CN111053566B - X-ray image reconstruction method and device, X-ray imaging system and medium - Google Patents
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
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Abstract
The embodiment of the invention discloses an X-ray image reconstruction method, an X-ray image reconstruction device, an X-ray imaging system and a medium, wherein the method comprises the following steps: acquiring actual projection data and an exposure condition corresponding to the actual projection data; inquiring the thickness combination of the bone and the tissue corresponding to the actual projection data and the exposure condition from a storage unit, and determining correction projection data corresponding to the thickness combination of the bone and the tissue to update the actual projection data; and carrying out image reconstruction by using the updated actual projection data to obtain a target medical image. The problem that the existing hardening artifact correction method in X-ray image reconstruction cannot give consideration to both correction speed and imaging quality is solved.
Description
Technical Field
The embodiment of the invention relates to the field of medical images, in particular to an X-ray image reconstruction method, an X-ray image reconstruction device, an X-ray imaging system and a medium.
Background
When the multi-energy photons pass through the object, the obtained actual projection value gradually deviates from the ideal value along with the increase of the thickness of the object, so that the reconstructed image presents cup-shaped artifacts, as shown in fig. 1A, wherein the circular image on the right side of fig. 1A is the ideal reconstructed result of the scanned object, the circular image on the left side of fig. 1A is the actual reconstructed result of the projection data corresponding to the scanned object, and the middle part of the image on the left side can be seen to have obvious shadow. Fig. 1B is a gray scale distribution diagram of the horizontal center lines of the two circular images in fig. 1A. It can be seen that the gray value of the middle portion of the horizontal center line of the left circular image is lower than that of the right circular image. Therefore, the hardening artifacts need to be corrected, and the reconstructed image has better image quality.
For hardening artifact correction, in the prior art, either the projection value of the bone is considered as soft tissue, or the reconstructed image needs to be subjected to bone segmentation, then the bone part is subjected to forward projection, and the corrected projection value corresponding to the bone is determined according to the forward projection result, wherein the reconstructed image quality is poor, and the time consumption of the two-time image reconstruction and the bone segmentation of the latter is long. Therefore, the conventional hardening artifact correction method has the problem that the correction speed and the imaging quality cannot be simultaneously achieved.
Disclosure of Invention
The embodiment of the invention provides an X-ray image reconstruction method, an X-ray image reconstruction device, an X-ray imaging system and a storage medium, and solves the problem that the existing hardening artifact correction method cannot give consideration to both correction speed and imaging quality.
In a first aspect, an embodiment of the present invention provides an X-ray image reconstruction method, including:
acquiring actual projection data and an exposure condition corresponding to the actual projection data;
inquiring the thickness combination of the bone and the tissue corresponding to the actual projection data and the exposure condition from a storage unit, and determining correction projection data corresponding to the thickness combination of the bone and the tissue to update the actual projection data;
and carrying out image reconstruction by using the updated actual projection data to obtain a target medical image.
In a second aspect, an embodiment of the present invention further provides an X-ray image reconstruction apparatus, including:
the acquisition module is used for acquiring actual projection data and exposure conditions corresponding to the actual projection data;
the updating module is used for inquiring the thickness combination of the bone and the tissue corresponding to the actual projection data and the exposure condition from a storage unit and determining the correction projection data corresponding to the thickness combination of the bone and the tissue so as to update the actual projection data;
and the reconstruction module is used for carrying out image reconstruction on the updated actual projection data to obtain a target medical image.
In a third aspect, an embodiment of the present invention provides an X-ray imaging system, including:
the scanning bed is used for bearing a scanning object;
the scanning device is used for carrying out imaging scanning on the scanning object to obtain actual projection data;
the processor is used for acquiring actual projection data and exposure conditions corresponding to the actual projection data; inquiring the thickness combination of the bone and the tissue corresponding to the actual projection data and the exposure condition from a storage unit, and determining correction projection data corresponding to the thickness combination of the bone and the tissue to update the actual projection data; and carrying out image reconstruction by using the updated actual projection data to obtain a target medical image.
In a fourth aspect, embodiments of the present invention provide a storage medium containing computer-executable instructions for performing the method of X-ray image reconstruction according to any of the embodiments when executed by a computer processor.
The technical scheme of the X-ray image reconstruction method provided by the embodiment of the invention comprises the following steps: acquiring actual projection data and exposure conditions corresponding to the actual projection data; inquiring the thickness combination of the bone and the tissue corresponding to the actual projection data and the exposure condition from the storage unit, and determining the corrected projection data corresponding to the thickness combination of the bone and the tissue so as to update the actual projection data; and carrying out image reconstruction by using the updated actual projection data to obtain a target medical image. Meanwhile, hardening correction of bones and tissues is respectively completed, and compared with the prior art, correction deviation caused by taking the bones as a part of soft tissues when water hardening correction and bone hardening correction are respectively carried out is avoided, the accuracy of updated actual projection data is greatly improved, and the quality of a target medical image is improved; and the hardening correction of the tissues and the bones can be completed only by once image reconstruction, and the final target medical image is obtained, so that the hardening correction efficiency is greatly improved, and the hardening correction time is shortened.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1A shows an actual reconstruction result (left) and an ideal reconstruction result (right) of a scanned object according to the background art of the present invention;
fig. 1B is a gray distribution diagram of central lines of an actual reconstruction result and an ideal reconstruction result of a scanned object according to the background art of the present invention;
FIG. 2 is a flowchart of an X-ray image reconstruction method according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a configuration interface according to an embodiment of the present invention;
fig. 4 is a block diagram of an X-ray image reconstruction apparatus according to a second embodiment of the present invention;
fig. 5A is a block diagram of an X-ray imaging system according to a third embodiment of the present invention;
fig. 5B is a block diagram of a further X-ray imaging system according to a third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described through embodiments with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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.
Example one
Fig. 2 is a flowchart of an X-ray image reconstruction method according to an embodiment of the present invention. The technical scheme of the embodiment is suitable for the case of performing hardening artifact correction on projection data. The method can be executed by an X-ray image reconstruction device provided by the embodiment of the invention, and the device can be realized in a software and/or hardware mode and is configured to be applied in a processor. The method specifically comprises the following steps:
s101, acquiring actual projection data and exposure conditions corresponding to the actual projection data.
For an X-ray apparatus, such as Digital Radiography (DR), exposure conditions of a radiation source need to be set before imaging a scanning object. The exposure conditions include, but are not limited to, the high voltage (kV), current (mA), and duration of exposure(s) of the radiation source. In some embodiments, the exposure conditions also include a shooting protocol, such as a scan angle of the radiation source, and the like.
During imaging scanning, the ray source outputs X rays to a scanning object under an exposure condition, the X rays penetrate through the scanning object and then enter the detector, and the detector generates actual projection data according to the received X rays penetrating through the scanning object. It will be appreciated that the actual projection data comprises a number of actual projection values.
S102, inquiring the thickness combination of the bone and the tissue corresponding to the actual projection data and the exposure condition from the storage unit, and determining the corrected projection data corresponding to the thickness combination of the bone and the tissue to update the actual projection data.
When the X-ray imaging device performs imaging scanning on a scanning object, the output ray not only passes through tissues, but also passes through bones. Due to the different densities of tissue and bone, the absorption capacities of the tissue and bone to the radiation under the same exposure condition are different, wherein the exposure condition is mainly reflected in the energy of the radiation. In addition, the scanning beam output by the imaging device typically contains multiple energies of X-rays, with lower energy X-rays being more readily absorbed by tissue and bone than higher energy X-rays.
The bone unit projection value and the tissue unit projection value can be regarded as being constant under the same exposure condition, and the corresponding projection values are constant under the condition that the bone thickness and the tissue thickness corresponding to each bone-tissue thickness combination are constant. In the storage unit, the correspondence between the bone-tissue thickness combination and the actual projection value is stored in the form of a mapping table. Thus, after the actual projection values are obtained, the bone-tissue thickness combinations corresponding to the actual projection values of the actual projection data can be located in the mapping table.
The bone unit projection value is a projection value corresponding to the bone with the unit thickness penetrated by the single-energy X-ray, and the tissue unit projection value is a projection value corresponding to the tissue with the unit thickness penetrated by the single-energy X-ray.
It should be noted that the tissue in this embodiment includes soft tissue, which has a density less than that of bone.
In creating the mapping table, the present embodiment simulates soft tissue of a human body using PMMA (polymethyl methacrylate) or water, simulates bone of the human body using a calcium carbonate material or a material having similar properties, and models, for each exposure condition, a modeled projection value corresponding to a different thickness combination of calcium carbonate and PMMA or a modeled projection value corresponding to a different thickness combination of calcium carbonate and water to establish a mapping relationship between the thickness combination of bone-tissue and the modeled projection value. During the modeling process, the bones and tissues are incremented at preset thickness intervals, such as 0.5cm, 1cm, etc., as shown in table 1.
Table 1 mapping table under certain exposure conditions
In some embodiments, a mapping table corresponding to each exposure condition is established for each scanning part protocol, so that the mapping table can be determined according to the exposure condition and the scanning part protocol, each projection value of the actual projection data is located in the mapping table, and the corresponding bone-tissue thickness combination is determined according to the projection value, so as to ensure that the bone-tissue thickness combination corresponding to each projection value is unique. For this situation, before the X-ray imaging device scans, the user is required to input or select a scan region protocol in a scan protocol configuration option of the configuration interface and input or select an exposure condition in an exposure configuration option (see fig. 3), so that the processor of the X-ray imaging device determines a mapping table corresponding to actual projection data according to the scan region protocol and the exposure condition. The mapping table corresponding to the actual projection data can be determined through simple information configuration, and the complexity and time of a scanning configuration process cannot be increased.
Because the data in the mapping table is obtained based on the motifs, namely, the scanning object corresponding to the modeling projection value in the mapping table is the motif. Each actual projection value may not be directly located in the mapping table in view of slight differences between the phantom and the actual human body, and/or individual differences between different human bodies. Therefore, in some embodiments, the mapping table corresponding to the actual projection data is searched for a modeled projection value having the smallest difference from the actual projection value, and then the thickness combination of the bone and the tissue corresponding to the modeled projection value is used as the thickness combination of the bone and the tissue corresponding to the actual projection value.
For the same exposure condition, the bone unit projection value and the tissue unit projection value can be regarded as being invariant, so that in the case where the exposure condition and each bone-tissue thickness combination are determined, the corresponding corrected projection value of the bone-tissue thickness combination can be expressed as: the corrected projection value is bone unit projection value × bone thickness + tissue unit projection value × tissue thickness. After the correction projection value corresponding to the thickness combination of the skeleton and the tissue is determined, the actual projection data can be updated according to the correction projection value, so that the skeleton projection value and the tissue projection value in the actual projection data can be corrected simultaneously and respectively.
In order to improve the correction speed of the hardening artifact, in some embodiments, the modeling correction projection value corresponding to each bone-tissue thickness combination is directly added to the mapping table, so that after the bone-tissue thickness combination is determined, the modeling correction projection value corresponding to the determined bone-tissue thickness combination can be used as the correction projection value corresponding to the determined bone-tissue thickness combination to update the actual projection data.
And S103, carrying out image reconstruction by using the updated actual projection data to obtain a target medical image.
And after the updated actual projection data are obtained, carrying out image reconstruction on the updated actual projection data to obtain a target medical image. Therefore, the hardening correction of the tissues and the bones can be completed only by one-time image reconstruction, the final target medical image is obtained, the hardening correction efficiency is greatly improved, and the hardening correction time is shortened. Because the updated actual projection data has higher accuracy, the image treatment of the target medical image is very high, and the clinical diagnosis effect is improved.
The technical scheme of the X-ray image reconstruction method provided by the embodiment of the invention comprises the following steps: acquiring actual projection data and exposure conditions corresponding to the actual projection data; inquiring the thickness combination of the bone and the tissue corresponding to the actual projection data and the exposure condition from the storage unit, and determining the corrected projection data corresponding to the thickness combination of the bone and the tissue so as to update the actual projection data; and carrying out image reconstruction by using the updated actual projection data to obtain a target medical image. Meanwhile, hardening correction of bones and tissues is respectively completed, and compared with the prior art, correction deviation caused by taking the bones as a part of soft tissues when water hardening correction and bone hardening correction are respectively carried out is avoided, the accuracy of updated actual projection data is greatly improved, and the quality of a target medical image is improved; and the hardening correction of the tissues and the bones can be completed only by once image reconstruction, and the final target medical image is obtained, so that the hardening correction efficiency is greatly improved, and the hardening correction time is shortened.
Example two
Fig. 4 is a block diagram of an X-ray image reconstruction apparatus according to an embodiment of the present invention. The apparatus is used for executing the X-ray image reconstruction method provided by any of the above embodiments, and the apparatus can be implemented by software or hardware. The device includes:
an obtaining module 11, configured to obtain actual projection data and an exposure condition corresponding to the actual projection data;
an updating module 12, configured to query, from a storage unit, the actual projection data and a thickness combination of the bone and the tissue corresponding to the exposure condition, and determine corrected projection data corresponding to the thickness combination of the bone and the tissue to update the actual projection data;
and the reconstruction module 13 is configured to perform image reconstruction with the updated actual projection data to obtain a target medical image.
Optionally, the updating module 11 may be configured to, after the thickness combination of bone and tissue is determined, determine, according to the thickness combination of bone and tissue and the bone unit projection value and the tissue unit projection value corresponding to the used exposure condition, a corrected projection value corresponding to the thickness combination of bone and tissue corresponding to each actual projection value, so as to update the actual projection data.
Optionally, the updating module 11 is configured to determine, in the storage unit, a bone-tissue thickness combination corresponding to the modeled projection value with the smallest difference between the actual projection values in the mapping table, and use the bone-tissue thickness combination as the bone-tissue thickness combination corresponding to the actual projection value.
According to the technical scheme of the X-ray image reconstruction device provided by the embodiment of the invention, the actual projection data and the exposure conditions corresponding to the actual projection data are obtained through the obtaining module; inquiring the thickness combination of the bone and the tissue corresponding to the actual projection data and the exposure condition from the storage unit through an updating module, and determining the corrected projection data corresponding to the thickness combination of the bone and the tissue so as to update the actual projection data; and carrying out image reconstruction by using the updated actual projection data through a reconstruction module to obtain a target medical image. Meanwhile, hardening correction of bones and tissues is respectively completed, and compared with the prior art, correction deviation caused by taking the bones as a part of soft tissues when water hardening correction and bone hardening correction are respectively carried out is avoided, the accuracy of updated actual projection data is greatly improved, and the quality of a target medical image is improved; and the hardening correction of the tissues and the bones can be completed only by once image reconstruction, and the final target medical image is obtained, so that the hardening correction efficiency is greatly improved, and the hardening correction time is shortened.
The X-ray image reconstruction device provided by the embodiment of the invention can execute the X-ray image reconstruction method provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
EXAMPLE III
Fig. 5A is a schematic structural diagram of an X-ray imaging system provided in an embodiment of the present invention, the system includes a scanning bed 201, a scanning device 202, and a processor 203, where the scanning bed 201 is used for carrying a scanning object; the scanning device 202 is used for performing imaging scanning on a scanning object to obtain actual projection data; the processor 203 is configured to obtain actual projection data and an exposure condition corresponding to the actual projection data; inquiring the thickness combination of the bone and the tissue corresponding to the actual projection data and the exposure condition from the storage unit, and determining the corrected projection data corresponding to the thickness combination of the bone and the tissue so as to update the actual projection data; and carrying out image reconstruction by using the updated actual projection data to obtain a target medical image.
For X-ray devices, such as DR, the scanning apparatus includes a source of radiation and a detector. Before imaging a scanned object using a scanning apparatus, exposure conditions need to be configured for the radiation source. The exposure conditions include, but are not limited to, the high voltage (kV), current (mA), and duration of exposure(s) of the radiation source. In some embodiments, the exposure conditions further include a shooting protocol, such as a scan angle of the radiation source and/or a shooting location, and the like. During imaging scanning, the ray source outputs X rays to a scanning object under an exposure condition, the X rays penetrate through the scanning object and then enter the detector, and the detector generates actual projection data according to the received X rays penetrating through the scanning object. It will be appreciated that the actual projection data comprises a number of actual projection values.
The radiation output by the source passes not only through the tissue but also through the bone. Due to the different densities of tissue and bone, the absorption capacities of the tissue and bone to the radiation under the same exposure condition are different, wherein the exposure condition is mainly reflected in the energy of the radiation. In addition, the scanning beam output by the radiation source typically contains multiple energies of X-rays, with lower energy X-rays being more readily absorbed by tissue and bone than higher energy X-rays.
For the same exposure condition, the bone unit projection value and the tissue unit projection value can be regarded as being unchanged, under the condition that the bone thickness and the tissue thickness corresponding to each bone-tissue thickness combination are constant, the corresponding projection value is constant, and in the storage unit, the corresponding relation between the bone-tissue thickness combination and the actual projection value is stored in a mapping table mode. Thus, after the actual projection values are obtained, the bone-tissue thickness combinations corresponding to the actual projection values of the actual projection data can be located in the mapping table.
The bone unit projection value is a projection value corresponding to the bone with the unit thickness penetrated by the single-energy X-ray, and the tissue unit projection value is a projection value corresponding to the tissue with the unit thickness penetrated by the single-energy X-ray.
It should be noted that the tissue in this embodiment includes soft tissue, which has a density less than that of bone.
In some embodiments, a mapping table corresponding to each exposure condition is established for each scanning site protocol, so that the processor 203 can determine the mapping table according to the exposure condition and the scanning site protocol, locate each projection value of the actual projection data in the mapping table, and determine the corresponding bone-tissue thickness combination according to the projection value, so as to ensure that the bone-tissue thickness combination corresponding to each projection value is unique.
Because the data in the mapping table is obtained based on the motifs, namely, the scanning object corresponding to the modeling projection value in the mapping table is the motif. Each actual projection value may not be directly located in the mapping table in view of slight differences between the phantom and the actual human body, and/or individual differences between different human bodies. Therefore, in some embodiments, the mapping table corresponding to the actual projection data is searched for a modeled projection value having the smallest difference from the actual projection value, and then the thickness combination of the bone and the tissue corresponding to the modeled projection value is used as the thickness combination of the bone and the tissue corresponding to the actual projection value.
For the same exposure condition, the bone unit projection value and the tissue unit projection value can be regarded as being invariant, so that in the case where the exposure condition and each bone-tissue thickness combination are determined, the corresponding corrected projection value of the bone-tissue thickness combination can be expressed as: the corrected projection value is bone unit projection value × bone thickness + tissue unit projection value × tissue thickness. After the correction projection value corresponding to the thickness combination of the skeleton and the tissue is determined, the processor can update the actual projection data according to the correction projection value, so that the skeleton projection value and the tissue projection value in the actual projection data can be corrected simultaneously and respectively.
In order to improve the correction speed of the hardening artifact, in some embodiments, the modeling correction projection value corresponding to each bone-tissue thickness combination is directly added to the mapping table, so that after the bone-tissue thickness combination is determined, the modeling correction projection value corresponding to the determined bone-tissue thickness combination can be used as the correction projection value corresponding to the determined bone-tissue thickness combination to update the actual projection data.
Further, as shown in fig. 5B, the system further includes an output device 206. The output device 206 may include a display device such as a display screen, for example, a display screen of a user terminal, for outputting a configuration interface and a display interface. The configuration interface is used for outputting scan site protocol configuration options and exposure condition configuration options, as shown in fig. 3. After the user inputs or selects a scanning part protocol, such as a brain scanning protocol, a chest scanning protocol, and an abdomen scanning protocol, in the scanning part protocol configuration option, and inputs or selects an exposure condition in the exposure condition configuration option, the processor 203 queries a mapping table corresponding to the exposure condition and the scanning part protocol from the database according to the configured scanning part protocol and the exposure condition, that is, the mapping table corresponding to the actual projection data. Accordingly, after obtaining the updated actual projection data, the processor 203 performs image reconstruction on the updated actual projection data, and outputs the reconstructed target medical image to the display interface of the output device 204. Because the updated actual projection data has higher accuracy, the image quality of the target medical image is very high, and the clinical diagnosis effect is improved.
As shown in fig. 5B, the system further includes a memory and an input device, the memory 204 is a computer-readable storage medium for storing software programs, computer-executable programs, and modules, such as program instructions/modules (e.g., the obtaining module 11, the updating module 12, and the reconstructing module 13) for reconstructing X-ray images in the embodiment of the present invention. The processor 203 executes various functional applications of the apparatus and data processing by running software programs, instructions and modules stored in the memory 204, i.e. implements the above-described X-ray image reconstruction method.
The memory 204 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function. Further, the memory 204 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, the memory 204 may further include memory located remotely from the processor 203, which may be connected to the device over a network. Examples of such networks include, but are not limited to, the internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 205 may be used to receive input numeric or character information and generate key signal inputs relating to user settings and function controls of the apparatus.
Example four
Embodiments of the present invention also provide a storage medium containing computer-executable instructions which, when executed by a computer processor, perform a method of X-ray image reconstruction, the method comprising:
acquiring actual projection data and an exposure condition corresponding to the actual projection data;
inquiring the thickness combination of the bone and the tissue corresponding to the actual projection data and the exposure condition from a storage unit, and determining correction projection data corresponding to the thickness combination of the bone and the tissue to update the actual projection data;
and carrying out image reconstruction by using the updated actual projection data to obtain a target medical image.
Of course, the storage medium provided by the embodiments of the present invention contains computer-executable instructions, and the computer-executable instructions are not limited to the method operations described above, and may also perform related operations in the X-ray image reconstruction method provided by any embodiments of the present invention.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which may be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the X-ray image reconstruction method according to the embodiments of the present invention.
It should be noted that, in the embodiment of the X-ray image reconstruction apparatus, the included units and modules are only divided according to the functional logic, but not limited to the above division as long as the corresponding functions can be realized; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (9)
1. An X-ray image reconstruction method, comprising:
acquiring actual projection data and an exposure condition corresponding to the actual projection data, wherein the actual projection data comprises a plurality of actual projection values;
inquiring the thickness combination of the bone and the tissue corresponding to the actual projection data and the exposure condition from a storage unit, and determining a correction projection value corresponding to the thickness combination of the bone and the tissue corresponding to each actual projection value according to the thickness combination of the bone and the tissue and a bone unit projection value and a tissue unit projection value corresponding to the used exposure condition so as to update the actual projection data, wherein the bone unit projection value is a projection value corresponding to a bone through which the unienergy X-ray passes through unit thickness, and the tissue unit projection value is a projection value corresponding to a tissue through which the unienergy X-ray passes through unit thickness;
and carrying out image reconstruction by using the updated actual projection data to obtain a target medical image.
2. The method of claim 1, wherein the exposure conditions include high voltage of a radiation source, current, and duration of exposure.
3. The method of claim 2, wherein the exposure condition comprises a shooting protocol.
4. The method according to claim 1, characterized in that in the storage unit the correspondence of the bone-tissue thickness combination and the actual projection values is stored in the form of a mapping table.
5. The method according to claim 4, characterized in that in the storage unit, the thickness combination of bone-tissue corresponding to the modeled projection value in the mapping table with the smallest difference between the actual projection values is determined and used as the thickness combination of bone-tissue corresponding to said actual projection values.
6. An X-ray image reconstruction apparatus, characterized by comprising:
the system comprises an acquisition module, a processing module and a processing module, wherein the acquisition module is used for acquiring actual projection data and an exposure condition corresponding to the actual projection data, and the actual projection data comprises a plurality of actual projection values;
an updating module, configured to query the actual projection data and a thickness combination of bone and tissue corresponding to the exposure condition from a storage unit, and determine a corrected projection value corresponding to the thickness combination of bone and tissue corresponding to each actual projection value according to the thickness combination of bone and tissue and a bone unit projection value and a tissue unit projection value corresponding to the used exposure condition, so as to update the actual projection data, where the bone unit projection value is a projection value corresponding to a bone through which a unienergy X-ray passes through a unit thickness, and the tissue unit projection value is a projection value corresponding to a tissue through which a unienergy X-ray passes through a unit thickness;
and the reconstruction module is used for carrying out image reconstruction on the updated actual projection data to obtain a target medical image.
7. An X-ray imaging system, comprising:
the scanning bed is used for bearing a scanning object;
the scanning device is used for carrying out imaging scanning on the scanning object to obtain actual projection data;
the system comprises a processor, a data processing unit and a data processing unit, wherein the processor is used for acquiring actual projection data and an exposure condition corresponding to the actual projection data, and the actual projection data comprises a plurality of actual projection values; inquiring the thickness combination of the bone and the tissue corresponding to the actual projection data and the exposure condition from a storage unit, and determining a correction projection value corresponding to the thickness combination of the bone and the tissue corresponding to each actual projection value according to the thickness combination of the bone and the tissue and a bone unit projection value and a tissue unit projection value corresponding to the used exposure condition so as to update the actual projection data, wherein the bone unit projection value is a projection value corresponding to a bone through which the unienergy X-ray passes through unit thickness, and the tissue unit projection value is a projection value corresponding to a tissue through which the unienergy X-ray passes through unit thickness; and carrying out image reconstruction by using the updated actual projection data to obtain a target medical image.
8. The system of claim 7, further comprising:
the storage unit is used for storing mapping tables corresponding to different scanning part protocols under different exposure conditions.
9. A storage medium containing computer-executable instructions for performing the X-ray image reconstruction method according to any one of claims 1 to 6 when executed by a computer processor.
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| CN201911400160.4A CN111053566B (en) | 2019-12-30 | 2019-12-30 | X-ray image reconstruction method and device, X-ray imaging system and medium |
| EP20814241.4A EP3958742A4 (en) | 2019-05-24 | 2020-05-24 | Systems and methods for processing x-ray images |
| PCT/CN2020/091967 WO2020238817A1 (en) | 2019-05-24 | 2020-05-24 | Systems and methods for processing x-ray images |
| EP24191149.4A EP4428818A2 (en) | 2019-05-24 | 2020-05-24 | Systems and methods for processing x-ray images |
| US17/456,393 US20220092787A1 (en) | 2019-05-24 | 2021-11-24 | Systems and methods for processing x-ray images |
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