CN101493579B - Reading-out device of X-ray imaging system of computer - Google Patents
Reading-out device of X-ray imaging system of computer Download PDFInfo
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- CN101493579B CN101493579B CN200910076601XA CN200910076601A CN101493579B CN 101493579 B CN101493579 B CN 101493579B CN 200910076601X A CN200910076601X A CN 200910076601XA CN 200910076601 A CN200910076601 A CN 200910076601A CN 101493579 B CN101493579 B CN 101493579B
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Abstract
The invention relates to a reading device of the X-ray imaging system of a computer, consisting of a fluorescence excitation system, a fluorescence receiving system and a scanning system; the fluorescence excitation system is formed by that an excitation light source, a first optical filter, a beam-expansion collimation system and a spectroscope are sequentially arranged on an optical axis O1O2; the spectroscope and a scanning prism are sequentially arranged on an optical axis O2O3 which is coaxial to the optical axis O1O2; and the scanning prism, a scanning arm and a scanning lens are sequentially arranged on a same optical axis O3O4 which is vertical to the optical axis O2O3; the fluorescence receiving system consists of a scanning lens, a scanning arm, a scanning prism, a spectroscope,a fluorescence collecting lens, a second optical filter, a photoelectric detector and a data collecting system; the scanning system consists of a scanning motor, a scanning prism, a scanning arm, a scanning lens, a film-transport motor and a plurality of film-transport rollers; and the data collecting system is connected with a computer which is connected with the excitation light source, the scanning motor and the film-transport motor. The device is easy to be executed, and has compact structure and high sensitiveness of the image information.
Description
Technical field
The present invention relates to a kind of optical readout device, be meant a kind of reading-out device of X-ray imaging system of computer especially.A kind of latent image readout device of X-ray imaging system of computer, this device can be read latent image from the image plate.
Background technology
Computer X-ray photography (Computed Radiography, CR) be a kind of digital X line camera work of comparative maturity, it is with image plate (Imaging Plate, IP) as rocording information carrier, the image plate is sent into readout device and is read X line image information behind the X line exposing, by Computer Processing, draw the relevant information of measured object again.CR is mainly used in the medical science aspect at present, also shows very broad development prospect in fields such as industrial flaw detection detections simultaneously.
The process that reads of image plate latent image is exactly to use the laser of specific wavelength as excitation source, through optical scanning system the image plate that has latent image is scanned evenly and rapidly, and the fluorescence that inspires is sent to is converted into electric signal in the photodetector, electric signal is that digital signal becomes the image that can observe on computers through analog to digital conversion.
At present, existing C R read-out system generally adopts dull and stereotyped flying-spot scanner mode.Reading device is that the technology emphasis of CR system and difficult point are the light beams that send of laser instrument through the polyhedral prism of high speed rotating and f θ lens focus on the image plate, and the image plate is carried out point by point scanning in certain direction, (electrooptical device adds amplifier to exciting light by placing near the sweep trace photocon to collect to enter detector, light signal is become electric signal, electric signal through amplifying, converts data image signal to by A/D more at last).After one line scanning of image plate was finished, carrying platform made the image plate carry out the scanning of next line again along the small distance of advancing perpendicular to the direction of sweep trace by Electric Machine Control, up to the scanning of finishing whole image plate.
In flying spot scanning, in general photo-scanning system all is to adopt the mode of polyhedral prism rotation and f θ lens imaging, and this mode volume is big, complex structure, and phosphor collection efficient is low.In order to improve the collection efficiency of fluorescence, people such as the Brandt of KODAK company have proposed the optical waveguide collection mode in patent US.PAT.NO.5541421.In order to reduce system bulk, further improve collection efficiency, people such as Koren are at patent US.PAT.NO.6, have proposed circular arc scanning CR readout device as shown in Figure 1 in 291,831.System comprises that 22, one of 26, one facet catoptrons of 18, one flat reflective mirrors of a laser instrument are positioned over detector test surface 20 optical filter 24 before.The excitation beam that laser instrument 18 sends is reflected to image plate 14 after reaching facet catoptron 22 through incident passage 28, image plate 14 is inspired fluorescence later on by laser pumping, a fluorescence part of dispersing is propagated forward and is arrived flat reflective mirror 26, another part fluorescence reflexes to flat reflective mirror 26 through ellipsoid, injected photodetector 20 by the fluorescence after 26 reflections through filter plate 24, finish the reception of fluorescence.The situation that on behalf of light, the line of band arrow propagate and reflect in the chamber among the figure.Be of the scanning of realization laser to image plate 14, optical cavity passage 28, flat reflective mirror 26, and facet catoptron 22 is done as a whole will the rotation around central axis 30.In order to separate fluorescence and exciting light, the facet catoptron is installed on the center pit of flat reflective mirror 26.The major defect of above-mentioned fluorescence readout device is: laser excitation adopts different optical elements and phosphor collection device plane mirror center to need preformed hole that the Laser emission mirror is installed respectively with collection system, reduced collection efficiency, increased the realization difficulty, the cost height, device is complicated.
Summary of the invention
The product that the objective of the invention is to avoid above-mentioned weak point of the prior art and a kind of computing machine radiation imaging system readout device is provided.A kind ofly be easy to realize, X-ray imaging system of computer (CR) readout device simple in structure.
Purpose of the present invention can reach by following measure:
A kind of reading-out device of X-ray imaging system of computer is made of exciting light source, optical filter, image plate, photodetector scanning system,
This device is made of fluorescence excitation system, fluorescence receiving system, scanning system,
The fluorescence excitation system: exciting light source, first optical filter, beam-expanding collimation system, spectroscope are sequentially arranged in optical axis O
1O
2On, spectroscope, scanning prism are sequentially arranged in optical axis O
2O
3On, optical axis O
1O
2With optical axis O
2O
3Coaxial, scanning prism, scan arm, scanning lens are sequentially arranged in same optical axis O
3O
4On, light is through 90 ° of scanning prism scanning refractions, optical axis O
1O
2With optical axis O
2O
3On same optical axis, and with optical axis O
3O
4Vertically, image plate vertical incidence light beam;
The fluorescence receiving system: be made up of scanning lens, scan arm, scanning prism, spectroscope, phosphor collection lens, second optical filter, photodetector and data acquisition system (DAS), spectroscope, phosphor collection lens, second optical filter, photodetector are sequentially arranged in same optical axis O
2O
5On, optical axis O
3O
4With optical axis O
2O
5Parallel, optical axis O
2O
5With optical axis O
1O
2Or optical axis O
2O
3Vertically;
Scanning system: constitute by scan module, scanning prism, scan arm, scanning lens, film trasport motor and several film trasport rollers;
Data acquisition system (DAS) is connected with computing machine, and computing machine is connected with exciting light source, scan module, film trasport motor
Wherein:
The image plate becomes semi-cylindrical shaped around scanning system, and the arc surface that image plate photosensitive surface is surrounded just overlaps with the arc surface that the focus rotation of scanning lens forms;
Spectroscopical optical axis and optical axis O
1O
2Angle is 45 °;
Described exciting light source is any in laser, light emitting diode, other monochromatic source;
Described scanning mirror can be any of prism, level crossing, spherical mirror, aspheric mirror;
Described scanning lens is the optical component with the characteristic of converging, and is any of the complex lens that constitutes of the simple lens that constitutes of biconvex lens, plano-convex lens, concave-convex lens, achromat or cemented doublet, three balsaming lenss, non-spherical lens or lens combination;
Described colimated light system is the system that makes light collimation, is any in simple lens, lens combination, the catoptron;
Described photodetector is any in photomultiplier, photon counter, avalanche diode, the silicon photocell.
Exciting light source, first optical filter, beam-expanding collimation system, spectroscope are sequentially arranged in optical axis O
1O
2On, spectroscope, scanning prism are sequentially arranged in optical axis O
2O
3On, its optical axis O
1O
2With optical axis O
2O
3Vertical mutually;
Spectroscope, phosphor collection lens, second optical filter, photodetector are sequentially arranged in same optical axis O
2O
5On, spectroscope, scanning prism are sequentially arranged in optical axis O
2O
3On, optical axis O
2O
5With optical axis O
2O
3On same optical axis.
Described scanning prism can be used scanning mirror instead.
The present invention has following advantage compared to existing technology:
The present invention be a kind ofly be easy to realize, X-ray imaging system of computer (CR) readout device simple in structure.
2. reasonable in design of the present invention has strengthened the image information collection efficiency, effectively raises the sensitivity of image information.
Description of drawings
Fig. 1 patent US.PAT.NO.6, the read-out system structure in 291,831;
Fig. 2 represents a CR read-out system synoptic diagram;
Fig. 3 represents a CR read-out system skeleton view consistent with preferred embodiment of the present invention;
Fig. 4 is another CR read-out system skeleton view consistent with preferred embodiment of the present invention;
Fig. 5 represents spectroscopical detailed characteristics synoptic diagram in the CR read-out system;
Fig. 6 represents fluorescent emission intensity and fluorescent emission direction relations.
The figure number explanation
1 ... exciting light source 2 ... first narrow band pass filter 3 ... beam-expanding collimation system 4 ... spectroscope 5 scanning mirrors 6 ... scan module 7 scan arms 8 ... scanning lens 9 ... image plate 10 ... optical filter 11 ... photodetector 12 ... data acquisition system (DAS) 13 ... computing machine 15 ... film trasport motor 16 ... the film trasport roller
Embodiment
A CR readout device is used for reading the latent image information that is stored on the image plate, comprises
Fluorescence excitation System,
Fluorescence gathering systemWith
Scanning system.Comprise oneExciting light source is used for launching the exciting light of certain wavelength, can inspire fluorescence from the image plate; One first optical filter is arranged between exciting light source and the exciting light colimated light system, has optical anti-reflective film, is used for by exciting light, stops that the light of other wavelength passes through; An exciting light colimated light system is between optical filter and the spectroscope, has one group of lens or lens combination and a lens barrel, is used for the exciting light beam-expanding collimation, is convenient to obtain on the image plate less hot spot; A spectroscope, has a reflecting surface, being used for making the exciting light transmission to be delivered to image plate scanning mirror gets on, and the fluorescence after the scanning mirror refraction that the image plate sends is reflexed on the light-sensitive surface of fluorescent probe, and described spectroscope is between colimated light system and the scanning mirror, and wherein reflecting surface is pitch angle at 45 with respect to the optical axis of the exciting light that sends and the optical axis of fluorescence; A scanning mirror, between spectroscope and scanning lens, be used for making exciting light that 90 ° of deflections take place, perpendicular to the outgoing of colimated light system optical axis, also be used to make the fluorescence that returns that 90 ° of deflections also take place, incide on the spectroscope, described scanning mirror is installed on the scan module, can drive exciting light and be rotated, be used for the image plate is scanned around motor shaft; A scanned-lens system, between scanning mirror and image plate, its optical axis is perpendicular to the image plate, focus is positioned at image plate surface, be used for making exciting light to focus on the image plate, also be used for excited fluorescent on the image plate is collected convergence, form the collimated light that is parallel to optical axis, incide on the scanning mirror; Another second optical filter is arranged between the spectroscope and the second phosphor collection lens, has optical anti-reflective film, is used for by excited fluorescent, stops that the light of other wavelength passes through, and improves system signal noise ratio; One second phosphor collection lens only allow the light of fluorescence wave band to pass through, and are used for collimate fluorescent is converted into little hot spot, incide on the photovoltaic collectors spare; A photovoltaic collectors spare is arranged on phosphor collection lens back, be used for the fluorescence of incident is carried out opto-electronic conversion, and the voltage after the conversion is directly proportional with the incident fluorescence light intensity magnitude.
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Fluorescence read-out system of the present invention comprises fluorescence excitation system and fluorescence receiving system, adds to constitute latent image reading scan system after the scanning system.The core of described fluorescence read-out system be to the coaxial transmission of exciting light and fluorescence with separate.
Fig. 2 to Fig. 6 is the various views with the corresponding to optical pickup system of the present invention.
As shown in Figure 3, consistent with the present invention optical pickup system comprises 1, one first narrow band pass filter 2 of an exciting light source, 4, one scanning mirrors 5 of 3, one spectroscopes of a beam-expanding collimation system, 7, one scanning lenses 8 of 6, one scan arms of a scan module, an image plate 9,11, one data acquisition systems 12 of 10, one photodetectors of one second optical filter, 13, one film trasport motors of a computing machine 15 and several film trasport rollers 16 and control corresponding and treatment circuit.Wherein exciting light source 1, first optical filter 2, beam-expanding collimation system 3, spectroscope 4, scanning mirror 5, scan arm 7, scanning lens 8 and image plate 9 constitute the fluorescence excitation systems; Scanning lens 8, scan arm 7, scanning mirror 5, spectroscope 4, phosphor collection lens 14, second optical filter 10, photodetector 11 and data acquisition system (DAS) 12 are formed the fluorescence receiving system; Scan module 6, scanning mirror 5, scan arm 7, scanning lens 8, film trasport motor 15 and film trasport roller 16 constitute scanning system.All elements of fluorescence excitation system axis, fluorescence receiving system are coaxial in the described optical pickup system, and axis is respectively O
1O
2O
3O
4And O
4O
3O
2O
5, scanning system rotating shaft and fluorescence excitation system axis O
1O
2Overlap, 9 one-tenth semi-cylindrical shapeds of image plate are around scanning system, and as shown in Figure 2, the arc surface that image plate 9 surfaces are surrounded just overlaps with the arc surface that the focus rotation of scanning lens 8 forms, as shown in Figure 3.
In the system, the exciting light that exciting light source 1 sends is at first through first narrow band pass filter 2, and wavelength such as λ are passed through in 2 permissions of the optical filter effectively light wave of the single wavelength of fluorescence excitation
1This light wave arrives beam-expanding collimation system 3, behind beam-expanding collimation, become spot diameter bigger be parallel to main shaft O
1O
2O
3Collimated light arrive spectroscope 4.Wherein spectroscope 4 only allows to have wavelength X from exciting light source 1
1Light beam pass through, it is opaque to the transmitted light of other wavelength.What see through spectroscope 4 is parallel to main shaft O
1O
2O
3Exciting light continue to propagate, arrive scanning mirror 5, turning back through scanning mirror 5 enters scan arm 7 after 90 °, becomes to be parallel to optical axis O
3O
4Directional light, arrive scanning lens 8 at last, vertical irradiation was to image plate 9 after scanning lens 8 was focused to the micron order hot spot with collimate in parallel light, it is λ that image plate 9 is subjected to wavelength
1Excitation produce photoluminescence, send fluorescence, wavelength such as λ
2In this course, 5 rotations of scan module 6 gated sweep mirrors realize the scanning of exciting light to the image plate.
It is λ that the image plate 9 that is subjected to exciting light excitation is launched wavelength
2Fluorescence, fluorescence intensity is relevant with the fluorescent emission direction, as shown in Figure 6, the physical relationship formula is I=I
0Cos θ, I
0Be the fluorescence intensity along the 9 normal direction radiation of image plate, θ is the angle of emitted fluorescence and normal.By the fluorescence of image plate 9 surface emitting along O
4O
3Direction is propagated, and arrives scanning lens 8, and the wavelength that scanning lens 8 will be dispersed is λ
2Fluorescence be converged to approximate collimated light, continue along O
4O
3Direction propagates into scanning mirror 5, turns back after 90 ° along optical axis O through scanning mirror 5
3O
2Direction continues to propagate, and arrives the surface of spectroscope 4.Wherein spectroscope 4 only allows self imaging plate 9 to have wavelength X
2Fluorescent light beam reflection, reflecting surface is unreflecting to the light of other wavelength.Through the fluorescence of spectroscope 4 reflection along O
2O
5Direction is propagated, and arrives phosphor collection lens 14, and phosphor collection lens 14 are assembled collimated light, and it is λ to wavelength that focused light spot arrives 10 of second optical filter, 10, the second optical filters
2Fluorescence transparent, the fluorescence that sees through converges on the light-sensitive surface of photodetector 11, photodetector 11 is converted to the fluorescence light intensity photocurrent of respective strengths according to linear relationship, change the voltage signal of respective strengths again into, become digital signal through data acquisition system (DAS) 12 and send into storage and the demonstration of carrying out data in the computing machine 13, finish reading of some latent images on the image plate.
In order to finish, need exciting light is scanned along whole image plate to the reading of whole image plate latent image.When scan module 6 drives scanning mirror 5, scan arm 7 and scanning lens 8 around axle O
3O
2When at the uniform velocity rotating, when exciting light when the circular arc scanning direction is equipped with the half cycle of image plate 9, focus on the exciting light λ on the image plate 9
1 Image plate 9 along the circular arc scanning direction, shown in Fig. 2 photoscanning direction, is read the latent image information in the image plate, finish reading of delegation's signal, in the described process, film trasport motor 15 does not rotate, and the image plate is static; When exciting light when the circular arc scanning direction is not adorned the half cycle of image plate 9, film trasport motor 15 drives film trasport rollers 16 and rotates, and relies on friction force to drive image plate 9 along axle O
2O
3Direction stops after moving horizontally certain intervals, finishes moving axially of image plate 9, and described process is not carried out reading of latent image, when light to be excited forwards the half cycle that image plate 9 is housed to, repeat said process, finish reading of other delegation signal, so circulation is up to image plate 9 edge axle O
2O
3Direction is finished reading of whole image plate latent image all by the scanning of exciting light.
In described Fig. 3 system, scanning mirror 5 can be pentagonal prism, also can be plane mirror, as long as play the direction to 90 ° of exciting light and the equal deflections of fluorescence.
Described spectroscope 4 has property, as shown in Figure 5, can separate wavelengths be λ
1Exciting light and wavelength be λ
2Fluorescence, the light that makes two kinds of different wave lengths is along different propagated.Exciting light is seen through, make the excited fluorescent reflection, shown in Fig. 5 a; Also can be that excited fluorescent is seen through, the exciting light reflection be shown in Fig. 5 b.
In described Fig. 3 system,, only allow self imaging plate 9 to have wavelength X if the characteristic of spectroscope 4 changes
2The fluorescent light beam transmission, to having wavelength X
1Excitation beam reflection, shown in Fig. 5 b, then the described system of Fig. 3 will develop into the described system of Fig. 4, but ultimate principle is the same with Fig. 3 system with scanning process.
Described exciting light source can be any in laser, light emitting diode, other monochromatic source.
Described scanning lens can be the optical component that complex lens such as simple lenses such as biconvex lens, plano-convex lens, concave-convex lens, achromat or cemented doublet, three balsaming lenss, non-spherical lens or lens combination etc. have the characteristic of converging.
Described scanning mirror can be any of prism, level crossing, spherical mirror, aspheric mirror.
Described colimated light system can be the system that simple lens, lens combination, catoptron etc. can make the light collimation.
Described photodetector can be any in photomultiplier, photon counter, avalanche diode, the silicon photocell.
Claims (2)
1. reading-out device of X-ray imaging system of computer is characterized in that:
This device is made of fluorescence excitation system, fluorescence receiving system and scanning system,
The fluorescence excitation system: by exciting light source, first optical filter, beam-expanding collimation system, spectroscope, scanning mirror, scan arm, scanning lens and image plate are formed, and exciting light source, first optical filter, beam-expanding collimation system, spectroscope are sequentially arranged in optical axis O
1O
2On, spectroscope, scanning mirror are sequentially arranged in optical axis O
2O
3On, scanning mirror, scan arm, scanning lens are sequentially arranged in optical axis O
3O
4On, excitation beam is through 90 ° of scanning mirror refractions, optical axis O
1O
2With optical axis O
2O
3On same optical axis, and with optical axis O
3O
4Vertically, the vertical image plate of excitation beam incident;
The fluorescence receiving system: be made up of described scanning lens, described scan arm, described scanning mirror, described spectroscope, phosphor collection lens, second optical filter, photodetector and data acquisition system (DAS), spectroscope, phosphor collection lens, second optical filter, photodetector are sequentially arranged in same optical axis O
2O
5On, optical axis O
3O
4With optical axis O
2O
5Parallel, optical axis O
2O
5With optical axis O
1O
2Or optical axis O
2O
3Vertically;
Scanning system: constitute by scan module, described scanning mirror, described scan arm, described scanning lens, film trasport motor and several film trasport rollers;
Data acquisition system (DAS), exciting light source, scan module and film trasport motor are connected with computing machine;
Wherein:
The image plate becomes semi-cylindrical shaped around scanning system, and the arc surface that image plate photosensitive surface is surrounded just overlaps with the arc surface that the focus rotation of scanning lens forms;
Spectroscopical optical axis and optical axis O
1O
2Angle is 45 °;
Described exciting light source is any in LASER Light Source, light emitting diode, other monochromatic source;
Described scanning mirror is any in prism, level crossing or the spherical mirror;
Described scanning lens is the optical component with the characteristic of converging, be any of simple lens, complex lens or lens combination, described simple lens is biconvex lens, plano-convex lens, concave-convex lens or non-spherical lens, and described complex lens is cemented doublet, three balsaming lenss or achromat;
Described colimated light system is the system that makes light collimation, is any in simple lens, lens combination, the catoptron;
Described photodetector is any in photomultiplier, photon counter, avalanche diode, the silicon photocell.
2. reading-out device of X-ray imaging system of computer is characterized in that:
This device is made of fluorescence excitation system, fluorescence receiving system and scanning system,
The fluorescence excitation system: by exciting light source, first optical filter, beam-expanding collimation system, spectroscope, scanning mirror, scan arm, scanning lens and image plate are formed, and exciting light source, first optical filter, beam-expanding collimation system, spectroscope are sequentially arranged in optical axis O
1O
2On, spectroscope, scanning mirror are sequentially arranged in optical axis O
2O
3On, scanning mirror, scan arm, scanning lens are sequentially arranged in optical axis O
3O
4On, optical axis O
1O
2With optical axis O
2O
3Intersect vertically, excitation beam is through 90 ° of scanning mirror refractions, vertically image plate incident;
The fluorescence receiving system: be made up of described scanning lens, described scan arm, described scanning mirror, described spectroscope, phosphor collection lens, second optical filter, photodetector and data acquisition system (DAS), spectroscope, phosphor collection lens, second optical filter, photodetector are sequentially arranged in same optical axis O
2O
5On, optical axis O
2O
3With optical axis O
2O
5Coaxial, optical axis O
2O
5With optical axis O
1O
2Or optical axis O
3O
4Vertically;
Scanning system: constitute by scan module, described scanning mirror, described scan arm, described scanning lens, film trasport motor and several film trasport rollers;
Data acquisition system (DAS), exciting light source, scan module and film trasport motor are connected with computing machine;
Wherein:
The image plate becomes semi-cylindrical shaped around scanning system, and the arc surface that image plate photosensitive surface is surrounded just overlaps with the arc surface that the focus rotation of scanning lens forms;
Spectroscopical optical axis and optical axis O
1O
2Angle is 45 °;
Described exciting light source is any in LASER Light Source, light emitting diode, other monochromatic source;
Described scanning mirror is any in prism, level crossing or the spherical mirror;
Described scanning lens is the optical component with the characteristic of converging, be any of simple lens, complex lens or lens combination, described simple lens is biconvex lens, plano-convex lens, concave-convex lens or non-spherical lens, and described complex lens is cemented doublet, three balsaming lenss or achromat;
Described colimated light system is the system that makes light collimation, is any in simple lens, lens combination, the catoptron;
Described photodetector is any in photomultiplier, photon counter, avalanche diode, the silicon photocell.
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| CN101718912B (en) * | 2009-11-27 | 2011-05-18 | 北京工业大学 | Digitalized detail visualizer of industrial X-ray negative with variable zooming ratio |
| CN105391954B (en) * | 2015-12-01 | 2019-01-08 | 天逸瑞狮（苏州）口腔医疗科技股份有限公司 | A kind of image-scanning system and image scanning module |
| CN105763817B (en) * | 2016-03-14 | 2020-01-14 | 天逸瑞狮（苏州）口腔医疗科技股份有限公司 | Image scanning system |
| JP6837776B2 (en) * | 2016-08-10 | 2021-03-03 | 株式会社小糸製作所 | Vehicle headlights |
| CN106353289A (en) * | 2016-09-19 | 2017-01-25 | 苏州微析生物科技有限公司 | Light path system of POCT fluorescent quantitative analyser and fluorescent quantitative analysis method |
| CN107589541B (en) * | 2017-09-30 | 2024-02-23 | 天逸瑞狮（苏州）口腔医疗科技股份有限公司 | Image scanning system and laser beam module thereof |
| CN110477874A (en) * | 2019-09-25 | 2019-11-22 | 天逸瑞狮（苏州）口腔医疗科技股份有限公司 | Image scanner in a kind of mouth |
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