CN103126654A - Detecting system for near-infared body surface blood vessel detector - Google Patents
Detecting system for near-infared body surface blood vessel detector Download PDFInfo
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Abstract
The invention belongs to the technical field of medical instruments and relates to a detecting system for a near-infared body surface blood vessel detector. The detecting system comprises a digital photography device and a moving projection device. The digital photography device and the moving projection device are in mutual connection and data transmission through a bus control unit, a near-infared lens is installed on the digital photography device and comprises a near-infared filter, and the near-infared filter blocks visible light, lets near-infared light pass and is a bandpass filter. The detecting system for the near-infared body surface blood vessel detector can help professional medical workers to observe body surface blood vessels of a patient, can display blood information such as flow velocity and flow direction at the part in real time, and has a certain curing promoting effect on body surface wound healing and thrombus ablation of superficial layer veins. In clinical application, the detecting system provides great convenience for the medical workers and is of revolutionary significance. The detecting system has good application prospect in the technical field of medical instruments.
Description
Technical field
The invention belongs to technical field of medical instruments, relate to a kind of detection system of near-infrared body surface blood vessel detector.
Background technology
The transfusion conduct by the mode in vein input body, is one of modal clinical treatment means with injection.Obese patient and child be because of its physiological characteristics, and frequent because of its acupuncture treatment transfusion of patients undergoing chemotherapy, all recognizes that to the medical worker blood vessel makes troubles to a certain extent.The near infrared light of specific wavelength can distinguish vein with surrounding tissue, thereby helps the clear body surface blood vessel of observing the patient of professional medical personnel.
This research is intended to develop a kind of detection system of near-infrared body surface blood vessel detector, and by means of this instrument, decapacitation is seen can also see the arteries of shallow table beyond the vein blood vessel of body surface, thereby has overcome the shortcoming of original system function singleness.In addition, this research both can help the clear patient's of observing of professional medical personnel body surface blood vessel, can show in real time again the information such as flow velocity, the flow direction of this position blood, and melted for the thrombosis of the healing of surface wound and shallow-layer vein certain treatment facilitation is arranged.In clinical practice, will provide very large facility to medical personnel.
Summary of the invention
The present invention is directed to the existing market demand, in conjunction with near infrared technology, purpose is to provide a kind of detection system of near-infrared body surface blood vessel detector, makes medical personnel's clear identification of energy and localization of blood vessel, improve puncture success rate, to realize reducing the solution of the misery of patient when puncturing.
In order to solve the problems of the technologies described above, the present invention is solved by following technical proposals:
A kind of detection system of near-infrared body surface blood vessel detector, comprise digital camera and mobile projector device, interconnect and transfer of data by bus control unit between digital camera and mobile projector device, near-infrared camera lenses is installed on digital camera, near-infrared camera lenses comprises the near-infrared filter, near-infrared filter block visible light and allow near infrared light pass through, the near-infrared filter is bandpass filter.
As preferably, bandpass filter is the bandpass filter of vacuum coating.The near-infrared filter is different from the built-in IR-cut filter of general camera, and its effect is block visible light and allow near infrared light pass through, thereby makes the near infrared signal of only having that arrives sensor.The near-infrared filter is bandpass filter normally, is formed by vacuum coating.Logical near infrared band, be plated film on white glass.
As preferably; near-infrared camera lenses also comprises lens protection glass, lenticular unit and optical low-pass filter; near-infrared camera lenses is used for the filtering visible light; near infrared light in 700～1000nm wave-length coverage is passed through; wherein; lens protection glass shields to the optical module of inside, and the near infrared light that lenticular unit collection illuminated object reflects also focuses on it on imageing sensor, and optical low-pass filter is used for being trimmed into irradiating light beam.
As preferably, lenticular unit comprises a plurality of polished glass elements, and optical low-pass filter comprises two or polylith quartz crystal thin plate.Lenticular unit can be comprised of a plurality of independently polished glass elements, can be also to form with transparent plastic compacting, function be with light-ray condensing to photosurface.The aberration that lens have its distinctive spherical aberration, aberration etc. to affect image quality exists, and in order to solve the picture element problem, the lens combination that has adopted different curvature, different materials in lens design is to eliminate or to alleviate its impact.In addition, can also be non-spherical lens, this kind lens help to remove spherical aberration, reduce the lens number, improve the picture element effect.Optical low-pass filter can be made of two or polylith quartz crystal thin plate, is placed on the front of ccd sensor.The light beam of target image information is through producing birefringence (being divided into ordinary light o light beam and abnormal light e light beam) after OLPF.Calculate the sampling cut-off frequency according to size and total photosensitive area of CCD Pixel Dimensions, 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 purpose that weakens or eliminate the low-frequency disturbance striped, particularly the purpose of the pseudo-colours interference fringe of colored CCD appearance.
as preferably, photoelectric sensor also is installed on digital camera, signal amplifier, A/D converter, digital processing unit, bin and PC card, digital camera is caught near infrared signal by skin scattering or reflection by near-infrared camera lenses, then pass through successively photoelectric sensor, signal amplifier, A/D converter and digital processing unit convert digital signal to and temporarily are stored on bin or PC card, wherein, bin has memory function, be integrated in internal system, be used for preservation information, but the PC card is the expanding external memory card, be card or square shape embedding chip, use bin as storage medium.
Photoelectric sensor is to adopt photoelectric cell as the sensor of detecting element.At first it convert measured variation to the variation of optical signal, then further converts optical signal to the signal of telecommunication by photoelectric cell.Photoelectric sensor comprises transmitter, receptor and testing circuit.The transmitter emission light beam that aims at the mark, the light beam of emission generally derives from semiconductor light sources, as: light emitting diode (LED), laser diode and infrared-emitting diode.Light beam is launched incessantly, perhaps changes pulse width.Receptor is comprised of photodiode, phototriode, light cell.In the front of receptor, optical element such as lens and aperture etc. are housed.Its back is testing circuit, and it can leach useful signal and use this signal.
Common photoelectric sensor has CCD photoelectric sensor and CMOS photoelectric sensor, is all both solid state image sensor, has all utilized the photoelectric effect principle of silicon in the light context of detection, and difference is the playback mode of pixel photogenerated charge.The effect of CCD photoelectric sensor is that the optical signal that will receive changes analogue signal into, adopts area array CCD here.Area array CCD comprises a light-sensitive element matrix, and image light energy information is converted to electronic simulation amount information, and the method automatic transmission that the electronic simulation amount information exchange on each pixel is crossed serial scan out.A pixel in each element representative image in matrix.The mode of reading the transmission of employing frame of ccd signal.The two-way ccd signal is respectively as two inputs of differential amplifier circuit, to suppress null offset and noise jamming.A/D converter is digital signal with treated CCD analog signal conversion, gives digital signal processor.And in the CMOS photoelectric sensor, the cmos pixel array, it is a two-dimentional addressable sensor array, every string of sensor is connected with a bit line, row allows line to allow interior each the sensing unit output signal of selected row to send on its corresponding bit line, the bit line end is MUX, independently is listed as addressing according to each row and selects.The CMOS photoelectric sensor has an amplifier in each location of pixels, this just can convert discrete charge signal bag to Voltage-output under very low bandwidth situation, and only need to reset under frame rate.One of advantage of CMOS photoelectric sensor is exactly that it has low bandwidth, and has increased signal to noise ratio.
Digital processing unit, be called for short DSP(DigitalSignal Processor), be one of core component of detection system of the present invention, its major function is by a series of mathematical algorithms, data image signal is optimized processing, comprises the correction of high frequency disturbance and the correction of gamma.It can format view data, then transfers to microminiature moving device and carry out projection.The general flow that image is processed, as shown in Figure 3.1. the brightness in the discrete scenery of automatic exposure algorithm measurement zone, by regulate shutter speed and (or) aperture to be to compensate over-exposed or under-exposed zone.Main target is keep in image the relative contrast between zones of different and reach desired mean flow rate.
Auto-focusing algorithm can be divided into two classes: initiatively algorithm adopts the distance between infrared ray or ultrasonic transmitter and receptor estimation photographing unit and reference object; Passive algorithm is to focus on according to the image that photographing unit receives.In these two kinds of subsystems, multimedia processor is by the various camera lenses of pulsewidth modulation (PWM) signal controlling of its output and the motor of shutter.Automatic exposure control function can also be regulated the automatic gain of sensor and be controlled (AGC) circuit.
2. because sensor contains seldom invalid or defect pixel usually, so can eliminate these defectives by medium filtering, principle is that the sharply variation between pixel is abnormal when a bit fuzzy image of optical treatment.
3. the distortion of the shade of camera lens has reduced the brightness of image of camera lens peripheral region.Chromatic aberration colour play occurs around can making image.Therefore multimedia processor need to be to the conversion of image doing mathematics to proofread and correct these distortion.That picture steadiness compensation or signal exchange are proofreaied and correct in addition on the one hand.
4. bilinear interpolation or bicubic interpolation are fit to process the smooth region of image.Yet, can encounter problems during with these simple algorithm process edges or texture-rich regional.Adaptive algorithm changes algorithm according to topography's characteristics, thereby effect preferably can be provided.An example of adaptive algorithm is based on edge reconstruction.This Algorithm Analysis is around the regional of pixel and determine to complete interpolation on which direction.If it has found the edge near pixel, will carry out along the edge interpolation, rather than cross the edge.Another kind of adaptive algorithm is that hypothesis is whole to liking the invariable hue accent, and this can prevent the sudden change of color gradient in individually to picture.Also have many other anti-mosaic technology, comprise frequency-domain analysis, bayes decision criterion, and neutral net.
5. the RGB image after interpolation is transformed to target output color space (if not being also suitable color space).For compress or on television set the displayed map picture, this generally includes the matrix conversion of RGB, YCbCr, usually comprises that also other gray-scale factor correction circuit is with the adaptation to end display.
Image deliver to display and (or) improve image by various filter actions before medium.For example, edge contour strengthens, pixel threshold processes to reduce noise and the artificial colors deletion is all completed in this stage usually.
7. the post processing image outputs to the purpose display, and normally integrated liquid crystal display (LCD) screen is delivered to image simultaneously multimedia processor operation compression algorithm software, and stored respective memory into and store.
As preferably, the mobile projector device comprises image controller, LCD liquid crystal panel and optically focused camera lens, and image controller is controlled the switching of pixel on the LCD liquid crystal panel according to the image information that receives, thereby the generation image, the first vascularity figure of condenser lens projects on skin.
Common mobile projector device comprises DLP projector, LCD projector and LCOS projector, the principle of LCOS projector is simply introduced herein.
The LCOS projector also comprises illuminator, spectroscope and LCOS chip.
Illuminator---visible light, the General Requirements cold light source, life-span and intensity are optionally selected.The general three-color LED light source of selecting, reduce weight in micro-projector.
Spectroscope---the light of light source is carried out light splitting on demand, be divided into that RGB is trichroism to be processed.Do not need to use in micro-projector.
LCOS chip---LCOS projection belongs to reflective LCD shadow casting technique, its structure is long electric crystal on Silicon Wafer, utilize manufacture of semiconductor make to drive panel (being called again CMOS-LCD), be the aluminium coat of polishing on CMOS, for providing electrode and light anti-interface to penetrate face.Want the coating of liquid crystalline molecule on aluminum metal layer, and adopt latticed framework to be divided into pixel.LCOS chip topmost one deck is transparent ITO electrode and glass-based flaggy.In the LCOS chip structure, adopting the IC driving layer of modern CMOS manufacturing process is the control axis of monoblock chip.From dot structure, the active display driver matrix of the CMOS of LCOS chip back comprises switch (nmos pass transistor), memory capacitance and the aluminium reflection electrode on them for each pixel provides.In the time of work, nmos pass transistor is controlled column data line liquid crystal pixel is charged, and the charging charge in memory capacitance has been set up the voltage difference with respect to control electrode.Carry out deflection so the liquid crystal molecule on top is orientated with intensity according to voltage, thereby the light of coming in and going out what are controlled, form gray scale image.The LCOS projection is divided into three-chip type and one chip usually, uses one chip in micro-projector.
As preferably, the optically focused camera lens comprises filter lens, condenser lens and polaroid, thus by condenser lens with polaroid so that light is concentrated and direction of vibration is consistent that vascularity figure is projected on skin.Filter lens filters the light of light source emission, and filtering infrared ray and ultraviolet are to eliminate them to the detrimental effect of LCOS chip.Condenser lens is concentrated light, increases light intensity.Polaroid makes direction of light consistent, reduces the error that light causes.
As preferably, the detection system of a kind of near-infrared body surface blood vessel detector of the present invention also comprises the near infrared emission device, provides angiography required near infrared light, determines nearly wavelength, the brightness of imaging results the best, thereby determines the LED number; The near infrared emission device comprises even mating plate, makes near infrared light in the situation that LED array the energy uniform irradiation occurs to skin surface.The LED of emission near infrared light can be placed in the camera lens periphery or form separately LED array.When occurring as LED array, can use even mating plate, make the near infrared light uniform irradiation to skin surface.Even mating plate claims again the PC light diffusing sheet, is base material by Merlon, adds diffusant and a kind of optics PC force-bearing plate of making.Diffusant can be evenly distributed in sheet material, makes light when the sheet material, reflects when encountering the diffusant granule, the effect of reflection, scattering, thereby makes light can evenly see through sheet material, but can not expose light source, reaches the variation from point source to area source.
The invention provides a kind of detection system of near-infrared body surface blood vessel detector, in conjunction with near infrared technology, make medical personnel's clear identification of energy and localization of blood vessel, improve puncture success rate, to realize reducing the solution of the misery of patient when puncturing, by means of the detection system of a kind of near-infrared body surface blood vessel detector of the present invention, decapacitation is seen beyond the vein blood vessel of body surface, can also see the arteries of shallow table, thereby overcome the shortcoming of the detection system function singleness of prior art.In addition, detection system of the present invention both can help the clear patient's of observing of professional medical personnel body surface blood vessel, the information such as flow velocity, the flow direction that can show in real time again this position blood, and melt for the thrombosis of the healing of surface wound and shallow-layer vein certain treatment facilitation is arranged.In clinical practice, will provide very large facility to medical personnel, have revolutionary meaning.
Description of drawings
Fig. 1 is the structural representation of the detection system of a kind of near-infrared body surface blood vessel detector of the present invention.
Fig. 2 is the workflow diagram of the detection system of a kind of near-infrared body surface blood vessel detector of the present invention.
Fig. 3 is the workflow diagram that the digital processing unit image described in the embodiment of the present invention is processed.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail.
Embodiment
A kind of detection system of near-infrared body surface blood vessel detector, as shown in Fig. 1 to 2: comprise digital camera 1 and mobile projector device 3, interconnect and transfer of data by bus control unit between digital camera 1 and mobile projector device 3, near-infrared camera lenses 15 is installed on digital camera 1, near-infrared camera lenses 15 comprises near-infrared filter 152, near-infrared filter 152 block visible light and allow near infrared light pass through, near-infrared filter 152 is bandpass filter.
Bandpass filter is the bandpass filter of vacuum coating.
Near-infrared camera lenses 15 comprises lens protection glass 151, lenticular unit 153 and optical low-pass filter 154; near-infrared camera lenses 15 is used for the filtering visible light; near infrared light in 700～1000nm wave-length coverage is passed through; wherein; the optical module of 151 pairs of inside of lens protection glass shields; the near infrared light that lenticular unit 153 collection illuminated objects reflect also focuses on it on imageing sensor, and optical low-pass filter 154 is used for being trimmed into irradiating light beam.
Lenticular unit 153 comprises a plurality of polished glass elements, and optical low-pass filter 154 comprises two or polylith quartz crystal thin plate.
photoelectric sensor 14 also is installed on digital camera 1, signal amplifier 13, A/D converter 12, digital processing unit 11, bin 16 and PC card 17, digital camera 1 is caught near infrared signal by skin scattering or reflection by near-infrared camera lenses 15, then pass through successively photoelectric sensor 14, signal amplifier 13, A/D converter 12 and digital processing unit 11 convert digital signal to and temporarily are stored on bin 16 or PC card 17, wherein, bin 16 has memory function, be integrated in internal system, be used for preservation information, but PC card 17 is expanding external memory cards, be card or square shape embedding chip, use bin 16 as storage medium.The workflow of digital processing unit 11, as shown in Figure 3.
Mobile projector device 3 comprises image controller 31, LCD liquid crystal panel 32 and optically focused camera lens 33, image controller 31 is according to the image information that receives, control the switching of pixel on LCD liquid crystal panel 32, thereby produce image, optically focused camera lens 33 projects to vascularity figure on skin.
Optically focused camera lens 33 comprises filter lens 331, condenser lens 332 and polaroid 333, thus by condenser lens 332 with polaroid 333 so that light is concentrated and direction of vibration is consistent that vascularity figure is projected on skin.
This detection system also comprises near infrared emission device 2, provides angiography required near infrared light, determines nearly wavelength, the brightness of imaging results the best, thereby determines the LED number; Near infrared emission device 2 comprises even mating plate 21, makes near infrared light in the situation that LED array the energy uniform irradiation occurs to skin surface.
During work, first start, then carry out system initialization and imageing sensor setting, and near-infrared light source starts simultaneously, and then digital camera 1 and mobile projector device 3 are started working, and carries out image acquisition, image processing, image output and storage.Near-infrared camera lenses 15 is caught the near infrared signal by skin scattering or reflection, then converts digital signal to through photoelectric sensor 14, signal amplifier 13, A/D converter 12 and digital processing unit 11 successively and temporarily is stored on bin 16 or PC card 17.Image controller 31 is controlled the switching of pixel on LCD liquid crystal panel 32 according to the image information that receives, thereby produces image, and optically focused camera lens 33 projects to vascularity figure on skin.Make medical personnel's clear identification of energy and localization of blood vessel, improve puncture success rate, to realize reducing the misery of patient when puncturing.After finishing using, the inquiry of shutting down, the operation of selecting shutdown or re-starting image acquisition, image processing, image output and store.
In a word, the above is only preferred embodiment of the present invention, and all equalizations of doing according to the present patent application the scope of the claims change and modify, and all should belong to the covering scope of patent of the present invention.
Claims (8)
1. the detection system of a near-infrared body surface blood vessel detector, comprise digital camera (1) and mobile projector device (3), interconnect and transfer of data by bus control unit between digital camera (1) and mobile projector device (3), near-infrared camera lenses (15) is installed on digital camera (1), near-infrared camera lenses (15) comprises near-infrared filter (152), near-infrared filter (152) block visible light and allow near infrared light pass through, it is characterized in that: near-infrared filter (152) is bandpass filter.
2. the detection system of a kind of near-infrared body surface blood vessel detector according to claim 1, it is characterized in that: bandpass filter is the bandpass filter of vacuum coating.
3. the detection system of a kind of near-infrared body surface blood vessel detector according to claim 1; it is characterized in that: near-infrared camera lenses (15) also comprises lens protection glass (151), lenticular unit (153) and optical low-pass filter (154); wherein; lens protection glass (151) shields to the optical module of inside; the near infrared light that lenticular unit (153) collection illuminated object reflects also focuses on it on imageing sensor, and optical low-pass filter (154) is used for being trimmed into irradiating light beam.
4. the detection system of a kind of near-infrared body surface blood vessel detector according to claim 3, it is characterized in that: lenticular unit (153) comprises a plurality of polished glass elements, optical low-pass filter (154) comprises two or polylith quartz crystal thin plate.
5. the detection system of a kind of near-infrared body surface blood vessel detector according to claim 1, it is characterized in that: photoelectric sensor (14) also is installed on digital camera (1), signal amplifier (13), A/D converter (12), digital processing unit (11), bin (16) and PC card (17), digital camera (1) is caught near infrared signal by skin scattering or reflection by near-infrared camera lenses (15), then pass through successively photoelectric sensor (14), signal amplifier (13), A/D converter (12) and digital processing unit (11) convert digital signal to and temporarily are stored on bin (16) or PC card (17).
6. the detection system of a kind of near-infrared body surface blood vessel detector according to claim 1, it is characterized in that: mobile projector device (3) comprises image controller (31), LCD liquid crystal panel (32) and optically focused camera lens (33), image controller (31) is according to the image information that receives, control the switching of the upper pixel of LCD liquid crystal panel (32), thereby the generation image, optically focused camera lens (33) projects to vascularity figure on skin.
7. the detection system of a kind of near-infrared body surface blood vessel detector according to claim 6, it is characterized in that: optically focused camera lens (33) comprises filter lens (331), condenser lens (332) and polaroid (333), by condenser lens (332) with polaroid (333) thus so that light is concentrated and direction of vibration is consistent that vascularity figure is projected on skin.
8. the detection system of a kind of near-infrared body surface blood vessel detector according to claim 1, it is characterized in that: also comprise near infrared emission device (2), provide angiography required near infrared light, determine nearly wavelength, the brightness of imaging results the best, thereby determine the LED number; Near infrared emission device (2) comprises even mating plate (21), makes near infrared light in the situation that LED array the energy uniform irradiation occurs to skin surface.
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| CN103637772A (en) * | 2013-12-04 | 2014-03-19 | 青岛安信医疗器械有限公司 | Wound imaging device |
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| CN104434033A (en) * | 2014-11-28 | 2015-03-25 | 深圳元华医疗设备技术有限公司 | Near-infrared angiography instrument |
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