CN106691488A - Spiral CT scanning and image-forming method and system - Google Patents
Spiral CT scanning and image-forming method and system Download PDFInfo
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- CN106691488A CN106691488A CN201710056929.XA CN201710056929A CN106691488A CN 106691488 A CN106691488 A CN 106691488A CN 201710056929 A CN201710056929 A CN 201710056929A CN 106691488 A CN106691488 A CN 106691488A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computerised tomographs
- A61B6/032—Transmission computed tomography [CT]
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/027—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis characterised by the use of a particular data acquisition trajectory, e.g. helical or spiral
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/40—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/42—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for detecting radiation specially adapted for radiation diagnosis
- A61B6/4208—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for detecting radiation specially adapted for radiation diagnosis characterised by using a particular type of detector
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/44—Constructional features of apparatus for radiation diagnosis
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/46—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with special arrangements for interfacing with the operator or the patient
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/52—Devices using data or image processing specially adapted for radiation diagnosis
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/54—Control of apparatus or devices for radiation diagnosis
Abstract
The embodiment of the invention provides a spiral CT scanning and image-forming method and system, and belongs to the technical field of CT scanning. The method comprises the following steps: controlling a detector and a ray source to perform primary spiral scanning motion and enabling a scanning rotary table to perform rotational motion; stopping motion of the ray source and the detector when the motion range of the detected ray source and the detector exceeds preset motion range; controlling the ray source and the detector to horizontally move by preset distance in the preset horizontal-moving direction, and setting starting time for secondary spiral scanning motion of the ray source and the detector according to the deflection angle of the scanning rotary table; controlling the ray source and the detector to perform secondary spiral scanning motion in a direction reverse to the preset motion direction; obtaining projection data by moving the ray source and the detector by N-1 preset distances in the preset horizontal moving direction; re-arranging the projection data; performing CT image re-construction on data, and realizing scanning on large objects through synchronous movement of the ray source and the detector. The spiral CT scanning and image-forming method reduces cost of the detector and improves scanning efficiency.
Description
Technical field
The present invention relates to CT scan technical field, in particular to a kind of CT scan imaging method and system.
Background technology
Be limited to the volume and cost of detector, the current main layout of large-scale high energy ICT equipment be still II generations,
In III generations or II+III generations, detector is substantially single row or multiple rows linear array detector, therefore detection efficiency is relatively low, detection
It is relatively costly.High energy CT is to reduce the crosstalk between detector, typically in radiographic source into first passing through one before detector
" tunnel type " collimater carries out ray collimation, because each probe unit has needed corresponding collimater, objectively
The problem that cause few unit length detector quantity, single detector high cost, large-scale integrated cannot be carried out.But not
In the case of increasing detection density, to improve the spatial resolution of CT, conventional method is to carry out physics interpolation (in scanning process
In, by the swing or the movement of object of detector, Multiple-Scan data are obtained, these data are then combined into a fan-beam
Data).Typically, the III of CT has scan efficiency higher for scan mode than II generations, but due to being laid out in III generations
Detector all standing testee is needed under mode, is thus resulted in detect that large-size workpiece needs many detections of arrangement single
Unit, directly results in equipment price rising.
Therefore, how to realize being scanned large-sized object by being synchronized with the movement for radiographic source and detector, so as to drop
The cost of low detector, improves scan efficiency, is current urgent problem.
The content of the invention
In view of this, the purpose of the embodiment of the present invention is to provide a kind of CT scan imaging method and system, its energy
The cost of detector is enough reduced, scan efficiency is improved.
In a first aspect, the embodiment of the invention provides a kind of CT scan imaging method, be applied to CT scan into
As system, the system includes radiographic source and detector, and the detector includes multiple probe units, the multiple probe unit
Set gradually along preset direction, the radiographic source is arranged at the radiographic source with the detector with the detector for detection
Between object to be scanned, scanning turntable be used for place the object to be scanned, methods described includes：Control the scanning turntable
Drive the object to be scanned to be rotated and control the radiographic source with the detector from default scanning start bit
Put carries out first time helical scanning movement to predetermined movement direction in a spiral manner around the object to be scanned；Described first
During secondary helical scanning movement, when the detection radiographic source exceeds the radiographic source and institute with the range of movement of the detector
When stating the predetermined movement scope of detector, stop the first time helical scanning movement of the radiographic source and the detector,
And obtain the data for projection of the detector collection during the first time helical scanning movement；Control the radiographic source and institute
State detector synchronous along default translation direction translation predeterminable range, according to the deflection angle of the scanning turntable, penetrated described in setting
The initial time of line source and second helical scanning movement of the detector；According to rising for second helical scanning movement
Time beginning, the control radiographic source is with the detector along the rightabout with the predetermined movement direction around described to be scanned
Object carries out second helical scanning movement in a spiral manner, and obtains institute during second helical scanning movement
State the data for projection of detector collection；Repeat the above steps, until the radiographic source is synchronous with the detector along described default
N-1 predeterminable range of translation direction movement, N is the n times helical scanning movement according to detection parameter determination, obtains the N
The data for projection of the detector collection during secondary helical scanning movement；To the n times helical scanning movement process for obtaining
Described in detector collection data for projection enter rearrangement, the data after being reset；CT is carried out to the data after the rearrangement
Image reconstruction.
Second aspect, the embodiment of the invention provides a kind of CT scan imaging system, the system include radiographic source,
Detector and master control set, the master control set are coupled with the radiographic source and the detector respectively；The master control set,
For controlling the scanning turntable to drive the object to be scanned to be rotated and control the radiographic source with the spy
Survey device carries out first to predetermined movement direction in a spiral manner from the default scanning starting position around the object to be scanned
Secondary helical scanning movement；The master control set, is additionally operable to during the first time helical scanning movement, is penetrated when described in detection
When the range of movement of line source and the detector is beyond predetermined movement scope of the radiographic source with the detector, stop described
The first time helical scanning movement of radiographic source and the detector, and during obtaining the first time helical scanning movement
The data for projection of the detector collection；The master control set, is additionally operable to control radiographic source edge synchronous with the detector
Default translation direction translation predeterminable range, according to the deflection angle of the scanning turntable, sets the radiographic source and the detection
The initial time of second helical scanning movement of device；The master control set, is additionally operable to be transported according to second helical scanning
Dynamic initial time, the control radiographic source is with the detector along the rightabout with the predetermined movement direction around described
Object to be scanned carries out second helical scanning movement in a spiral manner, and obtains second helical scanning movement mistake
The data for projection of the collection of detector described in journey；The master control set, is additionally operable to control the radiographic source same with the detector
Step is the n times helical scanning fortune according to detection parameter determination along described default N-1 predeterminable range of translation direction movement, N
It is dynamic, obtain the data for projection of the detector collection during the n times helical scanning movement；The master control set, is additionally operable to
Data for projection to the detector collection during the n times helical scanning movement of acquisition enters rearrangement, after being reset
Data；The master control set, is additionally operable to carry out CT image reconstructions to the data after the rearrangement.
The beneficial effect of the embodiment of the present invention is：
The embodiment of the present invention provides a kind of CT scan imaging method and system, is driven by controlling the scanning turntable
The object to be scanned is rotated and controls the radiographic source with the detector from the default scanning start bit
Put carries out first time helical scanning movement to predetermined movement direction in a spiral manner around the object to be scanned, so as to described
During first time helical scanning movement, when the detection radiographic source exceeds the radiographic source with the range of movement of the detector
During with the predetermined movement scope of the detector, stop the first time helical scanning fortune of the radiographic source and the detector
It is dynamic, and the data for projection of the detector collection during the first time helical scanning movement is obtained, then control the ray
Source is synchronous with the detector to translate predeterminable range along default translation direction, according to the deflection angle of the scanning turntable, sets
The initial time of the radiographic source and second helical scanning movement of the detector, so as to be swept according to second spiral
Retouch the initial time of motion, control the radiographic source and the detector along the rightabout with the predetermined movement direction around
The object to be scanned carries out second helical scanning movement in a spiral manner, and obtains the second helical scanning fortune
The data for projection of the detector collection during dynamic, by repeating the above steps, until the radiographic source and the detector
Synchronous to move the N-1 predeterminable range along the default translation direction, N is the n times helical scanning according to detection parameter determination
Motion, obtains the data for projection of the detector collection during the n times helical scanning movement, to the n times spiral shell for obtaining
The data for projection of the detector collection enters rearrangement during rotation scanning motion, the data after being reset, to the rearrangement
Data afterwards carry out CT image reconstructions so that radiographic source need to only cover the big of the object to be scanned with the sweep limits of detector
About half area, realizes being scanned large-sized object, so as to reduce by being synchronized with the movement for radiographic source and detector
The cost of detector, improves scan efficiency.
Other features and advantages of the present invention will illustrate in subsequent specification, also, partly become from specification
It is clear that or being understood by implementing the embodiment of the present invention.The purpose of the present invention and other advantages can be by saying for being write
Specifically noted structure is realized and obtained in bright book, claims and accompanying drawing.
Brief description of the drawings
Technical scheme in order to illustrate more clearly the embodiments of the present invention, below will be attached to what is used needed for embodiment
Figure is briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, thus be not construed as it is right
The restriction of scope, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to this
A little accompanying drawings obtain other related accompanying drawings.
Fig. 1 shows a kind of structured flowchart that can be applied to the electronic equipment in the embodiment of the present application；
Fig. 2 is the use schematic diagram of a kind of detector provided in an embodiment of the present invention and radiographic source；
Fig. 3 is a kind of flow chart of CT scan imaging method provided in an embodiment of the present invention；
Fig. 4 is a kind of helical scanning movement track schematic diagram provided in an embodiment of the present invention；
Fig. 5 is a kind of structured flowchart of CT scan imaging system provided in an embodiment of the present invention.
Icon：400- electronic equipments；101- memories；102- storage controls；103- processors；104- Peripheral Interfaces；
105- input-output units；106- audio units；107- display units；100- CT scan imaging systems；110- detectors；
120- radiographic sources；130- objects to be scanned；140- scans turntable；150- master control sets.
Specific embodiment
Below in conjunction with accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Ground description, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Generally exist
The component of the embodiment of the present invention described and illustrated in accompanying drawing can be arranged and designed with a variety of configurations herein.Cause
This, the detailed description of the embodiments of the invention to providing in the accompanying drawings is not intended to limit claimed invention below
Scope, but it is merely representative of selected embodiment of the invention.Based on embodiments of the invention, those skilled in the art are not doing
The every other embodiment obtained on the premise of going out creative work, belongs to the scope of protection of the invention.
It should be noted that：Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined in individual accompanying drawing, then it need not be further defined and explained in subsequent accompanying drawing.Meanwhile, of the invention
In description, term " first ", " second " etc. are only used for distinguishing description, and it is not intended that indicating or implying relative importance.
Fig. 1 is refer to, Fig. 1 shows a kind of structured flowchart of the electronic equipment 400 that can be applied in the embodiment of the present application.
Electronic equipment 400 can include master control set, memory 101, storage control 102, processor 103, Peripheral Interface 104, defeated
Enter output unit 105, audio unit 106, display unit 107.
The memory 101, storage control 102, processor 103, Peripheral Interface 104, input-output unit 105, sound
Frequency unit 106, each element of display unit 107 are directly or indirectly electrically connected with each other, to realize the transmission or friendship of data
Mutually.For example, these elements can be realized being electrically connected with by one or more communication bus or holding wire each other.The master control
During device can be stored in the memory 101 including at least one in the form of software or firmware (firmware) or it is solidificated in institute
State the software function module in the operating system (operating system, OS) of master control set.The processor 103 is used to hold
The executable module stored in line storage 101, such as software function module or computer program that described master control set includes.
Wherein, memory 101 may be, but not limited to, random access memory (Random Access Memory,
RAM), read-only storage (Read Only Memory, ROM), programmable read only memory (Programmable Read-Only
Memory, PROM), erasable read-only memory (Erasable Programmable Read-Only Memory, EPROM),
Electricallyerasable ROM (EEROM) (Electric Erasable Programmable Read-Only Memory, EEPROM) etc..
Wherein, memory 101 is used for storage program, and the processor 103 performs described program after execute instruction is received, foregoing
Method performed by the server of the stream process definition that embodiment of the present invention any embodiment is disclosed can apply to processor 103
In, or realized by processor 103.
Processor 103 is probably a kind of IC chip, the disposal ability with signal.Above-mentioned processor 103 can
Being general processor, including central processing unit (Central Processing Unit, abbreviation CPU), network processing unit
(Network Processor, abbreviation NP) etc.；Can also be digital signal processor (DSP), application specific integrated circuit (ASIC),
It is ready-made programmable gate array (FPGA) or other PLDs, discrete gate or transistor logic, discrete hard
Part component.Can realize or perform disclosed each method in the embodiment of the present invention, step and logic diagram.General processor
Can be microprocessor or the processor 103 can also be any conventional processor etc..
Various input/output devices are coupled to processor 103 and memory 101 by the Peripheral Interface 104.At some
In embodiment, Peripheral Interface 104, processor 103 and storage control 102 can be realized in one single chip.Other one
In a little examples, they can be realized by independent chip respectively.
Input-output unit 105 is used to be supplied to user input data to realize user with the server (or local terminal)
Interaction.The input-output unit 105 may be, but not limited to, mouse and keyboard etc..
Audio unit 106 provides a user with COBBAIF, and it may include one or more microphones, one or more raises
Sound device and voicefrequency circuit.
Display unit 107 provides an interactive interface (such as user's operation circle between the electronic equipment 400 and user
Face) or referred to user for display image data.In the present embodiment, the display unit 107 can be liquid crystal display
Or touch control display.If touch control display, it can be the capacitance type touch control screen or resistance for supporting single-point and multi-point touch operation
Formula touch screen etc..Support that single-point and multi-point touch operation refer to that touch control display can be sensed from one on the touch control display
Or the touch control operation produced simultaneously at multiple positions, and by the touch control operation for sensing transfer to processor 103 calculate and
Treatment.
Various input/output devices are coupled to processor 103 and memory 101 by the Peripheral Interface 104.At some
In embodiment, Peripheral Interface 104, processor 103 and storage control 102 can be realized in one single chip.Other one
In a little examples, they can be realized by independent chip respectively.
Input-output unit 105 is used to be supplied to user input data to realize interacting for user and processing terminal.It is described defeated
Enter output unit 105 may be, but not limited to, mouse and keyboard etc..
Fig. 2 is refer to, Fig. 2 is that a kind of detector 110 provided in an embodiment of the present invention uses signal with radiographic source 120
Figure, the detector 110 includes multiple probe units, and the multiple probe unit sets gradually along preset direction, the ray
Source 120 and the detector 110 are used to detect the scanning object being arranged between the radiographic source 120 and the detector 110
Body 130, scanning turntable 140 is used to place the object to be scanned 130.
First, required to be fixed object to be scanned 130 on the scanning turntable 140 according to detection, to prevent
In scanning process, when rotated, there is change in location in object to be scanned 130 with scanning turntable 140.In addition, in addition it is also necessary to according to detection
It is required that pre-setting visual field size, distance, the detector of radiographic source 120 to scanning turntable 140 center for needing scanning
110 scan the detection parameter such as the distance and imaging size at the center of turntable 140 to described.It should be noted that in the present embodiment
In, the scanning turntable 140 can be truncated cone-shaped, and the object to be scanned 130 can be cylinder, certainly in practical application
In, the shape of scanning turntable 140 and object to be scanned 130 can not required specifically.Further, in the present embodiment, it is described
Detector 110 is arc, so the detector 110 is the curved detector to the distance at scanning turntable 140 center
Distance of the Qi110Hu centers to scanning turntable 140 center.
Furthermore, the to be scanned object 130 larger for some volumes, such as rocket engine etc., at this moment it is accomplished by length
Sufficiently long detector 110 just can be larger to volume object 130 to be scanned be scanned, so largely cause visit
The cost for surveying device 110 increases, and when using small-sized detector 110, the corresponding fan-ray beam of detector 110 can not cover completely
When covering the object 130 to be scanned, the scanning turntable 140 can be deviateed the center line of the fan-ray beam, that is, institute
Stating the corresponding fan-ray beam of detector 110 can not exclusively cover the object to be scanned 130, it is only necessary to cover scanning object
The only about half of area of body 130, so that according to the deflection angle of the scanning turntable 140 for calculating, and no longer need large-scale
Detector 110, in the present embodiment, it is only necessary to which length detector 110 less than normal achieves that the scanning to large-sized object, reaches
To the purpose of increase sweep limits, the detection range of CT is effectively expanded.So, in addition it is also necessary to according to the above-mentioned inspection for pre-setting
Parameter is surveyed to calculate and set vertical range, the radiographic source 120 that the detector 110 deviates scanning turntable 140 center
Deviate the vertical range at scanning turntable 140 center, the detector 110 to synchronize helical scanning with the radiographic source 120 and transport
Dynamic scan pitch, the detector 110 scan turntable 140 during carrying out helical scanning movement twice with the radiographic source 120
Deflection angle and the detector 110 is synchronous with the radiographic source 120 to pre- during this row twice helical scanning movement
If the predeterminable range of translation direction translation.In addition, the detection parameter also includes imaging space resolution ratio.
In addition, in addition it is also necessary to size, imaging size, the sampling time of the detector 110 according to the detector 110,
Movement velocity and the scanning turn that the detector 110 synchronizes helical scanning movement with the radiographic source 120 are set
The rotary speed of platform 140.
Fig. 3 is refer to, Fig. 3 is a kind of flow chart of CT scan imaging method provided in an embodiment of the present invention, described
Method is applied to CT scan imaging system, and methods described specifically includes following steps：
Step S110：The control scanning turntable drives the object to be scanned to be rotated and controls described penetrating
Line source with the detector from default scanning starting position around the object to be scanned in a spiral manner to predetermined movement direction
Carry out first time helical scanning movement.
After setting above-mentioned parameter, by the detector and the radiographic source synchronizing moving to the default scanning start bit
Put, in the present embodiment, the default scanning starting position can be understood as the first end or second of cylindrical object to be scanned
End, then control the scanning turntable to drive the object to be scanned to proceed by rotary motion, and control the radiographic source with
The detector enters to predetermined movement direction in a spiral manner from the default scanning starting position around the object to be scanned
Row first time helical scanning movement, in the present embodiment, it can be understood as the radiographic source is with the detector in a spiral manner
From the first end of cylindrical object to be scanned first time helical scanning is carried out to the direction at the second end of cylindrical object to be scanned
Motion, or for the radiographic source with the detector in a spiral manner from the second end of cylindrical object to be scanned to cylinder
The direction of the first end of object to be scanned carries out first time helical scanning movement.
Step S120：During the first time helical scanning movement, when the detection radiographic source and the detector
Range of movement beyond the predetermined movement scope of the radiographic source and the detector when, stop the radiographic source and the detection
The first time helical scanning movement of device, and obtain the detector collection during the first time helical scanning movement
Data for projection.
During the detector carries out first time helical scanning movement with the radiographic source around object to be scanned, when
Detect the predetermined movement model that the radiographic source exceeds the radiographic source and the detector with the range of movement of the detector
When enclosing, stop the first time helical scanning movement of the radiographic source and the detector, and obtain the first time spiral
The data for projection of the detector collection during scanning motion.In the present embodiment, the radiographic source and the detector
Range of movement can be understood as the side from the first end of cylindrical object to be scanned to the second end of cylindrical object to be scanned
To mobile distance, or from the second end of cylindrical object to be scanned to the first end of cylindrical object to be scanned move away from
From for example, the length of object to be scanned is 1 meter, then the radiographic source can be set with the predetermined movement scope of the detector
It is 1 meter, or more than 1 meter, then, when the range of movement of the radiographic source and the detector is beyond 1 meter, then stop described
The first time helical scanning movement of radiographic source and the detector, and during obtaining the first time helical scanning movement
The data for projection of the detector collection.
Step S130：Control the radiographic source synchronous with the detector and translate predeterminable range, root along default translation direction
According to the deflection angle of the scanning turntable, the starting of the radiographic source and second helical scanning movement of the detector is set
Time.
After the detector and the radiographic source complete first time helical scanning movement, stop the detector with it is described
The helical scanning movement of radiographic source, control the radiographic source synchronous with the detector along the translation of default translation direction preset away from
From if the detector and the first time helical scanning movement of the radiographic source are first from the cylindrical object to be scanned
End motion reaches the cylinder to the second end, the then detector after completing first time helical scanning movement with the radiographic source
Second end of object to be scanned, if the plane with where the detector and the radiographic source is as horizontal plane, then this is default flat
Move direction be just perpendicular to the direction of the horizontal plane, that is, control the radiographic source it is synchronous with the detector edge perpendicular to
The direction translation predeterminable range of the plane where the detector and the radiographic source.The computing formula of the translation predeterminable range is such as
Under：
Wherein, γ is the angle between the two neighboring probe unit and the radiographic source, and R is the curved detector
Radius, N be n times helical scanning movement.
Furthermore, in the case where not stopping scanning the rotary motion of turntable, in order to more accurately obtain object to be scanned
Data for projection so that the CT images for eventually forming can accurately reflect each element of the object to be scanned, can be with
The secondary of helical scanning movement is carried out according to the distance between two neighboring described probe unit, the radiographic source and the detector
The diameter of number and scanning area, obtains the deflection angle of the scanning turntable.The calculating of the deflection angle of the scanning turntable
Formula is as follows：
Wherein, L is the distance between two neighboring described probe unit, and N is n times helical scanning movement, because the spy
It is circle that device is surveyed with the scanning area that the radiographic source is scanned to object to be scanned, so D is the circular scan region
Diameter.
After calculating the deflection angle of the scanning turntable, the radiographic source and the detection are set according to the deflection angle
Second initial time of synchronous scanning campaign of device, it will be understood that, if for example, calculating the deflection of the scanning turntable
Angle is 45 degree, then when the scanning turntable is just rotated to for reference position and deflected 45 degree, the time is set
Second initial time of synchronous scanning campaign of the radiographic source and the detector is set to, then the radiographic source and the spy
Survey device and proceed by second synchronous scanning campaign, wherein, the reference position can be configured according to actual requirement, in this reality
Apply and be not specially limited in example.
Step S140：According to the initial time of second helical scanning movement, the radiographic source and the spy are controlled
Survey device is carried out described second in a spiral manner along the rightabout with the predetermined movement direction around the object to be scanned
Helical scanning movement, and obtain the data for projection of the detector collection during second helical scanning movement.
After setting the radiographic source and the initial time of second helical scanning movement of the detector, control is described
Radiographic source and the detector along the rightabout with the predetermined movement direction around the object to be scanned in a spiral manner
Carry out second helical scanning movement, that is to say, that sweep when the radiographic source and the detector carry out first time spiral
Retouch in motion process, the second end is moved to from the first end of the cylindrical object to be scanned, then to perpendicular to the detection
After the direction translation predeterminable range of the plane where device and the radiographic source, control the radiographic source with the detector along described
The direction of first end of the second end of cylinder object to be scanned to the cylindrical object to be scanned is around the scanning object
Body carries out second helical scanning movement in a spiral manner, and obtains institute during second helical scanning movement
State the data for projection of detector collection.
Step S150：Repeat the above steps, until the radiographic source is synchronous with the detector along the default translation side
To the mobile N-1 predeterminable range, N is the n times helical scanning movement according to detection parameter determination, obtains the n times spiral
The data for projection of the detector collection during scanning motion.
Step S110, step S120, step S130 and step S140 are repeated, until the radiographic source and the detection
Device is synchronous along described default N-1 predeterminable range of translation direction movement, wherein, N is according to detection parameter determination
Detector needs to carry out n times helical scanning movement with the radiographic source, and obtains institute during the n times helical scanning movement
State the data for projection of detector collection.
Fig. 4 is refer to, Fig. 4 is a kind of helical scanning movement track schematic diagram provided in an embodiment of the present invention, such as Fig. 4 institutes
Show, the detector is spiral around the movement locus of the object to be scanned with the radiographic source.In the radiographic source and institute
Detector is stated during first time helical scanning movement is carried out, as a kind of implementation method, can first by the radiographic source with
The detector translates 1.5 times of default translations to perpendicular to the direction of the plane where the detector and the radiographic source first
Distance, then radiographic source turned clockwise around the object to be scanned with detector, while by radiographic source and detector from
The first end of the cylindrical object to be scanned to the second end motion, so as to form first time helical scanning movement；For the first time
After the completion of helical scanning movement, the radiographic source is with the detector to where the detector and the radiographic source
The default translation distance of direction movement of plane, while by radiographic source and detector from the second end of the cylindrical object to be scanned
Moved to first end, so as to complete second helical scanning；N times helical scanning movement can be completed in this way.And in detection
During device and radiographic source are translated, the scanning turntable is not stopped the rotation, thus radiographic source only needed in whole helical scanning movement
At the beginning and end of switch once, centre need not stop beam, improve scan efficiency, save scanning cost.
Step S160：Data for projection to the detector collection during the n times helical scanning movement of acquisition enters
Rearrangement, the data after being reset.
As a kind of implementation method, can be to the method that the data for projection that the detector is gathered enters rearrangement：Will figure
As the projection angular region for rebuilding layer is limited in a small scope, for example, the CT of accelerator to be rebuild the model of the projected angle of layer
It is 12 ° -18 ° to enclose, and the projection angular region of the CT reconstruction layers of X-ray production apparatus is 30 ° -40 °, rather than traditional 180 ° or 360 °,
It is hereby achieved that data for projection of the object to be scanned under different angles.
Step S170：CT image reconstructions are carried out to the data after the rearrangement.
As a kind of implementation method, CT image reconstructions can be carried out to the data after rearrangement using iterative reconstruction algorithm.Can
CT image reconstructions are carried out with the acquisition data for projection for first carrying out each helical scanning movement using TV regularization methods, then will be every
The CT image reconstruction that secondary helical scanning movement is obtained is overlapped, then stack result is corrected, and in the iterative approximation
Prior information is introduced in algorithm implementation process, then the quick reconstruction of CT images is realized using purpose parallel acceleration algorithm, you can obtain institute
State the CT images of object to be scanned.
Fig. 5 is refer to, Fig. 5 is a kind of structured flowchart of CT scan imaging system 100 provided in an embodiment of the present invention,
The system include radiographic source 120, detector 110 and master control set 150, the master control set 150 respectively with the ray
Source 120 and the detector 110 are coupled.
The master control set 150, for controlling the scanning turntable 140 to drive the object to be scanned 130 to be rotated
Move and control the radiographic source 120 with the detector 110 from the default scanning starting position around described to be scanned
Object 130 carries out first time helical scanning movement to predetermined movement direction in a spiral manner.
The master control set 150, is additionally operable to during the first time helical scanning movement, when the detection radiographic source
120 with the range of movement of the detector 110 beyond predetermined movement scope of the radiographic source 120 with the detector 110 when,
Stop the first time helical scanning movement of the radiographic source 120 and the detector 110, and obtain the first time spiral
The data for projection of the collection of the detector 110 during scanning motion.
The master control set 150, is additionally operable to control the radiographic source 120 synchronous with the detector 110 along default translation
Direction translates predeterminable range, according to the deflection angle of the scanning turntable 140, sets the radiographic source 120 and the detector
The initial time of 110 second helical scanning movement.
The master control set 150, is additionally operable to the initial time according to second helical scanning movement, is penetrated described in control
Line source 120 with the detector 110 along the rightabout with the predetermined movement direction around the object to be scanned 130 with spiral shell
Rotation mode carries out second helical scanning movement, and obtains the detector during second helical scanning movement
The data for projection of 110 collections.
The master control set 150, is additionally operable to control the radiographic source 120 synchronous with the detector 110 along described default
N-1 predeterminable range of translation direction movement, N is the n times helical scanning movement according to detection parameter determination, obtains the N
The data for projection of the collection of the detector 110 during secondary helical scanning movement.
The master control set 150, is additionally operable to the detector 110 during the n times helical scanning movement to acquisition
The data for projection of collection enters rearrangement, the data after being reset.
The master control set 150, is additionally operable to carry out CT image reconstructions to the data after the rearrangement.
Used as a kind of implementation method, the master control set 150 includes：Translation module, angle acquisition module, setup module and
Rebuild module.
Translation module, it is pre- along the translation of default translation direction for controlling the radiographic source 120 synchronous with the detector 110
If distance.
Angle acquisition module, for according to the distance between two neighboring described probe unit, the radiographic source 120 and institute
Stating detector 110 carries out the number of times of helical scanning movement and the diameter of scanning area, obtains the deflection of the scanning turntable 140
Angle.
Setup module, for the deflection angle according to the scanning turntable 140, sets the radiographic source 120 and the spy
Survey second initial time of synchronous scanning campaign of device 110.
Module is rebuild, for carrying out CT image reconstructions using iterative reconstruction algorithm to the data after the rearrangement.
In addition, the computing formula of the deflection angle of the scanning turntable 140 is：
Wherein, L is the distance between two neighboring described probe unit, and N is n times helical scanning movement, and D is the scanning
The diameter in region.
The computing formula of the predeterminable range is：
Wherein, γ is the angle between the two neighboring probe unit and the radiographic source 120, and R is the detector
110 radius, N is n times helical scanning movement.
It is apparent to those skilled in the art that, for convenience and simplicity of description, the system of foregoing description
Specific work process, may be referred to the corresponding process in preceding method, no longer excessively repeat herein.
In sum, the embodiment of the present invention provides a kind of CT scan imaging method and system, is swept by described in control
Turntable is retouched to drive the object to be scanned to be rotated and control the radiographic source to be preset from described with the detector
Scanning starting position carries out first time helical scanning movement to predetermined movement direction in a spiral manner around the object to be scanned,
So as to during the first time helical scanning movement, when the detection radiographic source exceeds with the range of movement of the detector
During the predetermined movement scope of the radiographic source and the detector, stop the first time of the radiographic source and the detector
Helical scanning movement, and the data for projection of the detector collection during the first time helical scanning movement is obtained, then control
The radiographic source is made synchronous with the detector along default translation direction translation predeterminable range, according to the deflection of the scanning turntable
Angle, sets the initial time of the radiographic source and second helical scanning movement of the detector, so as to according to described the
The initial time of secondary spiral scanning motion, controls the radiographic source with the detector along the phase with the predetermined movement direction
Opposite direction carries out second helical scanning movement in a spiral manner around the object to be scanned, and obtains described second
The data for projection of detector collection during helical scanning movement, by repeating the above steps, until the radiographic source with
The detector is synchronous along described default N-1 predeterminable range of translation direction movement, and N is the N according to detection parameter determination
Secondary helical scanning movement, obtains the data for projection of the detector collection during the n times helical scanning movement, to what is obtained
The data for projection of the detector collection enters rearrangement during the n times helical scanning movement, and the data after being reset are right
Data after the rearrangement carry out CT image reconstructions so that radiographic source need to only cover described to be scanned with the sweep limits of detector
The only about half of area of object can realize being scanned large-sized object by being synchronized with the movement for radiographic source and detector, from
And the cost of detector is reduced, improve scan efficiency.
In several embodiments provided herein, it should be understood that disclosed apparatus and method, it is also possible to pass through
Other modes are realized.Device embodiment described above is only schematical, for example, flow chart and block diagram in accompanying drawing
Show the device of multiple embodiments of the invention, the architectural framework in the cards of method and computer program product,
Function and operation.At this point, each square frame in flow chart or block diagram can represent one the one of module, program segment or code
Part a, part for the module, program segment or code is used to realize holding for the logic function for specifying comprising one or more
Row instruction.It should also be noted that at some as in the implementation replaced, the function of being marked in square frame can also be being different from
The order marked in accompanying drawing occurs.For example, two continuous square frames can essentially be performed substantially in parallel, they are sometimes
Can perform in the opposite order, this is depending on involved function.It is also noted that every in block diagram and/or flow chart
The combination of the square frame in individual square frame and block diagram and/or flow chart, can use the function or the special base of action for performing regulation
Realized in the system of hardware, or can be realized with the combination of computer instruction with specialized hardware.
In addition, each functional module in each embodiment of the invention can integrate to form an independent portion
Divide, or modules individualism, it is also possible to which two or more modules are integrated to form an independent part.
If the function is to realize in the form of software function module and as independent production marketing or when using, can be with
Storage is in a computer read/write memory medium.Based on such understanding, technical scheme is substantially in other words
The part contributed to prior art or the part of the technical scheme can be embodied in the form of software product, the meter
Calculation machine software product is stored in a storage medium, including some instructions are used to so that a computer equipment (can be individual
People's computer, server, or network equipment etc.) perform all or part of step of each embodiment methods described of the invention.
And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage (ROM, Read-Only Memory), arbitrary access are deposited
Reservoir (RAM, Random Access Memory), magnetic disc or CD etc. are various can be with the medium of store program codes.Need
Illustrate, herein, such as first and second or the like relational terms be used merely to by an entity or operation with
Another entity or operation make a distinction, and not necessarily require or imply these entities or there is any this reality between operating
The relation or order on border.And, term " including ", "comprising" or its any other variant be intended to the bag of nonexcludability
Contain, so that process, method, article or equipment including a series of key elements are not only including those key elements, but also including
Other key elements being not expressly set out, or it is this process, method, article or the intrinsic key element of equipment also to include.
In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that including the key element
Process, method, article or equipment in also there is other identical element.
The preferred embodiments of the present invention are the foregoing is only, is not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.It should be noted that：Similar label and letter exists
Similar terms is represented in following accompanying drawing, therefore, once being defined in a certain Xiang Yi accompanying drawing, then it is not required in subsequent accompanying drawing
It is further defined and is explained.
The above, specific embodiment only of the invention, but protection scope of the present invention is not limited thereto, and it is any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all contain
Cover within protection scope of the present invention.Therefore, protection scope of the present invention described should be defined by scope of the claims.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or deposited between operating
In any this actual relation or order.And, term " including ", "comprising" or its any other variant be intended to
Nonexcludability is included, so that process, method, article or equipment including a series of key elements not only will including those
Element, but also other key elements including being not expressly set out, or also include being this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Also there is other identical element in process, method, article or equipment including the key element.
Claims (10)
1. a kind of CT scan imaging method, it is characterised in that be applied to CT scan imaging system, the system includes
Radiographic source and detector, the detector include multiple probe units, and the multiple probe unit sets gradually along preset direction,
The radiographic source and the detector are used to detect the object to be scanned being arranged between the radiographic source and the detector, sweep
Turntable is retouched for placing the object to be scanned, methods described includes：
The control scanning turntable drives the object to be scanned to be rotated and control the radiographic source with the spy
Survey device carries out first time spiral shell to predetermined movement direction in a spiral manner from default scanning starting position around the object to be scanned
Rotation scanning motion；
During the first time helical scanning movement, when the detection radiographic source exceeds with the range of movement of the detector
During the predetermined movement scope of the radiographic source and the detector, stop the first time of the radiographic source and the detector
Helical scanning movement, and obtain the data for projection of the detector collection during the first time helical scanning movement；
Control the radiographic source synchronous with the detector and translate predeterminable range along default translation direction, according to the scanning turntable
Deflection angle, the initial time of the radiographic source and second helical scanning movement of the detector is set；
According to the initial time of second helical scanning movement, control the radiographic source with the detector along pre- with described
If the rightabout of the direction of motion carries out second helical scanning movement in a spiral manner around the object to be scanned, and
Obtain the data for projection of the detector collection during second helical scanning movement；
Repeat the above steps, N-1 institute is moved along the default translation direction until the radiographic source is synchronous with the detector
Predeterminable range is stated, N is the n times helical scanning movement according to detection parameter determination, during the acquisition n times helical scanning movement
The data for projection of the detector collection；
Data for projection to the detector collection during the n times helical scanning movement of acquisition enters rearrangement, is weighed
Data after row；
CT image reconstructions are carried out to the data after the rearrangement.
2. method according to claim 1, it is characterised in that the control radiographic source is synchronous with the detector along presetting
Translation direction translates predeterminable range, according to the deflection angle of the scanning turntable, sets the radiographic source and the detector
Second initial time of helical scanning movement, including：
Control the radiographic source synchronous with the detector and translate predeterminable range along default translation direction；
Helical scanning movement is carried out according to the distance between two neighboring described probe unit, the radiographic source and the detector
Number of times and scanning area diameter, obtain it is described scanning turntable deflection angle；
According to the deflection angle of the scanning turntable, second synchronous scanning campaign of the radiographic source and the detector is set
Initial time.
3. method according to claim 2, it is characterised in that the computing formula of the deflection angle of the scanning turntable is：
Wherein, L is the distance between two neighboring described probe unit, and N is n times helical scanning movement, and D is the scanning area
Diameter.
4. method according to claim 1, it is characterised in that the predeterminable range is based on：
Obtain,
Wherein, γ is the angle between the two neighboring probe unit and the radiographic source, and R is the radius of the detector, N
It is n times helical scanning movement.
5. method according to claim 1, it is characterised in that the data after the rearrangement are carried out with CT image reconstructions, wraps
Include：
CT image reconstructions are carried out using iterative reconstruction algorithm to the data after the rearrangement.
6. a kind of CT scan imaging system, it is characterised in that the system includes radiographic source, detector and master control dress
Put, the master control set is coupled with the radiographic source and the detector respectively；
The master control set, for controlling the scanning turntable to drive the object to be scanned to be rotated and control institute
State radiographic source and the detector from the default scanning starting position around the object to be scanned in a spiral manner to default
The direction of motion carries out first time helical scanning movement；
The master control set, is additionally operable to during the first time helical scanning movement, when detect the radiographic source with it is described
When the range of movement of detector is beyond predetermined movement scope of the radiographic source with the detector, stop the radiographic source and institute
The first time helical scanning movement of detector is stated, and obtains the detector during the first time helical scanning movement
The data for projection of collection；
The master control set, be additionally operable to control the radiographic source synchronous with the detector along the translation of default translation direction it is default away from
From, according to the deflection angle of the scanning turntable, second helical scanning movement of the setting radiographic source and the detector
Initial time；
The master control set, is additionally operable to the initial time according to second helical scanning movement, control the radiographic source with
The detector carries out described in a spiral manner along the rightabout with the predetermined movement direction around the object to be scanned
Second helical scanning movement, and obtain the projection number of the detector collection during second helical scanning movement
According to；
The master control set, is additionally operable to control the radiographic source synchronous with the detector along the default translation direction movement N-
1 predeterminable range, N is the n times helical scanning movement according to detection parameter determination, obtains the n times helical scanning movement
During detector collection data for projection；
The master control set, is additionally operable to the projection of the detector collection during the n times helical scanning movement to acquisition
Data enter rearrangement, the data after being reset；
The master control set, is additionally operable to carry out CT image reconstructions to the data after the rearrangement.
7. system according to claim 6, it is characterised in that the master control set includes：
Translation module, predeterminable range is translated for controlling the radiographic source synchronous with the detector along default translation direction；
Angle acquisition module, for according to the distance between two neighboring described probe unit, the radiographic source and the detection
Device carries out the number of times of helical scanning movement and the diameter of scanning area, obtains the deflection angle of the scanning turntable；
Setup module, for the deflection angle according to the scanning turntable, sets the radiographic source and the second of the detector
The initial time of subsynchronous scanning motion.
8. system according to claim 7, it is characterised in that the computing formula of the deflection angle of the scanning turntable is：
Wherein, L is the distance between two neighboring described probe unit, and N is n times helical scanning movement, and D is the scanning area
Diameter.
9. system according to claim 6, it is characterised in that the predeterminable range is based on：
Obtain,
Wherein, γ is the angle between the two neighboring probe unit and the radiographic source, and R is the radius of the detector, N
It is n times helical scanning movement.
10. system according to claim 6, it is characterised in that the master control set also includes:
Module is rebuild, for carrying out CT image reconstructions using iterative reconstruction algorithm to the data after the rearrangement.
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