CN205729361U - A kind of multi-modal Microwave Scanning imaging device - Google Patents

Abstract

This utility model relates to a kind of multi-modal Microwave Scanning imaging device, microwave signal generating unit generation microwave broadband pulse signal and microwave single-frequency coherent signal, microwave signal antenna element with linear array around region to be measured rotation sweep or with linear array region the most to be measured motion scan, microwave signal antenna element launches microwave broadband pulse signal and microwave single-frequency coherent signal, 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 image output unit.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.

Description

A kind of multi-modal Microwave Scanning imaging device

Technical field

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

Background technology

During medical treatment detects, generally include X-ray and take the photograph sheet, color ultrasound, magnetic resonance and histology.X It is high that light takes the photograph chip resolution, but along with ionizing radiation, is not suitable for the generaI investigation of patient.Color ultrasound detection is without radiation Property infringement, but part cancer sufferer, calcification point and burr poplar structure can not be shown, and by inspecting doctor Experience influence is big.Costly, imaging time is long, and histological examination also needs to be accurately positioned, such as molybdenum in magnetic resonance Target is inducted into pin, color ultrasound guidance enters pin etc..Therefore, these current detection meanss are not particularly suited on a large scale Cancer sufferer examination, in particular for the vast rural area of China, medical facilities and universal the most uneven Under conditions of weighing apparatus, and the Clinical detection of microwave imaging has, effect low without ionizing radiation, cost and X-ray phase When, 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, becomes especially for breast Picture, is for subregion, has again definite shape simultaneously, and the shape of microwave antenna and scan mode are to breast Room imaging has important function.Prior art does not have the Microwave Scanning apparatus and method being specifically designed for breast, Imaging effect is by extreme influence.

Utility model content

This utility model solves the technical problem that and is: builds a kind of multi-modal Microwave Scanning imaging device, overcomes Prior art does not have the Microwave Scanning apparatus and method being specifically designed for breast, and imaging effect is by very big shadow The technical problem rung.

The technical solution of the utility model is: provide a kind of multi-modal Microwave Scanning imaging device, including Microwave signal generating unit, microwave signal antenna element, microwave signal process unit, radar imagery unit, Tomography unit, image output unit, microwave signal generating unit generation microwave broadband pulse signal With microwave single-frequency coherent signal, microwave signal antenna element with linear array around region to be measured rotation sweep or With linear array region the most to be measured motion scan, microwave signal antenna element launches microwave broadband pulse signal With microwave single-frequency coherent signal, microwave signal antenna element receives microwave broadband pulse echo signal and microwave list Frequently 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, and described image is defeated Go out unit to carry out described radar detection image and described tomoscan image merging output.

Further technical scheme of the present utility model is: described microwave signal antenna element includes Microwave emission sky Line and microwave antenna.

Further technical scheme of the present utility model is: described microwave transmitting antenna and described microwave antenna For 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, sends out respectively Raw microwave broadband pulse signal and microwave single-frequency coherent signal.

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

Further technical scheme of the present utility model is: described microwave signal antenna element is around three-dimensional region to be measured Rotation sweep or microwave signal antenna element are relative to planar region to be measured motion scan.

Of the present utility model having the technical effect that builds a kind of multi-modal Microwave Scanning imaging device, including microwave Signal generating unit, microwave signal antenna element, microwave signal process unit, radar imagery unit, tomography Scanning and imaging unit, image output unit, microwave signal generating unit generation microwave broadband pulse signal and micro- Ripple single-frequency coherent signal, microwave signal antenna element with linear array around region to be measured rotation sweep or with line Type arranges region the most to be measured motion scan, and microwave signal antenna element launches microwave broadband pulse signal and micro- Ripple single-frequency coherent signal, microwave signal antenna element receives microwave broadband pulse echo signal and microwave single-frequency is returned Ripple signal, described radar imagery unit generates radar detection image, institute according to microwave broadband pulse echo signal State Tomography unit to export according to microwave single-frequency echo signal form tomoscan image, described image Described radar detection image and described tomoscan image are carried out merging output by unit.This utility model microwave Signal antenna unit with linear array around region to be measured rotation sweep or with linear array region the most to be measured move Dynamic scanning, and send and receive microwave signal, swept based on udder shape by microwave signal antenna element Retouching, 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 one Multi-modal Microwave Scanning imaging device, including microwave signal generating unit 1, microwave signal antenna element 2, thunder Reach image-generating unit 3, Tomography unit 4, image output unit 5, microwave signal generating unit 1 Raw microwave broadband pulse signal and microwave single-frequency coherent signal, microwave signal antenna element 2 with linear array around Region to be measured rotation sweep or with linear array region the most to be measured motion scan, microwave signal antenna element 2 launch microwave broadband pulse signal and microwave single-frequency coherent signal, and microwave signal antenna element 2 receives microwave Wideband pulse echo-signal and microwave single-frequency echo-signal, described radar imagery unit 3 is according to microwave broadband arteries and veins Rushing echo signal form radar detection image, described Tomography unit 4 is believed according to microwave single-frequency echo Number generate tomoscan image, described radar detection image and described tomography are swept by described image output unit 5 Tracing is as merging.In specific embodiment, described image output unit 5 by described radar detection image and Described tomoscan image carries out merging output.In specific embodiment, described microwave signal antenna element is around vertical Body region to be measured rotation sweep or microwave signal antenna element are relative to planar region to be measured motion scan.

Specific implementation process is as follows: described microwave signal generating unit 1 is right by microwave signal antenna element 2 There is microwave broadband pulse signal and microwave single-frequency coherent signal, described microwave signal generating unit in region to be measured 1 operating frequency range is 1 to 30GHz.Described microwave signal antenna element 2 receives microwave broadband pulse and returns Ripple signal and microwave single-frequency echo-signal, microwave signal antenna element 2 rotates around region to be measured with linear array Scan or with linear array region the most to be measured motion scan, send and receive microwave signal, receive microwave Wideband pulse echo-signal, microwave radar image-forming principle utilizes theory of SAR, with a miniature antenna As single radiating element, the continuous motion scan in direction along a straight line, select some positions to launch in movement Signal, receives the corresponding echo-signal launching position, and storage receives amplitude and the phase place of signal.By micro- Ripple signal antenna unit record receives the time of microwave scattering signal, can calculate time delay, and Microwave emission The distance of antenna and focus is fixed, therefore available micro-transmitting antenna is to the distance of focus, thus carries out accurately Imaging.The microwave single-frequency echo-signal received, microwave wave circuits and systems method is similar to computed tomography (CT), A kind of THE INVERSE ELECTROMAGNETIC SCATTERING method, by scattering object external observation to electromagnetic field come inversion imaging region Electromagnetic signature parameter distribution, thus judge the information such as the position of scattering object target, shape and size distribution.Will The microwave single-frequency echo-signal received, according to electromagnetic signature parameter distribution and the position of scattering object target, shape Tomoscan image is generated with distribution of sizes information.Described radar imagery unit 3 returns according to microwave broadband pulse Ripple signal generates radar detection image, and described Tomography unit 4 is raw according to microwave single-frequency echo-signal Become tomoscan image.Described image output unit 5 is by described radar detection image and described faulted scanning pattern During in Xiang, the pixel of piece image is mapped to another piece image, make two width images related like vegetarian refreshments in space Reach unanimously to complete the fusion of this two width image on position.

Image co-registration includes multiple method: a kind of method is labelling method, and described image output unit 5 also includes Image tagged module 51, image tagged identification module 52, image optimization module 53, described image tagged mould Block 51 is marked at the characteristic point of image in described radar detection image and described tomoscan image Note, overlaps the image tagged of described radar detection image and described tomoscan image to described radar detection Image and described tomoscan image merge.Described image tagged identification module 52 is by described radar detection The image tagged of image and described tomoscan image is identified.After described image optimization module 53 is to labelling Image be optimized.When image co-registration, by described radar detection image and described tomoscan image Image tagged is identified, and then as boundary mark, identification image is carried out image co-registration.In specific embodiment, After being marked, image is optimized.Image tagged software design become using the Feature point recognition of image as The boundary mark of image synthesis.Image tagged software according to described radar detection image and tomoscan image to tissue Labelling, the labelling of lymph node identification and the labelling of characteristic identified, forms coincidence point on coordinate axes, Completing described radar detection image and the fusion of tomoscan image, the method is equally applicable to other mode groups The two dimension closed or 3-D view.Further comprises the display to multi-modal microwave breast image, the two of display breast Peacekeeping three-dimensional information, the labelling to focal area.Another kind of method is pixel weighted mean method, it may be assumed that by institute State the image pixel weighted average of radar detection image and described tomoscan image correspondence position to complete image and melt Close.

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 in the picture Same position so that it is there is the process of identical space coordinates.

In the microwave tomoscan image registration with microwave radar image, by metastable microwave tomoscan Image is as reference picture I, using microwave radar image as floating image II, carries out based on pixel maximum mutual The image registration of information law.

Rigid body translation includes transformation of scale, in two-dimensional image I I, and point (x₁, y₁) arrive through rigid transformation 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.Regard the gray value of two images subject to registration as two stochastic variables respectively A and B, scope 0 to 255, marginal probability distribution is respectively P_A(a) and P_BB (), joint probability is divided Cloth is P_AB(a, b), then edge entropy and the combination entropy that can obtain A Yu B are respectively as follows: H (A), H (B) With 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, the gray scale of they respective pixel is mutual Relevant information value I (A, B) should reach maximum.

Registration optimizes.After rigid body translation completes, described image optimization module 53 is optimized, it may be assumed that find one Plant similarity side degree and weigh the similarity degree of two width images, need continuous transformation parameter α and K so that Similar side degree reaches optimum, and wherein scale parameter K excursion is 0 to 1, and rotation angle range is 0 to arrive 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 that before carrying out image co-registration carrying out image locates in advance Reason.

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

$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_maxMaximum gray scale for artwork Level, the only gray level of very small part have 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 except the intrinsic problem speckle existed Outside spot noise, there is also the bright spot high-frequency noise of random appearance, we utilize low pass Recursive filtering method simultaneously 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 relevant 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)

By formula (4) it is known that the value of current each pixel is solely dependent upon the input and upper of this pixel Secondary output, unrelated with the value of other pixels, we analyze its frequency by one-dimensional transform method Characteristic, analyzes the frequency response of each pixel self, i.e. has:

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 high frequency becomes Divide repressed the most severe, weaken speckle noise the most obvious.

Preferred implementation of the present utility model is: microwave signal generating unit 1 occurs microwave signal, according to The shape in region to be measured, microwave signal antenna element 2 arranges around region to be measured rotation sweep with rectilinear form, Or arrange around region to be measured rotation sweep with arc shape.When region to be measured is three-dimensional, microwave signal antenna Unit 2 is around region to be measured rotation sweep；When region to be measured is planar, microwave signal antenna element 2 phase is treated Survey region motion scan.

Preferred implementation of the present utility model is: described microwave signal antenna element 2 can be one, also Can be multiple.Described microwave transmitting antenna launches microwave signal, and described microwave antenna receives microwave letter Number.

Preferred implementation of the present utility model is: described microwave signal antenna element 2 includes Microwave emission sky Line 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 micro- Ripple reception antenna is not same microwave antenna, described microwave transmitting antenna and described microwave antenna work respectively Make.

Of the present utility model having the technical effect that builds a kind of multi-modal Microwave Scanning imaging device, by by institute State the pixel of piece image in radar detection image and described tomoscan image and be mapped to another piece image In, 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, micro- Ripple radar imagery utilizes ultra-wideband microwave signal to obtain target scattering center high-resolution in distance, so After utilize doppler information, it is thus achieved that scattering center high-resolution in lateral separation, both combinations can obtain Obtain two dimension or the dimensional resolution of target, so that the multidigit high-resolution of target is achieved.Microwave tomography Scanning imagery is by low power microwave directive testee, and under the excitation of microwave, measured object produces a scattering , 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, can obtain after carrying out corresponding information processing The microwave wave circuits and systems of measured object internal object.By both technology successful fusion in this utility model, constitute A set of multi-mode microwave breast imaging system, reaches the purpose that imaging quality is complementary.

Above content be combine that this utility model made by concrete preferred implementation the most specifically Bright, it is impossible to assert that of the present utility model being embodied as is confined to these explanations.For belonging to this utility model For the those of ordinary skill of technical field, without departing from the concept of the premise utility, it is also possible to do Go out some simple deduction or replace, all should be considered as belonging to protection domain of the present utility model.

Claims (6)

1. a multi-modal Microwave Scanning imaging device, it is characterised in that include microwave signal generating unit, Microwave signal antenna element, microwave signal process unit, radar imagery unit, Tomography unit, Image output unit, microwave signal generating unit generation microwave broadband pulse signal and microwave single-frequency coherent signal, Microwave signal antenna element with linear array around region to be measured rotation sweep or with linear array district the most to be measured Territory motion scan, microwave signal antenna element transmitting microwave broadband pulse signal and microwave single-frequency coherent signal, Microwave signal antenna element receives microwave broadband pulse echo signal and microwave single-frequency echo-signal, described radar Image-generating unit generates radar detection image, described Tomography list according to microwave broadband pulse echo signal Unit is according to microwave single-frequency echo signal form tomoscan image, and described radar is visited by described image output unit Altimetric image and described tomoscan image carry out merging output.

The most multi-modal Microwave Scanning imaging device, it is characterised in that described microwave Signal antenna unit includes microwave transmitting antenna and microwave antenna.

The most multi-modal Microwave Scanning imaging device, it is characterised in that described microwave Launch antenna and described microwave antenna is same microwave antenna, described microwave transmitting antenna and described microwave Reception antenna alternation.

The most multi-modal Microwave Scanning imaging device, it is characterised in that described microwave Signal generating unit is multiple, and microwave broadband pulse signal and microwave single-frequency coherent signal occur respectively.

The most multi-modal Microwave Scanning imaging device, it is characterised in that described microwave Signal generating unit is one, and microwave broadband pulse signal and microwave single-frequency coherent signal alternately occur.

The most multi-modal Microwave Scanning imaging device, it is characterised in that described microwave Signal antenna unit around three-dimensional region to be measured rotation sweep or microwave signal antenna element relative to planar district to be measured Territory motion scan.