CN104352246A - Cone beam CT (computed tomography) area-of-interest scanning method based on visualization - Google Patents
Cone beam CT (computed tomography) area-of-interest scanning method based on visualization Download PDFInfo
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Abstract
The invention discloses a method for obtaining a high-resolution area-of-interest image through secondary scanning on the basis of visualization. The method comprises the following steps that the positions of a turntable and a radiation source are regulated, the distance is zoomed out, the wider visual field is shown, and an object is subjected to whole primary scanning; the three-dimensional visual reconstruction and the MPR (multiple planar reconstruction) are carried out according to a scanning result; reconstruction results are combined to be displayed, and the area-of-interest position is determined through interaction in the three-dimensional space; meanwhile, the positions of the turntable and the radiation source, the height of the turntable, the position of the object on the turntable and the resolution of imaging equipment are regulated, so that the center of interest is positioned in the center of the turntable, meanwhile, the visual field can just accommodate the area of interest, and the area-of-interest fine scanning is carried out after the regulation. The reconstruction is carried out according to the fine scanning result, and a high- resolution image of the area of interest is obtained. The method has the advantages that the positioning scanning of the area of interest can be realized, meanwhile, the resolution of the region scanning can be obviously improved, simplicity is realized, and the realization is easy.
Description
Technical field
The invention belongs to Cone-Beam CT high-resolution imaging field, be specifically related to a kind of based on visual Cone-Beam CT area-of-interest rescan method.
Background technology
Conventional cone beam CT systems is primarily of radiographic source, and mechanical scanning mechanism, radiation detector, shielding device and electronic computer subsystem are formed.Cone-Beam CT when not destroying sample, can carry out the imaging of high-resolution x-ray to skeleton, tooth, living small animal and various material devices, obtains the three dimensional structure information that sample interior is detailed, thus the 3-D view of display each several part.Adopt cone beam can not only obtain real isotropic volume images, improve spatial resolution, improve ray utilization rate, and in the identical 3D rendering hourly velocity of collection far away faster than fan-beam.
Cone-beam CT imaging resolution mainly affects by radiographic source, flat panel detector.Radiographic source has less scan vision (FOV), and then scanning result resolution is higher, has higher spatial resolution under low coverage, little voxel.In actual applications, overall first slightly scanning often can only be done when traditional method scans, the image resolution ratio obtained when scanning object is larger is poor, if the size of area-of-interest can be determined before scanning starts, then only can scan respective regions, utilize little scan vision to obtain the high-definition picture of area-of-interest.
Summary of the invention
The object of the invention is to propose a kind of method based on visual cone-beam scan object area-of-interest, solve the high resolution observations problem of the object area-of-interest existed in prior art.
Adjustment turntable and radiographic source position, zoom out distance or use larger view lens to produce the large visual field and carry out entirety just scanning to object;
Carry out three-dimensional visualization according to scanning result to rebuild and multiplanar reconstruction (MPR);
Reconstructed results merges display, in three dimensions by determining area-of-interest position alternately;
Adjustment parameter reduces scan vision and object is positioned at turntable center and the visual field holds area-of-interest just simultaneously, carries out area-of-interest close scanning after adjustment;
The high-definition picture obtaining area-of-interest is rebuild according to close scanning result.
Preferably, described rescan adopts different FOV to carry out, and obtain integral position image by large FOV scanning, little FOV obtains high-definition picture according to location positioning scanning.Scanning times is not limited to secondary.
Preferably, described presents overall structure by visual means, and visual means can adopt the multiple method such as volume drawing, iso-surface patch.
Preferably, described parameter adjustment comprises multiple method, is not limited to the distance between adjustment object and radiographic source.
Preferably, described radiographic source and imaging device position can carry out relevant adjustment and replace realizing high-resolution low visual field imaging.
Preferably, described visual employing two dimensional image and 3-D view combine better determines area-of-interest position.
Preferably, the area-of-interest size that described method for visualizing is determined can be converted to object area size in real space.
In the technical scheme of this aspect, the scanning of area-of-interest is undertaken by following flow process: first, examined object is put into Cone-Beam CT, turntable is moved to from radiographic source ultimate range, use the radiographic source of absolute visual field low resolution and imaging device to carry out first time coarse scanning; Secondly, first scanning result carries out visual, finds area-of-interest, by cutting means determination area-of-interest size in visual by two and three dimensions view data; Thirdly, data of interest is converted into position in actual object, and adjustment turntable parameter, radiographic source position and imaging device make area-of-interest data for projection be positioned at imaging device center and be filled to picture equipment region; Finally, visible is carried out for second time scanning result, obtain high-resolution image of interest.
Beneficial effect: the present invention is mainly used in cone-beam scan object area-of-interest, to introducing method for visualizing in original scan method to determine area-of-interest position, thus realizes high-resolution region-of-interest scanning.Relative to scheme of the prior art, advantage of the present invention is:
1. when considering cone-beam scan, area-of-interest is not often in center, can obtain the higher image of resolution, cannot obtain the problem of feature region full resolution pricture under solving original scan method by just sweeping to obtain only to sweep the essence in this region behind position.
2. adopt method for visualizing to determine area-of-interest size fast, by being adjusted turntable, radiographic source and imaging device parameter by visualization result.
3. adopt two and three dimensions visualization result mixed display, make the searching of area-of-interest more accurate.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described:
Fig. 1 just sweeps to obtain overall data schematic diagram the invention process Cone-Beam CT first time;
Fig. 2 is that the invention process Cone-Beam CT changes distance second time sector scanning acquisition area-of-interest high-resolution result schematic diagram;
Fig. 3 is that the invention process Cone-Beam CT changes imaging device second time sector scanning acquisition area-of-interest high-resolution result schematic diagram;
Fig. 4 is for sweeping reconstruction design sketch at the beginning of the invention process mouselet;
Fig. 5 is that the invention process mouselet kidney rescan result rebuilds design sketch;
Fig. 6 is the visual scanning process of the invention process.
Detailed description of the invention
In order to the technical scheme of more detailed statement foregoing invention, following the present inventor lists specific embodiment and carrys out bright technique effect; It is emphasized that these embodiments are not limited to for illustration of the present invention limit the scope of the invention.
The object of the invention is to propose a kind of method based on visual cone-beam scan object area-of-interest, concrete steps (as Fig. 6) can division be:
The first step: adjustment turntable in farthest, position, that object center accepts the visual field at turntable center, radiographic source and imaging device is maximum, carries out scanning at the beginning of first time.
Second step: read in visualization procedure to first scan image data, carries out three-dimensional visualization display to data, while three dimensional display result, and image peripheral subsidiary one and initial data encirclement frame of a size.
3rd step: two and three dimensions image is carried out visual mixed display, by cutting means determination area-of-interest position, cutting result adjusts foundation as next step.
4th step: adjustment parameter reduces scan vision and object is positioned at turntable center and the visual field holds area-of-interest just simultaneously, carries out area-of-interest close scanning after adjustment;
5th step: rescan result is carried out visual, obtains the high-resolution visible result of area-of-interest.
Embodiment 1 mouselet kidney area-of-interest is rebuild
As Fig. 4 and Fig. 5, first open picture place file, total data is loaded into internal memory.Then area-of-interest is obtained according to Cone-Beam CT rescan method of the present invention:
The first step: overall just scanning obtains whole mouselet overall data, and carries out three-dimensional reconstruction by method for visualizing.
Second step: enable multiplanar reconstruction effect and three-dimensional reconstruction effect merges Presentation Function.
3rd step: 3-D clipping, to preliminary region, because this area-of-interest is at mouselet renal tract, is tentatively cropped to relevant position
4th step: mobile multiplanar reconstruction panel data, spotting mobile crop box, to assigned address, determine area-of-interest exact extension.
5th step: fine scanning is carried out to area-of-interest adjustment camera lens, and by result three-dimensional reconstruction.
Above-mentioned example, only for technical conceive of the present invention and feature are described, its object is to person skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalent transformations of doing according to spirit of the present invention or modification, all should be encompassed within protection scope of the present invention.
Claims (5)
1., based on a visual Cone-Beam CT area-of-interest rescan method, comprise the following steps:
Adjustment turntable and radiographic source position, change distance or use larger view lens to produce the large visual field and carry out entirety just scanning to object;
Carry out three-dimensional visualization according to scanning result to rebuild and multiplanar reconstruction MPR;
Reconstructed results merges display, in three dimensions by determining area-of-interest position alternately;
Adjustment parameter reduces scan vision and object is positioned at turntable center and the visual field holds area-of-interest just simultaneously, carries out area-of-interest close scanning after adjustment;
The high-definition picture obtaining area-of-interest is rebuild according to close scanning result.
2. the scan method based on visual Cone-Beam CT area-of-interest according to claim 1, it is characterized in that adopting different visual field FOV to carry out twice sweep, obtain integral position image by large FOV scanning, little FOV obtains high-definition picture according to location positioning scanning.
3. the scan method based on visual Cone-Beam CT area-of-interest according to claim 1, is characterized in that adopting method for visualizing to carry out the location of area-of-interest.
4. the scan method based on visual Cone-Beam CT area-of-interest according to claim 1, is characterized in that adjusting FOV by change radiographic source position, turntable height, object position and imaging device on turntable.
5. the scan method based on visual Cone-Beam CT area-of-interest according to claim 1, is characterized in that minimumly carrying out twice location and fine scanning.
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| CN106469253A (en) * | 2015-08-21 | 2017-03-01 | 西门子医疗有限公司 | Apparatus and method for display location information |
| CN106510747A (en) * | 2016-12-21 | 2017-03-22 | 北京朗视仪器有限公司 | Double-source and double-detector cone beam CT (computed tomography) system |
| CN106955120A (en) * | 2017-03-31 | 2017-07-18 | 北京东软医疗设备有限公司 | Imaging method and imaging system |
| CN107146266A (en) * | 2017-05-05 | 2017-09-08 | 上海联影医疗科技有限公司 | A kind of image rebuilding method, device, medical image system and storage medium |
| CN108701170A (en) * | 2016-03-11 | 2018-10-23 | 索尼公司 | Image processing system and method for three-dimensional (3D) view for generating anatomic part |
| CN111743565A (en) * | 2020-07-15 | 2020-10-09 | 北京永新医疗设备有限公司 | Four-dimensional dynamic tomography positioning method, detector and nuclear medicine equipment |
| CN111795981A (en) * | 2019-04-01 | 2020-10-20 | 通用电气公司 | Method for inspecting a component using computed tomography |
| CN112858129A (en) * | 2019-11-27 | 2021-05-28 | 中国石油天然气股份有限公司 | Rock reservoir space measuring method and device |
| CN114748086A (en) * | 2021-12-21 | 2022-07-15 | 首都医科大学附属北京友谊医院 | CT scanning method and system, electronic device and computer readable storage medium |
| CN115956938A (en) * | 2023-03-15 | 2023-04-14 | 有方（合肥）医疗科技有限公司 | Imaging method and device based on multi-precision reconstruction |
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| CN108701170B (en) * | 2016-03-11 | 2022-02-22 | 索尼公司 | Image processing system and method for generating three-dimensional (3D) views of an anatomical portion |
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| CN111795981A (en) * | 2019-04-01 | 2020-10-20 | 通用电气公司 | Method for inspecting a component using computed tomography |
| CN111795981B (en) * | 2019-04-01 | 2023-12-22 | 通用电气公司 | Method for inspecting components using computer tomography |
| CN112858129A (en) * | 2019-11-27 | 2021-05-28 | 中国石油天然气股份有限公司 | Rock reservoir space measuring method and device |
| CN112858129B (en) * | 2019-11-27 | 2023-09-26 | 中国石油天然气股份有限公司 | Rock reservoir space measuring method and device |
| CN111743565B (en) * | 2020-07-15 | 2023-09-26 | 北京永新医疗设备有限公司 | Four-dimensional dynamic tomographic positioning method, detector and nuclear medicine equipment |
| CN111743565A (en) * | 2020-07-15 | 2020-10-09 | 北京永新医疗设备有限公司 | Four-dimensional dynamic tomography positioning method, detector and nuclear medicine equipment |
| CN114748086A (en) * | 2021-12-21 | 2022-07-15 | 首都医科大学附属北京友谊医院 | CT scanning method and system, electronic device and computer readable storage medium |
| CN114748086B (en) * | 2021-12-21 | 2023-08-08 | 首都医科大学附属北京友谊医院 | CT scanning method and system, electronic device and computer readable storage medium |
| CN115956938A (en) * | 2023-03-15 | 2023-04-14 | 有方（合肥）医疗科技有限公司 | Imaging method and device based on multi-precision reconstruction |
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Application publication date: 20150218 |