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Breast tumor detection system

A detection system and breast tumor technology, applied in the medical field, can solve the problems of difficult resonance frequency and unsatisfactory recognition effect, and achieve the effect of improving tumor speed and accuracy and reducing the risk of tumor judgment

Active Publication Date: 2019-01-29
YITI INTELLIGENT TECH LTD SHENZHEN CITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is very difficult to accurately extract the resonant frequency in the electromagnetic wave, and it is unavoidable to be affected by factors such as measurement antennas, breast glands, skin reflections, equipment noise, etc., resulting in unsatisfactory recognition results

Method used

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  • Breast tumor detection system
  • Breast tumor detection system
  • Breast tumor detection system

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] This embodiment is used to illustrate the principle and steps of the present invention to solve technical problems. During the moving process of the breast scanning spiral moving device, the main control module controls a certain port of the vector network analyzer to transmit microwave signals, and the microwave signals are transmitted to the Microwave antenna (including transmitting antenna, receiving antenna) and radiates into the space of the detection container through the microwave antenna. The microwave signal passes through or touches the breast or the test body (breast phantom) and is reflected to other microwave antennas. Other microwave antennas The received echo scattering signal is transmitted to the other signal ports of the vector network analyzer through the cable signal line, and the vector network analyzer records the echo original electromagnetic wave signal to complete a single scan. The main control module controls the sending and receiving of differe...

Embodiment 2

[0022] This embodiment is used to explain preferred scheme:

[0023] First of all, the original electromagnetic wave signal received by the microwave antenna needs to be preprocessed, including filtering and calibration, and the preprocessed signal is defined as

[0024] the y i (t)=a(t)s i (t)+e i (t)(1), where y i (t)=[y i,1 (t),...,y i,M (t)] T is the preprocessed signal vector obtained from 1 to M receiving antennas excited by the i-th transmitting antenna, s i (t) is the scattering signal excited by the i-th transmitting antenna and at any scattering point in the breast imaging space, a(t) is the steering vector of the signal, e i (t) is the sum of all interference signals and noises outside the scattering point.

[0025] In microwave imaging, the y i (t) All signals in the vector are scaled to position r in the time domain 0 , so that the steering vector reaches and make the steering vector satisfy the condition: Among them, δ is the limit value describing ...

Embodiment 3

[0031] Although the adaptive beamforming method guarantees the minimum mean square error of the signal, it cannot guarantee the most approximate estimation of the signal waveform. Therefore, this embodiment provides a minimum variance objective function on the basis of Embodiment 2, which can analyze the waveform Estimate to overcome the error in the waveform of the signal to be recovered:

[0032] First, define a new minimum mean square error objective function:

[0033]

[0034] in is the real waveform to be restored, s(t) is the real waveform and its mean value is zero, and the minimization solution of formula (8) can be obtained: W=|s| 2 (R Y +|s| 2 aa H ) -1 a(9), in order to simplify this embodiment, the time function t is omitted, then the formula (9) can also be expressed as the adaptive beamforming RCB method multiplied by the coefficient β:

[0035] W β =βW RCB (10), where, s is the unknown real signal waveform, in order to get |s| 2 For an approximate...

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Abstract

The invention discloses a breast tumor detection system, which comprises an emission antenna, a receiving antenna and a processor, wherein the processor is used for executing the following steps of obtaining a tumor scattered signal on the basis of a self-adaption wave beam forming method according to a formula in the description: [S-double-bar](t)=[W<[beta-tilde]><T>[S-caret](t0)]<T>, wherein W<[beta-tilde]> is a first weighting coefficient; [S-caret](t0) is a time function of the initial wave form; the superscript T is a transposition symbol; extracting the multiple resonance frequency of the tumor scattered signal; and outputting a detection result on the basis of the index of the multiple resonance frequency. The tumor scattered signal is obtained on the basis of the self-adaption wavebeam forming method according to the formula in the description: [S-double-bar](t)=[W<[beta-tilde]><T>[S-caret](t0)]<T>; the multiple resonance frequency of the tumor scattered signal is extracted; the detection result is output on the basis of the index of the multiple resonance frequency; the tumor judging risk can be reduced; and the automatic tumor distinguishing speed and accuracy can be improved.

Description

technical field [0001] The invention relates to the field of medical technology, in particular to a breast tumor detection system. Background technique [0002] Breast cancer detection methods based on microwave imaging technology have been reported by a large number of studies and have shown good potential for clinical application. It can determine the location of tumors. For the judgment of malignant first diagnosis, due to the heterogeneity of the breast, especially the dense breast glands, it is difficult to judge the size and edge shape of the tumor by microwave images. In order to overcome this difficulty, the electromagnetic wave spectrum collected during the imaging process can be analyzed. The complex resonance frequency information implicit in the spectrum can identify the edge shape of the target and achieve the purpose of identifying the nature of the tumor. However, it is very difficult to accurately extract the resonant frequency in the electromagnetic wave, a...

Claims

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Application Information

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IPC IPC(8): A61B5/055
CPCA61B5/055A61B5/72
Inventor 杨帆张晓峰孙林
Owner YITI INTELLIGENT TECH LTD SHENZHEN CITY
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