CN114983452A - CT spiral reconstruction image artifact removing method and device - Google Patents
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- CN114983452A CN114983452A CN202210513145.6A CN202210513145A CN114983452A CN 114983452 A CN114983452 A CN 114983452A CN 202210513145 A CN202210513145 A CN 202210513145A CN 114983452 A CN114983452 A CN 114983452A
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- A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
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- A61B6/52—Devices using data or image processing specially adapted for radiation diagnosis
- A61B6/5258—Devices using data or image processing specially adapted for radiation diagnosis involving detection or reduction of artifacts or noise
Abstract
The embodiment of the invention discloses a method and a device for removing CT spiral reconstruction image artifacts, wherein first projection data are obtained by carrying out preprocessing on CT projection data with a thread pitch value larger than a preset threshold value; reconstructing the first projection data to obtain a first reconstructed image containing a pitch artifact; expanding the row number of detectors of the CT machine, and carrying out forward projection on the first reconstructed image by adopting the same original parameters as those in CT scanning to obtain second projection data; merging the first projection data and the second projection data to obtain third projection data; and reconstructing the third projection data to obtain a second reconstructed image without the steep-pitch artifact. The method can effectively inhibit the artifacts in the reconstructed image under the condition of coarse pitch scanning.
Description
Technical Field
The present disclosure relates to the field of image reconstruction technologies, and in particular, to a method and an apparatus for removing artifacts in CT helical reconstruction images, a computer device, and a storage medium.
Background
In the third generation ct (computed tomography), the spiral reconstruction method is a commonly used method for users due to the factors of scanning continuity, rapidity, image imaging characteristics, etc. In clinical use, different screw pitch values are needed in helical scanning due to different factors such as doctor's habit, clinical purpose and scanning position. Sometimes to reduce scan time, and lower dose, as large a pitch as possible is required. However, theoretical and practical experience has found that when the pitch value is large, artifacts are generated in the reconstructed image due to data loss.
In view of the above problem in the related art that the missing data may cause artifacts in the reconstructed image due to the large selected pitch value, no effective solution has been proposed at present.
Disclosure of Invention
The embodiment of the invention provides a CT spiral reconstruction image artifact removing method, a CT spiral reconstruction image artifact removing device, computer equipment and a storage medium, which are used for solving the problem that an artifact is generated in a reconstructed image due to data loss caused by a large selected pitch value in the related art.
In order to achieve the above object, in a first aspect of the embodiments of the present invention, there is provided a method for removing an artifact in a CT helical reconstruction image, including:
carrying out preprocessing on the CT projection data with the pitch value larger than a preset threshold value to obtain first projection data;
reconstructing the first projection data to obtain a first reconstructed image containing a pitch artifact;
expanding the row number of detectors of the CT machine, and carrying out forward projection on the first reconstructed image by adopting the same original parameters as those in CT scanning to obtain second projection data;
merging the first projection data and the second projection data to obtain third projection data;
and reconstructing the third projection data to obtain a second reconstructed image without the coarse pitch artifact.
Optionally, in a possible implementation manner of the first aspect, merging the first projection data and the second projection data to obtain third projection data includes:
comparing and analyzing the second projection data with the first projection data;
and respectively expanding the data on two sides exceeding the range of the first projection data in the second projection data to two sides of the first projection data to obtain synthesized third projection data.
Optionally, in a possible implementation manner of the first aspect, reconstructing the first projection data to obtain a first reconstructed image containing a pitch artifact includes:
the reconstruction method comprises the following steps: any one of a spiral half-scan reconstruction method, an extrapolation spiral reconstruction method, and an iterative reconstruction method.
Optionally, in a possible implementation manner of the first aspect, reconstructing the first projection data includes:
and if the first reconstruction image contains the steep pitch artifact, removing the steep pitch artifact by using an image domain method.
Optionally, in a possible implementation manner of the first aspect, the expanding the number of rows of detectors of the CT machine includes:
and if the pitch value is greater than 1.5, expanding the detector row number to enable the expanded pitch value to be less than or equal to 1.5.
In a second aspect of the embodiments of the present invention, a CT helical reconstruction image artifact removing apparatus is provided, including:
the first projection module is used for carrying out preprocessing on the CT projection data with the pitch value larger than a preset threshold value to obtain first projection data;
the first reconstruction module is used for reconstructing the first projection data to obtain a first reconstructed image containing a pitch artifact;
the second projection module is used for expanding the row number of the detector of the CT machine and carrying out orthographic projection on the first reconstructed image by adopting the same original parameters as those in CT scanning so as to obtain second projection data;
a merging module, configured to merge the first projection data and the second projection data to obtain third projection data;
and the second reconstruction module is used for reconstructing the third projection data to obtain a second reconstructed image without the coarse pitch artifact.
Optionally, in a possible implementation manner of the second aspect, the merging module includes:
the comparison unit is used for comparing and analyzing the second projection data and the first projection data;
and the expansion unit is used for respectively expanding the data on the two sides exceeding the range of the first projection data in the second projection data to the two sides of the first projection data to obtain synthesized third projection data.
Optionally, in a possible implementation manner of the second aspect, the second projection module includes:
and the detector row number expansion unit is used for expanding the detector row number if the pitch value is greater than 1.5, so that the expanded pitch value is less than or equal to 1.5.
In a third aspect of the embodiments of the present invention, a computer device is provided, which includes a memory and a processor, where the memory stores a computer program that is executable on the processor, and the processor implements the steps in the above method embodiments when executing the computer program.
A fourth aspect of the embodiments of the present invention provides a readable storage medium, in which a computer program is stored, which, when being executed by a processor, is adapted to carry out the steps of the method according to the first aspect of the present invention and various possible designs of the first aspect of the present invention.
According to the CT spiral reconstruction image artifact removing method, the CT spiral reconstruction image artifact removing device, the computer equipment and the storage medium, the CT projection data with the thread pitch value larger than the preset threshold value are subjected to early processing to obtain first projection data; reconstructing the first projection data to obtain a first reconstructed image containing a pitch artifact; expanding the row number of detectors of the CT machine, and carrying out forward projection on the first reconstructed image by adopting the same original parameters as those in CT scanning to obtain second projection data; merging the first projection data and the second projection data to obtain third projection data; and reconstructing the third projection data to obtain a second reconstructed image without the steep-pitch artifact. The method can effectively inhibit the artifacts in the reconstructed image under the condition of coarse pitch scanning.
Drawings
FIG. 1 is a schematic diagram of a CT light source detector and a scanning pitch;
FIGS. 2 and 3 are schematic diagrams of a first embodiment of a CT helical reconstruction image artifact removal method;
FIG. 4 is a projection data expansion diagram;
fig. 5 is a block diagram of a first embodiment of a CT helical reconstruction image artifact removing apparatus.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in other sequences than those illustrated or described herein.
It should be understood that, in various embodiments of the present invention, the sequence numbers of the processes do not mean the execution sequence, and the execution sequence of the processes should be determined by the functions and the internal logic of the processes, and should not constitute any limitation on the implementation process of the embodiments of the present invention.
It should be understood that in the present application, "comprising" and "having" and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be understood that, in the present invention, "a plurality" means two or more. "and/or" is merely an association describing an associated object, meaning that three relationships may exist, for example, and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "comprises A, B and C" and "comprises A, B, C" means that all three of A, B, C comprise, "comprises A, B or C" means that one of A, B, C comprises, "comprises A, B and/or C" means that any 1 or any 2 or 3 of A, B, C comprises.
It should be understood that in the present invention, "B corresponding to a", "a corresponds to B", or "B corresponds to a" means that B is associated with a, and B can be determined from a. According to A
Determining B does not mean determining B based only on a, but may also be based on a and/or other information. And the matching of A and B means that the similarity of A and B is greater than or equal to a preset threshold value.
As used herein, "if" may be interpreted as "at … …" or "when … …" or "in response to a determination" or "in response to a detection", depending on the context.
The technical solution of the present invention will be described in detail below with specific examples. These several specific embodiments may be combined with each other below, and details of the same or similar concepts or processes may not be repeated in some embodiments.
In the data acquisition process of the existing CT spiral reconstruction, a light source (bulb tube) and a detector synchronously rotate around a bed plate (Z direction), the light source emits X rays, and meanwhile, the bed plate moves horizontally at a constant speed. The ratio of the distance that the bed plate moves while the light source detector rotates one turn to the range of the X-ray in the z direction (the direction in which the bed plate moves) covered by the rotation center is defined as the pitch, as shown in fig. 1.
The invention provides a CT spiral reconstruction image artifact removing method, as shown in the flow charts of fig. 2 and 3, comprising the following steps:
step S110, performing preprocessing on the CT projection data with the pitch value larger than a preset threshold value to obtain first projection data.
In this step, it is found by combining theory and experience that when the pitch value is greater than 1.5, the data is lost and artifacts are generated in the reconstructed image, so the threshold value is set to 1.5, that is: when large-pitch (more than 1.5) acquisition and reconstruction are carried out, M rows of projection data ProjD1 are obtained after data are subjected to early processing; the preset threshold value for the pitch value can also be set according to the actual application requirement, and is not specifically limited herein. The pre-processing steps include, but are not limited to, air correction, hardening correction, normalization, scaling, rebinning, filtering of the projection data.
And S120, reconstructing the first projection data to obtain a first reconstructed image containing the pitch artifact.
In step S120, the reconstruction method includes, but is not limited to, a spiral half-scan reconstruction method, an extrapolation spiral reconstruction method, and an iterative reconstruction method, and any one of them may be selected as a method for reconstructing the first projection data; when the coarse pitch (larger than 1.5) is acquired and reconstructed, the reconstruction generally obtains an image result ImgV containing a lot of coarse pitch artifacts, and therefore, the places with heavy coarse pitch artifacts can be processed by an image domain method (such as threshold segmentation) to reduce the degree of the coarse pitch artifacts. For example: when the large cone angle artifacts are observed to be more and more obvious in the positions where the bones exist, the CT value of tissues around the bones can be judged through the threshold value, the regions lower than a certain threshold value are corrected, and the CT value of the regions is modified into the CT values of the tissues in a certain range in other directions of the bone attachments. Because CT has an additive property when orthographic projection is subsequently performed, and the dummy projection data is given a low weight in the reconstruction of the final image, the accuracy required for correcting the helical artifact at this time is not necessarily high.
And S130, expanding the row number of detectors of the CT machine, and carrying out forward projection on the first reconstructed image by adopting the same original parameters as those in CT scanning to obtain second projection data.
In this step, the number of rows of detectors of the CT machine is expanded as shown in fig. 4, where the z-coverage of the real detector at the rotation center is Cp, the z-direction movement distance of the light source relative to the couch after one rotation is Lp, and the ratio of the distance the couch plate moves while the light source rotates one rotation to the z-direction (couch plate movement direction) coverage of the X-ray at the rotation center is defined as a pitch Lp/Cp. When Lp/Cp >1.5, the virtual detector row number needs to be expanded, namely: the number of detector rows of the CT machine is expanded along the positive direction and the negative direction of a Z axis, wherein the Z axis is parallel to the in-and-out direction of a scanning machine tool, so that the Z coverage range of the expanded virtual detector in the rotation center is C 'p, and Lp/C' p is satisfied to be less than or equal to 1.5. After the row number of the detectors of the CT machine is expanded, when the first reconstructed image is orthographically projected, the orthographic projection needs to be performed according to the same original parameters as those in the CT scan, where the original parameters include a projection angle, an acquisition coordinate, and geometric parameters of the CT system, and the orthographic projection may be performed by using a cone-shaped fan beam or by using a cone-shaped parallel beam.
Step S140, combining the first projection data and the second projection data to obtain third projection data.
In step S140, in the process of merging the second projection data obtained by expanding the number of rows of the virtual detector and the first projection data obtained by the real detector, the two data need to be compared, and then, the two rows of data on two sides of the second projection data beyond the range of the first projection data are respectively expanded to two sides of the first projection data to obtain synthesized third projection data, that is, the proj d2 is supplemented to two sides of the proj d1 to obtain M +2N rows of projection data proj d 3. The pitch corresponding to this case is Lp/Cp ≦ 1.5.
And S150, reconstructing the third projection data to obtain a second reconstructed image without the coarse pitch artifact.
In step S150, after the third projection data is synthesized, an image with a small coarse pitch artifact may be reconstructed according to a normal helical reconstruction algorithm.
In one embodiment, the method further comprises: the influence of the forward projected portion data on the final image can be reduced by adjusting the cone angle weight in the back projection.
In this step, the cone angle weight is that the positions of the different rows of the detector and the position of the light source are expanded to cone angles of different sizes in the z direction, and the greater the cone angle, the greater the contribution of the projection data of the positions to the reconstructed image is, the greater the inaccuracy is. Thus, the contribution from different rows of projection data during the back projection reconstruction is balanced by setting the coefficient weights to decrease with increasing cone angle. The projection data from the edge layer is multiplied by a smaller weight value in the back projection process to reduce its contribution to the pixel values in the reconstructed image.
In addition, the invention does not modify the existing CT structure, and performs normal spiral reconstruction after performing z-direction expansion on the acquired projection data through algorithm design; the reconstruction method used to obtain the forward projection image may be the same as or different from the final back projection algorithm.
The method for removing the CT spiral reconstruction image artifacts provided by the invention obtains first projection data by performing pre-processing on CT projection data with a pitch value larger than a preset threshold; reconstructing the first projection data to obtain a first reconstructed image containing a pitch artifact; expanding the row number of detectors of the CT machine, and carrying out forward projection on the first reconstructed image by adopting the same original parameters as those in CT scanning to obtain second projection data; merging the first projection data and the second projection data to obtain third projection data; and reconstructing the third projection data to obtain a second reconstructed image without the coarse pitch artifact. The invention can reduce artifacts caused by coarse pitch scan reconstruction, can be quickly realized based on the existing reconstruction algorithm, can not change the existing CT system, and saves cost.
An embodiment of the present invention further provides a CT helical reconstruction image artifact removing device, as shown in fig. 5, including:
the first projection module is used for carrying out preprocessing on the CT projection data with the pitch value larger than a preset threshold value to obtain first projection data;
the first reconstruction module is used for reconstructing the first projection data to obtain a first reconstructed image containing a pitch artifact;
the second projection module is used for expanding the row number of the detector of the CT machine and carrying out orthographic projection on the first reconstructed image by adopting the same original parameters as those in CT scanning so as to obtain second projection data;
a merging module, configured to merge the first projection data and the second projection data to obtain third projection data;
a second reconstruction module for obtaining a second reconstructed image without a coarse pitch artifact based on the third projection data by using a conventional spiral reconstruction method
In one embodiment, the merging module includes:
the comparison unit is used for comparing and analyzing the second projection data with the first projection data;
and the expansion unit is used for respectively expanding the data on the two sides exceeding the range of the first projection data in the second projection data to the two sides of the first projection data to obtain synthesized third projection data.
In one embodiment, the second projection module comprises:
and the detector row number expanding unit is used for expanding the detector row number if the pitch value is greater than 1.5, so that the expanded pitch value is less than or equal to 1.5.
The readable storage medium may be a computer storage medium or a communication medium. Communication media includes any medium that facilitates transfer of a computer program from one place to another. Computer storage media may be any available media that can be accessed by a general purpose or special purpose computer. For example, a readable storage medium is coupled to the processor such that the processor can read information from, and write information to, the readable storage medium. Of course, the readable storage medium may also be an integral part of the processor. The processor and the readable storage medium may reside in an Application Specific Integrated Circuits (ASIC). Additionally, the ASIC may reside in user equipment. Of course, the processor and the readable storage medium may also reside as discrete components in a communication device. The readable storage medium may be a read-only memory (ROM), a random-access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.
The present invention also provides a program product comprising execution instructions stored in a readable storage medium. The at least one processor of the device may read the execution instructions from the readable storage medium, and the execution of the execution instructions by the at least one processor causes the device to implement the methods provided by the various embodiments described above.
In the above embodiments of the terminal or the server, it should be understood that the Processor may be a Central Processing Unit (CPU), other general-purpose processors, a Digital Signal Processor (DSP), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present invention may be embodied directly in a hardware processor, or in a combination of the hardware and software modules within the processor.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A CT spiral reconstruction image artifact removing method is characterized by comprising the following steps:
carrying out preprocessing on the CT projection data with the pitch value larger than a preset threshold value to obtain first projection data;
reconstructing the first projection data to obtain a first reconstructed image containing a pitch artifact;
expanding the row number of detectors of the CT machine, and carrying out forward projection on the first reconstructed image by adopting the same original parameters as those in CT scanning to obtain second projection data;
merging the first projection data and the second projection data to obtain third projection data;
and reconstructing the third projection data to obtain a second reconstructed image without the coarse pitch artifact.
2. The method of removing artifacts of CT helical reconstruction image of claim 1, wherein combining said first projection data and said second projection data to obtain third projection data comprises:
comparing and analyzing the second projection data with the first projection data;
and respectively expanding the data on two sides exceeding the range of the first projection data in the second projection data to two sides of the first projection data to obtain synthesized third projection data.
3. The method of claim 1, wherein reconstructing the first projection data to obtain a first reconstructed image containing pitch artifacts includes:
the reconstruction method comprises the following steps: any one of a spiral half-scan reconstruction method, an extrapolation spiral reconstruction method, and an iterative reconstruction method.
4. The method of removing artifacts of CT helical reconstruction image of claim 3, wherein reconstructing the first projection data comprises:
and if the first reconstruction image contains the coarse pitch artifact, removing the coarse pitch artifact by an image domain method.
5. The CT helical reconstruction image artifact removal method as recited in claim 1, wherein the expanding the number of rows of detectors of the CT machine comprises:
and if the pitch value is greater than 1.5, expanding the detector row number to enable the expanded pitch value to be less than or equal to 1.5.
6. A CT helical reconstruction image artifact removing apparatus, comprising:
the first projection module is used for carrying out preprocessing on the CT projection data with the pitch value larger than a preset threshold value to obtain first projection data;
the first reconstruction module is used for reconstructing the first projection data to obtain a first reconstructed image containing a pitch artifact;
the second projection module is used for expanding the row number of the detector of the CT machine and carrying out orthographic projection on the first reconstructed image by adopting the same original parameters as those in CT scanning so as to obtain second projection data;
a merging module, configured to merge the first projection data and the second projection data to obtain third projection data;
and the second reconstruction module is used for reconstructing the third projection data to obtain a second reconstructed image without the coarse pitch artifact.
7. The CT helical reconstruction image artifact removal device of claim 6, wherein the merging module comprises:
the comparison unit is used for comparing and analyzing the second projection data with the first projection data;
and the expansion unit is used for respectively expanding the data on the two sides exceeding the range of the first projection data in the second projection data to the two sides of the first projection data to obtain synthesized third projection data.
8. The CT helical reconstruction image artifact removal device of claim 6, wherein the second projection module comprises:
and the detector row number expanding unit is used for expanding the detector row number if the pitch value is greater than 1.5, so that the expanded pitch value is less than or equal to 1.5.
9. A computer device comprising a memory and a processor, the memory storing a computer program operable on the processor, wherein the processor implements the steps of the method of any one of claims 1 to 5 when executing the computer program.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 5.
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