CN104739431B - Determine the method and ct apparatus of exposure range - Google Patents
Determine the method and ct apparatus of exposure range Download PDFInfo
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- CN104739431B CN104739431B CN201310751370.4A CN201310751370A CN104739431B CN 104739431 B CN104739431 B CN 104739431B CN 201310751370 A CN201310751370 A CN 201310751370A CN 104739431 B CN104739431 B CN 104739431B
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Abstract
The invention discloses a kind of method and correlation computer tomographic apparatus for determining exposure range in computed tomography.One embodiment of the invention provides a kind of method for determining exposure range in computed tomography, including：Determine scope of conservation area [θs, θe]；For ([θ beyond scope of conservation areae2 π, θs]) each radiation initial angle α0, according to region-of-interest, calculate the additional angle δ of radiation；Work as α0+π+δ≤θsWhen, mark δ is effectively to radiate additional angle；Exposure range is defined as [α0, min, α0, min+π+δmin], wherein δminFor the minimum additional angle of effectively radiation, α0, minFor δminCorresponding α0.By and region-of-interest imaging technique combination, the present invention can make that good balance can be obtained with the minimum of patient dose to the protection of doctor in the PCI that CT is guided.
Description
Technical field
The present invention relates to medical imaging, particularly computed tomography.
Background technology
CT guide PCI in, for reduction doctor receive radiation, when X-ray tube run to the hand of doctor
When usual position angle closes on, it can stop launching X-ray.Figure 1A to Fig. 1 C is a ct apparatus of prior art
It is turned on and off the schematic diagram of X-ray tube.The ct apparatus provides three optional models for closing X-ray tube
Enclose, respectively with 210 °, 270 °, 330 °Wei Qi centers, size is 100 °.The scope can be described as protection zone.But, protection zone is once
Setting cannot in real time change with the hand of doctor.
Chinese invention patent application CN102846332A and CN102846331A disclose one kind according to region-of-interest and to
Fixed radiation initial angle α0It is determined that calculating the additional angle δ of radiation method.According to this method, depending on the target to be imaged, X-ray
Exposure range be generally much less than 360 °, even less than 180 °.
The content of the invention
In view of this, the present invention proposes a kind of method and correlation computations for determining exposure range in computed tomography
Machine tomographic apparatus, to reduce the dose of radiation that person under inspection/patient and examiner/curer receive.
One embodiment of the invention provides a kind of method for determining exposure range in computed tomography, including：It is determined that
Scope of conservation area [θs, θe]；For ([θ beyond scope of conservation areae- 2 π, θs]) each radiation initial angle α0, according to region-of-interest,
Calculate the additional angle δ of radiation；Work as α0+π+δ≤θsWhen, mark δ is effectively to radiate additional angle；Exposure range is defined as [α0, min,
α0, min+π+δmin], wherein δminFor the minimum additional angle of effectively radiation, α0, minFor δminCorresponding α0。
In one embodiment of this invention, the determination scope of conservation area [θs, θe] be：Determine scope of conservation area center
Angle, θ；Determine scope of conservation area [θs, θe] beWherein ε is the size of protection zone.
One embodiment of the invention provides a kind of ct apparatus, including：One scope of conservation area determining unit,
Its determination scope of conservation area [θs, θe]；The one additional angle computing unit of radiation, it is for ([θ beyond scope of conservation areae- 2 π, θs])
Each radiation initial angle α0, according to region-of-interest, calculate the additional angle δ of radiation；One effectively radiates additional corner mark unit, and it works as α0+
π+δ≤θsWhen, mark δ is effectively to radiate additional angle；One exposure range determining unit, exposure range is defined as [α by it0, min,
α0, min+π+δmin], wherein δminFor the minimum additional angle of effectively radiation, α0, minFor δminCorresponding α0。
In one embodiment of this invention, the scope of conservation area determining unit is used for：Determine scope of conservation area center
Angle, θ；Determine scope of conservation area [θs, θe] beWherein ε is the size of protection zone.
By and region-of-interest imaging technique combination, the present invention can make protection to doctor in the PCI that CT is guided
Good balance can be obtained with the minimum of patient dose.Moreover, have to the real-time capture of examiner/curer motion and by
The region-of-interest scanning algorithm of limit, the method and correlation computer of exposure range are broken in determination computed tomography of the invention
Layer scanning can provide more flexible operation experience, and provide more preferable guarantor for person under inspection/patient and examiner/curer
Shield.
Brief description of the drawings
The preferred embodiments of the present invention will be described in detail by referring to accompanying drawing below, and make one of ordinary skill in the art more
In the above and other feature and advantage of the clear present invention, accompanying drawing：
Figure 1A to Fig. 1 C is turned on and off the schematic diagram of X-ray tube for a ct apparatus of prior art.
Fig. 2 is the schematic flow sheet of the method for the computed tomography according to the first embodiment of the present invention.
Fig. 3 A are the structural representation of the ct apparatus according to the second embodiment of the present invention.
Fig. 3 B are the functional block diagram of the ct apparatus shown in Fig. 3 A.
In above-mentioned accompanying drawing, the reference used is as follows：
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, by the following examples to of the invention further detailed
Describe in detail bright.
Fig. 2 is the schematic flow sheet of the method 200 of the computed tomography according to the first embodiment of the present invention.Calculate
The method 200 of machine tomoscan includes the method 211 for determining exposure range in computed tomography.Computed tomography
Method 200 may include：
S201：Start.
S202：Full dose scan and reconstruction.
S203：Obtain benchmark image；
S204：Detect the image of protection zone and determine the angle, θ at scope of conservation area center.For example, can be given by camera
Protection zone is taken pictures, after image procossing, determines the angle, θ at scope of conservation area center.Where protection zone can be the hand of doctor
Region.
S206：Determine scope of conservation area [θs, θe].For example, it may be determined that scope of conservation area [θs, θe] be
Wherein ε is the size of protection zone.
S208：For ([θ beyond scope of conservation areae- 2 π, θs]) each radiation initial angle α0, according to region-of-interest, calculate
Radiate additional angle δ.Chinese invention patent application CN102846332A and CN102846331A disclose one kind according to region-of-interest
With given radiation initial angle α0The method for calculating the additional angle δ of radiation, will not be repeated here.
S209：Work as α0+π+δ≤θsWhen, mark δ is effectively to radiate additional angle；
S210：Exposure range is defined as [α0, min, α0, min+π+δmin], wherein δminAdded for minimum effective radiation
Angle, α0, minFor δminCorresponding α0。
S212：Region-of-interest is scanned and rebuild.
S216：Judge whether to terminate scanning：If so, then performing S218；If it is not, then jumping to S204.
S218：Terminate.
Determining the method 211 of exposure range in computed tomography includes step S206, S208, S209 and S210.
Alternatively, the method 200 of computed tomography may also include S214：The figure obtained is rebuild according to region-of-interest
Picture, updates benchmark image.Using the benchmark image after updating in the scanning of next region-of-interest, the dosage of scanning can be reduced.
Fig. 3 A are the structural representation of the ct apparatus 300 according to the second embodiment of the present invention, Fig. 3 B
For the functional block diagram of the ct apparatus 300 shown in Fig. 3 A.In the present embodiment, ct apparatus
300 include a frame 301, a camera 307, a main frame 303 and a sick bed 305.As shown in Figure 3 B, computed tomography is set
Standby 300, which include the additional angle computing unit 308, one of a scope of conservation area determining unit 306, one radiation, effectively radiates additional corner mark
The exposure range determining unit 310 of unit 309 and one.Scope of conservation area determining unit 306, radiate additional angle computing unit 308, have
The function of the additional corner mark unit 309 of effect radiation and exposure range determining unit 310 can be by one or more of main frame 303
Device is managed to perform.
Camera 307 is used to detect the image of protection zone and sends image to main frame 303.Main frame 303 is according to the image
Determine the angle, θ at scope of conservation area center.Protection zone can be the region where the hand of doctor.
Scope of conservation area determining unit 306 determines scope of conservation area [θs, θe].In the present embodiment, for example, it may be determined that protecting
Protect area scope [θs, θe] beWherein ε is the size of protection zone.
Additional angle computing unit 308 is radiated for ([θ beyond scope of conservation areae- 2 π, θs]) each radiation initial angle α0, root
According to region-of-interest, the additional angle δ of radiation is calculated.Chinese invention patent application CN102846332A and CN102846331A disclose one
Plant according to region-of-interest and given radiation initial angle α0The method for calculating the additional angle δ of radiation, will not be repeated here.
Effectively radiate additional corner mark unit 309 and work as α0+π+δ≤θsWhen, mark δ is effectively to radiate additional angle.
Exposure range is defined as [α by exposure range determining unit 3100, min, α0, min+π+δmin], wherein δminTo be minimum
Effectively radiate additional angle, α0, minFor δminCorresponding α0。
Ct apparatus 300 can carry out region-of-interest scanning and reconstruction according to exposure range.
By and region-of-interest imaging technique combination, can be with patient's agent to the protection of doctor in the PCI of CT guiding
The minimum of amount obtains good balance.Moreover, having the real-time capture to examiner/curer's motion and limited concern area
Domain scanning algorithm, the method and correlation computer tomoscan of exposure range can be carried in determination computed tomography of the invention
Experienced for more flexible operation, and more preferable protection is provided for person under inspection/patient and examiner/curer.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, all essences in the present invention
God is with principle, and any modifications, equivalent substitutions and improvements made etc. should be included within the scope of the present invention.
Claims (4)
1. a kind of method for determining exposure range in computed tomography, including：
Determine scope of conservation area [θs,θe]；
For each radiation initial angle α beyond scope of conservation area0, according to region-of-interest, calculate the additional angle δ of radiation；
Work as α0+π+δ≤θsWhen, mark δ is effectively to radiate additional angle；
Exposure range is defined as [α0,min, α0,min+π+δmin], wherein δminFor the minimum additional angle of effectively radiation, α0,minFor
δminCorresponding α0。
2. the method as described in claim 1, it is characterized in that, the determination scope of conservation area [θs,θe] be：
Determine the angle, θ at scope of conservation area center；
Determine scope of conservation area [θs,θe] beWherein ε is the size of protection zone.
3. a kind of ct apparatus, including：
One scope of conservation area determining unit, its determination scope of conservation area [θs,θe]；
The one additional angle computing unit of radiation, it is for each radiation initial angle α beyond scope of conservation area0, according to region-of-interest, meter
Calculate the additional angle δ of radiation；
One effectively radiates additional corner mark unit, and it works as α0+π+δ≤θsWhen, mark δ is effectively to radiate additional angle；
One exposure range determining unit, exposure range is defined as [α by it0,min, α0,min+π+δmin], wherein δminHave for minimum
The additional angle of effect radiation, α0,minFor δminCorresponding α0。
4. equipment as claimed in claim 3, it is characterized in that, the scope of conservation area determining unit is used for：Determine protection zone model
Enclose the angle, θ at center；Determine scope of conservation area [θs,θe] beWherein ε is the size of protection zone.
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| CN201310751370.4A CN104739431B (en) | 2013-12-31 | 2013-12-31 | Determine the method and ct apparatus of exposure range |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102648850B (en) * | 2011-02-28 | 2014-01-22 | 上海西门子医疗器械有限公司 | X-ray projection data collecting system |
| CN102835970B (en) * | 2011-06-22 | 2015-04-29 | 上海西门子医疗器械有限公司 | Computed tomography imaging method |
| CN102846332B (en) * | 2011-06-30 | 2015-04-29 | 上海西门子医疗器械有限公司 | X-ray computed tomography scanning system and method |
| CN102846331B (en) * | 2011-06-30 | 2015-04-08 | 上海西门子医疗器械有限公司 | X-ray computed tomography scanning system and method |
| CN103356218B (en) * | 2012-03-31 | 2015-06-24 | 上海西门子医疗器械有限公司 | Method and system for X-ray computed tomography |
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