CN110335671A - A kind of modulated CT detector data compression acquisition mode - Google Patents
A kind of modulated CT detector data compression acquisition mode Download PDFInfo
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- A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
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Abstract
The present invention provides a kind of modulated CT detector datas to compress acquisition mode, is related to Medical Imaging Technology field, including carry out the scanning of patient's locating plate；Divide multiple scanning areas according to rack rotation dynamic: plurality of scanning area includes region one, region two and region three；The tangent line in focus and heart scanning region intersects at the regional scope that detector is formed as region two, and the tangent line in focus and heart scanning region intersects at detector and focus and the tangent line on scan vision boundary intersects at the regional scope that detector is formed as region one and region three；As rack rotates, trizonal size dynamic change；The data in dynamic compression region one and region three, compression process are completed in the data acquisition board of the rotor portion of CT machine.Data compression acquisition mode of the present invention can reduce data bandwidth, and data amount reduces the requirement of slip ring data transfer bandwidth.
Description
Technical field
The present invention relates to technical field of medical equipment, more particularly to a kind of modulated CT detector data to compress acquisition side
Formula.
Background technique
The chief component of third generation CT system includes Tube (bulb), Collimator (beam-defining clipper), Detector
(detector).X-ray bulb issues X-ray, and the light beam to form a taper is limited by beam-defining clipper.Cone-shaped beam is irradiated to detection
Electric signal is converted by detector on device and is converted to digital information by data acquisition and converting unit and is stored at image
In reason system.Image processing system generates image by a series of correcting algorithm and image reconstruction algorithm and is shown in display
On.For cost and technology maturation degree, mainstream detector, which is all used, is arranged in an arc by many detector modules
Entire detector is formed on the face of shape or polygon.A regularly arranged detector cells are formed in each detector module
Matrix.
In order to scan heart, CT gantry rotor must be rotated with very high speed accomplishes " freezing " heart movement with this
Purpose.CT revolving speed most fast at present has had reached the every circle of 0.23s and 0.25s.Meanwhile the width of detector has also reached covering
16cm sweep length totally 256 rows or 320 row's detectors.The pixel number of the every row of detector generally 900 or so, each pixel
Data are generally 16 or 24 bit binary datas, therefore data transfer bandwidth is very big.
In the prior art, using expensive slip ring, perhaps using the modulation of the focal position of X-direction or Z-direction or use
The energy of focal position modulation technique and height the kV switching of the spectral imaging mode of height kV switching, X-direction or Z-direction
Spectrum imaging mode more exacerbates the demand to high-transmission bandwidth.In order to adapt to fly focus scanning mode or height kV scanning mould
The sample rate of formula, a circle will usually reach 4096 or so.Therefore in the case where flying focus mode, transmission bandwidth required for slip ring is at least
For 320*900*24*4096/0.23/ (1024*1024*1024)=114.6Gbps.This is that current slip ring design can not reach
It arrives.Even if being encoded using 16bit, 256 row's detectors, 2048 sample rates of every circle, it is also desirable to the slip ring bandwidth of 28.1Gbps.Have
A little producers are designed using double bulb double detectors, and a detector covers larger scan vision, the covering of another detector compared with
Small scan vision, such data volume can further increase.Therefore, it is limited by slip ring bandwidth, quickly scanning and the switching of winged focus
And kV switching is difficult to accomplish in heart scanning simultaneously.Generalling use multi-channel coupling in the prior art is a channel to drop
Low data bandwidth, but its region division is fixed, and such much channel communication will cause the resolution ratio reduction of entire scanning area.It is existing
Have in technology also to have using angle direction sample rate is promoted and reduces partial center region because aliasing caused by sampled distance is big is pseudo-
Shadow, such technology can further bring the occupancy of more big data bandwidth.
Based on this, thus this case generates.
Summary of the invention
In order to solve drawbacks described above existing in the prior art, the present invention provides a kind of modulated CT detector datas
Compress acquisition mode, it is possible to reduce data bandwidth, data amount.
To achieve the goals above, the technical solution adopted by the present invention is as follows:
A kind of modulated CT detector data compression acquisition mode, include the following:
(1) scanning of patient's locating plate is carried out；
(2) divide multiple scanning areas according to rack rotation dynamic: plurality of scanning area includes region one, region two and area
Domain three；The regional scope that the tangent line in focus and heart scanning region intersects at detector formation is region two, and focus and heart are swept
The tangent line for retouching region intersects at detector and focus and the tangent line on scan vision boundary intersects at the region model that detector is formed
It encloses for region one and region three；As rack rotates, trizonal size dynamic change；
(3) data in dynamic compression region one and region three, compression process is in the data acquisition board of the rotor portion of CT machine
It completes.
Further, in the step (2), plurality of scanning area further includes the scan vision of a definition, definition
For scan vision centered on rack rotation center, definition scan vision radius is R；Focus intersects with the tangent line for defining scan vision
In detector formed regional scope be region four；Region four includes whole regions two, region one and/or area comprising part
Domain three.
Further, in dynamic compression region four in addition to region two remaining area data.
Further, dynamic compression data pressure in such a way that multiple detector pixel units synthesize a unit
Contracting data.
Further, the level of data compression of remaining area is less than region one and region three in addition to region two in region four
In in addition to region four remaining area level of data compression.
The working principle of the invention: since in heart scanning imaging process, the volume of the entire plane of scanning motion shared by heart is very
It is small, and the image quality requirements except heart are not high.In different gantry rotation angles, need to cover the detection of heart
Device channel position and number are each different.Method proposed by the present invention is, in different gantry rotation angles, for covering the heart
The detector pixel data in dirty district domain do not use compression, and the pixel data of the exterior domain of heart is compressed.
The present invention is able to achieve following technical effect:
(1) present invention provides a kind of mode of dynamic compression detector data, i.e., according to scanning area-of-interest dynamically spy
The method that device is divided into multiple regions is surveyed, each region uses the compress mode of different ratios to reduce data volume, to make height
The scanning mode of sample rate is possibly realized.And compression process of the invention is complete in the data acquisition board of the rotor portion of CT machine
At, thus the requirement of slip ring data transfer bandwidth can be greatly reduced.
(2) present invention reduces slip ring bandwidth by dynamically changing detector data compress mode in heart scanning
It occupies, make partial center scanning can in high sampling rate mode (focus mode like flying, quick kV switching, the scanning of high revolving speed) while
With the very big slip ring bandwidth requirement for reducing heart scanning and winged focus and height kV handoff technique while using, make heart scanning
It is able to use winged focus and height kV handoff technique.
Detailed description of the invention
Fig. 1 is the relative position schematic diagram of cardiac position of the present invention and rack rotation center；
Fig. 2-1 is 1 region division schematic diagram one of embodiment (under a certain rotation angle of rack)；
Fig. 2-2 is 1 region division schematic diagram two of embodiment (under another rotation angle of rack)；
Fig. 3-1 is 2 region division schematic diagram one of embodiment (under a certain rotation angle of rack)；
Fig. 3-2 is 2 region division schematic diagram two of embodiment (under another rotation angle of rack).
Specific embodiment
In order to make the attainable technical effect of technological means of the invention and its institute, more perfect disclosure can be become apparent from,
It 2 embodiments is hereby provided, and is described in detail as follows in conjunction with attached drawing, and state to be described below, region one is region 1, area
Domain two is region 2, region three i.e. region 3.
Embodiment 1
The CT detector data that one kind of the present embodiment is modulated compresses acquisition mode, include the following:
(1) scanning of patient's locating plate is carried out；Prone position and positioning picture of the patient on scanning bed are collected for subsequent calculating.
CT system estimates heart region in scanning bed prone position according to locating plate and patient.
(2) divide multiple scanning areas according to rack rotation dynamic: plurality of scanning area includes region one, region two
With region three；The regional scope that the tangent line in focus and heart scanning region intersects at detector formation is region two, focus and the heart
The tangent line of dirty scanning area intersects at detector and focus and the tangent line on scan vision boundary intersects at the area that detector is formed
Domain range is region one and region three；As rack rotates, trizonal size dynamic change；
(3) data in dynamic compression region one and region three, compression process is in the data acquisition board of the rotor portion of CT machine
It completes.Dynamic compression data compressed data in such a way that multiple detector pixel units synthesize a unit.
In embodiment 1, as shown in Fig. 2-1 and Fig. 2-2, when rack rotates to different angle, focus and heart scanning area
The tangent line and detector in domain intersect at two o'clock B and C.Region 1 is made of detector circular arc FAB, and region 2 is by detector circular arc FBC
Composition, region 3 is made of detector circular arc FCD.As rack rotates to different angles, trizonal size dynamically changes
Become.Since region 2 is the region scanning heart and paying close attention to, and region 1 and region 3 are not focus, so the present embodiment
It proposes to use different compression ratios in three regions.Region 2 changes raw scanning data without any compression, in 1 He of region
Region 3 is in such a way that multiple detector pixel units synthesize a unit come compressed data.For example, by using two detectors
Pixel unit synthesizes a data output, thus the data transfer rate in region 1 and region 3 can be reduced half.It can also adopt
The data transfer rate in region 1 and region 3 can be reduced with the mode that three detector pixel units synthesize the output of a data
For the one third of uncompressed mode.
The realization of above-mentioned division mode is gantry rotation angle and gantry rotation times according to initial exposure by station
Computer calculates the division mode that detector data is compressed in different gantry rotation angles.
The compression ratio and compression method number of detector division mode and different zones that station computer calculates upper step
According in the data acquisition control plate for being sent to rotor portion.
Data acquisition control plate initialization detector and system set-up information start exposure and according to the regions of calculated in advance
Division mode dynamically carries out data compression and is transferred to reconstruction computer by slip ring system in real time.
It rebuilds computer the detector data through overcompression received is rebuild to obtain scan image.
Embodiment 2
The CT detector data that one kind of the present embodiment is modulated compresses acquisition mode, include the following:
(1) scanning of patient's locating plate is carried out；Prone position and positioning picture of the patient on scanning bed are collected for subsequent calculating.
CT system estimates heart region in scanning bed prone position according to locating plate and patient.
(2) divide multiple scanning areas according to rack rotation dynamic: plurality of scanning area includes region one, region two
With region three；The regional scope that the tangent line in focus and heart scanning region intersects at detector formation is region two, focus and the heart
The tangent line of dirty scanning area intersects at detector and focus and the tangent line on scan vision boundary intersects at the area that detector is formed
Domain range is region one and region three；As rack rotates, trizonal size dynamic change；Plurality of scanning area is also
The scan vision defined including one defines scan vision centered on rack rotation center, and definition scan vision radius is R；
The regional scope that focus and the tangent line for defining scan vision intersect at detector formation is region four；Region four includes whole area
Domain two, region one and/or region three comprising part.
(3) data in dynamic compression region one and region three, compression process are acquired in the data of the rotor portion of CT machine
It is completed on plate.Dynamic compression data compressed data in such a way that multiple detector pixel units synthesize a unit.Dynamically
In constricted zone four in addition to region two remaining area data.In region four in addition to region two remaining area data compression
Degree is less than the level of data compression of the remaining area in addition to region four in region one and region three.
In embodiment 2, a scanning view is defined on the basis of the first implementation (division mode in embodiment 1)
Wild (scan vision radius is R).Higher compression is used outside this visual field using lower compression ratio in this scan vision
Than dividing number of regions and size according to the different angle of bulb dynamic.As shown in Fig. 3-1 and Fig. 3-2, two racks not
4 regions and 5 regions can be respectively divided into when with rotation angle.The area of region FAE, FCD and Fig. 3-2 in Fig. 3-1
Domain FAE and FGD can synthesize a data output using 3 detector pixels.The area in the FEB and Fig. 3-2 of region in Fig. 3-1
Domain FEB and FCG can synthesize a data output using 2 detector pixels.Without detector data in the FBC of region
Compression.
The realization of above-mentioned division mode is gantry rotation angle and gantry rotation times according to initial exposure by station
Computer calculates the division mode that detector data is compressed in different gantry rotation angles.
The compression ratio and compression method number of detector division mode and different zones that station computer calculates upper step
According in the data acquisition control plate for being sent to rotor portion.
Data acquisition control plate initialization detector and system set-up information start exposure and according to the regions of calculated in advance
Division mode dynamically carries out data compression and is transferred to reconstruction computer by slip ring system in real time.
It rebuilds computer the detector data through overcompression received is rebuild to obtain scan image.
Dynamic data compression of the present invention can be programmed in the data collection system of rotor portion using FPGA or using embedding
Enter the programming mode of formula to realize.The data that the different sampling angle of each bulb samples out contain the data that dynamic compression is crossed
And one head information for record area division information and compression ratio and compress mode.Certainly, involved in the present invention to arrive
Dynamic data compress mode merges into the side in a channel in addition to the multichannel in above-mentioned two example can be used directly to be added
Formula, can also be using common other well-known data compression scheme such as Run- Length Codings.
The above content is combine the preferred embodiment of the present invention to made by provided technical solution further specifically
It is bright, and it cannot be said that the present invention specific implementation be confined to it is above-mentioned these explanation, for the common skill of the technical field of the invention
For art personnel, without departing from the inventive concept of the premise, a number of simple deductions or replacements can also be made, all should be considered as
It belongs to the scope of protection of the present invention.
Claims (6)
1. a kind of modulated CT detector data compresses acquisition mode, which is characterized in that include the following:
(1) scanning of patient's locating plate is carried out；
(2) divide multiple scanning areas according to rack rotation dynamic: plurality of scanning area includes region one, region two and area
Domain three；The regional scope that the tangent line in focus and heart scanning region intersects at detector formation is region two, and focus and heart are swept
The tangent line for retouching region intersects at detector and focus and the tangent line on scan vision boundary intersects at the region model that detector is formed
It encloses for region one and region three；As rack rotates, trizonal size dynamic change；
(3) data in dynamic compression region one and region three, compression process is in the data acquisition board of the rotor portion of CT machine
It completes.
2. a kind of modulated CT detector data as described in claim 1 compresses acquisition mode, it is characterised in that: the step
Suddenly in (2), plurality of scanning area further includes the scan vision of a definition, defines scan vision with rack rotation center and is
Center, definition scan vision radius are R；Focus intersects at the regional scope that detector is formed with the tangent line for defining scan vision
Region four；Region four includes whole regions two, region one and/or region three comprising part.
3. a kind of modulated CT detector data as claimed in claim 2 compresses acquisition mode, it is characterised in that: dynamic is pressed
In contracting region four in addition to region two remaining area data.
4. the modulated CT detector data of one kind as claimed in claim 1 or 3 compresses acquisition mode, it is characterised in that: institute
State dynamic compression data compressed data in such a way that multiple detector pixel units synthesize a unit.
5. a kind of modulated CT detector data as claimed in claim 4 compresses acquisition mode, it is characterised in that: region four
In in addition to region two level of data compression of remaining area be less than in region one and region three remaining area in addition to region four
Level of data compression.
6. a kind of modulated CT detector data as described in claim 1 or 3 or 4 compresses acquisition mode, feature exists
In: dynamic compression data programmed by the data collection system in rotor portion using FPGA or embedded programming mode come
It realizes.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111084635A (en) * | 2020-01-02 | 2020-05-01 | 沈阳先进医疗设备技术孵化中心有限公司 | CT scanning method and device, CT equipment and CT system |
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