CN106909927A - The extraction element and method of trust data, CT imaging systems in CT data for projection - Google Patents
The extraction element and method of trust data, CT imaging systems in CT data for projection Download PDFInfo
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- CN106909927A CN106909927A CN201510979362.4A CN201510979362A CN106909927A CN 106909927 A CN106909927 A CN 106909927A CN 201510979362 A CN201510979362 A CN 201510979362A CN 106909927 A CN106909927 A CN 106909927A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/40—Extraction of image or video features
- G06V10/46—Descriptors for shape, contour or point-related descriptors, e.g. scale invariant feature transform [SIFT] or bags of words [BoW]; Salient regional features
- G06V10/462—Salient features, e.g. scale invariant feature transforms [SIFT]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/40—Extraction of image or video features
- G06V10/44—Local feature extraction by analysis of parts of the pattern, e.g. by detecting edges, contours, loops, corners, strokes or intersections; Connectivity analysis, e.g. of connected components
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V2201/00—Indexing scheme relating to image or video recognition or understanding
- G06V2201/03—Recognition of patterns in medical or anatomical images
- G06V2201/031—Recognition of patterns in medical or anatomical images of internal organs
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V2201/00—Indexing scheme relating to image or video recognition or understanding
- G06V2201/03—Recognition of patterns in medical or anatomical images
- G06V2201/033—Recognition of patterns in medical or anatomical images of skeletal patterns
Abstract
The invention provides a kind of extracting method of trust data in CT data for projection, including：Obtain original CT data for projection；Original CT image is rebuild according to original CT data for projection；Privileged site in detection beginning CT image；Image beyond removing privileged site in original CT image, to obtain the image of privileged site；Image to privileged site carries out orthographic projection to obtain the CT data for projection of privileged site；And, original CT data for projection is subtracted into the CT data for projection of privileged site to obtain the trust data in original CT data for projection.
Description
Technical field
Carried the present invention relates to trust data in x-ray imaging field, more particularly to a kind of CT data for projection
Take device and method, CT imaging systems.
Background technology
In computerized tomography (Computed Tomography, CT) medical imaging technology, from detector
The initial data of collection is arranged in the two-dimensional matrix with probe access as transverse axis, with scan vision as the longitudinal axis,
Used as the original CT data for projection of image reconstruction, also referred to as sinogram, it is substantially on image
The curve winding superposition that each point is formed.Citing is got on very well, if the CT data for projection for collecting is redeveloped into
Size is the image of 512*512, then any point on image, in the matrix of original CT data for projection,
All be a curvilinear path, the amplitude of the curvilinear path depend on this from dummy acquisition pivot away from
From distance is bigger, and amplitude is bigger, and it is being to justify with pivot that the phase of the curvilinear path depends on the point
Position on some circle of the heart.
In original CT data for projection, usually there are low confidence packets, these low confidence packets may
Because many reasons are caused, one of reason is probably that the internal privileged site composition of detection is caused,
The privileged site composition can be metal position or other can cause the incredible structural constituent of data for projection.
For example in certain data point of CT data for projection, not only including trust data, for example with musculature,
The related data such as bone tissue, also including it is for example related to metal position can not letter data, credible number
According to together with insincere data investigation, it is therefore desirable to carry out data reparation to the data point.
It is existing to can not letter data restorative procedure, be all based on detector column interpolated value or row between it is identical
What the interpolation of the interchannel of subtended angle was carried out, the quality of thus obtained reconstruction image can not be carried effectively
Height, and show in-and-out characteristic for different scanned cognition.
The content of the invention
It is an object of the present invention to provide trust data in a kind of CT data for projection extraction element and
Method and CT imaging systems, can produce more accurately CT data for projection and be based on more accurately CT
Data for projection carries out image reconstruction, finally lifts picture quality.
Exemplary embodiment of the invention provides a kind of extracting method of trust data in CT data for projection,
Including：Obtain original CT data for projection；Original CT image is rebuild according to original CT data for projection；Detection
Privileged site in beginning CT image；Image beyond removing privileged site in original CT image, to obtain
Obtain the image of privileged site；Image to privileged site carries out orthographic projection to obtain the CT projections of privileged site
Data；And, original CT data for projection is subtracted into the CT data for projection of privileged site to obtain original CT
Trust data in data for projection.
Exemplary embodiment of the invention provides a kind of extraction element of trust data in CT data for projection,
Including：Initial data acquisition module, image reconstruction module, detection module, privileged site image obtain mould
Block, orthographic projection module and trust data acquisition module.Initial data acquisition module is used to obtain original CT
Data for projection；Image reconstruction module is according to original CT data for projection reconstruction original CT image；Detection mould
Block is used to detect the privileged site in original CT image；Privileged site image collection module is used for original
The image beyond position is determined in removal in CT images, to obtain the image of privileged site；Orthographic projection module, uses
Orthographic projection is carried out in the image to privileged site to obtain the CT data for projection of privileged site；Trust data is obtained
Modulus block is used to for original CT data for projection to subtract the CT data for projection of privileged site to obtain original CT throwing
Trust data in shadow data.
Exemplary embodiment of the invention provide a kind of CT imaging systems, including bulb, detector and
The extraction element of trust data in above-mentioned CT data for projection, bulb is used to launch X-ray to sweep object,
Detector is used to receive through the X-ray of sweep object to produce above-mentioned original CT data for projection.
By following detailed description, accompanying drawing and claim, other features and aspect can be made apparent from.
Brief description of the drawings
It is described for exemplary embodiment of the invention by with reference to accompanying drawing, this may be better understood
Invention, in the accompanying drawings：
The stream of the extracting method of trust data in the CT data for projection that Fig. 1 is provided for one embodiment of the invention
Cheng Tu；
Fig. 2 is the original CT data for projection of acquisition in an illustrative embodiment of the invention；
Fig. 3 is the original CT image of acquisition in an illustrative embodiment of the invention；
Fig. 4 is the image at the metal position of acquisition in an illustrative embodiment of the invention；
Fig. 5 shows the CT data for projection at the metal position obtained in an illustrative embodiment of the invention；
The frame of the extraction element of trust data in the CT data for projection that Fig. 6 is provided for one embodiment of the invention
Figure；
Fig. 7 is the block diagram of the CT imaging systems of offer in one embodiment of the invention.
Specific embodiment
Specific embodiment of the invention explained below, it should be pointed out that in these implementation methods
During specific descriptions, in order to carry out brief and concise description, this specification can not possibly be to actual implementation
All features of mode make description in detail.It is to be understood that in any one implementation method
Actual implementation process in, as during any one engineering project or design object, in order to
The objectives of developer are realized, the limitation related or commercially related in order to meet system usually can
Various specific decision-makings are made, and this also can be from a kind of implementation method to another embodiment
Change.Although moreover, it is to be understood that effort done in this development process may
It is complicated and tediously long, but the ordinary skill of this area related for present disclosure
For personnel, some designs carried out on the basis of the technology contents that the disclosure is disclosed, manufacture or raw
The change such as product is conventional technology, is not construed as content of this disclosure insufficient.
Unless otherwise defined, the technical term or scientific terminology for being used in claims and specification should
There is in by the technical field of the invention the ordinary meaning that the personage of general technical ability understands.The present invention
" first ", " second " and the similar word used in patent application specification and claims
Any order, quantity or importance are not offered as, and are used only to distinguish different parts." one
It is individual " or the similar word such as " " be not offered as quantity limitation, but expression has at least one." bag
Include " or the similar word such as "comprising" mean to appear in " including " or "comprising" before unit
Part or object cover and appear in " including " or "comprising" presented hereinafter element or object and its
Equivalent element, it is not excluded that other elements or object.The similar word such as " connection " or " connected "
Physics or machinery connection is not limited to, is also not necessarily limited to direct or is indirectly connected.
The stream of the extracting method of trust data in the CT data for projection that Fig. 1 is provided for one embodiment of the invention
Cheng Tu.As shown in figure 1, the method is comprised the following steps：
Step S101：Obtain original CT data for projection.
Step S103：Original CT image is rebuild according to above-mentioned original CT data for projection.
Step S105：Detect the privileged site in above-mentioned original CT image.
Step S107:The image beyond above-mentioned privileged site is removed in original CT image, to obtain spy
Determine the image at position.
Step S109：Image to above-mentioned privileged site carries out orthographic projection to obtain the CT throwings of privileged site
Shadow data.
Step S111：The CT data for projection that original CT data for projection is subtracted into privileged site is original to obtain
Trust data in CT data for projection.
The original CT data for projection obtained in step S101 can be, such as from the detection of CT imaging systems
The CT data for projection of device channel acquisition.
Alternatively, data prediction step can also be included before step S103：Above-mentioned original CT is thrown
Shadow data are pre-processed.Therefore in step s 103, the original that directly can be gathered according to probe access
Beginning CT data for projection rebuilds original CT image, is rebuild also dependent on pretreated original CT data for projection
Original CT image.The pretreatment can include, for example, bias (Offset) correction removal dark current, joins
Examine (Reference) channel correcting and remove the stirring of ray energy in each visual field, air (aircal) school
Enter the inhomogeneities of energy, wave beam hardening correcting at the beginning of just removing each passage and remove low energy radiation absorption rate high not
Unanimously ,-In mathematic(al) manipulations cause that data become to add implication of sum etc. in theory.
Fig. 2 is the original CT data for projection of acquisition in an illustrative embodiment of the invention.Horizontal stroke in Fig. 2
Axle represents detection channels, and the longitudinal axis represents scan vision, for each data in original CT data for projection
Point, is all the superposition of the data gathered by corresponding detection channels under corresponding scan vision.
Fig. 3 is the original CT image of acquisition in an illustrative embodiment of the invention.According to original CT
Data for projection is carried out in the original CT image that image reconstruction is obtained, and different tissues composition has different CT
Value, for example, the CT values at metal position are not less than 3500HU under normal circumstances, certainly in different types
In the CT values at metal position that obtain can also be varied from.
Therefore in step S105, privileged site can be determined by detecting the CT values of original CT image
Region where composition, i.e., above-mentioned privileged site, specifically, step S105 may comprise steps of：
The CT values of each pixel in original CT image are compared with default CT values；
The region where pixel by CT values more than above-mentioned default CT values is defined as privileged site.
For example, above-mentioned default CT values can be 3500HU, then can be in the original CT image shown in Fig. 3
Region where the middle pixel by CT values more than 3500HU is defined as metal position.
Alternatively, step S107 can include, will be each beyond privileged site in original CT image
The CT values of pixel are set to 0, in this way, you can in original CT image remove privileged site with
Outer image.
Fig. 4 is the image at the metal position of acquisition in an illustrative embodiment of the invention.Specifically, exist
In step S107, the CT values at the pixel beyond metal position in Fig. 3 can be set to 0, to obtain
The only image including metal position, i.e., the image at metal position as shown in Figure 4.
Fig. 5 shows the CT data for projection at the metal position obtained in an illustrative embodiment of the invention.
In step S109, carrying out orthographic projection by the image to privileged site can obtain the CT throwings of the privileged site
Shadow data, for example, orthographic projection is carried out to the image shown in Fig. 4 can obtain CT data for projection shown in Fig. 5.
In step S111, original CT data for projection is subtracted each other with the CT data for projection of the privileged site for obtaining,
The trust data in original CT data for projection can be obtained, such as in removal Fig. 2 in metallic traces region
Metal shadowing, projected footprint of the remaining nonmetallic substance in this region.Specifically, can proceed as follows：
If data point belongs to the region that metallic traces in Fig. 5 are streaked, for every number in the region
Strong point, data value in Figure 5 is subtracted by its data value (including CT projection values) in fig. 2, is obtained
To the trust data that new data value, the new data value are as extracted in fig. 2.If data point is not
Belong to the region that metallic traces in Fig. 5 are streaked, then retain its data value in fig. 2.
Alternatively, can also include before step S111：Adjust the CT projection numbers of above-mentioned privileged site
According to data magnitude.For example, carrying out arithmetic operation to the data shown in Fig. 5 and original CT data for projection
Before, appropriate Scale (ratio) conversion or weighting treatment can be carried out, with adapt to it is being likely to occur,
The change of the data magnitude that some intermediate computations are brought, in this way, can make privileged site
The data magnitude of CT data for projection and original CT data for projection be adapted.
The frame of the extraction element of trust data in the CT data for projection that Fig. 6 is provided for one embodiment of the invention
Figure.As shown in fig. 6, the device can include initial data acquisition module 610, image reconstruction module 620,
Detection module 630, privileged site image collection module 640, orthographic projection module 650 and trust data
Acquisition module 660.
Initial data acquisition module 610 can be used for obtaining original CT data for projection, such as shown in Fig. 2
Original CT data for projection.Image reconstruction module 620 can be used for being rebuild according to the original CT data for projection
Original CT image, such as original CT image shown in Fig. 3.It is former that detection module 630 can be used for detection
Privileged site in beginning CT image, such as metal position.Privileged site image collection module 640 can be used for
Image beyond removing privileged site in original CT image, to obtain the image of privileged site, for example, obtains
Obtain the image at the metal position shown in Fig. 4.Orthographic projection module 650 can be used for the image to privileged site
Orthographic projection is carried out to obtain the CT data for projection of privileged site, such as the CT at the metal position shown in Fig. 5
Data for projection.Trust data acquisition module 660 can be used for for original CT data for projection subtracting privileged site
CT data for projection obtaining the trust data in the original CT data for projection.
Alternatively, the extraction element of trust data can also be included in advance in original CT data for projection of the invention
Processing module, it can be used for carrying out the original CT data for projection that initial data acquisition module 610 is obtained
Pretreatment, now, image reconstruction module 620 can rebuild according to pretreated original CT data for projection
Original CT image.
Alternatively, above-mentioned detection module 630 can include comparing unit and privileged site determining unit.Than
The CT values of each pixel in original CT image can be compared with default CT values compared with unit；Privileged site
Region where CT values can be more than the pixel of the default CT values by determining unit is defined as privileged site.
Alternatively, privileged site image collection module 640 is above-mentioned specific for that will be in original CT image
The CT values of each pixel beyond position are set to 0, with this way, come in original CT image
Image in addition to privileged site.
Alternatively, above-mentioned privileged site includes metal position.
Alternatively, the extraction element of trust data can also include number in original CT data for projection of the invention
According to magnitude adjusting module, it can be used for projecting number in the CT data for projection to privileged site and original CT
Before computing is carried out, the data magnitude of the CT data for projection of privileged site is adjusted, thrown with the original CT
The data magnitude of shadow data is adapted.
Fig. 7 is the block diagram of the CT imaging systems of offer in one embodiment of the invention, as shown in fig. 7, should
CT imaging systems can in can including bulb 710, detector 720 and above-mentioned CT Raw projection datas
The extraction element of letter data, bulb can be used for launching X-ray to sweep object, and detector is used to receive
Through the X-ray of the sweep object producing original CT data for projection.It is credible in CT Raw projection datas
The extraction element of data can extract the trust data in the original CT data for projection, for carrying out image weight
Build.
In embodiments of the invention, by the original CT image rebuild based on original CT data for projection
Detection privileged site, and the image beyond privileged site is removed to obtain the only image containing the privileged site,
And then the image to the privileged site carries out orthographic projection to obtain incredible data, the incredible data
It can be the projected footprint of privileged site.By subtracting the incredible data in original CT data for projection,
Realize the track of the privileged site that such as metal is removed in the geometric locus of original CT data for projection
Curve, you can extract trust data, therefore embodiments of the invention are realized based in CT data for projection
Projected footprint carries out the reparation of data, compare it is traditional in detector column or row interpolation mode, energy
Enough for image reconstruction provides more reliable data, and then obtain quality image higher.
Some exemplary embodiments are described above.It should be understood, however, that can make each
Plant modification.If for example, described technology be executed in different order and/or if described system,
Component in framework, equipment or circuit is combined and/or by other component or its equivalent by different way
Substitute or supplement, then can realize suitable result.Correspondingly, other embodiment also falls into right and wants
In the protection domain asked.
Claims (13)
1. in a kind of CT data for projection trust data extracting method, including：
Obtain original CT data for projection；
Original CT image is rebuild according to the original CT data for projection；
Detect the privileged site in the original CT image；
The image beyond the privileged site is removed in the original CT image, to obtain the particular portion
The image of position；
Image to the privileged site carries out orthographic projection to obtain the CT data for projection of privileged site；And,
The original CT data for projection is subtracted into the CT data for projection of privileged site to obtain the original CT
Trust data in data for projection.
2. in CT data for projection according to claim 1 trust data extracting method, its feature
It is to detect that the privileged site in the original CT image includes：
The CT values of each pixel in the original CT image are compared with default CT values；
The region where pixel by CT values more than the default CT values is defined as the privileged site.
3. in CT data for projection according to claim 1 trust data extracting method, its feature
It is to remove the image beyond the privileged site in the original CT image to include：
The CT values of each pixel in the original CT image beyond the privileged site are set to 0.
4. in CT data for projection according to claim 1 trust data extracting method, its feature
It is also to include before rebuilding original CT image according to the original CT data for projection：
The original CT data for projection is pre-processed.
5. in CT data for projection according to claim 1 trust data extracting method, its feature
It is that the privileged site includes metal position, the privileged site includes metal position.
6. in CT data for projection according to claim 1 trust data extracting method, its feature
It is also to include before the CT data for projection that the original CT data for projection is subtracted privileged site：
Adjust the data magnitude of the CT data for projection of the privileged site.
7. in a kind of CT data for projection trust data extraction element, including：
Initial data acquisition module, for obtaining original CT data for projection；
Image reconstruction module, for rebuilding original CT image according to the original CT data for projection；
Detection module, for detecting the privileged site in the original CT image；
Privileged site image collection module, for removed in the original CT image privileged site with
Outer image, to obtain the image of the privileged site；
Orthographic projection module, carries out orthographic projection to obtain privileged site for the image to the privileged site
CT data for projection；And,
Trust data acquisition module, the CT for the original CT data for projection to be subtracted privileged site throws
Shadow data are obtaining the trust data in the original CT data for projection.
8. in CT data for projection according to claim 7 trust data extraction element, its feature
It is that the detection module includes：
Comparing unit, for the CT values of each pixel in the original CT image to be compared with default CT values
Compared with；
Privileged site determining unit, for the region where the pixel by CT values more than the default CT values
It is defined as the privileged site.
9. in CT data for projection according to claim 7 trust data extraction element, its feature
It is that the privileged site image collection module is used to that the particular portion will to be in the original CT image
The CT values of each pixel beyond position are set to 0.
10. in CT data for projection according to claim 7 trust data extraction element, its feature
It is that the extraction element of trust data also includes pretreatment module in the original CT data for projection, described
Pretreatment module is used to pre-process the original CT data for projection；Described image rebuilds module to be used for
Original CT image is rebuild according to pretreated original CT data for projection.
The extraction element of trust data, its feature in 11. CT data for projection according to claim 7
It is that the privileged site includes metal position, the privileged site includes metal position.
The extraction element of trust data, its feature in 12. CT data for projection according to claim 1
It is that the extraction element of trust data also includes data magnitude adjusting module in the original CT data for projection,
Data magnitude for adjusting the CT data for projection of the privileged site.
A kind of 13. CT imaging systems, including bulb, detector and any one of claim 7-12 institute
The extraction element of trust data in the CT data for projection stated, the bulb is used to be penetrated to sweep object transmitting X
Line, the detector is used to receive through the X-ray of the sweep object to produce the original CT to project
Data.
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| CN103020928A (en) * | 2012-11-21 | 2013-04-03 | 深圳先进技术研究院 | Metal artifact correcting method of cone-beam CT (computed tomography) system |
| CN104318536A (en) * | 2014-10-21 | 2015-01-28 | 沈阳东软医疗***有限公司 | Method and device for CT image correction |
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|---|---|---|---|---|
| CN102024267A (en) * | 2010-12-20 | 2011-04-20 | 东南大学 | Low-dose computed tomography (CT) image processing method based on wavelet space directional filtering |
| CN103020928A (en) * | 2012-11-21 | 2013-04-03 | 深圳先进技术研究院 | Metal artifact correcting method of cone-beam CT (computed tomography) system |
| CN104318536A (en) * | 2014-10-21 | 2015-01-28 | 沈阳东软医疗***有限公司 | Method and device for CT image correction |
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