CN104434033A - Near-infrared angiography instrument - Google Patents
Near-infrared angiography instrument Download PDFInfo
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- CN104434033A CN104434033A CN201410709873.XA CN201410709873A CN104434033A CN 104434033 A CN104434033 A CN 104434033A CN 201410709873 A CN201410709873 A CN 201410709873A CN 104434033 A CN104434033 A CN 104434033A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
- A61B5/0062—Arrangements for scanning
- A61B5/0064—Body surface scanning
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
- A61B5/0075—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence by spectroscopy, i.e. measuring spectra, e.g. Raman spectroscopy, infrared absorption spectroscopy
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
- A61B5/0077—Devices for viewing the surface of the body, e.g. camera, magnifying lens
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/44—Detecting, measuring or recording for evaluating the integumentary system, e.g. skin, hair or nails
- A61B5/441—Skin evaluation, e.g. for skin disorder diagnosis
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Abstract
The invention discloses a near-infrared angiography instrument which comprises a near-infrared light emitting device, a digital photography device and a miniature mobile projection device. The near-infrared light emitting device emits light to the skin, the skin reflects the light towards the digital photography device, the digital photography device is connected with the miniature mobile projection device, and the miniature mobile projection device projects vascular distribution image information to the skin for displaying. The near-infrared angiography instrument has the following advantages of being clear in image, accurate in positioning and capable of performing real-time imaging.
Description
Technical field
The invention belongs to manufacture technology field of medical appliance, be specifically related to a kind of near-infrared angiograph.
Background technology
Near infrared diode light source can according to its specific wavelength, the erythrocyte of venae subcutaneae or tremulous pulse and surrounding tissue difference is come.Its ultimate principle is that near infrared light receives strong scattering (102-103cm-1) and weak absorbing (10-2-10-1cm-1) in biological tissues, in 700-900nm near infrared region, exists one " spectrum window ".In this " spectrum window ", the Absorption of biological tissue to light reduces greatly, and light can enter darker tissue.Because HbO2 Oxyhemoglobin in blood (HbO2) and reduced hemoglobin (Hb) have unique absorption spectrum in near-infrared region, thus Near infrared spectroscopy method (NIRS) becomes the simple and reliable method of blood constituent research in tissue.Utilize spectroscopic method to detect biological tissue, having the features such as safe and reliable, in real time continuous and not damaged, is a kind of human blood glucose method having investigation and application and be worth.
The near-infrared absorption spectrum of HbO2 and Hb as shown in Figure 1.As shown in Figure 1, in blood HbO2 and Hb to the absorptance obvious difference of different wavelengths of light.At red spectral regions (600nm ~ 800nm), the absorptance of Hb is much larger than HbO2; And at infrared spectral region (800nm ~ 1000nm), the absorptance of Hb is less than HbO2; At about 805nm, Hb and HbO2, there is identical absorptance.
Use this effect, Christie company of the U.S. has developed VeinViewer system, for the body surface vein helping medical professional clearly to observe patient fast.In addition, technique also can be applicable to the cosmetic treatment of spider veins.The traditional remedies of spider veins comprises laser therapy and the injection sclerotherapy of local skin.Local laser treatment technology is applicable to little Aranea shape blood vessel, but the skin depth of infiltrating is very shallow, and calcination can be caused to injure to healthy skin.Sclerotherapy is the small-sized netted Aranea shape vein blood vessel that will chemical substance direct injection stimulated to body surface, and this needs multiple injection to stop to make Aranea phenomenon.Utilize near infrared technology, medical worker not only can see the Aranea shape blood vessel of body surface, also can see nursing blood vessel larger under the skin 1cm degree of depth.According to the vascularity of projection, hardening solvent and hardened foam can directly be injected into feeds netted blood vessel, makes it sclerosis and stops feeding.This method stopping feeding blood vessel can eradicate the Aranea shape blood vessel phenomenon of body surface, thus reaches the effect of beautifying.
In addition, near infrared spectroscopy can be used for the detection by quantitative of each histoorgan blood oxygen saturation of human body, due to the importance of cerebral tissue blood supply oxygen supply, the research of cerebral tissue is especially paid close attention to, the blood oxygen condition research of the vitals such as muscle and tissue is also got most of the attention.The effectiveness of this detection method by most operating room and ICU accept.
But there is certain defect in existing near-infrared angiograph in clear picture, accurate positioning, realtime imaging etc.
Summary of the invention
For the above-mentioned technical problem that prior art exists, the invention discloses a kind of near-infrared angiograph.
The present invention takes following technical scheme: near-infrared angiograph, comprise near infrared light discharger, digital camera, micro mobile projection device, near infrared emission device is to skin emission of light, skin reflects to digital camera, digital camera and micro mobile projection device are connected, and the image information of vascularity is projected to skin and shows by micro mobile projection device.
Preferably, near infrared emission device adopts the near infrared ray LED array of 760 and 850nm wavelength.
Preferably, LED establishes 8 altogether, and LED circularizes arrangement.
Preferably, digital camera comprises near-infrared camera lenses, photoelectric sensor, analogue signal processor, A/D analog-digital converter, DC reference module, DSP, static state/dynamic RAM, formatting module, near-infrared camera lenses, photoelectric sensor, analogue signal processor, A/D analog-digital converter, DSP, formatting module are connected successively, DC reference and A/D analog-digital converter are connected, and DSP and static state/dynamic random storage are connected.
Preferably, micro mobile projection device comprises visible LED array, filter, condenser lens and polaroid, LCD, camera lens, image controller, visible LED array is to filter, condenser lens and polaroid emission of light, filter, condenser lens and polaroid and LCD are connected, LCD and camera lens, image controller are connected, image controller receives the vascularity image information of digital camera transmission, and camera lens projects to skin.
Known according to the near-infrared absorption spectrum (as shown in Figure 1) of figure HbO2 and Hb, 760nm and 850nm lays respectively near the absworption peak of reduced hemoglobin and HbO2 Oxyhemoglobin, is more satisfactory wavelength combinations.The light absorption degree of blood is main relevant with content of hemoglobin.
Use the near infrared ray irradiation patient skin of 760 and 850nm wavelength, light then absorbs because of the existence of hemoglobin by blood vessel, and its hetero-organization then produces strong scattering and weak absorbing to light.Therefore, use near-infrared digital photographic arrangement to catch the near infrared light of reflection or scattering, through near-infrared camera lenses, CCD, analogue signal amplification, a series of process such as ADC, DSP, the particular location of blood vessel can be determined.
After the near infrared light captured by digital photographic arrangement carries out digitized processing, micro mobile projection device is according to the near infrared light situation received, and the orderly opening and closing of each pixel on LCD LCD panel, produces image.Wavelength is selected to be the visible LED of 530nm, to its light launched through optical filter filtering infrared ray and ultraviolet, to eliminate their detrimental effects to LCD.Re-use condenser lens and polaroid, to concentrate to make light and direction of vibration is consistent, then can directly vascularity figure be projected on skin through LCD.Whole process is carried out in real time, and therefore vascularity with the movement of patient, respective change can occur.
Near-infrared angiograph of the present invention plays great effect alleviating in patient suffering, service medical worker etc., the present invention carries out function expansion on the basis of prior art, the theoretical conversion of attempting the shallow table of infrared viewing nearly tremulous pulse is real engineering, and this product has novelty.The near-infrared absorption spectrum observing HbO2 and Hb finds, 760nm and 850nm lays respectively near the absworption peak of reduced hemoglobin and HbO2 Oxyhemoglobin, can respectively as the wavelength chooses observing Superficial veins and tremulous pulse.
Near-infrared angiograph of the present invention has following technique effect:
One, clear picture:
(1) after repetition test, determine best LED number (8) and installation site (being arranged on photographic head front ringwise), ensure the uniformity of light in conjunction with even X-ray lamp, eliminate artifact;
(2) employ multiple lens composition camera lens, eliminate the interference of difference and visible ray;
(3) adopt sensor responsive to the near infrared light of particular wavelength region, reduce the interference of the organizational information that visible ray brings further;
(4) use multiple image processing algorithm optimized image, as automatic exposure algorithm can keep image relative contrast, filtering can eliminate invalid or defect pixel etc.;
(5) use digital signal processor, realize realtime imaging.
Two, accurate positioning:
(1) shadow casting technique Lcos is used to project;
(2) can project one to one in real time, ensure the accuracy of projective iteration.
Three, realtime imaging:
(1) FPGA dual processor is used to carry out image procossing and display, fast in real time;
(2) projection and LED panel two kinds of display modes;
(3) Portable light, is applicable to the imaging at the various position of human body.
Accompanying drawing explanation
Fig. 1 is hemoglobin absorption spectrum.
Fig. 2 is near-infrared peripheral vascular imager design frame chart.
Fig. 3 is digital photographic arrangement composition frame chart.
Fig. 4 is image acquisition structured flowchart.
Fig. 5 is near-infrared camera lenses composition schematic diagram.
Fig. 6 is cmos sensor internal structure.
Fig. 7 is image processing pipeline.
Fig. 8 is micro mobile projection device composition frame chart.
Fig. 9 is projector architecture block diagram.
Figure 10 is the control flow chart of primary control program.
Detailed description of the invention
Below in conjunction with accompanying drawing, the preferred embodiment of the present invention is described in detail.
The present embodiment near-infrared angiograph is formed primarily of parts such as near infrared light discharger, digital camera, micro mobile projection device and other devices, and functional block diagram as shown in Figure 2.Near infrared emission device is to skin emission of light, and skin reflects to digital camera, and digital camera and micro mobile projection device are connected, and the image information of vascularity is projected to skin and shows by micro mobile projection device.Digital camera is also connected with image compression module, image compression module and additional logic modules are connected, additional logic modules and main control module, fixing/removable memory, USB HSSI High-Speed Serial Interface are all connected, master control and user's control module are connected, fixing/removable memory and storage control are connected, and storage control and USB HSSI High-Speed Serial Interface are connected.
Near infrared emission device:
The present invention adopt 760 and the near infrared ray LED array of 850nm wavelength be discharger, the brightness of test of many times determination imaging results the best and LED number.The LED launching near infrared light forms annular array around camera lens, and uses even mating plate, makes near infrared light uniform irradiation to skin surface.Even mating plate, also known as PC light diffusing sheet, is a kind of optics PC force-bearing plate that base material adds diffusant and makes by Merlon.Diffusant can be evenly distributed in sheet material, makes light through sheet material, reflect, reflect, the effect of scattering when encountering diffusant granule, thus makes light can not expose light source through sheet material uniformly, reaches the change from point source to area source.
Digital camera:
Digital camera is used for the near infrared signal of catching by skin scattering and reflection, then converts digital signal to and is temporarily stored in inside.Its functional module composition frame chart as shown in Figure 3.Fig. 4 is image acquisition structured flowchart.
Digital camera comprises near-infrared camera lenses, photoelectric sensor, analogue signal processor, A/D analog-digital converter, DC reference module, DSP, static state/dynamic RAM, formatting module, near-infrared camera lenses, photoelectric sensor, analogue signal processor, A/D analog-digital converter, DSP, formatting module are connected successively, DC reference and A/D analog-digital converter are connected, and DSP and static state/dynamic random storage are connected.The technology contents of each submodule is described in detail in detail below.
Near-infrared camera lenses: the camera lens of digital camera adopts common optical lens, adds the near infrared light optical filter of respective wavelength before camera lens, and the light being arrived sensor by camera lens can be made to be required near infrared light.In general; near-infrared camera lenses generally includes following parts: the composition such as optical filter, lenticular unit, optical low-pass filter of lens protection glass, respective wavelength; the optical filter of lens protection glass, respective wavelength, lenticular unit, optical low-pass filter assemble successively, and members schematic diagram as shown in Figure 5.
The optical module of lens protection glass to inside shields.
Near infrared filter (Near Infrared Filter) is different from the built-in IR-cut filter of general camera (IR Cut Filter), its effect is block visible light and allows near infrared light pass through, thus make arrive sensor only have near infrared signal.Near infrared filter is bandpass filter normally, is formed by vacuum coating.Leading to near infrared band, is plated film on white glass.
Lens subassembly is made up of many independently polished glass elements or forms with transparent plastic compacting, and function is on photosurface by light-ray condensing.Lens have its distinctive spherical aberration, aberration etc. affect image quality aberration exist, in order to solve picture element problem, have employed in lens design different curvature, different materials lens combination with eliminate or alleviate its impact.In addition, also can use the method for non-spherical lens, the method contributes to removing spherical aberration, reduces lens number, improves picture element effect.
Optical low-pass filter is mostly made up of two pieces or polylith quartz crystal thin plate, is placed on before ccd sensor.The light beam of target image information produces birefringence (being divided into ordinary light o light beam and abnormal light e light beam) after OLPF.Calculate sampling cut-off frequency according to the size of CCD Pixel Dimensions and total photosensitive area, also can calculate the distance that o light and e light separate simultaneously.Change the target frequency that incident beam will form difference frequency, reach the object weakening or eliminate low-frequency disturbance striped, the object of the pseudo-colours interference fringe of particularly colored CCD appearance.
Photoelectric sensor: photoelectric sensor adopts photoelectric cell as the sensor of detecting element.First it convert measured change to the change of optical signal, then converts optical signal to the signal of telecommunication further by photoelectric cell.
Photoelectric sensor is that the change by the change of light intensity being converted to the signal of telecommunication realizes controlling.In the ordinary course of things, have three parts to form, they are divided into photoelectric sensor: transmitter, receptor and testing circuit.Transmitter aims at the mark transmitted beam, and the light beam of transmitting generally derives from semiconductor light source, light emitting diode (LED), laser diode and infrared-emitting diode.Light beam is launched incessantly, or changes pulse width.Receptor is made up of photodiode, phototriode, light cell.Before receptor, optical element is housed as lens and aperture etc.Be testing circuit after it, it can leach useful signal and this signal of application.
Common photoelectric sensor is CCD and cmos sensor.
CCD type and CMOS type solid state image sensor all make use of the photoelectric effect principle of silicon in light context of detection, and difference is the playback mode of pixel photogenerated charge.The effect of CCD photoelectric sensor changes the optical signal received into analogue signal, adopts area array CCD here.Area array CCD comprises a matrix of light-sensitive elements, image light energy information is converted to electronic die analog quantity information, and the electronic die analog quantity information in each pixel is passed through the method automatic transmission of serial scan out.A pixel in each element representative image in matrix.The reading of ccd signal adopts the mode of frame transmission.Two-way ccd signal respectively as two inputs of differential amplifier circuit, to suppress null offset and noise jamming.Treated CCD analogue signal is converted to digital signal by A/D converter, gives digital signal processor.
Typical cmos pixel array is a two-dimentional addressable sensor array, and its internal structure is shown in Fig. 6.Every string of sensor is connected with a bit line, and row allows each sensing unit output signal in the row selected by line permission to send on the bit line corresponding to it, and bit line end is MUX, independently arranges addressing select according to each row.Cmos image sensor has an amplifier in each location of pixels, and this just can convert voltage to discrete charge signal bag and export under very low bandwidth situation, and only needs to reset under frame rate.One of advantage of cmos image sensor is exactly that it has low bandwidth, and adds signal to noise ratio.
Digital signal processor: digital signal processor is called for short DSP (Digital Signal Processor), it is one of vitals of subsystem, its major function is optimized process by algorithm to data image signal, comprises the correction to high frequency disturbance and the correction of gamma.View data can format by it, then transfers to microminiature moving device and project.The general flow of image procossing is shown in as 7.
1) brightness of the discrete scene regions of automatic exposure algorithm measurement, by regulating shutter speed and (or) aperture to compensate over-exposed or under-exposed region.Main target is the relative contrast that maintains in image between zones of different and reaches required mean flow rate.
Auto-focusing algorithm can be divided into two classes: the distance that proactive algorithm adopts infrared ray or ultrasonic transmitter and receptor to estimate between photographing unit and reference object; Passive algorithm is that the image received according to photographing unit focuses on.In this two subsystem, pulsewidth modulation (PWM) signal that multimedia processor is exported by it controls the motor of various camera lens and shutter.Automatic exposure control function can also regulate automatic growth control (AGC) circuit of sensor.
2) because sensor is usually containing little invalid or defect pixel, so can eliminate these defects by medium filtering, sharply change when principle is the image when optical treatment is a bit fuzzy between pixel is abnormal.
3) the shade distortion of camera lens reduces the brightness of image of camera lens peripheral region.Chromatic aberration can make image peripheral occur colour play.Therefore multimedia processor needs the conversion of image doing mathematics to correct these distortion.That picture steadiness compensates or signal exchange corrects in addition on the one hand.
4) bilinear interpolation or bicubic interpolation are applicable to the smooth region processing image.But, can encounter problems during region with these simple algorithm process edges or texture-rich.Adaptive algorithm changes algorithm according to topography's feature, thus can provide good effect.An example of adaptive algorithm is based on edge reconstruction.This Algorithm Analysis around pixel region and determine to complete interpolation in which direction.If it have found edge near pixel, then will carry out interpolation along edge, instead of cross edge.Another kind of adaptive algorithm be hypothesis whole to as if invariable hue adjust, this can prevent indivedual to picture in the sudden change of color gradient.Also have other anti-mosaic technology many, comprise frequency-domain analysis, bayes decision criterion, and neutral net.
5) the RGB image after interpolation is transformed to target and exports color space (if not being also suitable color space).In order to compress or show image on a television set, this generally includes the matrix conversion of RGB, YCbCr, usually also comprises other gray-scale factor correction circuit with adaptation to end display.
6) image before delivering to display and (or) medium by various filter action sophisticated image.Such as, edge contour strengthen, pixel threshold process with reduces noise and artificial colors deletion usually all complete in this stage.
7) post processing image outputs to object display, normally integrated liquid crystal display (LCD) screen, image is delivered to multimedia processor simultaneously and runs compression algorithm software, and is stored into respective memory and stores.
Micro mobile projection device:
The effect of micro mobile projection device the image information of vascularity is projected to skin show.The composition frame chart of this device as shown in Figure 8, it comprises visible LED array, filter, condenser lens and polaroid, LCD, camera lens, image controller, visible LED array is to filter, condenser lens and polaroid emission of light, filter, condenser lens and polaroid and LCD are connected, LCD and camera lens, image controller are connected, image controller receives the vascularity image information of digital camera transmission, and camera lens projects to skin.
Throw in for the image realizing camera collection realizes image 1:1 ratio through projector, first need to analyze the principle of photographic head, projector imaging; To help to play directive function in the process of experiment.Photographic head and projector are all based on lens imaging; Camera imaging is a picture reduced, and projector imaging is a picture amplified, and analyzes below in conjunction with the imaging law of lens and practical application exploitation.
See Fig. 9, light engine: the projection optical system of projector is also called " ray machine " or " light engine ", working mechanism is: utilize higher source luminance, irradiate display chip (display chip be opto-electronic conversion during), amplify through projection optical system, can by the image projection of chip on screen.Micro projector is in the market still produce on the shadow casting technique basis of secondary projector, has HTPSLCD (liquid crystal micro projection technology) the micro-projection of transmission, DLP (Texas Instruments exploitation optical digital computing technology) and LCOS (liquid crystal on silicon) reflects the shadow casting techniques such as projection that decline.
LED drives: because micro optical-mechanical generally all adopts large power white light LED to be used as light source.Its requirement is operated in reliable constant current state, and the LED depending on use is different, the connected mode of inner LED is different, and need load different electric currents.Therefore a design reliable high power constant-current source is powered to LED is necessary.When design LED constant current source, need emphasis to consider the electrical characteristic, connected mode etc. of LED in ray machine, if battery powered, also will consider external input voltage mobility scale; Constant-current source efficiency, constant-current source PWM adjusting range.Some charged battery-powered machinery requirement can be operated in low-luminance mode, to extend service time of battery, therefore also will consider that this constant-current source can adjust electric current more easily, have Enable Pin, is convenient to utilize microcontroller switch constant-current source.
Power management: a stable power solution can ensure the even running of hardware circuit.Power module is made up of several separate Voltage stabilizing modules usually; the object done like this is to reduce mutual crosstalk between each power supply in the entire system; power supply mode between disparate modules is different; simultaneously in order to improve stability, the safety of system; therefore be the ripple needing to consider different electrical power in designing power supply management, open circuit, short-circuit protection.
Display floater drives: different light engines may adopt display chip also different, therefore needs to design different display floaters for corresponding display floater and drives.The video stream signal of FPGA process entered display floater and drove the digital video signal being converted into panel and can receiving, and realized the normal display of image on screen.
Auxiliary electron function: the overvoltage of main surveillance, overcurrent, superheat state, when voltage in system, electric current too high or too low time timely cutting system work, particularly LED current/voltage.LED due to current photoelectric transformation efficiency be not also very high, the particularly white light LED part of super high power, at work himself heating more severe.And LED itself be one to the very sensitive device of heat.Bad if dispelled the heat, the old and feeble in advance of LED Internal Fluorescent powder will be caused, affect brightness and export.Also have LED drive circuit itself and display floater also all can produce a large amount of heat in whole system, in the space of a relative closure, the gathering of heat is a very test for the stable operation of system, therefore the variations in temperature of Real-Time Monitoring whole system is also needed when system works, also want cutting system work when temperature is too high, system is lowered the temperature as early as possible.
FPGA video frequency signal processing: by the image of camera collection, in order to the position effectively reflecting human vas can be confirmed, need to carry out certain process to the image of shooting, finally want 1:1 ground to throw on certain position of human body, also need to carry out convergent-divergent according to the distance of projector to image to image in this process; Finally the video stream signal handled well is sent to display floater driving chip.
Above-mentionedly can the vascularity image projected on skin to be preserved and be exported by USB interface, thus can by image transmitting to PC to analyze further or to process.The present embodiment system realizes the logic control of each device or parts by overall control circuit or primary control program, coordinates to realize the unified of each operation and controls.Primary control program chip MCU manages all parts of this subsystem and task.When switching on power MCU start to check whether each parts are in can duty, if there is a part to break down, then there are the printed words of mistake in projection, and quit work.If all are normal, so subsystem is just in ready state.The control flow of primary control program is see Figure 10.
Above the preferred embodiments of the present invention and principle are described in detail, for those of ordinary skill in the art, according to thought provided by the invention, detailed description of the invention will change, and these changes also should be considered as protection scope of the present invention.
Claims (5)
1. near-infrared angiograph, it is characterized in that comprising near infrared light discharger, digital camera, micro mobile projection device, near infrared emission device is to skin emission of light, skin reflects to digital camera, digital camera and micro mobile projection device are connected, and the image information of vascularity is projected to skin and shows by micro mobile projection device.
2. near-infrared angiograph as claimed in claim 1, is characterized in that: near infrared emission device adopts the near infrared ray LED array of 760 and 850nm wavelength.
3. near-infrared angiograph as claimed in claim 2, is characterized in that: LED establishes 8 altogether, and LED circularizes arrangement.
4. near-infrared angiograph as claimed in claim 1, it is characterized in that: digital camera comprises near-infrared camera lenses, photoelectric sensor, analogue signal processor, A/D analog-digital converter, DC reference module, DSP, static state/dynamic RAM, formatting module, near-infrared camera lenses, photoelectric sensor, analogue signal processor, A/D analog-digital converter, DSP, formatting module are connected successively, DC reference and A/D analog-digital converter are connected, and DSP and static state/dynamic random storage are connected.
5. near-infrared angiograph as claimed in claim 1, it is characterized in that: micro mobile projection device comprises visible LED array, filter, condenser lens and polaroid, LCD, camera lens, image controller, visible LED array is to filter, condenser lens and polaroid emission of light, filter, condenser lens and polaroid and LCD are connected, LCD and camera lens, image controller are connected, image controller receives the vascularity image information of digital camera transmission, and camera lens projects to skin.
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