CN205758511U - A kind of Microwave Scanning breast imaging device - Google Patents

Abstract

This utility model relates to a kind of Microwave Scanning breast imaging device, including microwave signal generating unit, microwave signal antenna element, microwave imaging unit, described microwave signal generating unit generation microwave signal, multiple described microwave signal antenna elements scan around breast area to be measured in the form of a ring, multiple described microwave signal antenna elements send and receive microwave signal, and described microwave imaging unit carries out microwave imaging according to the microwave signal received to breast.

Description

A kind of Microwave Scanning breast imaging device

Technical field

This utility model relates to a kind of microwave imagery scanning means, particularly relates to a kind of scanning means for breast imaging image.

Background technology

During medical treatment detects, generally include X-ray and take the photograph sheet, color ultrasound, magnetic resonance and histology.It is high that X-ray takes the photograph chip resolution, but along with ionizing radiation and the compression to breast, is not suitable for the generaI investigation of patient.Color ultrasound detects "dead" infringement, but can not show part cancer sufferer, calcification point and burr poplar structure, and big by inspecting doctor's experience influence.Costly, imaging time is long, and histological examination also needs to be accurately positioned in magnetic resonance, as molybdenum target be inducted into pin, color ultrasound guidance enters pin etc..Therefore, these current detection meanss are not particularly suited for large-scale cancer sufferer examination, in particular for the rural area that China is vast, medical facilities and universal the most unbalanced under the conditions of, and the Clinical detection of microwave imaging have, effect low without ionizing radiation, cost and X-ray quite, can long term monitoring feature, it is possible to become me and cross the important tool of extensive examination.

In microwave Imaging Technique, the scanning technique of microwave antenna has important function, especially for breast imaging, is for subregion, has again definite shape simultaneously, and shape and the scan mode of microwave antenna have important function to breast imaging.Prior art does not have the Microwave Scanning apparatus and method being specifically designed for breast, and imaging effect is by extreme influence.

Utility model content

This utility model solves the technical problem that and is: build a kind of multi-modal microwave breast imaging device, overcomes prior art not have the Microwave Scanning apparatus and method being specifically designed for breast, and imaging effect is by the technical problem of extreme influence.

The technical solution of the utility model is: provide a kind of Microwave Scanning breast imaging device, including microwave signal generating unit, microwave signal antenna element, microwave imaging unit, described microwave signal generating unit generation microwave signal, multiple described microwave signal antenna elements scan around breast area to be measured in the form of a ring, multiple described microwave signal antenna elements send and receive microwave signal, and described microwave imaging unit carries out microwave imaging according to the microwave signal received to breast.

Further technical scheme of the present utility model is: described microwave imaging unit includes radar imagery unit, described microwave signal generating unit generation microwave broadband pulse signal, described microwave signal antenna element sends microwave broadband pulse signal to breast area to be measured, described microwave signal antenna element receives microwave broadband pulse echo signal, and described radar imagery unit generates radar detection image according to microwave broadband pulse echo signal.

Further technical scheme of the present utility model is: described microwave imaging unit includes Tomography unit, described microwave signal generating unit generation microwave single-frequency coherent signal, described microwave signal antenna element sends microwave single-frequency coherent signal to breast area to be measured, described microwave signal antenna element receives microwave single-frequency echo-signal, and described Tomography unit is according to microwave single-frequency echo signal form tomoscan image.

Further technical scheme of the present utility model is: also include merging output unit, radar imagery unit, Tomography unit, described microwave signal generating unit generation microwave broadband pulse signal and microwave single-frequency coherent signal, described microwave signal antenna element sends microwave broadband pulse signal and microwave single-frequency coherent signal to breast area to be measured, described microwave signal antenna element receives microwave broadband pulse echo signal and microwave single-frequency echo-signal, described radar imagery unit generates radar detection image according to microwave broadband pulse echo signal, described Tomography unit is according to microwave single-frequency echo signal form tomoscan image, described radar detection image and described tomoscan image are carried out merging output by described fusion output unit.

Further technical scheme of the present utility model is: multiple described microwave signal antenna elements form multiple rings, multiple around breast area to be measured.

Further technical scheme of the present utility model is: described microwave signal antenna element includes microwave transmitting antenna and microwave antenna, described microwave transmitting antenna and described microwave antenna are same microwave antenna, described microwave transmitting antenna and described microwave antenna alternation.

Further technical scheme of the present utility model is: described microwave signal generating unit is multiple, and microwave broadband pulse signal and microwave single-frequency coherent signal occur respectively.

Further technical scheme of the present utility model is: described microwave signal generating unit is one, and microwave broadband pulse signal and microwave single-frequency coherent signal alternately occur.

Of the present utility model having the technical effect that builds a kind of multi-modal microwave breast imaging device, in microwave Imaging Technique, the scanning technique of microwave antenna has important function, especially for breast imaging, it is for subregion, having again definite shape, shape and the scan mode of microwave antenna have important function to breast imaging simultaneously.This utility model microwave signal antenna element is in a spiral manner around breast area motion scan to be measured, and send the most successively and receive microwave signal, being scanned based on udder shape by microwave signal antenna element, microwave signal can be made more preferable, imaging is finer accurately.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model.

Fig. 2 is structure chart of the present utility model

Detailed description of the invention

Below in conjunction with specific embodiment, technical solutions of the utility model are further illustrated.

As shown in Figure 1 and Figure 2, detailed description of the invention of the present utility model is: this utility model builds a kind of multi-modal microwave breast imaging system, including microwave signal generating unit 1, microwave signal antenna element 2, microwave imaging unit 7, there is microwave signal in described microwave signal generating unit 1, multiple described microwave signal antenna elements 2 scan around breast area to be measured in the form of a ring, multiple described microwave signal antenna elements 2 send and receive microwave signal, and described microwave imaging unit 7 carries out microwave imaging according to the microwave signal received to breast.

Such as Fig. 1, shown in Fig. 2, specific implementation process of the present utility model is as follows: described microwave signal generating unit 1 occurs microwave signal, multiple described microwave signal antenna elements 2 scan around breast area to be measured in the form of a ring, multiple described microwave signal antenna elements 2 send and receive microwave signal, scanned around breast area to be measured in the form of a ring by multiple microwave signal antenna elements 2, multiple microwave signal antenna elements 2 send and receive microwave signal, microwave signal antenna element 2 receives the microwave echoes signal of whole breast, microwave imaging unit 7 carries out microwave imaging according to the microwave echoes signal received to breast.

Preferred implementation of the present utility model is: also include merging output unit 5, microwave broadband pulse signal and microwave single-frequency coherent signal is there is in described microwave signal generating unit 1 to region to be measured, described microwave signal antenna element 2 receives microwave broadband pulse echo signal and microwave single-frequency echo-signal, described radar imagery unit 3 generates radar detection image according to microwave broadband pulse echo signal, described Tomography unit 4 is according to microwave single-frequency echo signal form tomoscan image, described radar detection image and described tomoscan image are merged output by described fusion output unit 5.

Specific implementation process is as follows: described microwave signal generating unit 1 occurs microwave broadband pulse signal and microwave single-frequency coherent signal to region to be measured, and described microwave signal antenna element 2 receives microwave broadband pulse echo signal and microwave single-frequency echo-signal.Described microwave signal generating unit 1 includes that microwave generator and microwave transmitting antenna, described microwave signal antenna element 2 include that microwave antenna, microwave antenna include microwave transmitting antenna and microwave antenna.Microwave broadband pulse signal is there is to region to be measured in microwave signal generating unit 1 by microwave antenna, microwave broadband pulse signal irradiates the focal area in imaging region, produce scattering on surface, focal area, receive the signal from focus surface scattering with the scanning of several microwave antennas.There is microwave single-frequency coherent signal by microwave antenna to region to be measured in microwave signal generating unit 1, microwave antenna scans the microwave broadband pulse echo signal receiving and recording position.Microwave transmitting antenna and microwave antenna can be same microwave antenna, are used alternatingly；Microwave transmitting antenna and microwave antenna can also be respectively different microwave antenna, carry out respectively launching microwave signal and receiving microwave echoes signal using.Microwave signal generating unit is multiple, and microwave broadband pulse signal and microwave single-frequency coherent signal occur respectively；Or microwave signal generating unit is one, alternately there is microwave broadband pulse signal and microwave single-frequency coherent signal.Microwave radar image-forming principle utilizes theory of SAR, using a miniature antenna as single radiating element, the continuous motion scan in direction along a straight line, select some positions to launch signal in movement, receiving the corresponding echo-signal launching position, storage receives amplitude and the phase place of signal.Received the time of microwave broadband pulse echo signal by microwave antenna record, can calculate time delay, and the distance of microwave transmitting antenna and focus is fixed, therefore available micro-transmitting antenna is to the distance of focus, thus carry out accurate imaging.Microwave wave circuits and systems method is similar to computed tomography (CT), it it is a kind of THE INVERSE ELECTROMAGNETIC SCATTERING method, by scattering object external observation to electromagnetic field carry out the electromagnetic signature parameter distribution in inversion imaging region, thus judge the information such as the position of scattering object target, shape and size distribution.The microwave single-frequency echo-signal that will receive, according to electromagnetic signature parameter distribution and the position of scattering object target, shape and size distributed intelligence generation tomoscan image.The pixel of piece image in described radar detection image and described tomoscan image is mapped in another piece image by described fusion output unit 5, makes the fusion reaching unanimously to complete this two width image related like vegetarian refreshments on locus of two width images.

Image co-registration includes multiple method: a kind of method is labelling method, described radar detection image and described tomoscan image are marked at the characteristic point of image, the image tagged of described radar detection image and described tomoscan image are overlapped described radar detection image and described tomoscan image are merged.The image tagged of described radar detection image and described tomoscan image is identified, then identification image is carried out image co-registration as boundary mark.In specific embodiment, after being marked, image is optimized.Image tagged software design becomes the boundary mark synthesized by the Feature point recognition of image as image.Image tagged software is labelling, the labelling of lymph node identification and the labelling of characteristic to tissue identification according to described radar detection image and tomoscan image, coordinate axes is formed coincidence point, completing described radar detection image and the fusion of tomoscan image, the method is equally applicable to two dimension or the three-dimensional breast image that other modes combine.Further comprises the display to multi-modal microwave breast image, the two and three dimensions information of display breast, the labelling to focal area.Another kind of method is pixel weighted mean method, it may be assumed that the image pixel weighted average of described radar detection image and described tomoscan image correspondence position is completed image co-registration.

Below as a example by labelling method:

Image registration

By using coupling, superposition etc. to process means, the same target in multiple image is kept same position in the picture so that it is there is the process of identical space coordinates.

In the registration of microwave tomoscan image and microwave radar image, using metastable microwave tomoscan image as reference picture I, using microwave radar image as floating image II, carry out the image registration of maximum mutual information method based on pixel:

Rigid body translation includes transformation of scale, in two-dimensional image I I, and point (x₁, y₁) through rigid transformation to point (x₂, y₂) application formula be:

$\left[\begin{array}{c}{x}_2\\ y_2\end{array}\right]=K\left[\begin{array}{cc}cos\mathrm{\α}& \±sin\mathrm{\α}\\ sin\mathrm{\α}& \±cos\mathrm{\α}\end{array}\right]\left[\begin{array}{c}{x}_1\\ y_1\end{array}\right]---\left(1\right)$

Wherein, α is the anglec of rotation, and K is scale parameter.

Mutual information relevance evaluation.The gray value of two images subject to registration is regarded as two stochastic variable A and B, scope 0 to 255, and marginal probability distribution is P_A(a) and P_BB (), joint probability distribution is P_AB(a, b), then edge entropy and the combination entropy that can obtain A with B be: H (A), H (B) and H (A, B).Then have:

$\left\{\begin{array}{c}H\left(A\right)=-\underset{a}{\Σ}{P}_A\left(a\right)\log P_A\left(a\right)\\ H\left(B\right)=-\underset{b}{\Σ}{P}_B\left(b\right)\log P_B\left(b\right)\\ H(A,B)=-\underset{a}{\Σ}\underset{b}{\Σ}{P}_{AB}(a,b)\log P_{AB}(a,b)\end{array}\right.,a,b\∈\[0,255\]---\left(2\right)$

Normalized mutual information dependent evaluation function I (A, B) of stochastic variable A and B, for:

$I(A,B)=\frac{H\left(A\right)+H\left(B\right)}{H(A,B)}---\left(3\right)$

When two width images based on common anatomical structure reach optimal registration, gray scale cross-correlation value of information I (A, B) of they respective pixel should reach maximum.

Registration optimizes.After rigid body translation completes, described image optimization module 53 is optimized, that is: a kind of similarity side degree is found to weigh the similarity degree of two width images, need continuous transformation parameter α and K, similar side degree is made to reach optimum, wherein scale parameter K excursion is 0 to 1, and rotation angle range is 0 to 180 degree.

1. α Yu K transformation range collection is combined into the unit vector of coordinate axes: c_i=e (i=1,2 ..., N)；

2. record initial value position vector is P₀=(α₀, K₀)；

3. to i=1,2 ..., N, by P_i-1Move to object function I (A, B) and prolong c_iThe maximum position in direction, writes down this P_i；

4. to i=1,2 ..., N, by c_i+1It is assigned to c_i, juxtaposition c_N=P_N-P₀；

5. by P_NMove to object function I (A, B) at c_NMaximum point on direction, and record the P of this point₀；

6. repeat step 2. to arrive 5., until functional value I (A, B) no longer increases.

Preferred implementation of the present utility model is: also included carrying out Image semantic classification before carrying out image co-registration.

Microwave tomoscan image preprocess method is as follows: big by external interference factor based on microwave Tomography, Image semantic classification we utilize point processing to carry out the extension of contrast, making image clear, feature is obvious, it is assumed that original image f (x, y) tonal range is [a, b], and image g after conversion (x, what tonal range y) was linear extends to [c, d], then there is grey linear transformation expression formula is:

$g(x,y)=\frac{d-c}{b-a}\×\[f(x,y)-a\]+c$

When in image, the grey level distribution of major part pixel is interior at interval [a, b], f_maxGray level for the maximum gray scale of artwork, only very small part has exceeded this interval, then in order to improve reinforced effects, Wo Menling

$g(x,y)=\left\{\begin{array}{cc}c& 0\≤f(x,y)\≤a\\ \frac{d-c}{b-a}\×\[f(x,y)-a\]+c& a\≤f(x,y)\≤b\\ d& b\≤f(x,y)\≤f_{max}\end{array}\right.$

By the linear stretch to image, picture contrast effect can be effectively improved.

Microwave radar image pre-processing method is as follows: owing to microwave radar imaging is in addition to the intrinsic problem speckle noise existed, and there is also the bright spot high-frequency noise of random appearance simultaneously, and we utilize low pass Recursive filtering method that it is carried out pretreatment.

Assume the grey decision-making x of each pixel in the n-th width microwave radar image_n(i j) represents, α is correlation coefficient, then the image y after processing_n(i j) is

y_n(i, j)=α * y_n-1(i, j)+(1-α) * x_n(i, j) (4)

It is appreciated that by formula (4), the value of current each pixel is solely dependent upon the input of this pixel and the output of last time, unrelated with the value of other pixels, and we analyze its frequency characteristic by one-dimensional transform method, analyze the frequency response of each pixel self, i.e. have:

Y (n)=α * y (n-1)+(1-α) * x (n) (5)

Its transmission function is,

H (z)=Y (z)/X (z)=(1-α)/(1-α z^-1) (6)

In l-G simulation test, value α is the amplitude-frequency characteristic of 0.2,0.6 and 0.8, and α value is the biggest, and radio-frequency component is repressed the most severe, weakens speckle noise the most obvious.

Preferred implementation of the present utility model is: multiple described microwave signal antenna elements 2 form multiple ring, multiple around breast area to be measured.Each ring region to be measured to this item parts carries out imaging, and multiple rings complete the overall imaging of measuring targets, and so scanning track is closer to udder shape, and microwave signal is more accurate.Described microwave signal antenna element includes that microwave transmitting antenna and microwave antenna, described microwave transmitting antenna and microwave antenna are fixedly installed side by side.

Preferred implementation of the present utility model is: described microwave signal antenna element 2 can be one, it is also possible to for multiple.Described microwave signal antenna element 2 includes that microwave transmitting antenna and microwave antenna, described microwave transmitting antenna and described microwave antenna are same microwave antenna, described microwave transmitting antenna and described microwave antenna alternation；Described microwave transmitting antenna and described microwave antenna are different microwave antennas, then respectively as launching antenna and reception antenna work.

Preferred implementation of the present utility model is: described microwave signal generating unit 1, for multiple, occurs microwave broadband pulse signal and microwave single-frequency coherent signal respectively.If described microwave signal generating unit 1 is one, alternately there is microwave broadband pulse signal and microwave single-frequency coherent signal.

Of the present utility model having the technical effect that builds a kind of multi-modal microwave breast imaging device, by being mapped in another piece image by the pixel of piece image in described radar detection image and described tomoscan image, make the fusion reaching unanimously to complete this two width image related like vegetarian refreshments on locus of two width images.Can have complementary advantages by using different image modes during diagnosis earlier stage cancer patients, microwave radar imaging utilizes ultra-wideband microwave signal to obtain target scattering center high-resolution in distance, then doppler information is utilized, obtain scattering center high-resolution in lateral separation, both combine two dimension or the dimensional resolution that can obtain target, so that the multidigit high-resolution of target is achieved.Microwave Tomography is by low power microwave directive testee, under the excitation of microwave, measured object produces a scattered field, this scattered field is relevant with the complex dielectric permittivity distribution within measured object, by the measurement to this scattering, obtain the relative dielectric constant of measured object and the distribution of electrical conductivity, the microwave wave circuits and systems of measured object internal object after carrying out corresponding information processing, can be obtained.By both technology successful fusion in this utility model, constitute a set of multi-mode microwave breast imaging system, reach the purpose that imaging quality is complementary.

Above content is to combine concrete preferred implementation further detailed description of the utility model, it is impossible to assert that of the present utility model being embodied as is confined to these explanations.For this utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, it is also possible to make some simple deduction or replace, all should be considered as belonging to protection domain of the present utility model.

Claims (8)

1. a Microwave Scanning breast imaging device, it is characterised in that include microwave signal generating unit, micro- Ripple signal antenna unit, microwave imaging unit, described microwave signal generating unit generation microwave signal, multiple Described microwave signal antenna element scans around breast area to be measured in the form of a ring, multiple described microwave signal antenna lists Unit sends and receives microwave signal, and breast is carried out micro-according to the microwave signal received by described microwave imaging unit Ripple imaging.

Microwave Scanning breast imaging device the most according to claim 1, it is characterised in that described microwave becomes As unit includes radar imagery unit, described microwave signal generating unit generation microwave broadband pulse signal, institute State microwave signal antenna element and send microwave broadband pulse signal, described microwave signal sky to breast area to be measured Line unit receives microwave broadband pulse echo signal, and described radar imagery unit is according to microwave broadband pulse echo Signal generates radar detection image.

Microwave Scanning breast imaging device the most according to claim 1, it is characterised in that described microwave becomes As unit includes Tomography unit, described microwave signal generating unit generation microwave single-frequency coherent signal, Described microwave signal antenna element sends microwave single-frequency coherent signal, described microwave signal to breast area to be measured Antenna element receives microwave single-frequency echo-signal, and described Tomography unit is believed according to microwave single-frequency echo Number generate tomoscan image.

Microwave Scanning breast imaging device the most according to claim 1, it is characterised in that also include merging Output unit, radar imagery unit, Tomography unit, described microwave signal generating unit occurs micro- Ripple wideband pulse signal and microwave single-frequency coherent signal, described microwave signal antenna element is to breast area to be measured Sending microwave broadband pulse signal and microwave single-frequency coherent signal, described microwave signal antenna element receives microwave Wideband pulse echo-signal and microwave single-frequency echo-signal, described radar imagery unit is according to microwave broadband pulse Echo signal form radar detection image, described Tomography unit is raw according to microwave single-frequency echo-signal Becoming tomoscan image, described fusion output unit is by described radar detection image and described tomoscan image Carry out merging output.

Microwave Scanning breast imaging device the most according to claim 1, it is characterised in that multiple described micro- Ripple signal antenna unit forms multiple rings, multiple around breast area to be measured.

Microwave Scanning breast imaging device the most according to claim 1, it is characterised in that described microwave is believed Number antenna element includes microwave transmitting antenna and microwave antenna, described microwave transmitting antenna and described microwave Reception antenna is same microwave antenna, described microwave transmitting antenna and described microwave antenna alternation.

Microwave Scanning breast imaging device the most according to claim 1, it is characterised in that described microwave is believed Number generating unit is multiple, and microwave broadband pulse signal and microwave single-frequency coherent signal occur respectively.

Microwave Scanning breast imaging device the most according to claim 1, it is characterised in that described microwave is believed Number generating unit is one, and microwave broadband pulse signal and microwave single-frequency coherent signal alternately occur.