CN104095646B - The bispin CT imaging system of high-resolution and high s/n ratio and imaging method - Google Patents
The bispin CT imaging system of high-resolution and high s/n ratio and imaging method Download PDFInfo
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- CN104095646B CN104095646B CN201310116386.8A CN201310116386A CN104095646B CN 104095646 B CN104095646 B CN 104095646B CN 201310116386 A CN201310116386 A CN 201310116386A CN 104095646 B CN104095646 B CN 104095646B
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Abstract
The present invention provides bispin CT imaging system and the imaging method of a kind of high-resolution and high s/n ratio, and described imaging system includes：X-ray or neutron line source：For producing the light beam of irradiating sample；Sample stage：For carrying, fix and rotary sample；Line pixel detector array：For the background of light intensity and the change of locus is detected, data for projection of the sample under the light beam irradiates is gathered；Whirligig：For perpendicular to the direction of sample rotating shaft, around sample synchronous rotary line source and line pixel detector array.Above-mentioned imaging system has the characteristics that imaging resolution height, projection data signal are strong, meets the application demand of the aspects such as medical science detection, safety inspection, industrial detection.
Description
Technical field
The present invention relates to X-ray or neutron imaging technical field, more particularly to a kind of high-resolution and high s/n ratio
Bispin CT imaging system and imaging method.
Background technology
Roentgen was found that X-ray in 1895, and won first Nobel Prize in physics on December 10th, 1901.Extensively
The X-ray photographs of the roentgen madam's hand for spreading discloses X-ray and has powerful penetration power, just shows X-ray direct imaging
The internal structure of sample can be seen.The projection imaging mechanism of this x-ray bombardment sample is extensively used in last century the fifties
It is imaged in human medical, and starts to be imaged for human body three-dimensional in last century the eighties.However, very widely used today X is penetrated
Line projection's imaging method, including radioscopy and X ray CT, with an obvious shortcoming：Source diameter is less, resolution ratio
Higher, but source diameter is less, and luminous flux is less, and signal to noise ratio is lower, and imaging time is longer.Thus be imaged in x-ray projection
Field, has contradiction between resolution ratio and luminous flux always, the x-ray imaging equipment for the purpose of pursuing high-resolution imaging
Designer has to obtain high-resolution as cost to sacrifice signal to noise ratio, and the X for the purpose of realizing high-volume quick detection
Radiation imaging apparatus designer has to obtain high s/n ratio to sacrifice resolution ratio.
Content of the invention
The brief overview being given below with regard to the present invention, to provide the basic reason with regard to certain aspects of the invention
Solution.It should be appreciated that this general introduction is not the exhaustive general introduction with regard to the present invention.It is not intended to determine the key of the present invention
Or pith, nor is it intended to limit the scope of the present invention.Its purpose only provides some concepts in simplified form, with
This is used as the preamble in greater detail that discusses after a while.
It is an object of the present invention to provide a kind of 3-D imaging system that can realize high-resolution and high s/n ratio.
It is a further object of the present invention to provide a kind of three-D imaging method that can realize high-resolution and high s/n ratio.
For achieving the above object, the invention provides the bispin CT imaging system of a kind of high-resolution and high s/n ratio, bag
Include：
For producing the X-ray of irradiating sample or the line source of neutron light；
For carrying, the sample stage of fixing and rotary sample；
For perpendicular to line pixel orientation, detecting the line pixel detector array of light intensity spatial position change, collection
The data for projection of the corresponding sample of different rotary angle in predetermined rotation angle range, line pixel is parallel to line source；
For carrying the whirligig of line source and line pixel detector array, can be visited with line source center and line pixel
Ce Qi array center line is axle, perpendicular to the direction of sample rotating shaft, visits around sample synchronous rotary line source and line pixel
Survey device array.
For achieving the above object, the present invention also provides the bispin CT imaging method of a kind of high-resolution and high s/n ratio, bag
Include following steps：
Adjustment line source, the light beam irradiating sample for producing the light source；
Adjustment sample stage, makes sample stage rotating shaft be located on line source center and line pixel detector array center line, and
Perpendicular to the line；
Adjustment line pixel detector array, makes line pixel parallel with line source；
Adjustment whirligig, enables line source and line pixel detector array with line source center and line pixel detector
Array center's line is axle, perpendicular to the direction of sample rotating shaft, around sample synchronous rotary；
The data for projection of line pixel detector array acquisition sample, makes the rotary sample, and makes line source and line pixel
Detector array is rotated with line source center and line pixel detector array center line as axle, by line pixel detector array
Gather the data for projection of the sample in predetermined rotation angle range；
The two and three dimensions image of sample is rebuild, using optical signal and the CT reconstruction side of line pixel detector array acquisition
Method, rebuilds the high-resolution two and three dimensions image of sample.
The invention has the advantages that：
The contradiction between the resolution ratio of permanent puzzlement people and signal to noise ratio in x-ray projection imaging field is solved, is profit
The image of the high-resolution and high s/n ratio that obtain sample with common X-ray source and middle sub-light source is laid a good foundation.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Accompanying drawing to be used needed for technology description is had to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, acceptable
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the bispin CT imaging system structural representation of high-resolution proposed by the present invention and high s/n ratio, wherein, line
Light source and line pixel detector array parallel, whirligig is with line source center and line pixel detector array center line as axle
Synchronous rotary line source and line pixel detector array.
Reference：1- line source；2- sample stage；3- line pixel detector array；4- whirligig.
Specific embodiment
Purpose, technical scheme and advantage for making the embodiment of the present invention is clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
The a part of embodiment of the present invention, rather than whole embodiments.Described in the accompanying drawing of the present invention or a kind of embodiment
Element and feature can combine with the element illustrated in other accompanying drawings one or more or embodiment and feature.Should
Note, for purposes of clarity, eliminate in accompanying drawing and explanation unrelated to the invention, known to persons of ordinary skill in the art
Part and the expression for processing and description.Based on the embodiment in the present invention, those of ordinary skill in the art are not paying creation
Property work on the premise of the every other embodiment that obtained, belong to the scope of protection of the invention.
The invention provides the bispin CT imaging system of a kind of high-resolution and high s/n ratio, including：
For producing the X-ray of irradiating sample or the line source of neutron light；
For carrying, the sample stage of fixing and rotary sample；
For perpendicular to line pixel orientation, detecting the line pixel detector array of light intensity spatial position change, collection
The data for projection of the corresponding sample of different rotary angle in predetermined rotation angle range, line pixel is parallel to line source；
For carrying the whirligig of line source and line pixel detector array, can be visited with line source center and line pixel
Ce Qi array center line is axle, perpendicular to the direction of sample rotating shaft, visits around sample synchronous rotary line source and line pixel
Survey device array.
The present invention also provides the bispin CT imaging method of a kind of high-resolution and high s/n ratio, comprises the following steps：
Adjustment line source, the light beam irradiating sample for producing the light source；
Adjustment sample stage, makes sample stage rotating shaft be located on line source center and line pixel detector array center line, and
Perpendicular to the line；
Adjustment line pixel detector array, makes line pixel parallel with line source；
Adjustment whirligig, enables line source and line pixel detector array with line source center and line pixel detector
Array center's line is axle, perpendicular to the direction of sample rotating shaft, around sample synchronous rotary；
The data for projection of line pixel detector array acquisition sample, makes the rotary sample, and makes line source and line pixel
Detector array is rotated with line source center and line pixel detector array center line as axle, by line pixel detector array
Gather the data for projection of the sample in predetermined rotation angle range；
The two and three dimensions image of sample is rebuild, using optical signal and the CT reconstruction side of line pixel detector array acquisition
Method, rebuilds the high-resolution two and three dimensions image of sample.
The present invention solves the lance in x-ray projection imaging field between the resolution ratio of permanent puzzlement people and signal to noise ratio
Shield, its general principle is：Perpendicular to the direction of line source, the one-dimensional high-resolution signal of two-dimentional sample is obtained, parallel
High s/n ratio is obtained in the direction of line source using the light-emitting area of extension, recycle rotation line source and line pixel detector battle array
Row obtain the signal of two-dimentional sample one-dimensional high-resolution in all directions and high s/n ratio, then using CT method for reconstructing weight
Build the high-resolution two-dimensional image of sample.In short, in two mutually perpendicular directions, realizing high-resolution and high noise respectively
Than obtaining the two-dimentional two-dimentional high-resolution of sample and the image of high s/n ratio by rotating.
The two-dimensional imaging method of above-mentioned high-resolution and high s/n ratio can be generalized to three-dimensional imaging, be made using rotary sample
Line pixel detector array acquisition sample two-dimentional high-resolution in all directions and the image of high s/n ratio, secondary utilization CT
Method for reconstructing rebuilds the high-resolution three-dimension image of sample.
In the various embodiments described above of the present invention, the sequence number of embodiment and/or sequencing are merely convenient of description, do not represent reality
Apply the quality of example.Description to each embodiment all emphasizes particularly on different fields, and does not have the part that describes in detail, may refer to which in certain embodiment
The associated description of his embodiment.
One of ordinary skill in the art will appreciate that：The all or part of step for realizing said method embodiment can pass through
Completing, aforesaid program can be stored in a computer read/write memory medium the related hardware of programmed instruction, the program
Upon execution, the step of including said method embodiment is executed；And aforesaid storage medium includes：Read-only storage（Read-
Only Memory, abbreviation ROM）, random access memory（Random Access Memory, abbreviation RAM）, magnetic disc or light
Disk etc. is various can be with the medium of store program codes.
In the embodiments such as apparatus and method of the present invention, it is clear that each part or each step be can decompose, combine and/
Or reconfigure after decomposing.These decompose and/or reconfigure the equivalents that should be regarded as the present invention.Meanwhile, right above
In the description of the specific embodiment of the invention, the feature for describing for a kind of embodiment and/or illustrating can be with same or like
Mode used in one or more other embodiments, combined with the feature in other embodiment, or substitute which
Feature in its embodiment.
It should be emphasized that term "comprises/comprising" refers to the presence of feature, key element, step or component herein when using, but simultaneously
It is not excluded for the presence of one or more further features, key element, step or component or additional.
Finally it should be noted that：Although the present invention and its advantage is below described in detail it should be appreciated that not
Beyond can carry out in the case of the spirit and scope of the present invention that are defined by the claims appended hereto various changes, replacement and
Conversion.And, the scope of the present invention is not limited only to the concrete reality of the process described by specification, equipment, means, method and steps
Apply example.One of ordinary skilled in the art will readily appreciate that from the disclosure, can be used according to the present invention and hold
The row function essentially identical to corresponding embodiment described herein obtains result, the existing and future essentially identical with which
Process to be developed, equipment, means, method or step.Therefore, appended claim is directed at wrapping in the range of them
Include such process, equipment, means, method or step.
Claims (4)
1. the bispin CT imaging system of a kind of high-resolution and high s/n ratio, it is characterised in that include：
Line source, for producing X-ray or the neutron light of irradiating sample, is adjusted to picture by adjusting the diameter of the line source
Resolution ratio；
Sample stage, for carrying, fixes and rotary sample；
Line pixel detector array, parallel to line source, for perpendicular to the direction of line pixel, detecting the space bit of light intensity
The change that puts, gathers the data for projection of the corresponding sample of different rotary angle in predetermined rotation angle range；The sample stage and
The line pixel detector array is additionally operable to obtain high s/n ratio in the direction parallel to line source using the light-emitting area of extension；
Whirligig, for carrying line source and line pixel detector array, can be with line source center and line pixel detector
Array center's line is axle, perpendicular to the direction of sample rotating shaft, around sample synchronous rotary line source and line pixel detector
Array.
2. the bispin CT imaging system of high-resolution according to claim 1 and high s/n ratio, it is characterised in that the sample
Sample platform can be with respect to line source and line pixel detector array rotation, and the line source and line pixel detector array can be surrounded
Sample stage rotates, and two kinds of rotary shafts are orthogonal.
3. the bispin CT imaging method of a kind of high-resolution and high s/n ratio, it is characterised in that include：
Adjustment line source, the light beam irradiating sample for producing the line source, is improved into by adjusting the diameter of the line source
As resolution ratio；
Adjustment sample stage, makes sample stage rotating shaft be located on line source center and line pixel detector array center line, and vertically
In the line；
Adjustment line pixel detector array, makes line pixel parallel with line source, and in the direction parallel to line source using extension
Light-emitting area obtain high s/n ratio；
Adjustment whirligig, enables line source and line pixel detector array with line source center and line pixel detector array
The line of centres is axle, perpendicular to the direction of sample rotating shaft, around sample synchronous rotary；
Sample one-dimensional high-resolution in all directions and high letter are obtained using rotation line source and line pixel detector array
Make an uproar than signal, then using CT method for reconstructing rebuild sample high-resolution two-dimensional image；
Line pixel detector array acquisition sample two-dimentional high-resolution in all directions and high noise are made using rotary sample
The image of ratio, secondary utilization CT method for reconstructing rebuild the high-resolution three-dimension image of sample.
4. the bispin CT imaging method of high-resolution according to claim 3 and high s/n ratio, it is characterised in that sample stage
With line source and line pixel detector array with orthogonal two rotary shaft synchronous rotaries, the rotating speed of two kinds of rotations is by CT weight
The projection number decision of collection needed for building, if the projection number of collection is N needed for CT reconstruction, then sample stage rotates 1 circle, line source and line
Pixel detector array needs to enclose around rotary sample N.
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| CN104634797A (en) * | 2015-02-12 | 2015-05-20 | 重庆大学 | Sector-shaped plane/cone beam CT multi-turntable synchronous scanning device and method |
| CN105161147B (en) * | 2015-07-21 | 2018-01-19 | 中国原子能科学研究院 | A kind of presurized water reactor spent fuel element three-dimensional neutron photography lossless detection method |
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| EP1879020A1 (en) * | 2006-07-12 | 2008-01-16 | Paul Scherrer Institut | X-ray interferometer for phase contrast imaging |
| CN201191275Y (en) * | 2007-11-23 | 2009-02-04 | 同方威视技术股份有限公司 | X ray grating contrast image-forming system |
| US7949095B2 (en) * | 2009-03-02 | 2011-05-24 | University Of Rochester | Methods and apparatus for differential phase-contrast fan beam CT, cone-beam CT and hybrid cone-beam CT |
| JP5269041B2 (en) * | 2009-12-04 | 2013-08-21 | キヤノン株式会社 | X-ray imaging apparatus and X-ray imaging method |
| JP2012093429A (en) * | 2010-10-25 | 2012-05-17 | Fujifilm Corp | Grid for radiation imaging, method of manufacturing the same, and radiation imaging system |
| US9066704B2 (en) * | 2011-03-14 | 2015-06-30 | Canon Kabushiki Kaisha | X-ray imaging apparatus |
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