CN103298405B - For following the tracks of the computed tomography systems and method injected - Google Patents
For following the tracks of the computed tomography systems and method injected Download PDFInfo
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- 238000002591 computed tomography Methods 0.000 title claims abstract description 23
- 230000000052 comparative effect Effects 0.000 claims abstract description 9
- 230000001276 controlling effect Effects 0.000 claims abstract description 3
- 239000002872 contrast media Substances 0.000 abstract description 14
- 239000000463 material Substances 0.000 abstract description 2
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- 238000004590 computer program Methods 0.000 description 7
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- 230000000875 corresponding Effects 0.000 description 4
- 238000003325 tomography Methods 0.000 description 4
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- 210000004072 Lung Anatomy 0.000 description 2
- 210000002784 Stomach Anatomy 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000000968 intestinal Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000152 swallowing Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 210000000709 Aorta Anatomy 0.000 description 1
- 210000004556 Brain Anatomy 0.000 description 1
- 210000000481 Breast Anatomy 0.000 description 1
- 210000003205 Muscles Anatomy 0.000 description 1
- 210000001147 Pulmonary Artery Anatomy 0.000 description 1
- 210000002356 Skeleton Anatomy 0.000 description 1
- 210000003462 Veins Anatomy 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004422 calculation algorithm Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010968 computed tomography angiography Methods 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
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- 238000001990 intravenous administration Methods 0.000 description 1
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Abstract
The present invention relates to a kind of computed tomography systems (10) and a kind of method of correspondence, described system and method can be followed the tracks of contrast agent material and injects and relate to the radiation dose reduced.The computed tomography systems (10) proposed including: includes x-ray source (18) and the collecting unit of X-ray detector (30), and described collecting unit is used for acquired projections data set (42,44,46)；Reconstruction unit (41), described reconstruction unit (41) is for from the first data for projection collection (42) Relouilding plan image (48)；Recognition unit (52), described recognition unit (52) is used for identifying the area-of-interest (40) in described planning chart picture (48)；Selecting unit (54), described selection unit (54) is for selecting the projected angle (60) by described area-of-interest (40)；Computer (62), described computer (62) calculates target projection value (64) for the projection with selected projected angle (60) for described area-of-interest (40)；Control unit (32), described control unit (32) is for controlling the described collecting unit data for projection collection (44) with collection the second reduction, and the described second data for projection collection (44) reduced includes the data for projection of the projection with selected projected angle (60) from described area-of-interest (40)；And comparator (68), described comparator (68) is for comparing the projection value of described second data for projection collection (44) and described target projection value (64), wherein, described control unit (32) is suitable to control described collecting unit to start gather the 3rd data for projection collection (46) and be suitable to rebuild diagnostic image (50) from described 3rd data for projection collection (46) based on comparative result (70).
Description
Technical field
The present invention relates to a kind of computer tomography (CT) system, described computer tomography (CT)
System is injected specifically for following the tracks of.The invention still further relates to specifically for a kind of correspondence in this CT system
Method, computer program and processor.
Background technology
Injecting that to follow the tracks of be method conventional in CT angiography, it is used for determining and is injected into peripheral vein
In the contrast agent that flows into arrive the time at organ.This formation method is mainly for generation of the figure of tremulous pulse
Picture, such as aorta, pulmonary artery, brain and carotid image.
Known to inject tracking and gather thin image plate and use multiple short scanning by it periodically the most more
Newly.Monitoring image intensity in user defines region, and when reaching predefined intensity level,
This shows to inject and has had arrived at target area, thus starts diagnostic image acquisition.This method is only
Find out correct time started of collection, it is necessary to consume the x-ray dose of significant quantity.
US7054406 proposes by by for having been injected into the patient of contrast agent, performing low dose X-ray
The X-ray feed unit of scanning and high dose X-ray scanning is included in computed tomography systems,
Reduce radiation dose.Rebuild the X-ray projection data collected with for low-dose scanning and high dose
Scanning generates view data.In the low-dose scanning scanned prior to high dose, obtain multiple figures continuously
Picture, wherein, arranges ROI(region of interest at given position).CT value computing unit is in the roi
Continuous plus CT value, and the CT value calculated shows with density-time curve.Operator sees
Examine contrast agent and flow into the state of ROI, and determine the time point that high dose X-ray scanning starts.
Although compared to only gathering normal (high dose) X-ray scanning, US7054406 decreases trouble
Person's radiation dose, but this system still relates to being only used for it is determined that when start high dose X-ray and sweep
The sizable radiation dose retouched.Accordingly, it would be desirable to relate to pushing away of the radioactive exposure of the minimizing for patient
Note follows the tracks of apparatus and method.
Summary of the invention
It is an object of the present invention to provide a kind of computed tomography systems and method, described system and side
Method can follow the tracks of the amount of the minimizing injecting and relating to the radioactive exposure for patient.Another of the present invention
Individual target is to provide processor and the computer program of a kind of correspondence.
In a first aspect of the present invention, present a kind of computed tomography systems, described system
Including:
-including the collecting unit of x-ray source and X-ray detector, it is used for acquired projections data set,
-reconstruction unit, it is for from the first data for projection collection Relouilding plan image,
-recognition unit, it is for identifying the area-of-interest in described planning chart picture,
-selecting unit, it is for selecting the projected angle by described area-of-interest,
-computer, it is for the projection meter with selected projected angle for described area-of-interest
Calculate target projection value,
-control unit, it is for controlling the described collecting unit data for projection collection with collection the second reduction,
The described second data for projection collection reduced includes having selected projection from described area-of-interest
The data for projection of the projection at angle, and
-comparator, it is for comparing the projection value of described second data for projection collection and described target projection value,
Wherein, described control unit is suitable to control described collecting unit to start to gather based on comparative result
3rd data for projection collection and be suitable to from described 3rd data for projection collection rebuild diagnostic image.
In a still further aspect thereof, present a kind of in computed tomography systems with
The corresponding method that track is injected, described method comprises the steps:
-gather the first data for projection collection and from described first data for projection collection Relouilding plan image,
-identify the area-of-interest in described planning chart picture,
-select the projected angle by described area-of-interest,
-for described area-of-interest have selected projected angle projection calculate target projection value,
-gathering the second data for projection collection reduced, the described second data for projection collection reduced includes from institute
State the data for projection of the projection of area-of-interest,
The projection value of the-the most described second data for projection collection reduced and described target projection value, and
-gather the 3rd data for projection collection and rebuild diagnostic image from described 3rd data for projection collection,
Wherein, start to gather described 3rd data for projection collection based on comparative result.
In a still further aspect thereof, it is provided that a kind of place in computed tomography systems
Reason device, described processor is configured to control described computed tomography systems to perform following steps:
-gather the first data for projection collection and from described first data for projection collection Relouilding plan image,
-allow user to identify the area-of-interest in described planning chart picture,
-allow user to select the projected angle by described area-of-interest,
-for described area-of-interest have selected projected angle projection calculate target projection value,
-gathering the second data for projection collection reduced, the described second data for projection collection reduced includes from institute
State the data for projection of the projection of area-of-interest,
The projection value of the-the most described second data for projection collection reduced and described target projection value, and
-gather the 3rd data for projection collection and rebuild diagnostic image from described 3rd data for projection collection,
Wherein, start to gather described 3rd data for projection collection based on comparative result.
In still yet another aspect of the present, it is provided that a kind of computer program including code modules,
Described code modules is used for, and when performing described computer program on computers, makes computer
Control computed tomography systems to perform the step of described processor.
Define the preferred embodiments of the present invention in the dependent claims.Should be appreciated that and stated
Method, processor have similar with computer program with the system stated in dependent claims and define
And/or identical preferred embodiment.
The present invention proposes only to gather a thin image plate (the i.e. second data for projection collection) for scanning rule
Draw, and the most only determine inject the time of advent from single X-ray projection.Owing to Modern X-ray is adopted
Collection unit, the pipe of such as grid switch, it is allowed to gather single projection, so need not gather the shortest
Scanning.On the contrary, this be enough to gather a synoptic diagram picture (that is, from described first data for projection collection
Planning chart picture) and identify area-of-interest therein (ROI).Afterwards can be subtracting through ROI
Little set of projections (the most described second data for projection collection) is followed the tracks of the arrival injected.
The set of projections of described reduction can be only a projection, i.e. corresponding to (general at detector
Multiple detector elements including the array being arranged to row and column) single detecting element in obtain strong
Degree (counting rate).Or, it also is able in (the most adjacent) some detecting elements acquisition
(weighting) of intensity (counting rate) and.
Inventors realized that, inject arrival target area to follow the tracks of, generally by target area (ROI)
The collection of single projection be enough, and this causes the drastically minimizing of x-ray dose.Such as,
Known method can be from 10 images of 10 short-scan reconstruction, and it scans every time and is directed to 1500 throwings
Shadow, thus cause the collection of 15000 projections on the whole.By according to method of the present invention,
Only need the shortest scanning (the first data for projection collection) and 10 single projection (the second data for projection collection),
Thus produce 1500+10 × 1=1510 projection.
In a preferred embodiment, the described second data for projection collection reduced only includes from described interested
The data for projection of the projection with selected projected angle in region.Which reduce number of projections (and
Therefore radiation dose is decreased), and optimize the degree of accuracy of target following simultaneously.It is desirable that institute
The projected angle selected makes to be likely to absorb the structure of contrast agent also in projection line almost without other.
In another preferred embodiment, described recognition unit includes first user interface, and described first uses
Family interface allows user to identify the ROI in described planning chart picture.Generally, described first user interface bag
Including display, described display is for showing planning chart picture and user's input of reconstruction, and this allows user
Identify ROI.Described user input can be, such as, computer mouse, described computer mouse is permitted
Permitted to draw area-of-interest, or touch screen in the picture.Described user interface can require ROI
There is given shape, the most circular or spherical.Or, user can draw arbitrary shape.Once use
Family identifies ROI, it becomes possible to be shown as the border of ROI being covered by described planning chart picture.This allows
User verifies accurate location.
In a preferred embodiment, described selection unit includes that the second user interface, described second user connect
Mouth allows user to select the described projected angle by described area-of-interest.Described second user interface energy
Enough and described first user interface shares element, the most both can include identical display.Institute
State the second user interface and include the user's input for identifying described projected angle.For instance, it is possible to make to use tricks
The roller of calculation machine mouse rotates the projection corresponding to different projected angles over the display.Described second uses
Family interface guarantees that described projection is all the time through ROI.Described projected angle is selected generally to only relate to a freedom
Degree, because described projection can only be rotated within transverse section.But, in principle, the second user connects
Mouth allows user to tilt described projection so that it no longer embeds also is feasible in transverse section.
In another embodiment of proposed system, described selection unit is suitable to automatically select preferably throwing
Shadow angle, and described display is suitable to show described preferred projected angle.Automatically select described projected angle
Allow for the clinical workflow improved.It is typically chosen described projected angle thus passes through described mesh
Mark region, but it is not passed through other organs or the bodily tissue also being able to absorb contrast agent.Experienced doctor
Life knows which other region of target external will not have contrast agent washes.But, in some feelings
In condition, simple rule can be enough to determine suitable projection.For instance, it is possible to there is hypothesis below: at CT
The particular organization that can easily identify in image, such as skeleton (high radiodensity) or low-density lung group
Knit and generally will there is no contrast agent washes.In this case, described selection unit can automatically select excellent
Choosing projected angle and described preferred projected angle is displayed to the user that.To only need after experienced doctor
Confirm this selection.
In another embodiment, described selection unit is suitable to automatically select described projected angle.If it is described
Unit is selected to use sufficiently exact algorithm for determining described projected angle, then to this allow that even
The workflow more improved, because typically need not mutual, except the knowledge of such ROI with user
Other: for the identification of described ROI, with user be alternately preferably (although the side of automatically selecting of ROI
Method is also feasible, such as, depends on user's input of expectation organ to be imaged, such as, passes through
Video procession module).
In another embodiment of proposed system, described selection unit is suitably selected for the projection more than
Angle, and described second reduce data for projection collection include having from the area-of-interest identified
The data for projection of the projection of the projected angle selected more than.Such as, if can not find to be not passed through
Can also produce the single projection of its hetero-organization of contrast agent washes, using more than a projected angle is to have
?.If a projection individually produces the signal that noise is excessive, have and also can more than a projected angle
It is enough useful.Described can be contained in identical transverse section more than a projected angle, or they
Can tilt with different angles.If the described projected angle that user selects does not corresponds precisely to radiation source
And a line between detector, then described system also is able to select more than a projected angle.
In another embodiment of the invention, described collecting unit is suitable to gather described the at follow-up time
The projection value of two data for projection collection, and described comparator is suitable to calculate the throwing that gathered at follow-up time
The rate of change of shadow value.This has the advantage that injecting arrival target is not based on intensity in target
The threshold value of absolute increase, but based on being compared to previously acquired projection value, the relative change of projection value
Change.The embodiment of refinement also is able to the throwing of the projection value being compared to for described planning image acquisition
The requirement of shadow value absolute increase be compared to before time point gather at time point described the
The growth of the projection value of two data for projection collection is combined.This is capable of the more accurate of target time of advent
Identify.
In another embodiment, when described collecting unit is suitable to equal between follow-up time is with each time
Between interval gather described second data for projection collection projection value.Can be based on the contrast agent used and expection
Arrival target selection of time described in time interval.
In another preferred embodiment, described collecting unit also includes dynamic collimation device, described dynamic standard
Straight device for shrinking the X-ray launched from described x-ray source when gathering described second data for projection collection
Bundle.This has the advantage that the projection line that radiant flux is only restricted in selection, and this reduces further
Radiation dose for patient.And, even if ROI is the least, it is also possible to will be the thinnest more accurately
X-ray beam location through ROI.
In another embodiment, described collecting unit is adapted in use to the x-ray source of grid switch to gather institute
State the second data for projection collection.The pipe permission single projected angle of collection of grid switch, rather than angular segments, i.e.
The ring including radiation source and detector cells is made to rotate continuously in gatherer process high speed.
Accompanying drawing explanation
These and other aspects of the present invention will become apparent and quilt with reference to the embodiments described below
Illustrate.In the following figures:
Fig. 1 shows the schematic perspective views of the computed tomography systems according to the present invention,
Fig. 2 A and Fig. 2 B shows the viewgraph of cross-section of this computed tomography systems,
Fig. 3 shows the flow chart of the method according to the invention,
Fig. 4 shows the general block diagram of the computed tomography systems according to the present invention, and
Fig. 5 shows as by the computed tomography systems collection according to the present invention and the meter of reconstruction
The example of calculation machine tomography planning chart picture.
Detailed description of the invention
Computed tomography systems 10 shown in Fig. 1,2A and 2B includes frame 12, frame 12
(and can be perpendicular to Fig. 2 A's and Fig. 2 B around the z direction being parallel to the coordinate system shown in Fig. 1
Plotting planes) rotary shaft 14 that extends rotates.To this end, described frame by motor 16 with preferably
Constant but adjustable speed drives.Described frame is provided with radiation source 18, such as X-ray
Source.This x-ray source is connected to the collimator arrangement 20 that make use of aperture to arrange especially, thus shape
Become to carry out the cone shaped radiation bundle 28 of radiation that free radiation source 18 produces, i.e. in the direction of z-axis and
It is perpendicular in the direction of z-axis (that is, in the plane being perpendicular to rotary shaft 14) have than 0
The radiant flux 28 of finite dimensional.
Described radiant flux irradiation inspection area 22, the object 24(being arranged on the platform top 26 of patient table is not
Illustrate), such as patient, may be located in inspection area 22.Inspection area 22 is fashioned into cylinder,
By the aperture angle of radiant flux 28, its diameter determines that (angular aperture is understood to, by the position of radiant flux 28
In the ray at the edge of the plane being perpendicular to rotary shaft 14, relative to by radiation source S and described rotary shaft
The angle that the plane of definition surrounds).
Behind inspection area 22, X-ray beam 28 incides on two-dimensional detector 30, two-dimensional detection
Device 30 attaches to frame 12 and includes multiple detector row, and each detector row includes multiple detection
Device element 31.Described detector row is disposed in the plane being perpendicular to rotary shaft 14, preferably arranges
On the circular arc around radiation source 18.But, they can also be formed in a different manner；Such as,
They can be depicted around the circular arc of rotary shaft 14 or for straight line.By radiant flux 28 hit every
Individual detector element 31 provides measurement for the ray of the radiant flux 28 in each position of radiation source 18
Value.The most also the collection of this measured value is referred to as data for projection collection.Data for projection collection includes by one
Or the measured value that multiple detector element 31 gathers at one or more projected angles.
X-ray source 18 forms collecting unit together with detector 30.Detector 18 generally also includes using
Device in the data for projection that storage gathers.Such memory device can be included in detector 30
Or (preferably) it is provided as outside independent memory element 34 as shown in Figure 1.
By motor (not shown), it is possible to make inspection area 22 or platform top 26 be parallel to rotary shaft 14
Or be parallel to z-axis and move.By another motor (not shown), it is possible to the height on regulating platform top 26.
Fig. 2 A shows the preferred embodiment of proposed CT system, wherein, described collecting unit
For collection first and the 3rd data for projection collection.Collimator arrangement 20 is set so that radiant flux 28
Arrive all detector elements of detector 30.
Fig. 2 B shows identical CT system, wherein, collimator arrangement 20 is set so that
It shrinks radiant flux 28 ' to produce such effect: radiant flux 28 ' can only arrive of detector 30
Detector element 31.It is also possible that arrange collimator arrangement 20, so that ROI40 at least portion
Divide in radiant flux 28 '.Collimator arrangement 20 is dynamic, it means that it can be promptly at width
And between narrow radiant flux 28 change.Therefore can after acquiring described first data for projection collection
Promptly gather the described second data for projection collection reduced.
But, in an alternative embodiment, CT system does not use this collimator arrangement that can switch, and
It is that collimator has fixing setting (or not using collimator), so that all data for projection
Collection is generally gathered by radiant flux 28, as shown in Figure 2 A.
In order to locate the multiple data for projection collection that collecting unit described in reason gathers, it is provided that processing unit 36.
Will be explained below explaining the process of described processing unit 36.Display unit 38 shows reconstruction
Image or image section.
Fig. 3 shows the flow chart of the general embodiments of the method according to the invention.Fig. 4 shows root
The general block diagram of processing unit 36 according to the computed tomography systems 10 of the present invention.In the first step
In rapid S10, described collecting unit gathers the first data for projection collection 42(and is such as stored in memory element 34
In), the first data for projection collection 42 is rebuild to obtain planning chart as 48 by reconstruction unit 41.Planning chart picture
48 by recognition unit 52 and select unit 54 to use.In this embodiment, recognition unit 52 includes
First user interface 56, and select unit 54 to include the second user interface 58.In this embodiment
In, such as on display 38, planning chart is shown to user as 48.Specifically, in step
In S12, preferably by first user interface 56, known by recognition unit 52 in planning chart is as 48
Other ROI40.In step S14, preferably by the second user interface 58, by selecting unit 54
Select the projected angle 60 through ROI40.
The first and second user interfaces 56,58, recognition unit 52 and/or selection unit 54 is replaced also may be used
To include self-winding parts, described self-winding parts or proposition area-of-interest 40 and/or projected angle 60,
The area-of-interest 40 and/or the projected angle 60 that are proposed are shown to user as suggestion, and/or for thin
Change the ROI40 and/or projected angle 60 selected by user.
It follows that in step s 16, computer 62 based on planning chart as 48, ROI40, projected angle
60 and, it is preferable that the expection increase of the mean intensity of ROI40 determines target projection value 64.?
In one embodiment, computer 62 calculates target by being calculated through planning chart as the line integral of 48
Projection value 64, the intensity in ROI40 is arranged to the intensity increased there.Integration is along projection
66 (if the computer tomography planning chart of Fig. 5 description is as shown in the example of 48) performed.
After described collecting unit, (step S18) gathers the data for projection collection 44(of the second reduction and sees
Fig. 2 B), such as only one of which measured value passes the throwing of ROI40 corresponding to the projected angle 60 to select
Shadow.
Comparator 68 compare (step S20) from the second data for projection collection 44 projection value with by calculating
The target projection value 64 that device 62 calculates.This result of the comparison can be based simply on from the second projection number
When it is more than target projection value 64 according to the projection value of collection 44 collection.But, as previously mentioned, it is also possible to have
The comparison more refined.Such as, condition can be, the projection value gathered from the second data for projection collection 44 is big
In target projection value 64 and the projection value that gathers at current point in time higher than previously acquired projection value.
Refinement can need in the minimum from the projection value that the second data for projection collection 44 gathers subsequently tiltedly further
Rate.
Comparative result 70 based on comparator 68, control unit 32 starts (step S22) and gathers
Three data for projection collection 46 and rebuild diagnostic image 50 from described 3rd data for projection collection 46.In display
On device 38, diagnostic image 50 is shown to user.
Fig. 5 show for the planning chart identifying ROI40 and described projected angle as 48 example.Should
Image shows the cross section of human breast.It can be seen that the part 76 of heart 72, spinal column 74, lung
With rib 78.ROI40 and (at specific projected angle) projection 66 are shown as covering at planning chart
On 48, similar to what it can show on the first and second user interfaces 56,58.Can see
Go out projection 66 and pass ROI40, and expection will not produce the structure 74,76,78 of contrast agent washes.
The present invention can follow the tracks of another medium injecting or producing in x-ray imaging contrast.Following the tracks of
During stage, the projection reduced by collection according to the computed tomography systems 10 of the present invention
Radioactive exposure for patient is minimized by data set 44.Being based on, such as, instruction is injected
Arrive the comparison to projection value in target area 40, start to gather and rebuild diagnostic image 50.
To injecting or other contrast agent are used and generally by injection or performed by swallowing.Can example
As intravenous, muscle, intrathecally or hypodermically perform injection.For stomach or the inspection of intestinal, energy
Enough perform to use simply by swallowing medium.Inject or other contrast agent can be included in X-ray
Image generates any kind of material of contrast.Can be by doctor, medical assistant, ordinary skill people
Member or sufferers themselves carry out it and use.
The present invention, except following the tracks of injecting of contrast agent, it is also possible to is applied to follow the tracks of other things in experimenter
The distribution of matter.Such as, it may be used for observing the generation in the picture that predetermined substance, such as people are swallowed
How soon the food fully contrasted or medicine, can arrive ad-hoc location in stomach or intestinal.
Although in accompanying drawing and description above, illustrate and describe in detail the present invention, but such
It is considered as illustrative or exemplary for illustrating and describing, and nonrestrictive；The invention is not restricted to public affairs
The embodiment opened.By research accompanying drawing, disclosure and claims, those skilled in the art exists
Practice stated the present invention time it will be appreciated that and realize disclosed embodiment other change.
In the claims, word " includes " being not excluded for other elements or step, indefinite article " "
Or " one " is not excluded for multiple.Discrete component or other unit can complete to enumerate in claim
The function of some projects.Enumerate the simple fact of certain measures in mutually different dependent claims
Do not indicate that the combination that these measures be cannot be used to advantage.
Can store and/or distributed computer program on suitable non-state medium, described non-transient state is situated between
Matter such as provide together with other hardware or as other hardware part provide optical storage medium or
Solid state medium, but described computer program can also be distributed otherwise, such as via the Internet,
Or other wired or wireless communication systems.
Any reference in claim is not necessarily to be construed as restriction scope.
Claims (14)
1. a computed tomography systems (10), comprising:
-including x-ray source (18) and the collecting unit of X-ray detector (30), it is used for adopting
Ji Touyingshuojuji (42,44,46),
-reconstruction unit (41), it is for from the first data for projection collection (42) Relouilding plan image (48),
-recognition unit (52), it is used for identifying the area-of-interest (40) in described planning chart picture (48),
-selecting unit (54), it is for selecting the projected angle (60) by described area-of-interest (40),
-computer (62), it is for having selected throwing for described area-of-interest (40)
The projection at shadow angle (60) calculates target projection value (64),
-control unit (32), it is for controlling described collecting unit to gather the projection number of the second reduction
According to collection (44), the described second data for projection collection (44) reduced includes from described area-of-interest (40)
The data for projection of the projection with selected projected angle (60), and
-comparator (68), it is for the projection of the most described second data for projection collection (44) reduced
Value and described target projection value (64),
Wherein, described control unit (32) is suitable to control described collecting unit with based on comparative result (70)
Start gather the 3rd data for projection collection (46) and be suitable to from described 3rd data for projection collection (46) weight
Build diagnostic image (50).
System the most according to claim 1, wherein, the described second data for projection collection (44) reduced
Only include the projection with selected projected angle (60) from described area-of-interest (40)
Data for projection.
System the most according to claim 1, wherein, described recognition unit (52) includes first
User interface (56), described first user interface (56) allows user to identify described planning chart picture (48)
In described area-of-interest (40).
System the most according to claim 1, wherein, described selection unit (54) includes second
User interface (58), described second user interface (58) allows user to select by described region of interest
The described projected angle (60) in territory (40).
System the most according to claim 4, it also includes display (38), wherein, described
Unit (54) is selected to be suitable to automatically select preferred projected angle, and wherein, described display (38)
Be suitable to show described preferred projected angle.
System the most according to claim 1, wherein, described selection unit (54) is suitable to automatically
Select described projected angle (60).
System the most according to claim 1, wherein, described selection unit (54) is suitably selected for
More than a projected angle (60), and wherein, the described second data for projection collection (44) reduced includes
The projected angle (60) selected more than one of having from the area-of-interest (40) identified
The data for projection of projection.
System the most according to claim 1, wherein, described collecting unit is suitable at follow-up time
Gather the described projection value of the described second data for projection collection (44) reduced, and described comparator (68)
Be suitable to calculate the rate of change of the projection value gathered at follow-up time.
System the most according to claim 7, wherein, described collecting unit is suitable at follow-up time
The described of the described second data for projection collection (44) reduced is gathered with time interval equal between each time
Projection value.
System the most according to claim 1, wherein, described collecting unit also includes dynamic standard
Straight device (20), described dynamic collimation device (20) is for gathering the described second data for projection collection reduced
(44) X-ray beam (28 ') launched from described x-ray source (18) is shunk time.
11. systems according to claim 1, described collecting unit is adapted in use to grid switch
X-ray source (18) gathers the described second data for projection collection (44) reduced.
12. 1 kinds of methods injected for tracking in computed tomography systems (10), its bag
Include:
-gather (S10) the first data for projection collection (42) and from described first data for projection collection (42)
Relouilding plan image (48),
-identify the area-of-interest (40) in (S12) described planning chart picture (48),
-select (S14) projected angle (60) by described area-of-interest (40),
-for described area-of-interest (40) have selected projected angle (60) projection calculate
(S16) target projection value (64),
-gather the data for projection collection (44) that (S18) second reduces, the described second data for projection reduced
Collection (44) includes the data for projection of the projection from described area-of-interest (40),
-compare the projection value of the data for projection collection (44) that (S20) described second reduces and described target
Projection value (64), and
-gather (S22) the 3rd data for projection collection (46) and from described 3rd data for projection collection (46)
Rebuild diagnostic image (50),
Wherein, start to gather described 3rd data for projection collection (46) based on comparative result (70).
13. 1 kinds of processors in computed tomography systems (10), it is configured to control
Make described computed tomography systems (10) to perform following steps:
-gather (S10) the first data for projection collection (42) and from described first data for projection collection (42)
Relouilding plan image (48),
-allow user to identify the area-of-interest (40) in (S12) described planning chart picture (48),
-allow user to select (S14) projected angle (60) by described area-of-interest (40),
-for described area-of-interest (40) have selected projected angle (60) projection calculate
(S16) target projection value (64),
-gather the data for projection collection (44) that (S18) second reduces, the described second data for projection reduced
Collection (44) includes the data for projection of the projection from described area-of-interest (40),
-compare the projection value of the data for projection collection (44) that (S20) described second reduces and described target
Projection value (64), and
-gather (S22) the 3rd data for projection collection (46) and from described 3rd data for projection collection (46)
Rebuild diagnostic image (50),
Wherein, start to gather described 3rd data for projection collection (46) based on comparative result (70).
14. 1 kinds of devices injected for tracking in computed tomography systems (10), including:
-be used for gathering (S10) the first data for projection collection (42) and from described first data for projection collection
(42) module of Relouilding plan image (48),
-it is used for identifying the module of the area-of-interest (40) in (S12) described planning chart picture (48),
-it is used for selecting the module of (S14) projected angle (60) by described area-of-interest (40),
-for the projection with selected projected angle (60) for described area-of-interest (40)
Calculate the module of (S16) target projection value (64),
-it is used for gathering the data for projection collection (44) that (S18) second reduces, the described second projection reduced
Data set (44) includes the module of the data for projection of the projection from described area-of-interest (40),
-be used for comparing the projection value of the data for projection collection (44) that (S20) described second reduces with described
The module of target projection value (64), and
-be used for gathering (S22) the 3rd data for projection collection (46) and from described 3rd data for projection collection
(46) module of diagnostic image (50) is rebuild,
Wherein, start to gather described 3rd data for projection collection (46) based on comparative result (70).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP11150301.7 | 2011-01-06 | ||
| EP11150301 | 2011-01-06 | ||
| PCT/IB2012/050042 WO2012093364A1 (en) | 2011-01-06 | 2012-01-04 | Computed tomography system and method for tracking a bolus |
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| CN103298405B true CN103298405B (en) | 2016-11-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101204330A (en) * | 2006-12-18 | 2008-06-25 | Ge医疗系统环球技术有限公司 | X-ray CT equipment |
| CN101502422A (en) * | 2008-02-07 | 2009-08-12 | 株式会社东芝 | X-ray CT apparatus and tomography method |
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101204330A (en) * | 2006-12-18 | 2008-06-25 | Ge医疗系统环球技术有限公司 | X-ray CT equipment |
| CN101502422A (en) * | 2008-02-07 | 2009-08-12 | 株式会社东芝 | X-ray CT apparatus and tomography method |
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