CN111476734B - Method for reducing artifacts in CT reconstructed images - Google Patents
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- CN111476734B CN111476734B CN202010275279.XA CN202010275279A CN111476734B CN 111476734 B CN111476734 B CN 111476734B CN 202010275279 A CN202010275279 A CN 202010275279A CN 111476734 B CN111476734 B CN 111476734B
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000003325 tomography Methods 0.000 claims abstract description 8
- 238000001514 detection method Methods 0.000 claims abstract description 5
- 238000002591 computed tomography Methods 0.000 claims description 11
- 238000001228 spectrum Methods 0.000 abstract description 5
- 230000035515 penetration Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T5/00—Image enhancement or restoration
- G06T5/80—Geometric correction
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T11/00—2D [Two Dimensional] image generation
- G06T11/003—Reconstruction from projections, e.g. tomography
- G06T11/005—Specific pre-processing for tomographic reconstruction, e.g. calibration, source positioning, rebinning, scatter correction, retrospective gating
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10072—Tomographic images
- G06T2207/10081—Computed x-ray tomography [CT]
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Abstract
The present disclosure provides a method for reducing artifacts in CT reconstructed images for detection of straight-edge intersecting structural members, the method comprising: combining the straight-edge intersecting structural member and the compensation block to form a member to be scanned; CT tomography is carried out on the piece to be scanned to form a reconstructed image; wherein: the compensation block comprises contact planes which are respectively attached to two intersecting planes of the straight-side intersecting structural member; after the straight-edge intersecting structural member and the compensation block are combined to form a member to be scanned, the contact planes are respectively attached to the two intersecting planes. In contrast to the case where the compensation block is not added, the difference in X-beam penetration thickness at two adjacent angles is reduced at some special scan angles (e.g., angles substantially parallel to the intersecting planes) and the relative difference in low-spectrum portions in the X-ray beam is reduced, and the energy intensity difference is reduced, so that artifacts due to beam intensity and band energy variations at image reconstruction can be relatively reduced.
Description
Technical Field
The application relates to the technical field of CT detection, in particular to a method for reducing artifacts in CT reconstructed images.
Background
A computed tomography technique (Computing Tomography) reconstructs a tomographic image of the object according to the rayleigh theorem based on the attenuation characteristics of radiation penetrating the object. In order to be able to reconstruct the image of the object under examination according to the image reconstruction algorithm, it is necessary to acquire projection images corresponding to the object under examination under different angles of illumination.
In practical applications, particularly in industrial applications, the radiation sources of CT systems are mostly continuous broad-spectrum X-ray sources; since the low energy portion of the X-ray is more easily absorbed by the object to be detected when penetrating the object to be detected, the low frequency and intermediate frequency portions of the transmitted ray passing through the object to be detected are reduced more as the penetration thickness increases, the average energy of the transmitted ray becomes higher, and the spectrum becomes hard to appear a hardening phenomenon. Because of the hardening phenomenon of the projection rays, beam hardening artifacts are formed at the time of image reconstruction when reconstructing an image of the object to be detected by using the transmission rays.
In order to reduce beam hardening artifacts in reconstructed images, currently existing methods for correcting artifacts are: a hardware-based filter method and a dual-energy method, and a software-based iterative correction method and a curve fitting method. The hardware correction method reduces the spectrum bandwidth of the transmitted rays by reducing the bandwidth of the ray spectrum, thereby reducing the degree of beam hardening artifacts to a certain extent; software-based correction methods can also reduce beam hardening artifacts, but do not essentially address the problem of beam hardening artifacts.
However, in some practical applications, the foregoing hardware-based and software-based correction methods have poor wire harness artifact correction effects on specific structural members, and cannot reduce the artifact effects in the reconstructed image. The specific structural members described above are such as straight edge intersecting structural members.
Disclosure of Invention
The present specification provides a method and compensation block that reduces artifacts in CT reconstructed images to reduce at least some of the artifact problems in straight edge intersection detection.
The present disclosure provides a method for reducing artifacts in CT reconstructed images for detection of straight-edge intersecting structures, comprising:
combining the straight-edge intersecting structural member and the compensation block to form a member to be scanned;
CT tomography is carried out on the piece to be scanned, and a reconstructed image is formed;
wherein: the compensation block comprises two contact planes which are respectively attached to the two intersecting planes of the straight-edge intersecting structural member; after the straight-edge intersecting structural member and the compensation block are combined to form the piece to be scanned, the two contact planes are respectively attached to the two intersecting planes.
Optionally, the compensation block further comprises an inner concave surface; the concave surface is tangential to both of the contact planes.
Optionally, the projection of the concave surface on the CT scanning fault is an arc or an elliptical arc.
Optionally, a length of at least one of the contact planes in the first direction is less than or equal to a length of the intersecting plane correspondingly fitted in the first direction.
Optionally, the projection of the concave surface on the CT scanning fault is a smooth wavy line;
the lengths of the two contact planes in the first direction are equal to the lengths of the corresponding attached intersecting planes in the first direction. Optionally, the lengths of the two contact planes in the first direction are equal to the lengths of the corresponding attached intersecting planes in the first direction;
the compensation block further comprises a non-contact plane; the non-contact plane is a plane intersecting the two contact planes.
Optionally, the material of the compensation block is the same as the material of the straight-edge intersecting structural member.
Optionally, the straight-edge intersecting structural member is provided with a chamfer part between two intersecting planes; the compensation block comprises a profiling surface corresponding to the chamfer portion.
Optionally, the contoured surface is tangential to both of the contact planes.
Optionally, after the straight-edge intersecting structural member and the compensation block are combined to form the member to be scanned, a gap is formed between the area where the profiling surface intersects with the two intersecting planes.
The specification also provides a compensation block capable of reducing artifacts in CT reconstructed images, which is used for detecting straight-edge intersecting structural members; the compensation block comprises two contact planes and an inner concave surface; the included angle of the two contact planes is equal to the included angle between the two intersecting planes of the straight-edge intersecting structural member; the inner concave surface is tangent to both the contact planes and concave towards the intersection area of the two contact planes.
According to the method for reducing the artifacts in the CT reconstructed image, provided by the specification, a compensation block is added between two intersecting planes, and CT fault scanning is performed after a piece to be scanned is formed by the compensation block and a straight-edge intersecting structural member; wherein the two contact planes of the compensation block are respectively attached to the two intersecting planes of the straight-edge intersecting structural member.
In contrast to the case where the compensation block is not added, at some special scan angles (e.g., angles substantially parallel to the intersecting planes), the difference in penetration thickness of the X-beam through the scan is reduced at adjacent two angles, the relative difference in energy intensity at the low-frequency spectrum portion of the X-beam is reduced, and the artifact due to beam intensity and band energy variations at image reconstruction can be relatively reduced.
In the application, the technical schemes can be mutually combined to realize more preferable combination schemes. Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the application, like reference numerals being used to refer to like parts throughout the several views.
FIG. 1 is a schematic cross-sectional view of a straight edge intersecting structure;
FIG. 2 is an image of a cross-section of a straight-sided intersection structure after CT image reconstruction;
FIG. 3 is a flow chart of a method provided by an embodiment that may reduce artifacts in CT reconstructed images;
FIG. 4 is a schematic cross-sectional view of a part to be scanned in an embodiment;
FIG. 5 is a schematic cross-sectional view of a part to be scanned formed using a first type of compensation block;
FIG. 6 is a schematic cross-sectional view of a first type of compensation block;
FIG. 7 is a schematic cross-sectional view of a part to be scanned formed using a second type of compensation block;
FIG. 8 is a view of a straight-sided intersection of structural members after CT image reconstruction in an actual application;
FIG. 9 is a view of an image formed after CT image reconstruction using a straight-edge intersection of compensation blocks in an actual application;
wherein: 11-straight edge intersecting structure, 111-intersecting plane, 112-straight line artifact, 21-compensating block, 211-contact plane, 212-concave surface, 213-non-contact plane.
Detailed Description
The following detailed description of preferred embodiments of the application is made in connection with the accompanying drawings, which form a part hereof, and together with the description of the embodiments of the application, are used to explain the principles of the application and are not intended to limit the scope of the application.
Before introducing the method for reducing the artifacts in the CT reconstructed image provided by the embodiment of the application, firstly, the reasons why the artifacts formed during the image reconstruction cannot be well solved by the current hardware or software method based on the structure of the edge intersecting structural member are introduced.
The straight-edge intersecting structural member mentioned in the embodiment of the present specification is a structural member in which the length of the extending direction is greater (even much greater) than the length of other dimensions, and the projection of two intersecting planes on a section perpendicular to the extending direction or a generatrix is two straight lines. Because the extension direction of the straight-edge intersecting structural member is longer than the extension direction of other dimension directions, the CT image reconstruction method with lower cost and practicability is as follows: and the straight-edge structural member is subjected to multi-angle CT irradiation on the cross section perpendicular to the extending direction or the cross section corresponding to the bus, and a cross section reconstruction image is formed based on the irradiated ray bundle.
FIG. 1 is a schematic cross-sectional view of a straight edge intersecting structure; fig. 2 is an image of a cross-section of a straight-sided intersection structure formed after reconstruction of a CT image. Referring to fig. 1, the solid line indicates the case where the X-ray irradiates the straight-side intersecting structure 11 in the case of one angle, and the broken line indicates the case where the X-ray irradiates the straight-side intersecting structure 11 in the case of another angle.
By comparison, under an angle condition, the middle and low frequency bands of the corresponding X-ray beam are absorbed more in the length direction of the X-ray beam passing through one straight edge of the straight edge intersecting structural member 11, the hardening of the emergent ray beam is more serious, and the energy intensity is weaker; under the condition of another angle, the X-ray beam only passes through one part of the other straight edge of the straight edge intersecting structural member 11, the middle-low frequency band of the corresponding X-ray beam is less absorbed, the absorption of the high-frequency ray is also less, the hardening condition of the emergent ray beam is weaker, and the energy intensity is stronger.
When the angle is adjacent to the other angle, the beam intensity severely-variable region cannot be reconstructed more accurately by using the outgoing beam formed by the angles, so that the linear artifact 112 as shown in fig. 2 is formed. The method provided by the embodiments of the present description is to reduce the straight line artifact 112 as much as possible, as shown in fig. 2.
FIG. 3 is a flow chart of a method provided by an embodiment that may reduce artifacts in CT reconstructed images. As shown in fig. 3, the method provided in this embodiment includes steps S101-S103.
S101: and manufacturing the compensation block according to the straight-edge intersecting structural member.
In a specific application, the compensating block 21 may be a commercially available compensating block 21 that can be directly matched with the straight edge intersecting structural member 11, or may be a special compensating block 21 that is processed according to the straight edge intersecting structural member 11, and the embodiment is not particularly limited.
But the compensation block 21 should meet the following dimensional requirements: the compensation block 21 comprises two contact planes 211, and the included angle of the two contact planes 211 is the same as the included angle of the two intersecting planes 111 of the straight-edge intersecting structural member 11; and both contact planes 211 are planar, which can better (or even completely) conform to the two intersecting planes 111 of the right angle intersecting structure.
S102: and combining the right-angle intersecting structural member and the compensation block to form the to-be-scanned member.
In step S102, the combination of the right angle cross structure and the compensation block 21 is not an arbitrary combination. Instead, it is: so that the two contact planes 211 of the compensation block 21 respectively fit with the two intersecting planes 111 of the straight-edge intersecting structure. Fig. 4 is a schematic cross-sectional view of a part to be scanned in an embodiment. As shown in fig. 4, it can be seen that the compensation block 21 is placed between two intersecting planes 111.
S103: CT tomography is carried out on the piece to be scanned to form a reconstructed image.
In step S103, CT tomography is performed on the workpiece to be scanned, in a direction perpendicular to the extending direction of the straight-side intersecting structural member 11, or in a plane where the generatrix of the straight-side intersecting structural member 11 is located; of course, in some applications, the object to be scanned may be scanned with a certain angle with respect to the aforementioned scanning plane, but the angle should not be too large in consideration of the strength of the X-ray beam and the accuracy requirement of the reconstructed image.
As shown in fig. 4, the solid line represents the case where the X-beam irradiates the object to be scanned in the case of one angle, and the broken line represents the case where the X-beam irradiates the object to be scanned in the case of another adjacent angle.
As can be appreciated from comparing fig. 1, since the compensation block 21 is disposed between the two intersecting planes 111, the difference in penetration thickness of the X-ray beam at some specific scan angle (e.g., an angle substantially parallel to the intersecting planes 111) is reduced, and the difference in the energy intensity is reduced, compared with the case where the compensation block 21 is not added, at one angle compared with the case where the adjacent other angle, at some specific scan angle (e.g., an angle substantially parallel to the intersecting planes 111), the phenomenon of linear artifact 112 of the travel due to the change in the beam intensity and the band energy can be relatively reduced.
The aforementioned linear artifacts 112 may also be not visually perceived in the case of a reasonable arrangement of the compensation block 21, or in combination with software processing methods, hardware processing methods.
In the following, several possible configurations of the compensation block 21 applied to the aforementioned method are described.
Compensation block
Fig. 5 is a schematic cross-sectional view of a member to be scanned formed using a first type of compensation block, and fig. 6 is a schematic cross-sectional view of the first type of compensation block. The cross section in fig. 5 is a cross section perpendicular to the extending direction of the straight intersecting structural member, or a plane in which the generatrix of the straight intersecting structural member lies.
As shown in fig. 5 and 6, the compensating block 21 includes, in addition to the two contact planes 211 described above, an inner concave surface 212, the inner concave surface 212 being curved toward the sharp corner area formed by the two contact planes 211, and the inner concave surface 212 being tangential to both contact planes 211.
As can be appreciated from a combination of fig. 5 and 6, based on the foregoing structure, in the case where the adjacent scanning angle of CT tomography is small, the thickness variation through which the corresponding X-ray beam passes is small, and thus the degree of the artifact can be correspondingly small.
The concave surface 212 may be a concave surface 212 that is projected as an arc or an elliptical arc on a CT scan slice; in practical use, the concave surface 212 is preferably provided as a concave surface 212 projected as an arc in CT scan tomography, considering simplicity of processing.
It should be noted that in the case where the compensation block 21 is of the structure in fig. 5 and 6, the length in the first direction of the two contact planes 211 may be smaller than or equal to the length in the first direction of the corresponding fitted intersecting plane 111.
In practical applications, the length of at least one contact plane 211 in the first direction is preferably equal to the length of the corresponding mating intersection plane 111 in the first direction. In the case where the contact plane 211 is equal to the length of the abutment surface in the first direction, the thickness variation through which the beams of rays of adjacent angles pass may be minimal, so that the degree of artefacts may be low to minimal. It is conceivable that as the length of the contact plane 211 in the first direction increases, the radius of the circular arc or the radius of the elliptical arc of the corresponding concave surface 212 correspondingly increases.
Of course, in some embodiments, where the projection of the concave surface on the CT scan slice is a smooth wavy line, the length of the two contact surfaces in the first direction may be equal to the length of the corresponding conformed intersecting plane in the first direction.
In the case of the compensation block 21 of such a structure, referring to fig. 5 and 6, the intensity of the X-ray beam during CT scanning is determined only by the length of one intersecting edge of the straight-edge intersecting structural member 11, and this intensity can satisfy the requirement of passing through the thickest region of the compensation block 21. Namely: with the structure of fig. 6, the accuracy of the reconstructed image after CT scanning can be achieved without increasing the intensity of the X-ray beam. It should be noted that the aforementioned first direction is a direction projected on the cross section of the straight-side intersecting structural member 11 in the two intersecting planes 111, and the two intersecting planes 111 correspond to one first direction, respectively.
Second kind compensation block
Fig. 7 is a schematic cross-sectional view of a part to be scanned formed using a second type of compensation block. As shown in fig. 7, the compensating block 21 in the second case is a compensating block 21 having a triangular cross section, which includes, in addition to the aforementioned two contact planes 211, a non-contact plane 213 (also referred to as a third plane) intersecting the two contact planes 211, the non-contact plane 213 intersecting both contact planes 211. In addition, the lengths of the two contact planes 211 in the first direction are equal to the lengths of the corresponding bonded intersecting planes 111 in the first direction.
In the foregoing case, the cross section of the part to be scanned is a convex structure. In the case of adjacent irradiation angles when the object to be scanned is CT-scanned, the travel difference of the X-ray beam through the object to be scanned is smaller than the set value, so that the linear artifact 112 may also be reduced better.
In the first two descriptions, the lengths of the two contact planes 211 of the compensation block 21 in the first direction are respectively equal to the lengths of the corresponding intersections 11 in the first direction; according to the principle of the formation of the linear artefacts, the linear artefacts can be substantially eliminated in case the two contact planes of the compensation block have a length in the first direction equal to the corresponding intersecting plane 11. In other applications, such as in conjunction with other correction methods, the length of the compensation block 21 may also be less than the length of the corresponding intersecting plane 111, or greater than the length of the corresponding intersecting plane 111; of course, at this time, the linear artifact may be deformed into another type of artifact or its gray characteristic may be changed.
In each of the foregoing specific applications, in order to reduce the artifacts as much as possible, or to reduce the image quality problems caused by other factors, the material of the compensation block 21 is preferably set to be the same as that of the straight-edge intersecting structural member 11.
In practical application, because of the limitation of the processing technology and the problem of stress concentration, chamfer parts are arranged between the intersecting planes 111 of the straight-edge intersecting structural members 11. Correspondingly, the compensation block 21 may also comprise profiling of the corresponding chamfer. The profiling part can be attached to the chamfering part or a certain gap is reserved between the profiling part and the chamfering part, and the realization of functions in specific application is not affected. Preferably, the profiling surface of the profiling part is tangential to both contact planes 211, so as to reduce the sharp corner area formed by machining.
FIG. 8 is a view of a straight-sided intersection of structural members after CT image reconstruction in an actual application; figure 9 is an image of a straight-edge intersection of compensation blocks after reconstruction of a CT image in an actual application. As can be seen from fig. 8, the CT scan of straight-edge intersecting structure directly forms more obvious artifacts; as can be seen from a comparison of fig. 8 and 9, after the compensation block is added, there is no artifact (or the artifact is not clear, and is not noticeable to the naked eye) in the straight-edge intersecting structure. In addition to providing the foregoing method, the embodiment of the present specification also provides a compensation block 21 applied to the foregoing method, the section of which is shown in fig. 6. The compensating block 21 comprises two contact planes 211 and an inner concave surface 212; the angle between the two contact planes 211 is equal to the angle between the two intersecting planes 111 of the straight edge intersecting structure 11; the concave surface 212 is tangential to both contact planes 211 and concave toward the intersection of the two contact planes 211. The function and the problems to be solved by this compensation block 21 can be found in the previous description and will not be repeated here. The present application is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present application are intended to be included in the scope of the present application.
Claims (7)
1. A method for reducing artifacts in CT reconstructed images for detection of straight-edge intersecting structures, comprising:
combining the straight-edge intersecting structural member and the compensation block to form a member to be scanned;
the material of the compensation block is the same as that of the straight-edge intersecting structural member;
the straight-edge intersecting structural member is provided with a chamfer part between two intersecting planes; the compensation block comprises a profiling surface corresponding to the chamfer part;
the profiling surface is tangent to both contact planes; CT tomography is carried out on the piece to be scanned, and a reconstructed image is formed;
wherein: the compensation block comprises two contact planes which are respectively attached to the two intersecting planes of the straight-edge intersecting structural member; after the straight-edge intersecting structural member and the compensation block are combined to form the piece to be scanned, the two contact planes are respectively attached to the two intersecting planes.
2. The method according to claim 1, characterized in that:
the compensation block further comprises an inner concave surface; the concave surface is tangential to both of the contact planes.
3. The method according to claim 2, characterized in that:
the projection of the inner concave surface on the CT scanning fault is an arc or an elliptical arc.
4. The method according to claim 2, characterized in that:
the length of at least one contact plane in the first direction is smaller than or equal to the length of the corresponding attached intersecting plane in the first direction.
5. The method according to claim 4, wherein:
the projection of the inner concave surface on the CT scanning fault is a smooth wave line;
the lengths of the two contact planes in the first direction are equal to the lengths of the corresponding attached intersecting planes in the first direction.
6. The method according to claim 1, characterized in that:
the lengths of the two contact planes in the first direction are equal to the lengths of the corresponding attached intersecting planes in the first direction;
the compensation block further comprises a non-contact plane; the non-contact plane is a plane intersecting the two contact planes.
7. The method according to claim 1, characterized in that:
after the straight-edge intersecting structural member and the compensation block are combined to form the piece to be scanned, a gap is reserved between the area where the profiling surface intersects with the two intersecting planes.
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