CN104323787B - X-ray tomography method and X-ray tomography system - Google Patents
X-ray tomography method and X-ray tomography system Download PDFInfo
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Abstract
The invention provides an X-ray tomography method, which comprises the following steps: by controlling voltage between the cathode and the grid of a field emission unit of a multi-focal spot X-ray source, controlling the multi-focal spot X-ray source to emit X-rays to a detected object from different emission source positions to perform scanning; receiving the X-rays transmitting the detected object by utilizing a flat panel detector to obtain X-ray projected images at multiple angles; collecting data of the X-ray projected images, and performing reconstruction on the collected data to obtain the faulted image of the detected object. By adopting the method, not only can the spatial resolution be improved but also the scanning speed can be increased; moreover, the invention also provides an X-ray tomography system.
Description
Technical field
The present invention relates to x-ray layer scanning technology field, more particularly to a kind of x-ray tomography method and be
System.
Background technology
Breast cancer is one of most common disease of dangerous women's health, and molybdenum target piece x-ray inspection is current breast cancer early stage
The conventional meanses of examination.Due to molybdenum target piece x-ray inspection acquisition is overlapping two dimensional image, lacks the letter of depth direction
Breath, leads to produce more false positive or false negative.X-ray tomoscan is as a kind of new imaging technique, it is possible to obtain three
The image information of dimension, effectively prevent the mistaken diagnosis that tissue overlap leads to.
Existing x-ray tomographic system, in order to carry out the x-ray scan of various visual angles, an x-ray tube is pacified
It is contained on a rotary frame, and make this x-ray tube along a default arcuate movement.X-ray tube is operated in interval
During motor pattern, can stop after the every new projected position of x-ray tube and carry out x line exposing, the follow-up reforwarding of end exposure
Move to next projected position.Acceleration due to x-ray tube can cause the unstable of machinery with deceleration, thus limiting x-ray
The movement velocity of pipe so that sweep time longer.If wanting to shorten sweep time, improving sweep speed, x-ray tube can be made to work
In continuous motor pattern.But, because sweep speed is higher, the distance that x-ray tube is moved in time for exposure window is bigger,
The focal spot blurred area thus causing is also bigger, so that the spatial resolution of scanning system reduces.If reducing scanning
Speed, can reduce focal spot blurred area, but longer sweep time easily causes movement of patient again, again results in the mould of image
Paste.Therefore, how to realize improving spatial resolution in x-ray layer scanning technology and can improve sweep speed again, become
Urgent problem at present.
Content of the invention
Based on this it is necessary to be directed to above-mentioned technical problem, provide one kind can improve spatial resolution and can improve scanning again
The x-ray tomography method of speed and system.
A kind of x-ray tomography method, methods described includes:
By controlling the voltage between the negative electrode of field emission unit of many focal spots x-ray source and grid, control described many focal spots x
Radiographic source is scanned to detected object transmitting x-ray from different emission source point positions；
Receive the x-ray through described detected object using flat panel detector, obtain the x-ray perspective view of multi-angle
Picture；
Gather the data of described x-ray projected image, and the data collecting is carried out reconstruction obtain described detected right
The faultage image of elephant.
A kind of x-ray tomographic system, described system includes:
Scan module, the voltage between the negative electrode for the field emission unit by controlling many focal spots x-ray source and grid, control
Make described many focal spots x-ray source to be scanned to detected object transmitting x-ray from different emission source point positions；
Image collection module, for receiving the x-ray through described detected object using flat panel detector, obtains polygonal
The x-ray projected image of degree；
Image-forming module, for gathering the data of described x-ray projected image, and carries out reconstruction to the data collecting and obtains
The faultage image of described detected object.
Above-mentioned x-ray tomography method and system, by control many focal spots x-ray source field emission unit negative electrode with
Voltage between grid, to control many focal spots x-ray source to be swept to detected object transmitting x-ray from different emission source point positions
Retouch, receive the x-ray through detected object using flat panel detector, obtain the x-ray projected image of multi-angle, collection x penetrates
The data of line projection's image, and the data collecting is carried out rebuilding the faultage image obtaining detected object.Due to using many
Focal spot x-ray source launches x-ray from different emission source point positions, eliminates due to the mechanical movement of single focal spot x-ray source and draws
The focal spot entering obscures, and which thereby enhances spatial resolution, and x-ray tube need not move to another position from a position,
Save sweep time, thus improve sweep speed.
Brief description
Fig. 1 is the flow chart of x-ray tomography method in an embodiment；
Fig. 2 is the applied environment figure of x-ray tomography method in an embodiment；
Fig. 3 is many focal spots x-ray source frontal schematic diagram in an embodiment；
Fig. 4 is scan pattern schematic diagram in an embodiment；
Fig. 5 is many focal spots x-ray source negative electrode distribution schematic diagram in an embodiment；
Fig. 6 is many focal spots x-ray source lateral plan in an embodiment；
Fig. 7 is with effects result figure in an embodiment；
Fig. 8 is the structural representation of x-ray tomographic system in an embodiment；
Fig. 9 is the structural representation of x-ray tomographic system in another embodiment；
Figure 10 is the structural representation of x-ray tomographic system in further embodiment；
Figure 11 be in another embodiment x-ray tomographic system structural representation.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with drawings and Examples, right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only in order to explain the present invention, not
For limiting the present invention.
In one embodiment, as shown in Figure 1, there is provided a kind of x-ray tomography method, the method includes:
Step 102, by controlling the voltage between the negative electrode of field emission unit of many focal spots x-ray source and grid, controls many
Focal spot x-ray source is scanned to detected object transmitting x-ray from different emission source point positions.
Multiple field emission units that many focal spots x-ray source arranges for linear array, specifically can adopt many focal spots carbon of linear array to receive
Mitron x-ray source.Negative electrode, grid and anode is comprised in field emission unit, if the voltage between negative electrode and grid is higher than predetermined threshold value,
Negative electrode produces electron emission, by the electronics accelerate (beamacceleration) to transmitting for the anode high voltage, the target surface of beam bombardment anode i.e. positive
Pole target, you can produce x-ray.If the voltage between negative electrode and grid is less than predetermined threshold value, electron emission stops, and also just no longer produces
X-ray.This cold cathode x-ray source based on field emission forms emission source point.Anode high voltage can according to detected object Lai
Determine, for example, produce the x-ray of breast imaging, anode high voltage is 10～50kv.Anode can adopt various shapes, preferably bar shaped
Anode, all emission source points can common anode, anode connected to high-voltage power supply by contact conductor.
Different voltages are applied between grid on the negative electrode of each field emission unit, you can control different emission source points
Transmitting and closing, thus realize the change of emission source point position.For example, make to launch x-ray at n-th emission source point position,
The voltage between the negative electrode of n-th emission source point position and grid only need to be made to be more than predetermined threshold value voltage, and other emission source point
Voltage between the negative electrode of position and grid is both less than predetermined threshold value voltage.Mos FET (metal-oxide- can be adopted
Semiconductor field-effect-transistor, abbreviation mosfet, i.e. the field effect of metal oxide synthesis semiconductor
Answer transistor) controlling transmitting and the closing of emission source point.By presetting the working time of each emission source point, multiple emission sources
Point can time-sharing work, thus reduce the thermic load of plate target, the service life of x-ray tube can be extended.
Step 104, receives the x-ray through detected object using flat panel detector, obtains the x-ray projection of multi-angle
Image.
Flat panel detector is located at below many focal spots x-ray source, receives the x-ray through detected object, due to many focal spots x
Radiographic source launches x-ray from different emission source point positions to detected object, so that the x-ray receiving forms multi-angle
X-ray projected image.As shown in Fig. 2 the applied environment for the x-ray tomography method in an embodiment.Many focal spots x
Radiographic source 202 is scanned to detected object 206 transmitting x-ray, and detected object 206 is fixed by plate for forcing 204,
Flat panel detector 208 is located at below detected object 206, receives the x-ray through compressing version and detected object, is formed polygonal
Degree x-ray projected image.Carried out by column 210 between many focal spots x-ray source 202, plate for forcing 204 and flat panel detector 208
Fixing, and vertically moved according to the height of different detected objects.
Step 106, the data of collection x-ray projected image, and the data collecting is carried out reconstruction obtain detected right
The faultage image of elephant.
The data of collection x-ray projected image, can adjust collection and regards according to x-ray in the dose of radiation of detected object
The number of angle image.For example, the data of 10～20 multi-view image can in mammary gland fault imaging, be gathered.To the number collecting
According to carrying out restoration and reconstruction, obtain the faultage image of detected object.
In the present embodiment, by controlling the voltage between the negative electrode of field emission unit of many focal spots x-ray source and grid, to control
Make many focal spots x-ray source to be scanned to detected object transmitting x-ray from different emission source point positions, using flat panel detector
Receive the x-ray through detected object, obtain the x-ray projected image of multi-angle, gather the data of x-ray projected image,
And the data collecting is carried out rebuilding the faultage image obtaining detected object.Due to using many focal spots x-ray source from difference
X-ray is launched in emission source point position, eliminates the focal spot introducing due to the mechanical movement of single focal spot x-ray source and obscures, thus
Improve spatial resolution, and x-ray tube need not move to another position from a position, saves sweep time, from
And improve sweep speed.Additionally, multiple emission source points can time-sharing work, thus reduce the thermic load of plate target, Neng Gouyan
The service life of long x-ray tube.
In one embodiment, many focal spots x-ray source comprises multiple emission source points, is launched using part in scanning process
Source point, scan pattern includes uniform pattern and non-uniform pattern.
In the present embodiment, many focal spots x-ray source comprises multiple emission source points, and emission source point is linearly distributed, parallel to flat
The plane of partitioned detector, and relative scanning central point is angularly to be distributed, that is, relative scanning between adjacent transmission source point
The angle of central point is identical.As shown in figure 3, being many focal spots x-ray source frontal schematic diagram in an embodiment.Many focal spots x
Radiographic source 302 includes n emission source point, wherein n > 30.It is x-ray beam that the x-ray of each emission source point transmitting is light beam, often
Bundle x-ray beam all has an optical axis, and the surface that n bar optical axis meets at flat panel detector 304 forms sweep center point o.Adjacent
Between emission source point the angle of relative scanning central point be δ θ, n emission source point relative scanning central point o always across angle be θ,
As δ θ is 1 °, θ is n °.The distance of emission source point to flat panel detector 304 is sdd, such as 65～70mm, and emission source point is to scanning
The distance of central point is sod, such as 60～65mm.
Only using part emission source point in each scanning process, that is, the emission source point number of many focal spots x-ray source
More than during actual scanning using the emission source point number arriving.The number of the part emission source point being used is by detected object
Averag density determine.Due to used in scanning process x-ray total radiation dose keep constant, detected object average
Density is bigger, and the x-ray dosage that single emission source point is launched is bigger, and the number of the part emission source point being used is just therewith
Reduce, that is, projection number reduces therewith.
The scan pattern of many focal spots x-ray source includes uniform pattern and non-uniform pattern, wherein, during non-uniform pattern includes
Between the sparse non-uniform pattern in close both sides and the close non-uniform pattern in middle sparse both sides.As shown in figure 4, for being to sweep in an embodiment
Retouch the schematic diagram of pattern.Wherein, emission source point centered on black round dot, white round dot be emission source point, emission source point relatively in
Heart emission source point is symmetric.Wherein, scan pattern 1 is uniform pattern, relative scanning central point, sending out every predetermined angle
Penetrate source point to be scanned, and default scanning times.As predetermined angle is 2 °, scanning times are 15 times.Scan pattern 2 is middle close
The sparse non-uniform pattern in both sides, relative scanning central point, the emission source point from side for the angle interval between emission source point to
Heart emission source point presets descending angle successively, and angle interval can be partly identical, and default scanning times.For example, preset
Descending angle is followed successively by 4 °, 3 °, 2 °, 2 °, 1 °, 1 °, 1 °, and scanning times are 15 times.Scan pattern 3 is middle thin both sides
Close pattern, relative scanning central point, other emission source points from side of the angle interval between emission source point are to emission center source
Point presets ascending angle successively, and angle interval can be partly identical, and default scanning times.For example, default descending
Angle be followed successively by 1 °, 1 °, 1 °, 2 °, 2 °, 3 °, 4 °, scanning times be 15 times.Scan pattern 2 is in transverse plane, that is, parallel
In the plane of flat panel detector, than scan pattern 1 and scan pattern 3, there is higher spatial resolution.Scan pattern 3 is vertical
Into plane, that is, vertically and in the plane of flat panel detector, than scan pattern 1 and scan pattern 2, there is higher spatial discrimination
Rate.The imaging performance of scan pattern 1 is between scan pattern 2 and scan pattern 3.Therefore, the different scan pattern of correspondence, can
Meet different imaging demand.
In one embodiment, many focal spots x-ray source also includes negative electrode and plate target, and the corresponding institute of wherein said negative electrode is in place
Put with the anglec of rotation, multiple target surfaces of described plate target are identical with corresponding cathode direction respectively and all target surface inclination angles phase
With the x-ray optical axis that described emission source point is launched is towards sweep center point.
In the present embodiment, many focal spots x-ray source also includes multiple negative electrodes and plate target.Many focal spots x-ray source includes multiple
Emission source point, each emission source point comprise one can independent control negative electrode, negative electrode can using monolithic construction or multisection type knot
Structure, such as 3 segmentation structures.Each negative electrode has effigurate emission area, such as oval.The corresponding position that it is located of each negative electrode
Put and rotate to an angle, the anglec of rotation of negative electrode can be different, and the corresponding negative electrode of emission center source point is that central cathode does not rotate.As
Shown in Fig. 5, it is many focal spots x-ray source negative electrode distribution map in an embodiment.The wherein corresponding position being located of each negative electrode has
Anglec of rotation β, central cathode does not rotate.Centered on central cathode, both sides negative electrode is symmetric.The of central cathode both sides
One cis-position negative electrode rotates 1 °, and the second cis-position negative electrode of central cathode both sides rotates 2 °, by that analogy, the n-th of central cathode both sides
Cis-position negative electrode rotates n °.
Plate target is that multiple detached target pieces embed in the anode seat of a bar shaped it is ensured that the corresponding the moon of each target surface
Extreme direction is identical and all target surface inclination angles is identical.So that the optical axis of x-ray beam that sends of all emission source points is both facing to sweeping
Retouch central point, improve the uniformity of x-ray distribution, and then improve spatial resolution.
Additionally, many focal spots x-ray source also includes grid and focusing electrode, grid and focusing electrode are monolithic construction, specifically
Can be multiple array of circular apertures monolithic construction, circular hole number be equal to negative electrode number.The electron beam of emission of cathode is through poly-
Defocused bombardment area on plate target is referred to as focus.Focus is less, and imaging effect is better.It is applied on focusing electrode by adjustment
Voltage can change Electric Field Distribution between these electrodes of negative electrode, grid, focusing electrode and anode, thus change bifocal size and
Shape.
In one embodiment, by controlling the voltage between the negative electrode of field emission unit of many focal spots x-ray source and grid,
Control many focal spots x-ray source after the step that x-ray is scanned is launched, to detected object, in different emission source point positions, also
Including: according to the mas value of emission source point and the distance between sweep center point regulation emission source point.
In the present embodiment, mas value is that tube current is per second, that is, the dose of radiation of x-ray, and mas value is higher, x-ray
Dose of radiation is bigger.The distance of emission source point to sweep center point can be represented with sod.Because emission source point is to scanning center
Square being inversely proportional to mas value of the distance of point, i.e. sod2* mas=k, wherein k are preset value.Sod increases, and mas value reduces,
Otherwise sod reduces, mas value increases.Thus can adjust the dose of radiation of x-ray.
In one embodiment, many focal spots x-ray source also includes beam-defining clipper, is sent out by controlling the field of many focal spots x-ray source
Penetrate the voltage between the negative electrode of unit and grid, control many focal spots x-ray source to send out to detected object from different emission source point positions
After penetrating the step that x-ray is scanned, also include: control the x-ray that emission source point is launched to cover flat board by beam-defining clipper
Detector image-forming region, and limit the x-ray border after bundle at the edge of detected object.
In the present embodiment, below the focus of many focal spots x-ray source, it is provided with beam-defining clipper above x-ray exit window, specifically
Porous beam-defining clipper can be adopted, the x-ray of each emission source point outgoing passes through limit beam hole on beam-defining clipper to emission, by limit
Bundle device is adjusted controlling so that the x-ray launched from each emission source point covers the imaging region of flat panel detector, and
X-ray border after limit bundle, at the edge of detected object, thus decreases non-essential to detected object to greatest extent
Radiation.
In another embodiment, porous beam-defining clipper has a limit beam hole, limit beam hole can take different shapes, such as little
Rectangle.The shape and size of limit beam hole determine the effect of beam-defining clipper.Many focal spots x-ray source adopts linear array structure, linear array
Focus be located at flat panel detector border directly over so that limit bundle after x-ray border detected object edge-perpendicular to
Under, it is to avoid x-ray oblique incidence non-essential radiation to detected object.
As shown in fig. 6, the lateral plan for many focal spots x-ray source.From the side, linear array focus is located at flat panel detector side
So that the x-ray border after wire harness is downward in the edge-perpendicular of detected object directly over boundary.Many focal spots x-ray source 602 is relatively
Plane in flat panel detector 606 has anglec of rotation α, and α can be made between 5 °～15 ° after beam-defining clipper 604 limit bundle
The x-ray than anode-side 602b for the x-ray of cathode side 602a is more covered in the imaging region of flat panel detector 606, thus
Overcome the impact of heel effect, obtain more preferable x-ray equalization of intensity.Heel effect, also known as anode effect, is
Refer to enter certain depth during high-velocity electrons bombardment plate target, the x-ray of generation can experience difference in different outgoing orientation
Decay so that the x-ray intensity of different azimuth is inconsistent.Effective focal spot is little, and x-ray amount is few, and image quality is all right, conversely,
Effective focal spot is big, and x-ray amount is many, and image quality is just poor.
As shown in fig. 7, describing the impact of heel effect.By cathode side x-ray due to comparing anode in scanning process
The path of the x-ray experience of side is short, and therefore outgoing intensity is bigger, and the uniformity of x-ray is more preferable.
In one embodiment, many focal spots x-ray source is encapsulated by metallic cavity, by controlling many focal spots x-ray source
Voltage between the negative electrode of field emission unit and grid, controls many focal spots x-ray source right to being detected from different emission source point positions
As, before the step that transmitting x-ray is scanned, also including: height is evacuated to by metallic cavity by control machinery pump and molecular pump
Vacuum；Whether the vacuum in detection metallic cavity is less than preset value；If so, then close metallic cavity slide valve, open from
Sub- pump, maintains the vacuum in metallic cavity.
In the present embodiment, many focal spots x-ray source is encapsulated by metallic cavity, can be dismantled.Only when in metallic cavity
Vacuum reach to a certain degree, many focal spots x-ray source could open work.Comprise in metallic cavity mechanical pump, molecular pump and
The parts such as ionic pump, when metallic cavity is closed first, are evacuated to high vacuum by control machinery pump and molecular pump by metallic cavity,
If the vacuum in detection metallic cavity be less than preset value, such as less than 10-7The vacuum of millimetres of mercury, then close metallic cavity
Slide valve, opens ionic pump, maintains the vacuum in metallic cavity, is that many focal spots x-ray source transmitting x-ray is ready.When
When metallic cavity is opened, by controlling vent valve, metallic cavity is inflated.
In one embodiment, as shown in Figure 8, there is provided a kind of x-ray tomographic system, comprising: scan module
802nd, image collection module 804 and image-forming module 806, wherein:
Scan module 802, the electricity between the negative electrode for the field emission unit by controlling many focal spots x-ray source and grid
Pressure, controls many focal spots x-ray source to be scanned to detected object transmitting x-ray from different emission source point positions.
Image collection module 804, for receiving the x-ray through detected object using flat panel detector, obtains polygonal
The x-ray projected image of degree.
Image-forming module 806, for gathering the data of x-ray projected image, and carries out reconstruction to the data collecting and obtains
The faultage image of detected object.
In one embodiment, many focal spots x-ray source comprises multiple emission source points, is launched using part in scanning process
Source point, scan pattern includes uniform pattern and non-uniform pattern.
In one embodiment, many focal spots x-ray source also includes negative electrode and plate target, wherein negative electrode corresponding position tool
There is an anglec of rotation, multiple target surfaces of plate target are identical with corresponding cathode direction respectively and all target surface inclination angles is identical, emission source
The x-ray optical axis that point is launched is towards sweep center point.
In one embodiment, as shown in figure 9, x-ray tomographic system also includes: adjustment module 808, for basis
The distance between emission source point and sweep center point adjust the mas value of emission source point.
In one embodiment, as shown in Figure 10, many focal spots x-ray source also includes beam-defining clipper, x-ray tomographic system
Also include: limit bundle module 810, for controlling the x-ray that emission source point is launched to cover flat panel detector imaging by beam-defining clipper
Region, and limit the x-ray border after bundle at the edge of detected object.
In one embodiment, many focal spots x-ray source is encapsulated by metallic cavity, as shown in figure 11, x-ray tomoscan
System also includes: vacuum control module 812 and detection module 814, wherein:
Vacuum control module 812, for being evacuated to high vacuum by control machinery pump and molecular pump by metallic cavity.
Detection module 814, for detecting whether the vacuum in metallic cavity is less than preset value.
If the vacuum that vacuum control module 812 is additionally operable in metallic cavity is less than preset value, close metallic cavity
Slide valve, opens ionic pump, maintains the vacuum in metallic cavity.
Embodiment described above only have expressed the several embodiments of the present invention, and its description is more concrete and detailed, but simultaneously
Therefore the restriction to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, some deformation can also be made and improve, these broadly fall into the guarantor of the present invention
Shield scope.Therefore, the protection domain of patent of the present invention should be defined by claims.
Claims (8)
1. a kind of x-ray tomography method, methods described includes:
By controlling the voltage between the negative electrode of field emission unit of many focal spots x-ray source and grid, control described many focal spots x-ray
Source is scanned to detected object transmitting x-ray from different emission source point positions；Wherein, many focal spots x-ray source comprise multiple
Emission source point and porous beam-defining clipper, porous beam-defining clipper has limit beam hole, and scan pattern includes non-uniform pattern, described multifocal
Spot x-ray source adopts array structure, and the focus of linear array is located at directly over flat panel detector border, scanned in non-uniform pattern
The x-ray that in journey, part emission source point is launched covers described flat panel detector by the limit beam hole on beam-defining clipper to emission
Imaging region, and it is downward in the edge-perpendicular of detected object to limit the x-ray border after bundle；
Receive the x-ray through described detected object using flat panel detector, obtain the x-ray projected image of multi-angle；
Gather the data of described x-ray projected image, and the data collecting is carried out rebuilding obtain described detected object
Faultage image.
2. method according to claim 1 is it is characterised in that described many focal spots x-ray source also includes negative electrode and plate target,
The corresponding position of wherein said negative electrode has an anglec of rotation, multiple target surfaces of described plate target respectively with corresponding cathode direction
Identical and all target surface inclination angle is identical, and the x-ray optical axis that described emission source point is launched is towards sweep center point.
3. method according to claim 2 it is characterised in that described by control many focal spots x-ray source Flied emission list
Voltage between the negative electrode of unit and grid, controls described many focal spots x-ray source to send out to detected object from different emission source point positions
After penetrating the step that x-ray is scanned, also include:
Mas value according to described emission source point and the distance between the described sweep center point described emission source point of regulation.
4. method according to claim 1 is it is characterised in that described many focal spots x-ray source is encapsulated by metallic cavity；Institute
State the voltage between the negative electrode of field emission unit and the grid by controlling many focal spots x-ray source, control described many focal spots x-ray source
Before the step that x-ray is scanned is launched, to detected object, in different emission source point positions, also include:
High vacuum is evacuated to by described metallic cavity by control machinery pump and molecular pump；
Detect whether the vacuum in described metallic cavity is less than preset value；
If so, then close the slide valve of described metallic cavity, open ionic pump, maintain the vacuum in described metallic cavity.
5. a kind of x-ray tomographic system is it is characterised in that described system includes:
Scan module, the voltage between the negative electrode for the field emission unit by controlling many focal spots x-ray source and grid, control institute
State many focal spots x-ray source to be scanned to detected object transmitting x-ray from different emission source point positions；Wherein, many focal spots x penetrates
Line source comprises multiple emission source points and porous beam-defining clipper, and porous beam-defining clipper has limit beam hole, and scan pattern includes non-homogeneous
Pattern, described many focal spots x-ray source adopts array structure, and the focus of linear array is located at directly over flat panel detector border, non-equal
The x-ray that in the scanning process of even pattern, part emission source point is launched, is covered to emission by the limit beam hole on beam-defining clipper
Described flat panel detector imaging region, and it is downward in the edge-perpendicular of detected object to limit the x-ray border after bundle；
Image collection module, for receiving the x-ray through described detected object using flat panel detector, obtains multi-angle
X-ray projected image；
Image-forming module, for gathering the data of described x-ray projected image, and the data collecting is carried out reconstruction obtain described
The faultage image of detected object.
6. system according to claim 5 is it is characterised in that described many focal spots x-ray source also includes negative electrode and plate target,
The corresponding position of wherein said negative electrode has an anglec of rotation, multiple target surfaces of described plate target respectively with corresponding cathode direction
Identical and all target surface inclination angle is identical, and the x-ray optical axis that described emission source point is launched is towards sweep center point.
7. system according to claim 6 is it is characterised in that described system also includes:
Adjustment module, for according to described emission source point and the distance between the described sweep center point described emission source point of regulation
Mas value.
8. system according to claim 5 is it is characterised in that described many focal spots x-ray source is encapsulated by metallic cavity, institute
System of stating also includes:
Vacuum control module, for being evacuated to high vacuum by control machinery pump and molecular pump by described metallic cavity；
Detection module, for detecting whether the vacuum in described metallic cavity is less than preset value；
If the vacuum that described vacuum control module is additionally operable in described metallic cavity is less than preset value, close described wire chamber
The slide valve of body, opens ionic pump, maintains the vacuum in described metallic cavity.
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| EP3454752B1 (en) * | 2016-05-11 | 2019-07-10 | Koninklijke Philips N.V. | Anatomy adapted acquisition with fixed multi-source x-ray system |
| CN107072022B (en) * | 2016-12-16 | 2019-07-02 | 中国科学院深圳先进技术研究院 | X-ray tomography method and system |
| CN111107788B (en) | 2017-07-26 | 2023-12-19 | 深圳帧观德芯科技有限公司 | X-ray imaging system with spatially scalable X-ray source |
| JP7169256B2 (en) * | 2019-07-26 | 2022-11-10 | 富士フイルム株式会社 | Tomosynthesis imaging control device, operating method for tomosynthesis imaging control device, operating program for tomosynthesis imaging control device, and radiation generator |
| EP4064993A4 (en) * | 2019-12-28 | 2023-05-03 | Shanghai United Imaging Healthcare Co., Ltd. | Imaging systems and methods |
| CN113116364B (en) * | 2019-12-31 | 2023-07-14 | 上海联影医疗科技股份有限公司 | Mammary gland X-ray imaging device |
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| DE2658533A1 (en) * | 1976-12-23 | 1978-06-29 | Siemens Ag | DEVICE FOR REPRESENTING LIGHTING BODY LAYER IMAGES |
| US8155262B2 (en) * | 2005-04-25 | 2012-04-10 | The University Of North Carolina At Chapel Hill | Methods, systems, and computer program products for multiplexing computed tomography |
| US7751528B2 (en) * | 2007-07-19 | 2010-07-06 | The University Of North Carolina | Stationary x-ray digital breast tomosynthesis systems and related methods |
| DE102008050352B4 (en) * | 2008-10-02 | 2012-02-16 | Siemens Aktiengesellschaft | Multi-beam X-ray device |
| DE102009043421A1 (en) * | 2009-09-29 | 2011-04-07 | Siemens Aktiengesellschaft | Method and device |
| CN103462630B (en) * | 2013-09-13 | 2015-04-08 | 深圳先进技术研究院 | Computed tomography (CT) system and CT scanning method |
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