CN109961394A - A kind of MRI/PET/CT/PET-CT panoramic video auxiliary system - Google Patents
A kind of MRI/PET/CT/PET-CT panoramic video auxiliary system Download PDFInfo
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Abstract
A kind of MRI/PET/CT/PET-CT panoramic video auxiliary system, when being applied to carry out the Scanning Detctions such as MRI, PET, CT, PET-CT, scanning bed upper human body position and posture in the scanning machine frame aperture of acquisition monitoring in real time.Video pre-filtering module, the video-splicing module of each road video overlay region progress anastomosing and splicing, the video storage modules of storage splicing rear video and the video display module of display splicing rear video that system includes the audio video synchronization acquisition module of multichannel wide angle cameras and its pose regulating device composition, carries out video distortion correction processing.System uses GPU parallel computation Multi-thread control, carries out video acquisition, pretreatment, splicing, display and storage using translation+variable diameter rotary composite movement model.The system can satisfy the direct complete observation of position chanP when doctor is scanned patient.
Description
Technical field
The present invention relates to MRI/PET/CT/PET-CT ancillary technique field more particularly to a kind of MRI/PET/CT/PET-CT
Panoramic video auxiliary system.
Background technique
CT(Computed Tomography), CT scan.It is disconnected to testee using computer technology
Layer scan image carries out rebuilding the scanning mode for obtaining three-dimensional tomographic image.
PET (positron emission tomography), Positron Emission Computed Tomography.Utilize positive electricity
The human metabolites such as daughter nuclide labelled glucose reflect that its metabolism becomes to the intake of imaging agent as imaging agent, by lesion
Change, to provide the biological metabolism information of disease for clinic.
PET-CT combines PET and CT, shares an image workstation using the same examination couch,
PET/CT has the function of PET, CT and simultaneously by PET image and CT image co-registration etc..
MRI(Magnetic Resonance Imaging), magnetic resonance imaging.The characteristics of using nuclear spin campaign,
In externally-applied magnetic field, signal is generated after RF pulse-to-pulse impulse, computer is detected and inputted with detector, is turned by computer disposal
Image is shown after changing on the screen.
MRI, PET, CT and PET-CT are used equally for clinical medicine to detect, and facilitate doctor and are more precisely diagnosed to be trouble
The specific illness of person occupies an important position in clinical medicine detection.Among these, the sweep time of CT is about 3-5s, PET-
The sweep time of CT is about 15-30min, and the sweep time of MRI is about 10-20min and most MRI machines check space
More close.When carrying out these detections, patient is required to keep specific position motionless within sweep time, otherwise will lead
The appearance for causing artifact influences testing result and then influences to diagnose.And patient with it is scanning bed enter in scanning machine frame aperture into
When row scanning, doctor is difficult to observe the scanning mode of patient, for example, patient initial position be adjusted so as to it is whether suitable, patient
Whether position changes, patient is because being in alone mood swing generated compared with enclosure space etc..
Summary of the invention
It is wide by multichannel the purpose of the present invention is to provide a kind of MRI/PET/CT/PET-CT panoramic video auxiliary system
Angle high-definition camera in MRI/PET/CT/PET-CT scanning machine frame aperture carry out video acquire, splice, store and show in real time,
Meet the direct complete observation of position chanP when doctor is scanned patient.
The technical issues that need to address are as follows:
1, the problem of panoramic video real-time display.Since patient is when being scanned detection, doctor needs to observe patient's at any time
Position chanP, therefore, the panoramic video that patient body position changes when being scanned need real-time display.
2, video image aberration problems caused by short distance video acquisition.MRI, PET, CT and PET-CT scanner scanning
Rack aperture is generally between 60cm-90cm.When scanning, the thickness that scanning bed and patient receives the physical feeling of scanning is removed,
Scanning machine frame aperture inner top to human body distance about between 300mm-600mm.If patient size's obesity or body
Place has the lesions such as tumour, and the distance of scanning gantry aperture inner top to human body can be closer.And the multichannel video camera in the system
It is installed in scanning machine frame aperture inner top, the range that so close video acquisition distance will lead to single camera acquisition becomes smaller.
If using standard lens, single camera acquisition range is small to cause video camera total number more, and then increase subsequent view
The workload and difficulty of frequency splicing；If using wide-angle lens or bugeye lens, single camera acquisition range becomes
Big video camera total number is reduced, but the relatively remote obvious several times of distortion that video image generates, and how preferably to eliminate distortion
The quality of subsequent video splicing will be directly influenced.
3, what the multichannel and pose of video camera caused by short distance video acquisition and scanning gantry internal structure are complicated adjusted
Problem.Due to short distance video acquisition, single camera acquisition range is caused to be difficult to cover entire pickup area, it is therefore desirable to
Multichannel video camera synchronous acquisition video-splicing is at panoramic video.To prevent video camera from influencing scanning result, the installation of multichannel video camera
Multichannel video camera is caused to exist without reality since scanning gantry internal structure is complicated in the inside of scanning machine frame aperture inner top
Unified datum clamp face, reference line, the pose for how adjusting multichannel video camera will directly affect subsequent video processing work
Workload size and runing time length.
4, video collection area is long and scanning gantry short-range missile causes the problem of camera motion model complexity.Due to video acquisition area
Domain further includes a part at the outer both ends of scanning machine frame aperture, in some instances it may even be possible to including scanning lathe in addition to the region in scanning machine frame aperture
The all areas that motion profile includes, but video camera is mounted on scanning machine frame aperture inner top, the length of scanning gantry is less than view
Frequency pickup area length, while the video of each video camera acquisition also needs the overlapping of certain area, although this is resulted in using wide
Angle video camera acquires video, and all video cameras in the case where collection surface, can not still collect set in central axis
All video collection areas；In response to this, the video camera deflection certain angle at scanning machine frame aperture both ends can only be will be close to
It meets the requirements；It is this can regard as same video camera while translational motion again axis rotation certain angle, be translation+
The compound motion of variable diameter rotation.
The technical solution of the present invention is as follows:
A kind of MRI/PET/CT/PET-CT panoramic video auxiliary system, is applied to, and sweeps carrying out MRI, PET, CT, PET-CT etc.
When retouching detection, scanning bed upper human body position and posture in the scanning machine frame aperture of acquisition monitoring in real time.
System include: audio video synchronization acquisition module, video pre-filtering module, video-splicing module, video storage modules and
Video display module, wherein video acquisition module is made of multichannel wide angle cameras and its pose regulating device, is adopted for synchronizing
The video data of the road Ji Ge video camera；Video pre-filtering module is used to carry out distortion correction processing to video；Video-splicing module
For carrying out anastomosing and splicing to each road video overlay region；Video storage modules are for storing the video spliced；Video is shown
The module video good for display splicing.
System carries out GPU parallel computation, using Multi-thread control, specific steps are as follows:
Step 1: distributing a thread respectively for every road video of synchronous acquisition, add label in each thread for the video of acquisition
(including the information such as camera number and acquisition time in label) is simultaneously successively ranked up according to acquisition time in label, according still further to
Sequence successively successively carries out distortion correction processing；
Step 2: in pairs according to video camera neighbouring relations, then being every group of view by distortion correction treated each road video frame
Frequency frame respectively distributes a thread again, according to being ordered as the video frame of same time to being registrated and merged in thread, if
Image cutting is then divided into two, retains registration features point by the video frame images for having center camera to number in video frame pair
The half range video frame images of aggregation are merged again；
Step 3: by fused each group video to centralized distribution to total thread, by same acquisition time, identical in total thread
The frame image of segmentation of label camera number is combined into one as panoramic video frame image, according still further to sequence successively output display
And save panoramic video.
System multi-channel wide angle cameras is respectively provided with a set of pose regulating device, the adjustable each road video camera of the device
The displacement of vertical direction, the displacement of horizontal direction rotate angle and respective video camera by the axis of axis of respective camera center line
The angle of center line and vertical direction, the device may insure that the video data of multichannel video camera acquisition is sustained height, same
Video data on axis and same plane.
The video pre-filtering module carries out distortion correction processing to video data, using Harris operator black and white gridiron pattern
Angle point correction algorithm, Moravec black and white X-comers correction algorithm, one in SUSAN black and white X-comers correction algorithm
Kind.
The system carries out video registration and fusion, step using translation+variable diameter rotary composite movement model are as follows: respectively according to
The sequence of frames of video of the secondary video data for choosing adjacent two-way video camera synchronous acquisition, by video frame images according to translation+variable diameter
Rotary composite movement model is converted, and is carried out feature extraction and is obtained characteristic point；It is found by progress similarity measurement matched
Characteristic point pair；By matched characteristic point to obtaining image space coordinate conversion parameter；Image is carried out by coordinate conversion parameter to match
Standard is registered in the same coordinate system, and two frame video images after registration are merged to form splicing video image.
Video frame images blending algorithm in the video-splicing module is using the blending algorithm that is directly averaged, weighted average
Blending algorithm, graph cut algorithm, contrast modulation algorithm, linear gradient blending algorithm, multiple melts distance weighting blending algorithm
Hop algorithm, seamless blending algorithm, gaussian pyramid algorithm, laplacian pyramid algorithm and grad pyramid, contrast gold word
One of tower, wavelet algorithm.
The video spliced is limited by the video storage modules with special time period, and compression is packaged into compressing file
Packet, is stored in system disk, for future reference after remaining.
The video display module by the MRI/PET/CT/PET-CT scanning machine frame aperture spliced human body pose it is complete
Scape video real-time display is in the display device of the system.
The invention has the benefit that system uses GPU parallel computation Multi-thread control, each thread division of labor is clear, works
Compared with single, calculation amount is small, multi-threading parallel process, overall arithmetic speed is improved, reaches real-time requirement, while after splicing
Video directly shown on GPU, go to time of video card after saving CPU processing；Distortion correction processing effectively eliminates view
Frequency frame pattern distortion；System multi-channel wide angle cameras pose regulating device can adjust the position and attitude of video camera.System passes through
Multichannel video camera in MRI/PET/CT/PET-CT scanning machine frame aperture carry out video acquire, splice, store and show in real time, energy
Enough meet the direct complete observation of position chanP when doctor is scanned patient.
Detailed description of the invention
Fig. 1 is system diagram of the invention.
Fig. 2 is the system multi-channel wide angle cameras arrangement schematic diagram of the embodiment of the present invention.
Fig. 3 is the system multi-channel wide angle cameras pose regulating device structural schematic diagram of the embodiment of the present invention.
Fig. 4 is the flow diagram of Multi-thread control of the invention.
Fig. 5 is the supplementary explanation schematic diagram of thread 4,5 in Multi-thread control flow diagram of the invention.
Specific embodiment
Invention is further described in detail in the following with reference to the drawings and specific embodiments.
Referring to Fig.1, the present embodiment provides a kind of MRI/PET/CT/PET-CT panoramic video auxiliary systems, comprising: video is same
Walk acquisition module 101, video pre-filtering module 102, video-splicing module 103, video display module 104 and video storage modules
105, wherein video acquisition module 101 is made of multichannel wide angle cameras and its pose regulating device, is used for each road of synchronous acquisition
The video data of video camera；Video pre-filtering module 102 is used to carry out distortion correction processing to video；Video-splicing module 103
For carrying out anastomosing and splicing to each road video overlay region；The video good for display splicing of video display module 104；Video is deposited
Storage module 105 is for storing the video spliced.
Referring to Fig. 2, video acquisition module 101 includes 3 road wide angle cameras: video camera 1,2 and of video camera in the present embodiment
Video camera 3 is arranged in the inside at the top of scanning machine frame aperture.To reach the range that Fig. 2 video camera acquires, No. three video cameras are necessary
Certain pose must be kept, for this purpose, the present embodiment uses a kind of wide angle cameras pose regulating device.Apparatus structure is referring to figure
3, comprising: fixed bracket 301, vertical direction displacement regulating part 302, horizontal direction displacement regulating part 303 and video camera are detachable
Mounting blocks 304.Wherein, fixed bracket 301 is for being fixed on device on the supporting element inside scanning machine frame aperture inner top；It is perpendicular
Histogram is used to adjust the vertical direction displacement of video camera to displacement regulating part 302；Horizontal direction displacement regulating part 303 is used to adjust
The horizontal direction of video camera is displaced；The detachable mounting blocks 304 of video camera include that mounting blocks fix 3041, axis rotation angular adjustment
3042 and vertical direction axis deflection angle adjust 3043 three parts, wherein mounting blocks fix 3041 be used to video camera is detachably pacified
Dress block 304 is fixed on the vertical direction displacement regulating part 302 for adjusting good position and horizontal direction displacement regulating part 303, the peace
Dress block, which fixes 3041, can realize the manual installation and removal of mounting blocks, and convenient for the replacement of video camera in the future, axis rotates angular adjustment
3042, which are used to adjust the axis that camera center line is axis, rotates angle, and vertical direction axis deflection angle adjusts 3043 and is used to adjust to take the photograph
The deflection angle of camera center line and vertical direction.Video acquisition module 101 is used to three road video of synchronous acquisition, while ensuring to adopt
Integrate the video data come as the video data on sustained height, same axis and same plane.
Referring to Fig. 4, Fig. 5, system utilizes GPU parallel computation in the present embodiment, using Multi-thread control, specific steps are as follows:
Step 1: distributing corresponding thread 1,2,3, the process of per thread processing respectively for the video camera 1,2,3 of synchronous acquisition video
It is identical, it is illustrated by taking thread 1 as an example, numbers and adopt containing video camera 1 for the video addition that video camera 1 acquires in thread 1
Collect the label of temporal information, and be successively ranked up according to acquisition time in label, is successively successively distorted according still further to sequence
Correction process generates 1 group of sequence of frames of video to be spliced.
Step 2: in pairs according to video camera neighbouring relations, then being every by distortion correction treated each road video frame
Group video frame respectively distributes a thread again, according to being ordered as the video frame of same time to being registrated and merged in thread,
If the video frame images for thering is center camera to number in video frame pair, image cutting is divided into two, it is special to retain registration
The half range video frame images of sign point aggregation are merged again.In the present embodiment, video camera 2 is center camera, and corresponding 2 groups are waited for
Splice sequence of frames of video, respectively 1 group of sequence of frames of video to be spliced corresponding with adjacent camera 1 and adjacent camera 3 corresponding 3
Group sequence of frames of video pairing to be spliced, distribution thread 4,5 are handled.Since the process of two thread process is identical, it is with thread 4
Example is illustrated, and 1,2 group of sequence of frames of video to be spliced matches two-by-two according to the time in label, to video frame to being registrated,
2 groups of video frame cuttings to be spliced are divided into two, the half range video frame images for retaining the aggregation of registration features point are registrated view with 1 group again
Frequency frame is merged, and 1,2 group of sequence of frames of video that splicing is completed is generated.
Step 3: by 2,3 groups of sequence of frames of video centralized distributions after the completion of fused 1,2 group of sequence of frames of video and fusion
To total thread 6, same acquisition time, label are contained into the frame image of segmentation that video camera 2 is numbered in total thread 6 and are combined into one
As panoramic video frame image, shows according still further to sequence successively output and save panoramic video.
Video pre-filtering module 102 carries out distortion correction processing to video data, using Harris operator black and white gridiron pattern
Angle point correction algorithm.
Video-splicing module 103 carries out video registration and fusion, step using translation+variable diameter rotary composite movement model
Are as follows: the sequence of frames of video for successively choosing the video data of adjacent two-way video camera synchronous acquisition respectively, by video frame images according to
Translation+variable diameter rotary composite movement model is converted, and is carried out feature extraction and is obtained characteristic point；It is looked for by carrying out similarity measurement
To matched characteristic point pair；By matched characteristic point to obtaining image space coordinate conversion parameter；By coordinate conversion parameter into
Row image registration is registered in the same coordinate system, and two frame video images after registration are merged to form splicing video image.
Video frame images blending algorithm in video-splicing module 103 uses laplacian pyramid blending algorithm.
Video display module 104 is by the panorama of human body pose in the MRI/PET/CT/PET-CT scanning machine frame aperture spliced
Video real-time display is in the display device of the system.
The video spliced is limited by video storage modules 105 with special time period, and compression is packaged into compressing file packet, is deposited
Storage is for future reference after remaining in system disk.
The above embodiments are only used to illustrate the present invention, and not limitation of the present invention, in relation to the common of technical field
Technical staff can also make a variety of changes and modification without departing from the spirit and scope of the present invention, therefore all
Equivalent technical solution also belongs to scope of the invention, and scope of patent protection of the invention should be defined by the claims.
Claims (9)
1. a kind of MRI/PET/CT/PET-CT panoramic video auxiliary system, it is characterised in that: the system is applied to, and passes through
When the equipment with scanning machine frame aperture such as MRI, PET, CT, PET-CT carries out the Scanning Detctions such as MRI, PET, CT, PET-CT, in real time
Scanning bed upper human body position and posture in acquisition monitoring scanning machine frame aperture.
2. a kind of MRI/PET/CT/PET-CT panoramic video auxiliary system, which is characterized in that the system comprises: audio video synchronization
Acquisition module, video pre-filtering module, video-splicing module, video storage modules and video display module, wherein audio video synchronization
Acquisition module is made of multichannel wide-angle high-definition camera and its pose regulating device, the video for each road video camera of synchronous acquisition
Data；Video pre-filtering module is used to carry out distortion correction processing to video；Video-splicing module is used for each road video overlay
Region carries out anastomosing and splicing；Video storage modules are for storing the video spliced；Video display module is good for display splicing
Video.
3. a kind of MRI/PET/CT/PET-CT panoramic video auxiliary system, which is characterized in that the system carries out GPU and counts parallel
It calculates, using Multi-thread control, specific steps are as follows:
Step 1: distributing a thread respectively for every road video of synchronous acquisition, contain in each thread for the video addition of acquisition
The label of camera number and acquisition time information, and be successively ranked up according to acquisition time in label, first according still further to sequence
Distortion correction processing is successively carried out afterwards；
Step 2: in pairs according to video camera neighbouring relations, then being every group of view by distortion correction treated each road video frame
Frequency frame respectively distributes a thread again, according to being ordered as the video frame of same time to being registrated and merged in thread, if
Image cutting is then divided into two, retains registration features point by the video frame images for having center camera to number in video frame pair
The half range video frame images of aggregation are merged again；
Step 3: by fused each group video to centralized distribution to total thread, by same acquisition time, identical in total thread
The frame image of segmentation of label camera number is combined into one as panoramic video frame image, according still further to sequence successively output display
And save panoramic video.
4. a kind of MRI/PET/CT/PET-CT panoramic video auxiliary system, which is characterized in that the system uses translation+variable diameter
Rotary composite movement model carries out video registration and fusion, step are as follows: successively choose adjacent two-way video camera synchronous acquisition respectively
Video data sequence of frames of video, video frame images are converted according to translation+variable diameter rotary composite movement model, carry out
Feature extraction obtains characteristic point；Matched characteristic point pair is found by carrying out similarity measurement；By matched characteristic point to
To image space coordinate conversion parameter；It carries out image registration by coordinate conversion parameter to be registered in the same coordinate system, after registration
Two frame video images merge to form splicing video image.
5. a kind of MRI/PET/CT/PET-CT panoramic video auxiliary system, which is characterized in that video described in claim 2 is same
Step acquisition module ensures the synchronous acquisition of video data by sending trigger collection signal to each video camera simultaneously；Included
Multichannel wide angle cameras is respectively provided with a set of pose regulating device, the position of the vertical direction of the adjustable each road video camera of the device
Shifting, the displacement of horizontal direction rotate angle using respective camera center line as the axis of axis and using respective camera center line as axis
With the deflection angle of vertical direction, which may insure that the video data of multichannel video camera acquisition is sustained height, same axis
Video data on line and same plane.
6. a kind of MRI/PET/CT/PET-CT panoramic video auxiliary system, which is characterized in that video preprocessor described in claim 2
Processing module to video data carry out distortion correction processing, using Harris operator black and white X-comers correction algorithm,
One of Moravec black and white X-comers correction algorithm, SUSAN black and white X-comers correction algorithm.
7. a kind of MRI/PET/CT/PET-CT panoramic video auxiliary system, which is characterized in that video as stated in claim 2
Video frame images blending algorithm in splicing module is using the blending algorithm that is directly averaged, weighted average blending algorithm, distance weighting
Blending algorithm, graph cut algorithm, contrast modulation algorithm, linear gradient blending algorithm, multiple blending algorithm, seamless fusion are calculated
Method, gaussian pyramid algorithm, laplacian pyramid algorithm and grad pyramid, contrast pyramid, one in wavelet algorithm
Kind.
8. a kind of MRI/PET/CT/PET-CT panoramic video auxiliary system, which is characterized in that video as stated in claim 2
The video spliced is limited by memory module with special time period, and compression is packaged into compressing file packet, is stored in system disk,
It is for future reference after remaining.
9. a kind of MRI/PET/CT/PET-CT panoramic video auxiliary system, which is characterized in that video as stated in claim 2
Display module is by the panoramic video real-time display of human body pose in the MRI/PET/CT/PET-CT scanning machine frame aperture spliced at this
In the display device of system.
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| CN110688028A (en) * | 2019-09-26 | 2020-01-14 | 京东方科技集团股份有限公司 | Touch control system and method of display screen, electronic device and storage medium |
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| CN114339157A (en) * | 2021-12-30 | 2022-04-12 | 福州大学 | Multi-camera real-time splicing system and method with adjustable observation area |
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