CN109782562A - It is a kind of to calculate holographic CT-3D Reconstruction holographic imaging system based on Fresnel - Google Patents
It is a kind of to calculate holographic CT-3D Reconstruction holographic imaging system based on Fresnel Download PDFInfo
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- CN109782562A CN109782562A CN201910195453.7A CN201910195453A CN109782562A CN 109782562 A CN109782562 A CN 109782562A CN 201910195453 A CN201910195453 A CN 201910195453A CN 109782562 A CN109782562 A CN 109782562A
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Abstract
Holographic CT-3D Reconstruction holographic imaging system is calculated based on Fresnel the invention discloses a kind of, including laser and catching device, attenuator is also disposed between the laser and catching device, beam expanding lens, collimating mirror, LCD space light modulator and lens, the LCD space light modulator is connect with computer, the computer is according to the cone-beam CT reconstruction algorithm write, 3-D image is rebuild by artificial projections data or true CT data for projection, three-dimensional digital image is imported and generates Fresnel computed hologram program by the computer, it is loaded on the LCD space light modulator being attached thereto, the practical CT scan part, X-ray passes through detecting object and is received by detector plane, obtain data for projection.This calculates holographic CT-3D Reconstruction holographic imaging system based on Fresnel, and the physical process of production is simple and easy, and can synthesize the preferable three-dimensional image of quality, is easy to be widely applied.
Description
Technical field
The invention belongs to hologram technical fields, and in particular to a kind of that holographic CT-3D Reconstruction is calculated based on Fresnel
Holographic imaging system.
Background technique
CT rebuilds clinical diagnosis medically and industrial nondestructive testing has a wide range of applications, it is desirable that high quality graphic and
Accurate target information carries out three-dimensional reconstruction and visualization using Computer Simulation, is not 3-D image truly,
Because the three-dimensional CT image obtained in this way is still to show on two-dimensional surface, precisely, only 3-D image is in two-dimensional surface
On projection, actually eye-observation to be still two dimensional image, so being unable to get all information of three-dimension object and up to not
To the visual effect of naked eye 3D.
A kind of method that optical means makes hologram and optical reproduction is proposed in patent CN1213097A, by this
Although method can obtain real 3-d reproduction picture, optical holographic manufacturing process is extremely complex, the requirement pole to environment
Height, image quality is not high, moreover, this method is suitable only for the three-dimensional reconstruction of the CT picture of the film forms of black and white, is not suitable for
In the CT image of digital image form generally used now, be not suitable for colored CT image yet, therefore, it is necessary to develop it is simple flexibly,
The high reconstruction of hologram system of image quality.
Summary of the invention
Holographic CT-3D Reconstruction holographic imaging system is calculated based on Fresnel the purpose of the present invention is to provide a kind of, with
Solve the problems mentioned above in the background art.
To achieve the above object, the invention provides the following technical scheme: a kind of calculate holographic three dimensional CT based on Fresnel
Holographic imaging system, including laser and catching device are rebuild, is also disposed between the laser and catching device
Attenuator, beam expanding lens, collimating mirror, LCD space light modulator and lens, the LCD space light modulator are connect with computer,
The computer rebuilds three-dimensional figure according to the cone-beam CT reconstruction algorithm write, by artificial projections data or true CT data for projection
Picture；
Three-dimensional digital image is imported and generates Fresnel computed hologram program by the computer, is loaded into and is attached thereto
On LCD space light modulator；
The light that the x-ray source issues passes through detecting object and is radiated on detector plane.
Preferably, the light beam that laser issues is modulated by the LCD space light modulator.
Preferably, the light beam that the laser issues passes through attenuator, beam expanding lens, collimating mirror and reaches liquid crystal spatial light modulation
Device is modulated.
Preferably, the catching device accepts the light source of LCD space light modulator switching, and the light source is in liquid crystal spatial
Lens are also extended through between optical modulator and catching device.
Preferably, the catching device can also be the spatial depth for utilizing the scattering process of fog particle to enhance 3D image
The mist screen of sense.
Preferably, the computer simulation 3-D image or practical CT scan data, write what GPU accelerated parallel respectively
The LISP program LISP of FDK and ART algorithm generates the reconstruction three-dimensional digital image of object, and stores in a computer.
Preferably, shown catching device side is additionally provided with viewing area.
Preferably, wherein only the Fresnel computed hologram recording distance that issues of the LCD space light modulator with
When reproduction on the catching device is equidistant, it could obtain clearly in phenomenon.
Technical effect and advantage of the invention: should calculate holographic CT-3D Reconstruction holographic imaging system based on Fresnel,
It realizes that the optical holographic in the generation and real world of the Fresnel computed hologram of three-dimensional digital image reproduces on computer, changes
Be apt to the image quality of traditional optical holography, and improved flexibility and simplicity, based on GPU accelerate real time image reconstruction,
Calculating hologram three-dimensional, which is shown, does not need to wear special viewing equipment, and the effect of naked eye 3D can be realized, and calculates holography to production
Environment not harsh requirement, extension system make three primary colors CGH and synthesize color three dimensional image, and computing holography avoids holography
The limitation of physical record optical path can carry out hologram calculating to the three-dimensional data or model that any means obtain, have flexibly, again
Renaturation well equal spies, can extension system production three primary colors CGH synthesize color three dimensional image, holographic three-dimensional should be calculated based on Fresnel
CT rebuilds holographic imaging system, and the physical process of production is simple and easy, and can synthesize the preferable three-dimensional image of quality, is easy to
It is widely applied.
Detailed description of the invention
Fig. 1 is structural block diagram of the invention；
Fig. 2 is the structural block diagram of 3 D pyramidal CT scanning system of the invention；
Fig. 3 is workflow structure block diagram of the invention.
In figure: dress is accepted in 1 laser, 2 attenuators, 3 beam expanding lens, 4 collimating mirrors, 5 LCD space light modulators, 6 lens, 7
It sets, 8 computers, 9 viewing areas, 10X radiographic source, 11 detecting objects, 12 detector planes.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The present invention provides a kind of CT-3D Reconstruction hologram systems that holography is calculated based on Fresnel as shown in Figs. 1-3
System, including laser 1 and catching device 7 are also disposed with attenuator 2, expand between the laser 1 and catching device 7
Beam mirror 3, collimating mirror 4, LCD space light modulator 5 and lens 6, the LCD space light modulator 5 are connect with computer 8, institute
Computer 8 is stated according to the cone-beam CT reconstruction algorithm write, rebuilds three-dimensional figure by artificial projections data or true CT data for projection
Picture；
Three-dimensional digital image is imported and generates Fresnel computed hologram program by the computer 8, is loaded into and is attached thereto
LCD space light modulator 5 on；
The light that the x-ray source 10 issues passes through detecting object 11 and is radiated on detector plane 12.
Specifically, the light beam that laser 1 issues is modulated by the LCD space light modulator 5.
Specifically, the light beam that the laser 1 issues, which passes through attenuator 2, beam expanding lens 3, collimating mirror 4, reaches liquid crystal spatial light
Modulator 5 is modulated.
Specifically, the catching device 7 accepts the light source that LCD space light modulator 5 is transferred, the light source is in liquid crystal sky
Between lens 6 are also extended through between optical modulator 5 and catching device 7.
Specifically, the catching device 7 can also be deep to enhance the space of 3D image using the scattering process of fog particle
Spend the mist screen of sense.
Specifically, 8 stimulated three-dimensional image of computer or practical CT scan data, write what GPU accelerated parallel respectively
The LISP program LISP of FDK and ART algorithm, generates the reconstruction three-dimensional digital image of object, and is stored in computer 8, LISP program LISP
For C/C++ LISP program LISP.
Specifically, shown 7 side of catching device is additionally provided with viewing area 9.
Specifically, wherein only the Fresnel computed hologram recording distance that issues of the LCD space light modulator 5 with
When reproduction on the catching device 7 is equidistant, it could obtain clearly in phenomenon.
Specifically, holographic CT-3D Reconstruction holographic imaging system should be calculated based on Fresnel, it is former according to CT tomographic imaging
Reason, for the analytic reconstruction and iterative reconstruction approach of cone beam reconstruction, is swept by 8 stimulated three-dimensional image of computer or practical CT
Data are retouched, write the C/C++ LISP program LISP for the FDK and ART algorithm that GPU accelerates parallel respectively, generate three dimension of reconstruction of object
Word image, and be stored in computer 8.Next it according to the theory of the Fresnel computed hologram (CGH) of three-dimension object, writes
By the program of digital image generation CGH, method particularly includes: chromatography is utilized, passes through Fourier transformation and calculates three under specified parameter
The fresnel diffraction field distribution of each slice of dimension word image is superimposed the complex amplitude information of all slices of three-dimension object, result
The COMPLEX AMPLITUDE of holographic facet is calculated for three-dimension object, then optical field distribution is encoded, to obtain the Fei Nie of three-dimension object
You calculate holography, finally build the photoelectric reproduction system of hologram comprising laser 1, attenuator 2, beam expanding lens 3, collimation
Mirror 4, lens 6 several, spatial light modulator 5, computer 8, the three-dimensional data that reconstruction is obtained imports write Program Generating
The CGH of gained reconstruction image is imported spatial light modulator 5 by computer, is finally accepted with catching device and realize photoelectricity by CGH
It reproduces.
Finally, it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not intended to restrict the invention,
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features,
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (8)
1. a kind of calculate holographic CT-3D Reconstruction holographic imaging system, including laser (1) and undertaking dress based on Fresnel
It sets (7), attenuator (2), beam expanding lens (3), collimating mirror is also disposed between the laser (1) and catching device (7)
(4), LCD space light modulator (5) and lens (6), it is characterised in that: the LCD space light modulator (5) and computer
(8) it connects, the computer (8) projects number according to the cone-beam CT reconstruction algorithm write, by artificial projections data or true CT
According to reconstruction 3-D image；
Three-dimensional digital image is imported and generates Fresnel computed hologram program by the computer (8), is loaded into and is attached thereto
On LCD space light modulator (5)；
The x-ray source (10) passes through detecting object (11) and is radiated on detector plane (12).
2. a kind of CT-3D Reconstruction holographic imaging system for calculating holography based on Fresnel according to claim 1, special
Sign is: the light beam that laser (1) issues is modulated by the LCD space light modulator (5).
3. a kind of CT-3D Reconstruction holographic imaging system for calculating holography based on Fresnel according to claim 1, special
Sign is: the light beam that the laser (1) issues passes through attenuator (2), beam expanding lens (3), collimating mirror (4) arrival liquid crystal spatial light
Modulator (5) is modulated.
4. a kind of CT-3D Reconstruction holographic imaging system for calculating holography based on Fresnel according to claim 1, special
Sign is: the catching device (7) accepts the light source of LCD space light modulator (5) switching, and the light source is in liquid crystal spatial light
Lens (6) are also extended through between modulator (5) and catching device (7).
5. a kind of CT-3D Reconstruction holographic imaging system for calculating holography based on Fresnel according to claim 1, special
Sign is: the catching device (7) can also be the spatial depth sense for utilizing the scattering process of fog particle to enhance 3D image
Mist screen.
6. a kind of CT-3D Reconstruction holographic imaging system for calculating holography based on Fresnel according to claim 1, special
Sign is: computer (8) stimulated three-dimensional image or practical CT scan data, write respectively FDK that GPU accelerates parallel and
The LISP program LISP of ART algorithm, generates the reconstruction three-dimensional digital image of object, and is stored in computer (8).
7. a kind of CT-3D Reconstruction holographic imaging system for calculating holography based on Fresnel according to claim 1, special
Sign is: shown catching device (7) side is additionally provided with viewing area (9).
8. a kind of CT-3D Reconstruction holographic imaging system for calculating holography based on Fresnel according to claim 1, special
Sign is: where the Fresnel computed hologram recording distance that the only described LCD space light modulator (5) issues is held with described
When reproduction on connection device (7) is equidistant, it could obtain clearly in phenomenon.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110286575A (en) * | 2019-07-19 | 2019-09-27 | 深圳市金质金银珠宝检验研究中心有限公司 | The implementation method of full color volume holographic anti-counterfeiting technology based on DMD |
| CN113917819A (en) * | 2021-10-13 | 2022-01-11 | 中国工程物理研究院激光聚变研究中心 | Incoherent three-dimensional holographic layered reconstruction method based on Fresnel mask |
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| CN110286575A (en) * | 2019-07-19 | 2019-09-27 | 深圳市金质金银珠宝检验研究中心有限公司 | The implementation method of full color volume holographic anti-counterfeiting technology based on DMD |
| CN113917819A (en) * | 2021-10-13 | 2022-01-11 | 中国工程物理研究院激光聚变研究中心 | Incoherent three-dimensional holographic layered reconstruction method based on Fresnel mask |
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Application publication date: 20190521 |