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Self-adaption apodization method based on phase coherent information

A technology of phase coherence and phase information, applied in the field of signal analysis, can solve the problems of off-axis signal interference, complex calculation, weighted value not associated with received data, etc., achieve low horizontal resolution, simple calculation process, and improve horizontal resolution rate effect

Active Publication Date: 2015-07-15
CHISON MEDICAL TECH CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide an adaptive apodization method based on phase coherence information, which overcomes the problems of interference from off-axis signals, complex calculations, and weighted values ​​not associated with received data in the traditional ultrasonic imaging signal processing process

Method used

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  • Self-adaption apodization method based on phase coherent information
  • Self-adaption apodization method based on phase coherent information
  • Self-adaption apodization method based on phase coherent information

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Embodiment 1

[0031] Such as figure 1 As shown, an adaptive apodization method based on phase coherence information, the specific steps are as follows:

[0032] Step 1: Perform classic analog-to-digital conversion (A / D) on the signals obtained from each channel.

[0033] Step 2: Perform initial delay and dynamic focus processing on the signal obtained through step 1 to obtain the processed signal Ι_i, 1≤i≤N, where N is the number of channels; at the same time, delay each signal by several clock beats , waiting for the acquisition of the adaptive apodization coefficient.

[0034] Step 3: Hilbert transform the signal I_i of each channel, and obtain the corresponding phase information Phase_i of each channel through the CORDIC algorithm.

[0035] Step 4: Average the channel phase information obtained in step 3 As the scanning depth increases, the receiving aperture increases gradually, and N increases gradually.

[0036] Step 5: On the basis of step 4, obtain the absolute difference Phase...

Embodiment 2

[0043] Such as figure 2 , 3 , as shown in 4: where image 3 for figure 2 The sub-module of shows a schematic diagram of multi-frequency sub-band decomposition and adaptive apodization coefficient calculation module; Figure 4 for figure 2 The sub-module of , showing the schematic diagram of the adaptive apodization coefficient calculation module. The specific implementation steps are as follows:

[0044] Step 1: Perform classic analog-to-digital conversion on the signals obtained from each channel.

[0045] Step 2: If figure 2 As shown, the initial delay and dynamic focus processing are performed on the signal obtained through step 1 processing, and each channel signal Ι_i after processing is obtained, 1≤i≤N, where N is the number of channels; as image 3 As shown, the multi-frequency sub-band decomposition is performed on each channel signal to obtain the sub-band signal I_i_I_j of each channel signal, 1≤j≤M, where M is the number of signal decomposition frequencies,...

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Abstract

The invention provides a self-adaption apodization method based on phase coherent information. The method includes the steps of conducting Hilbert change on all routes of channel signals to obtain the phase information, obtaining a dynamic weighting value of each channel through a certain self-adaption processing method according to preliminary phase estimation and the deviation of the phase information of each channel, and conducting beam forming at last. To improve the robustness of the self-adaption processing method, a phase variance sensitive threshold and multiple geometrical mapping relation curves between a phase difference and the weighting values are introduced into the calculation process of the dynamic weighting values. According to the self-adaption apodization method, by means of internal phase diversities, received in the beam forming process, of data of the multiple channels, side lobe signals and grating lobe signals are restrained, meanwhile, the width of a main beam is reduced, and transverse resolving ability of images is improved.

Description

technical field [0001] The invention relates to a signal analysis method, in particular to an adaptive apodization method for medical ultrasound signals based on phase coherence information. Background technique [0002] Ultrasound imaging has the advantages of low cost and high safety factor, and is regarded as an effective diagnostic method in the medical field. Ultrasound imaging usually adopts the beamforming method of transmitting pulse waves to receive echo signals, and then performing classic analog-to-digital conversion, initial delay, dynamic focusing and other steps on the received echo signals for imaging. [0003] The early traditional beamforming method is to delay and dynamically focus the signals received by each probe element to make up for the difference in the acoustic propagation distance between the focus point and the array elements, and sum them to obtain the signal energy of the focus point. In an ideal focusing environment, the phases of the echo dat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B8/00
Inventor 严凯张勇莫善珏
Owner CHISON MEDICAL TECH CO LTD
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