CN104337540B - X-ray unit with gap aperture - Google Patents
X-ray unit with gap aperture Download PDFInfo
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- CN104337540B CN104337540B CN201410371675.7A CN201410371675A CN104337540B CN 104337540 B CN104337540 B CN 104337540B CN 201410371675 A CN201410371675 A CN 201410371675A CN 104337540 B CN104337540 B CN 104337540B
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- BSYNRYMUTXBXSQ-UHFFFAOYSA-N Aspirin Chemical compound CC(=O)OC1=CC=CC=C1C(O)=O BSYNRYMUTXBXSQ-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000007493 shaping process Methods 0.000 claims description 9
- 238000003325 tomography Methods 0.000 claims description 9
- 229910002056 binary alloy Inorganic materials 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims 1
- 230000005855 radiation Effects 0.000 description 12
- 238000003384 imaging method Methods 0.000 description 8
- 238000002591 computed tomography Methods 0.000 description 7
- 238000004422 calculation algorithm Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
- G21K1/02—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators
- G21K1/04—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators using variable diaphragms, shutters, choppers
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computed tomography [CT]
- A61B6/037—Emission tomography
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/06—Diaphragms
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/52—Devices using data or image processing specially adapted for radiation diagnosis
- A61B6/5205—Devices using data or image processing specially adapted for radiation diagnosis involving processing of raw data to produce diagnostic data
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/40—Arrangements for generating radiation specially adapted for radiation diagnosis
- A61B6/405—Source units specially adapted to modify characteristics of the beam during the data acquisition process
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- Spectroscopy & Molecular Physics (AREA)
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Abstract
The present invention includes a kind of x-ray unit and a kind of method for recording x-ray projection.It is designed to be used according to the x-ray unit of the present invention along the longitudinal axis and check object is moved with feed speed, and also includes the recording unit that can be rotated around the longitudinal axis.Recording unit includes the X-ray emitter of the X-ray for emitting x-ray form and the X-ray detector for detecting X-ray.Inventor recognizes, it is with the width along the longitudinal axis is D_1 the first opening, designed to be used be formed in longitudinal axis horizontal have width D Z_1 X-ray beam, stationary positioned the first gap aperture and with that the width along the longitudinal axis is D_2 is the second opening, designed to be used and be formed in longitudinal axis horizontal there is the second gap aperture of width D Z_2 X-ray beam to be sufficient to realize the elective irradiation under helicon mode to effective volume, wherein there is DZ_2<DZ_1.
Description
Technical field
The present invention relates to a kind of x-ray unit and a kind of method for recording x-ray projection.
Background technology
Computer tomography is a kind of imaging method, and it is mainly used in medical diagnosis and for material tests.In order to
The radioscopic image of fault imaging is recorded, X-ray emitter and the X-ray detector acted on together surround check object
Rotation.In helicon mode, check object is moved along rotary shaft, while recording x-ray projection under different angle positions.
After the x-ray projection under have recorded helicon mode, the x-ray projection is handled, so that the X for producing the fault imaging of three-dimensional is penetrated
Line image.The region for the check object that should be rebuild also referred to as effective volume.The record of x-ray projection under helicon mode
Referred to as helical scanning.
For the radioscopic image of reconstruction tomography, the x-ray projection group recorded during helical scanning must be complete
's.If only should from the limited effective volume in check object reconstruction tomography radioscopic image, swept after needing
(Nachlauf) or prescan (Vorlauf) are retouched, wherein the region generally also outside scanning effective volume.Because nowadays X-ray is visited
Survey the usual big width of device and need the rear scanning or prescan.Thus bring outside for check object effective volume need not
The radiation burden wanted.This is especially problematic in medical domain when check object is patient.With the width of Modern X-ray detector
The increase of degree or line number, the problem becomes more serious.One kind is avoided in helical scanning due to caused by rear scanning or prescan
The possibility of unnecessary radiation burden is, shapes X-ray by aperture so that actually only irradiate effective volume.
Known a kind of diaphragm apparatus from the A1 of DE 10 2,005 018 811, it is used to set for the scanning of object
, X-ray apparatus with least two apertures, wherein, being capable of at least portion by the second aperture at least one Scanning Section
Ground is divided dynamically to cover the radiation beam adjusted using the first aperture.In addition, known from described open file, remaining spoke
Beam only irradiates the region of the contributive object of reconstruction for image.In addition, aperture can be gap aperture.
The content of the invention
The technical problem to be solved in the present invention is, by the technology of aperture simply arrange by the tomography of helicon mode into
As record in due to it is rear scanning or prescan caused by radiation burden remain very little.
The technical problem is addressed by the x-ray unit according to the present invention and according to the method for the present invention.
The following describe on claimed equipment and on claimed method technical problem according to this
The solution of invention.Feature, advantage or alternate embodiments can also equally be converted to other claimed as mentioned herein
Content, vice versa.In other words, for example the device claim for equipment can also be extended with associated methods and retouch
The feature stated or be claimed.Here, constructing the functional character of corresponding method by corresponding apparatus module.
The present invention includes a kind of x-ray unit and a kind of method for recording x-ray projection.According to the X of the present invention
Ray unit is designed to move check object along the longitudinal axis with feed speed, and also includes that the note that the longitudinal axis rotates can be surrounded
Record unit.Recording unit includes the X-ray emitter of the X-ray for emitting x-ray form and for detecting X-ray
X-ray detector.It was recognized by the inventor that with along the longitudinal axis width for D_1 first opening, be designed to be formed in
Longitudinal axis horizontalX-ray beam, stationary positioned the first gap aperture with width D Z_1 and with along vertical
The width of axle for D_2 second opening, be designed to be formed in the second of the X-ray beam that longitudinal axis horizontal has width D Z_2
Gap aperture is sufficient to realize the elective irradiation under helicon mode to effective volume, wherein there is DZ_2<DZ_1.Because root
Only the second gap aperture is moved according to feed speed along the longitudinal axis according to the present invention so that the X-ray shaped by gap aperture is only
The contributive region of the radioscopic image to reconstruction tomography of examination object, so in the fault imaging of helicon mode
Record in due to it is rear scanning or prescan caused by radiation burden remain very little.
Proposed aperture arrangement is technically particularly easy to realize, because single aperture need only be movably disposed.Separately
Outside, aperture is gap aperture according to the present invention, so that need only make to move as an overall aperture, rather than mobile aperture
Various pieces are mutually mobile even more than aperture is relative.In addition, gap aperture is relative to multiple moveable parts
Aperture can be manufactured easily and at low cost.In addition, the displacement of gap aperture becomes relatively easy, so that with different in width
The aperture of opening can be used for the method according to the invention.Therefore technology is simple, inexpensive and flexible by the present invention.
It is another aspect of this invention to provide that check object is in helicon mode, with the first feed speed during prescan
It is mobile, and moved during rear scanning with the second feed speed, wherein being moved as follows respectively during rear scanning and prescan
Second gap aperture so that the X-ray beam shaped by gap aperture with check object same speed along the longitudinal axis respectively to move
It is dynamic.
It is another aspect of this invention to provide that carrying out the X-ray of fault imaging based on the x-ray projection recorded according to the present invention
The reconstruction of image, wherein, described rebuild includes being weighted according to the intensity of the X-ray shaped by gap aperture.Because by
In the fact only moving the second gap aperture and the first gap of stationary positioned aperture, cause to scan almost for prescan or afterwards
The irradiation of the X-ray detector at each time point is asymmetric.If reading detector element during helical scanning,
Must be when rebuilding by weighting consideration asymmetry.Complete reading detector and subsequent weighting are technically easily realized.
It is another aspect of this invention to provide that being weighted when rebuilding binary system.Which is particularly easy to realize.
It is another aspect of this invention to provide that the intensity of the X-ray with being shaped by gap aperture is proportionally weighted.
Which is especially accurate, because have also contemplated that part is covered.Particularly in the case where particularly rapidly moving the second gap aperture,
Which has advantage.
It is another aspect of this invention to provide that the reconstruction is the filtered back projection of weighting.Reconstruction based on filtered back projection
Algorithm provides the advantage of relatively short run time and relatively little of computing cost.
It is another aspect of this invention to provide that the reconstruction is the reconstruction of the iteration weighted by statistics.The reconstruction of iteration
Algorithm provides high-resolution (particularly in edge) and is difficult out the advantage of artifact.
Brief description of the drawings
The present invention is described in detail and explained below by the embodiment being shown in the drawings.Wherein：
Fig. 1 shows the x-ray unit according to the present invention in computer tomography instrument form,
Fig. 2 shows the cross section arranged according to the gap aperture of the present invention,
Fig. 3 show in graphical form two gap apertures during the record of helicon mode relative to frame according to this
The position of invention, and
Fig. 4 shows two gap apertures root relative to check object during the record of helicon mode in graphical form
According to the position of the present invention.
Embodiment
Fig. 1 shows the x-ray unit according to the present invention in computer tomography instrument form, and it has record
Member, the recording unit includes X-ray emitter 8 and X-ray detector 9.Recording unit is surrounded during x-ray projection is recorded
The longitudinal axis 5 rotates, and the X-ray of the emitting x-ray form during recording of X-ray emitter 8.X-ray beam is particularly can be with
Shaping sector or taper.Computer tomography instrument can also have more than the X-ray emitter 8 of only one and more than only one
X-ray detector 9, to realize the record according to so-called dual energy method.In example shown here, X-ray hair
Emitter 8 is X-ray tube.In example shown here, X-ray detector 9 is the row detector with multiple rows, for example with
128 rows or with 256 rows.But, X-ray detector 9 can also be configured to planar detector.The generally quilt of X-ray detector 9
Scintillation counter is configured to, sigmatron photon is converted into the lower energy photon in spectrum by it by scintillator, and then
Detected by photodiode.X-ray detector 9 can be alternatively configured to the detector directly changed, its by
Sigmatron photon is directly converted into the letter of electricity by semi-conducting material by internal light stimulus in the case where making full use of photovoltaic principle
Number stream.
When recording x-ray projection, patient 3 is lain on patient table 6, and patient table is connected with bed pedestal 14 so that
Patient table 6 of the bed pedestal carrying with patient 3.Patient table 6 is designed to move with feed speed along record direction
Patient passes through the opening 10 of recording unit.Record direction is generally provided by the longitudinal axis 5, and the longitudinal axis is also the rotary shaft of recording unit.
But, the longitudinal axis 5 can also relative record direction (moving patient 3 along the record direction during recording) be it is inclined, for example
By the part that recording unit is configured to tiltable frame.
X-ray projection is recorded from different directions by rotating recording unit, and it can be reconstructed into high-resolution, space three
The data group of dimension.Recorded according to the present invention according to helicon mode, wherein continuously moving patient 3 along the longitudinal axis 5.Such as Fig. 3
It is shown, it is divided into three phases, i.e. prescan, the scanning of effective volume and rear scanning according to the record of helicon mode.In order to keep away
Exempt from the unnecessary irradiation to patient 3 during rear scanning or prescan, two gap aperture conducts arranged according to the present invention
The part of recording unit.Gap aperture is both located at 8 sides of the eye point for being directly adjacent to X-ray of X-ray emitter.Two
Individual gap aperture is designed to be used to shape X-ray or X-ray beam by absorbing X-ray.Therefore, gap aperture is inhaled by level
The material for receiving X-ray is constituted, and the material can for example include tungsten, molybdenum, iron and other metals.
According to the present invention, the first gap aperture 15 is fixed positioned in recording unit, and the second gap aperture 16 can root
Moved according to the feed speed of patient 3 along the longitudinal axis 5.The movement of second gap aperture 16 can be real by actuator, such as motor
It is existing.Therefore, recording unit only has the unique, actuator of such as motor form in an embodiment of the invention, uses
In mobile gap aperture, the present invention is thus set to become technology simple and inexpensive.
In example shown here, computer tomography instrument also includes computer 12, and it is for example designed to control
Computer tomography instrument processed and for storing and handling substantial amounts of x-ray projection.Computer 12 with it is defeated for example for image
The output unit 11 for going out the radioscopic image of fault imaging is connected.Output unit 11 be, for example, one or more LCD, plasma or
OLED screen curtain.In addition, computer 12 is connected with input block 13.Input block 13 is for example used for for processing x-ray projection choosing
Select parameter.Input block 13 is, for example, keyboard, mouse, so-called touch screen or microphone for speech input.Interface makes to succeed in one's scheme
Calculation machine 12 can communicate with computed tomography imager and with input block 13 or output unit 11.Interface is generally known hard
Part interface or software interface, e.g. hardware interface pci bus, USB or live wire.
In yet another embodiment of the present invention, x-ray unit has reconstruction unit 4.Reconstruction unit 4 can both include
Hardware, can also include software.Reconstruction unit 4 can for example include FPGA or processor.In example shown here, rebuild
Unit 4 is configured to computer program, and it can be loaded into the internal storage of computer 12.But, in the reality of replacement
Apply in mode, reconstruction unit 4 can also be located on single computer, the computer is not designed to control computer and broken
Layer imager.
Fig. 2 shows the cross section arranged according to the gap aperture of the present invention.It is D_1's with the width along the longitudinal axis 5
First opening, the first gap aperture 15 of stationary positioned is designed to be formed in the level of the longitudinal axis 5 has width D Z_1 X
Beam.The second gap aperture 16 with the width along the longitudinal axis 5 for D_2 the second opening is designed to be formed in the longitudinal axis
5 level has width D Z_2 X-ray beam, wherein DZ_2≤DZ_1.There is DZ_2 in alternative embodiment<DZ_1.
This, width is measured respectively along the longitudinal axis 5, and z coordinate is also defined below the longitudinal axis.By the width at the level of the longitudinal axis 5, table
Show X-ray beam width along the longitudinal axis when projecting on the longitudinal axis 5, go out as shown in Figure 2.The idea of the present invention is to pass through
The radiation beam highest of two gap aperture shapings can have width D Z_2.Therefore, represented by width D Z_1 in projected X-rays
Beam and when being only formed with this place by the first gap aperture 15 (effect i.e. without the second gap aperture 16)
Width.
Strictly speaking, position of the width of radiation beam with the second gap aperture 16 along the longitudinal axis 5 is relevant.Simplifiedly, here
It has ignored due to the effect of projection distortion caused by the different angles between X-ray and the second gap aperture 16.By second
The width D Z_2 of radiation beam represents width when the first opening relative to the first gap aperture 15 is medially orientated.Alternatively,
The orientation placed in the middle relative to X-ray emitter 8 can also be represented.
In embodiment as shown here, the gap aperture 16 of the first gap aperture 15 to the second is closer to x-ray source 8.
In alternative embodiment, the gap aperture 15 of the second gap aperture 16 to the first is closer to x-ray source 8.In addition, institute herein
In the example shown, D_2<D_1.
The part of the absorption X-ray radiation of second gap aperture 16 must be arrived greatly can be by moving second along the longitudinal axis 5
Gap aperture 16 carrys out the opening of the first aperture of complete closure 15.In other words, the second gap aperture 16 must so be dimensioned, cloth
Put and may move so that the second gap aperture 16 can stop the x-ray bombardment launched by X-ray emitter 8 to X-ray completely
Detector 9 or the check object between X-ray emitter 8 and X-ray detector 9.
Gap aperture (particularly in the case of spherical form) can have the opening of rectangle, its be also perpendicularly to here with
D_1 or the width represented with D_2 extend.Especially, the opening of the first and second gap apertures can respectively as far as possible perpendicular to
The width represented with D_1 or with D_2 extends so that it in this direction being capable of X-ray irradiation detector 9 completely.Other
In embodiment, gap aperture is flat or cylinder form.
It is dimensioned so that the X-ray shaped by the first gap aperture 15 can shine for the opening of the first gap aperture 15
Penetrate the entire surface of X-ray detector 9.In embodiment shown here, the first gap aperture 15 is fixed positioned on record
In first so that its opening is medially orientated also relative to X-ray detector 9.This is carried out by the first middle position 17 in fig. 2
Illustrate, which show the middle position of the X-ray shaped by the first gap aperture 15.On the contrary, being shaped by the second gap aperture 16
The second middle position 18 of X-ray be moveable because the second gap aperture 16 is removable along the longitudinal axis 5, and in addition
There is D_2 in example as shown here<D_1.According to the present invention, the second gap aperture 16 is during helical scanning along the longitudinal axis 5
Mobile is to cause X-ray producing, being shaped by two gap apertures asymmetrically to irradiate X in the most of the time of helical scanning
Ray detector 9.Asymmetric irradiation is it is meant that the middle position of the X-ray produced is not occupied relative to X-ray detector 9
In.
In other embodiment, the second gap aperture 16 has at least one width D _ 3 ≠ D_2 along the longitudinal axis 5
Other opening, be designed to be formed in the level of the longitudinal axis 5 have width D Z_3 ≠ DZ_2 and DZ_3≤DZ_1 or
DZ_3<DZ_1 X-ray beam.In change preferably, there is D_3≤D_1 or D_3<D_1.In this embodiment, must
Palpus mutual distance far installs at least two openings of the second gap aperture 16 so that the second gap aperture 16 can stop completely
The X-ray shaped by the first gap aperture 15.In other words, the second gap aperture 16 has between always must being open at least two
There are the members for absorbing X-ray, its width is enough to fully absorb the X-ray shaped by the first gap aperture 15.
Fig. 3 show in graphical form two gap apertures during the record of helicon mode relative to frame according to this
The position of invention.Here, being labelled with the time on the horizontal axis, represented with " t ", and be labelled with z coordinate on a vertical axis, with
" z " is represented.The time interval between t_0 and t_1 should be referred to as dt_1 below, the time interval between t_1 and t_2 is referred to as
Dt_2, and the time interval between t_2 and t_3 is referred to as dt_3.The pre- of helical scanning is carried out in time interval dt_1 to sweep
Retouch, scanned after being carried out in time interval dt_3.During rear scanning or prescan, it is not necessary in order to record the reconstruction of fault imaging
Required x-ray projection and X-ray irradiation detector 9 completely.More precisely, the check object during rear scanning or prescan
The irradiation equivalent to complete X-ray irradiation detector 9 mean only that unnecessary radiation burden.On the contrary, in time interval dt_
In 2, check object irradiation can be caused to it equivalent to complete X-ray irradiation detector 9, because only effective in this case
Volume is located on radiation path.Scanning or prescan are due to helicon mode but necessary afterwards, and with X-ray detector 9
Width increase and show it is main the problem of medical domain because it has the opposite effect to pursuing dose efficiency.
According to the present invention, during helical scanning according to feed speed along the longitudinal axis 5 of check object or patient table 6 come
Mobile second gap aperture 16 so that the X to reconstruction tomography of the X-ray only examination object shaped by gap aperture
The contributive region of ray image.In other words, irradiation area 20 as shown in Figure 3 is only effective volume.The ginseng selected there
Examine is based on the first gap aperture 15.Second gap aperture 16 is being swept during rear scanning or prescan with First Speed v_B1
Moved during retouching effective volume with second speed v_B2 along z directions, wherein, the feeding of speed v_B1 and v_B2 and check object
Speed is relevant.In embodiments of the present invention, the second gap aperture 16 is moved according to feed speed so that particularly in difference
Pitch changes between time interval.In helicon mode, pitch is defined as patient table 6 in each recording unit rotational case
Under the ratio for entering to give width of the detector 9 along the longitudinal axis 5.
Fig. 4 shows two gap apertures root relative to check object during the record of helicon mode in graphical form
According to the position of the present invention.In chart as shown here, make between check object and the first gap aperture 15 due to inspection pair
Relative motion is visible as formed by the motion with feed speed.Feed speed is improved in the second time interval dt_2.
In one and the 3rd time interval by the speed of the second gap aperture 16 measurement for cause the X-ray beam that is shaped by gap aperture with
Corresponding feed speed movement.Second gap aperture 16 then first and the 3rd in time interval it is solid on check object position
It is fixed.Only in the second time interval dt_2, the speed of feed speed and X-ray beam is had any different.The movement of second gap aperture 16
Cause only to irradiate effective volume 19 with the ratio according to the present invention of feed speed, and do not irradiated during rear scanning or prescan
Region 21a, b outside effective volume.In the conventional method using static aperture, the region outside opposite irradiation effective volume
21a、b。
In an embodiment of the invention, check object is in very first time interval dt_1 and the 3rd time interval
Moved respectively with the first feed speed v_1 in dt_3, and in the second time interval dt_2 with the second feed speed v_2>V_1 is moved
It is dynamic, wherein the second gap aperture 16 can be moved so that the region by x-ray bombardment of X-ray detector 9 is between the very first time
Breadth Maximum is expanded to along the longitudinal axis 5 from minimum widith every period, wherein, X-ray irradiates maximum during the second time interval
The scope of width, wherein, the region by x-ray bombardment of X-ray detector 9 is contracted during the 3rd time interval from maximum magnitude
It is small to arrive minimum zone.
In another embodiment of the invention, is given by v_2=v_1 (1+ (DZ_1-DZ_2)/(L-DZ_2))
Two feed speeds, wherein L are width of the effective volume along the longitudinal axis 5.Here, the second gap aperture 16 can be first and
Three time intervals are moved with the first aperture speed vB_1 respectively, so that the speed of X-ray beam is equal to v_1.In addition, the second gap
Aperture 16 can be moved in the second time interval with the second aperture speed vB_2, so that the speed of X-ray beam is equal to (DZ_1-
DZ_2)/dt_2.The speed of X-ray beam always represents the speed in the level of the longitudinal axis 5.
In another embodiment of the invention, the speed is given by following relation, wherein, given effectively by L
Length of the volume along the longitudinal axis 5.Patient table 6 moves, and the check object being thus located on patient table 6 is according to following speed
Degree movement：
- v_1, between time point t_0 and t_1=t_0+DZ_2/v_1；
- v_2=v_1 (1+ (DZ_1-DZ_2)/(L-DZ_2)), between time point t_1 and t_2=t_0+L/v_1；
And
- v_1, between time point t_2 and t_3=t_0+ (L+DZ_2)/v_1.
Then, the movement of the second gap aperture 16 is so that the X-ray beam shaped by two gap apertures is according to following speed
Degree is moved along the longitudinal axis 5：
- v_1, between time point t_0 and t_1 and between time point t_2 and t_3；And
-(DZ_1-DZ_2)/(t_2-t_1)。
In other changes of embodiment described here, speed and the second gap aperture 16 for check object
The speed transition between different time interval of speed is not discrete, but continuously.
Corresponding to the central position of the described X-ray according to the embodiment of the present invention, produced during helical scanning
Put to change into and cause the asymmetrically X-ray irradiation detector 9 during the most of the time of helical scanning.Thus, rebuilding disconnected
, it is necessary to be weighted to the X-ray shaped by X-ray detector 9 during the radioscopic image of layer imaging.This is especially as completely
X-ray irradiation detector 9 is set up when equally reading the detector element of X-ray detector 9.Weighting during rebuilding is always
It is related to the weighting to X-ray, just as no check object interference radiation path.In this case, the purpose of weighting be
The intensity of X-ray caused by movement or the position due to gap aperture is considered during reconstruction.It therefore, it can according to gap aperture
Know mobile or position to calculate intensity, then to use it for weighting., can also be in no inspection pair for calibration intensity value
The helical scanning according to the present invention is performed as in the case of.
It is weighted according to the X-ray shaped by gap aperture such as binary system, because such weighting is especially held
Easily realize.Alternatively, the intensity of the X-ray with being shaped by gap aperture is proportionally weighted, because this kind of weighting
It is especially accurate, particularly in the case where the second gap aperture 16 is quickly mobile.It is strong with the X-ray that is shaped by gap aperture
The proportional weighting of degree have also contemplated that half masking (Halbschatten) effect.In other embodiment, it can follow
Other mathematical relationships are weighted, for example can be with square ground or exponentially related to intensity level.
In the embodiment of the reconstruction according to the present invention, it is related to the filtered back projection of weighting.Based on filtered back projection
Algorithm for reconstructing is there is provided relatively short run time and the advantage of relatively small computing cost.In another embodiment of the present invention
In, reconstruction is the reconstruction that the iteration carried out is weighted by statistics.The algorithm for reconstructing of iteration provides high-resolution and (particularly existed
Edge) and it is difficult out the advantage of artifact.
Although illustrating and describing in detail in detail the present invention by preferred embodiment, the present invention is not by open
Example limitation, and thus technical staff can derive other changes, without departing from protection scope of the present invention.
Claims (12)
1. a kind of x-ray unit, the X-ray for recording the check object that can be moved along the longitudinal axis (5) with feed speed is thrown
Shadow, including the recording unit that can be rotated around the longitudinal axis (5), wherein, the recording unit includes：
- X-ray emitter (8), for the X-ray of emitting x-ray form, and X-ray detector (9), for detecting
State X-ray,
First gap aperture (15) of-stationary positioned, it has the first opening for D_1 along the width of the longitudinal axis (5), is designed
For there is width D Z_1 X-ray beam for being formed in the level of the longitudinal axis (5),
- the second gap aperture (16), it has the second opening for D_2 along the width of the longitudinal axis (5), designed to be used shaping
There is width D Z_2 X-ray beam in the level of the longitudinal axis (5),
Wherein, DZ_2≤DZ_1,
Wherein, can be according to the feed speed along mobile second gap aperture (16) of the longitudinal axis (5) so that by the
One gap aperture (15) and the X-ray beam only examination object of the second gap aperture (16) shaping to reconstruction tomography
The contributive region of radioscopic image,
Wherein, the check object is moved in helicon mode during prescan with the first feed speed, and in rear sweep time
Between moved with the second feed speed, and wherein, second gap aperture (16) energy respectively during rear scanning and prescan
Enough movements are to enable X-ray beam with mobile along the longitudinal axis (5) with the check object same speed.
2. according to the x-ray unit described in claim 1, in addition to reconstruction unit (4), it is designed to be used based on by institute
The x-ray projection for stating x-ray unit record carrys out the radioscopic image of reconstruction tomography, wherein, described rebuild is included according to passing through
The intensity of first gap aperture (15) and the X-ray of second gap aperture (16) shaping is weighted.
3. according to the x-ray unit described in claim 2, wherein, carry out the weighting binary system.
4. according to the x-ray unit described in claim 2, wherein, with passing through first gap aperture (15) and described second
The intensity of the X-ray of gap aperture (16) shaping proportionally carries out the weighting.
5. according to the x-ray unit any one of claim 2 to 4, wherein, the reconstruction, which is that the filtering weighted is counter, throws
Shadow.
6. according to the x-ray unit any one of claim 2 to 4, wherein, the reconstruction be by statistics weight into
The reconstruction of capable iteration.
7. it is a kind of in helicon mode by the recording unit records x-ray projection that can be rotated around the longitudinal axis (5) method, its
In, the recording unit includes：
- X-ray emitter (8), for the X-ray of emitting x-ray form, and X-ray detector (9), for detecting
State X-ray,
First gap aperture (15) of-stationary positioned, it has the first opening for D_1 along the width of the longitudinal axis (5), is designed
For there is width D Z_1 X-ray beam for being formed in the level of the longitudinal axis (5),
- the second gap aperture (16), it has the second opening for D_2 along the width of the longitudinal axis (5), designed to be used shaping
There is width D Z_2 X-ray beam in the level of the longitudinal axis (5),
Wherein, DZ_2≤DZ_1,
Wherein, check object is moved with feed speed along the longitudinal axis (5),
Wherein, second gap aperture (16) is moved along the longitudinal axis (5) according to the feed speed so that by the first seam
The X-ray to reconstruction tomography of gap aperture (15) and the X-ray only examination object of the second gap aperture (16) shaping
The contributive region of image,
Wherein, the check object is moved during prescan with the first feed speed, and with the second feeding during rear scanning
Speed movement, and wherein, it is respectively that second gap aperture (16) is mobile for so that X is penetrated during rear scanning and prescan
Wire harness is always with mobile along the longitudinal axis (5) with the check object same speed.
8. it is a kind of based on the x-ray projection recorded in accordance with the method for claim 7 come the radioscopic image of reconstruction tomography
Method, wherein, it is described rebuild include according to by first gap aperture (15) and second gap aperture (16) into
The intensity of the X-ray of shape is weighted.
9. in accordance with the method for claim 8, wherein, carry out the weighting binary system.
10. in accordance with the method for claim 8, wherein, with passing through first gap aperture (15) and second gap
The intensity of the X-ray of aperture (16) shaping proportionally carries out the weighting.
11. according to the method any one of claim 8 to 10, wherein, the reconstruction is the filtered back projection of weighting.
12. according to the method any one of claim 8 to 10, wherein, the reconstruction is to weight to carry out by statistics
Iteration reconstruction.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102013215042.3A DE102013215042B4 (en) | 2013-07-31 | 2013-07-31 | X-ray unit with slit diaphragms |
| DE102013215042.3 | 2013-07-31 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104337540A CN104337540A (en) | 2015-02-11 |
| CN104337540B true CN104337540B (en) | 2017-07-28 |
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| CN201410371675.7A Active CN104337540B (en) | 2013-07-31 | 2014-07-31 | X-ray unit with gap aperture |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN104337540B (en) |
| BR (1) | BR102014018632A2 (en) |
| DE (1) | DE102013215042B4 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102016221205B4 (en) | 2016-10-27 | 2018-07-26 | Siemens Healthcare Gmbh | Method for generating X-ray images and X-ray system |
| CN112075947B (en) * | 2020-08-24 | 2023-06-16 | 南昌大学第一附属医院 | Real-time X-ray medical image acquisition device and acquisition method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85106837A (en) * | 1985-09-10 | 1987-03-11 | 老代尔夫特光学工业有限公司 | Slit X-ray photographic equipment |
| CN1685447A (en) * | 2002-09-26 | 2005-10-19 | 西门子公司 | Overlay device and computer tomography device comprising an emitter side overlay device |
| CN1851832A (en) * | 2005-04-22 | 2006-10-25 | 西门子公司 | Diaphragm device for sweeping x-ray apparatus of object and method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008049708B4 (en) | 2008-09-30 | 2011-03-17 | Siemens Aktiengesellschaft | Aperture and diaphragm device for the targeted influence of X-radiation |
-
2013
- 2013-07-31 DE DE102013215042.3A patent/DE102013215042B4/en active Active
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2014
- 2014-07-29 BR BR102014018632A patent/BR102014018632A2/en not_active IP Right Cessation
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85106837A (en) * | 1985-09-10 | 1987-03-11 | 老代尔夫特光学工业有限公司 | Slit X-ray photographic equipment |
| CN1685447A (en) * | 2002-09-26 | 2005-10-19 | 西门子公司 | Overlay device and computer tomography device comprising an emitter side overlay device |
| CN1851832A (en) * | 2005-04-22 | 2006-10-25 | 西门子公司 | Diaphragm device for sweeping x-ray apparatus of object and method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102013215042A1 (en) | 2015-02-05 |
| DE102013215042B4 (en) | 2021-09-16 |
| BR102014018632A2 (en) | 2015-09-29 |
| CN104337540A (en) | 2015-02-11 |
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