c is the sound velocity of the imaging region.
  4. 4. The ultrasonic imaging method of weighting the intensity coefficient of the probe center frequency according to claim 2, wherein the intensity adjustment coefficient α has a value ranging from 0.1 to 10.
  5. 5. The ultrasonic imaging method of claim 2, wherein the calculated range f n of the frequency spectrum is not greater than the center frequency f m of the ultrasonic probe.
  6. 6. An electronic device comprising a memory and a processor, wherein the memory is configured to store a program that supports the processor to perform the ultrasound imaging method of any of claims 1-5, the processor being configured to execute the program stored in the memory.
  7. 7. A computer readable storage medium having stored thereon a computer program, characterized in that the computer program when executed by a processor performs the steps of the method of ultrasound imaging according to any of claims 1-5.

Description

Ultrasonic imaging method for weighting intensity coefficient of probe center frequency Technical Field The invention is suitable for the field of ultrasonic imaging, in particular to an ultrasonic imaging method for weighting intensity coefficients of probe center frequency. Background Ultrasound imaging devices are widely used. In the existing ultrasonic imaging equipment, two types of ultrasonic imaging equipment can be divided according to different probes, one type of ultrasonic imaging equipment adopts a multi-array element to form an array probe for imaging, and the other type of ultrasonic imaging equipment adopts a single-array element probe for imaging. The imaging of the array probe is to form an imaging vector by echo signals received by each array element according to the position of the pixel point, and then to perform imaging by adopting a delay superposition technology. The self-adaptive weighting method can improve imaging quality, and the existing self-adaptive weighting coefficients are all calculated according to imaging vectors of the array probe and are not suitable for the imaging method based on the single-array element probe. Compared with the imaging method based on the array probe, the imaging method based on the single array probe has the advantages of low complexity, simple system structure, low cost, easiness in implementation and the like, but has the defects of large gap, such as low contrast, poor signal to noise ratio and the like, so that the imaging quality of single array imaging equipment is in need of improvement. Disclosure of Invention The invention provides an ultrasonic imaging method based on probe center frequency intensity coefficient weighting, which is suitable for an imaging system based on a single-array-element ultrasonic probe and can effectively inhibit noise so as to improve imaging contrast and imaging quality of the single-array-element ultrasonic imaging system. In order to achieve the aim of the invention, the invention adopts the following technical scheme: the invention relates to an ultrasonic imaging method weighted by the intensity coefficient of the center frequency of a probe, which is characterized by comprising the following steps: The method comprises the steps that firstly, ultrasonic equipment excites a single-array element ultrasonic probe by adopting high-voltage pulse waves, and transmits ultrasonic waves to an imaging area to acquire echo signals of the imaging area; Step two, according to the coordinate information of the pixel points in the imaging area and the position information of the probe, determining the corresponding position p and the signal intensity s (p) of any pixel point on the central line of the ultrasonic beam emitted by the probe in the imaging area in the echo signal; Setting the length of a short-time signal, acquiring a section of signal containing a position p from an echo signal according to the length, taking the section of signal as the short-time echo signal, carrying out Fourier transformation on the short-time echo signal, and obtaining a frequency spectrum S (p, f) of the short-time signal, wherein f represents frequency; Setting a frequency bandwidth parameter, and setting a calculation range f n of the frequency spectrum according to the central frequency f m of the ultrasonic probe, so that the central frequency intensity coefficient of the probe is calculated by using the frequency bandwidth parameter in the calculation range f n; step five, multiplying the probe center frequency intensity coefficient with the signal intensity s (p) to obtain an imaging result of the pixel points, thereby obtaining imaging results of all the pixel points on a center line; Step six, changing the position of the probe, repeating the step one to the step five to obtain imaging results of all pixel points on the central line of ultrasonic beams emitted by the probe at different probe positions and taking the imaging results as imaging results of an imaging area, normalizing the imaging results of the imaging area, and then carrying out graying treatment to obtain high-quality ultrasonic images. The ultrasonic imaging method with weighted probe center frequency intensity coefficient is characterized in that the probe center frequency intensity coefficient MF T in the fourth step is obtained by using the formula (1): In the formula (1), α is an intensity adjustment coefficient. The length of the short-time signal in the third step is not less than the wavelength lambda of the ultrasonic signal emitted by the probe, and lambda is obtained by the formula (2): in the formula (2), c is the sound velocity of the imaging region. The value of the intensity adjustment coefficient alpha ranges from 0.1 to 10. The calculated range f n of the frequency spectrum is not greater than the center frequency f m of the ultrasound probe. The electronic device of the invention comprises a memory and a processor, wherein the memory is used for