CN111062998B - Image reconstruction method, device, CT system and storage medium - Google Patents
Image reconstruction method, device, CT system and storage medium Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000002591 computed tomography Methods 0.000 claims abstract description 52
- 239000011159 matrix material Substances 0.000 claims description 8
- 230000009466 transformation Effects 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 8
- 210000004204 blood vessel Anatomy 0.000 description 6
- 230000006870 function Effects 0.000 description 3
- 208000031481 Pathologic Constriction Diseases 0.000 description 2
- 210000003484 anatomy Anatomy 0.000 description 2
- 230000002308 calcification Effects 0.000 description 2
- 239000002872 contrast media Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000010339 dilation Effects 0.000 description 2
- 238000002594 fluoroscopy Methods 0.000 description 2
- 230000036262 stenosis Effects 0.000 description 2
- 208000037804 stenosis Diseases 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000747 cardiac effect Effects 0.000 description 1
- 238000003759 clinical diagnosis Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T11/00—2D [Two Dimensional] image generation
- G06T11/003—Reconstruction from projections, e.g. tomography
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/30—Determination of transform parameters for the alignment of images, i.e. image registration
- G06T7/33—Determination of transform parameters for the alignment of images, i.e. image registration using feature-based methods
- G06T7/337—Determination of transform parameters for the alignment of images, i.e. image registration using feature-based methods involving reference images or patches
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- G—PHYSICS
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- 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 embodiment of the invention discloses an image reconstruction method, an image reconstruction device, a CT system and a storage medium, wherein the method comprises the following steps: acquiring a maximum density projection image corresponding to CT scanning data to be reconstructed and containing a target position, and determining a template image containing the target position based on the maximum density projection; determining the position information of the target position in the maximum density projection image according to the registration relation between the template image and the maximum density projection image and the position information of the target position in the template image; and reconstructing an image of the region of interest on the CT scanning data to be reconstructed by using the position information of the target position in the maximum density projection image as a reconstruction center to obtain a target image, wherein the target position is positioned in the region of interest. The method solves the problem that the reconstruction center needs to be manually determined in the image reconstruction method in the prior art.
Description
Technical Field
The embodiment of the invention relates to the field of image processing, in particular to an image reconstruction method, an image reconstruction device, a CT system and a storage medium.
Background
In order to meet the clinical diagnostic needs, it is sometimes necessary to enlarge the region of interest of a CT (Computed Tomography, CT for short, computed tomography) image, i.e. to reconstruct the target region of the CT image. Whereas reconstruction of a target region of a CT image generally requires a defined reconstruction center, a user is required to determine the reconstruction center prior to reconstruction of the target region. In the prior art, a user generally selects a reconstruction range on a CT image to be reconstructed, then determines a reconstruction center according to the selected reconstruction range, and then performs target reconstruction on the image to be reconstructed based on the determined reconstruction center to obtain a reconstructed target image, so that a doctor can conveniently perform clinical diagnosis according to the amplified target image.
In summary, the image reconstruction method in the prior art has a problem that a reconstruction center needs to be manually determined.
Disclosure of Invention
The embodiment of the invention provides an image reconstruction method, an image reconstruction device, a CT system and a storage medium, which are used for solving the problem that the reconstruction center needs to be manually determined in the image reconstruction method in the prior art.
In a first aspect, an embodiment of the present invention provides an image reconstruction method, including:
acquiring a maximum density projection image corresponding to CT scanning data to be reconstructed and containing a target position, and determining a template image containing the target position based on the maximum density projection;
determining the position information of the target position in the maximum density projection image according to the registration relation between the template image and the maximum density projection image and the position information of the target position in the template image;
and reconstructing an image of the region of interest on the CT scanning data to be reconstructed by using the position information of the target position in the maximum density projection image as a reconstruction center to obtain a target image, wherein the target position is positioned in the region of interest.
In a second aspect, an embodiment of the present invention further provides an image reconstruction apparatus, including:
the acquisition module is used for acquiring a maximum density projection image corresponding to CT scanning data to be reconstructed and containing a target position, and determining a template image containing the target position based on the maximum density projection;
a target position determining module, configured to determine position information of the target position in the maximum density projection image according to a registration relationship between the template image and the maximum density projection image and position information of the target position in the template image;
and the image reconstruction module is used for reconstructing an image of the region of interest on the CT scanning data to be reconstructed by using the position information of the target position in the maximum density projection image as a reconstruction center so as to obtain a target image, wherein the target position is positioned in the region of interest.
In a third aspect, an embodiment of the present invention further provides a CT system, including:
the scanning device is used for acquiring CT scanning data to be reconstructed, wherein the CT scanning data comprise target positions of a scanning object;
the processor is used for acquiring a maximum density projection image corresponding to the CT scanning data to be reconstructed and a template image containing a target position and determined based on the maximum density projection; determining the position information of the target position in the maximum density projection image according to the registration relation between the template image and the maximum density projection image and the position information of the target position in the template image; and reconstructing an image of the region of interest on the CT scanning data to be reconstructed by using the position information of the target position in the maximum density projection image as a reconstruction center to obtain a target image, wherein the target position is positioned in the region of interest.
In a fourth aspect, embodiments of the present invention also provide a storage medium containing computer executable instructions which, when executed by a computer processor, are used to perform the image reconstruction method as described in the first aspect.
The technical scheme of the image reconstruction method provided by the embodiment of the invention comprises the following steps: acquiring a maximum density projection image corresponding to CT scanning data to be reconstructed containing a target position, and determining a template image containing the target position based on the maximum density projection; determining the position information of the target position in the maximum density projection image according to the registration relation between the template image and the maximum density projection image and the position information of the target position in the template image; and (3) reconstructing an image of the region of interest by using the position information of the target position in the maximum density projection image as a reconstruction center to reconstruct CT scanning data so as to obtain a target image. The reconstruction center of the region of interest is automatically determined through the template image and the position information of the target position in the template image, the experience of operators is not depended, and the CT image reconstruction speed of the region of interest can be greatly improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flowchart of an image reconstruction method according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a template image according to a first embodiment of the present invention;
FIG. 3A is a coronal image corresponding to a template image according to an embodiment of the present invention;
FIG. 3B is an axial position image corresponding to a template image according to an embodiment of the present invention;
FIG. 3C is a sagittal image corresponding to a template image provided in accordance with an embodiment of the present invention;
FIG. 4 is a schematic view of a maximum intensity projection image according to a first embodiment of the present invention;
fig. 5 is a schematic view of a position of a target position in a maximum intensity projection image according to an embodiment of the present invention.
FIG. 6A is a schematic view of a position of a maximum density projection image before registration with a template image according to an embodiment of the present invention;
FIG. 6B is a schematic view of a position of a maximum density projection image after registration with a template image according to an embodiment of the present invention;
fig. 7 is a block diagram of an image reconstruction apparatus according to a second embodiment of the present invention;
fig. 8 is a block diagram of a CT system according to a third embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described by means of implementation examples with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Fig. 1 is a flowchart of an image reconstruction method according to an embodiment of the present invention. The technical scheme of the embodiment is suitable for the situation that a reconstruction center is automatically determined and image reconstruction is carried out on the region of interest based on the reconstruction center. The method can be implemented by the image reconstruction device provided by the embodiment of the invention, and the device can be implemented in a software and/or hardware mode and is configured to be applied in a processor. As shown in fig. 1, the method specifically includes the following steps:
s101, acquiring a maximum density projection image corresponding to CT scanning data to be reconstructed containing a target position, and determining a template image containing the target position based on the maximum density projection.
The template image is a maximum density projection image carrying the position information of the target position, and is shown in fig. 2. In order for the template image to carry the positional information of the target position, it is generally necessary to mark the positional information of the target position on the maximum density projection image containing the target position. The marking mode may be manual marking or automatic marking, such as cardiac right-crown identification, where the automatic marking method may be performed by using the prior art, and the embodiment is not limited herein. It should be noted that, unless otherwise specifically noted, the maximum intensity projection image in the present embodiment is the maximum intensity projection image corresponding to the CT scan data to be reconstructed.
In some embodiments, if the region of interest in which the target location is located is a tubular structure, the target location is an axial centerline of the region of interest. Taking the region of interest as the right crown region as an example, the target position is the axial center line of the right crown. As shown in fig. 3A, 3B, and 3C, the right crown position on the axial (z-direction, fig. 3B) includes the right crown in the coronal (x-direction, fig. 3A) image and the right crown in the sagittal (y-direction, fig. 3C) image. Defining the position information of the target position in the template image as the coordinate P M (see FIG. 2).
Wherein the maximum intensity projection image (Maximum Intensity Projection, MIP) is generated by obtaining a two-dimensional image using fluoroscopy, i.e. by calculating the maximum intensity pixels encountered on each ray along the scanned object. As the beam passes through an initial CT image of a section of tissue, the most dense pixels in the image are preserved and projected onto a two-dimensional plane, thereby forming a MIP reconstructed image. MIP can reflect X-ray attenuation values of corresponding pixels, small density changes can be displayed on MIP images, and stenosis, dilation and filling defects of blood vessels can be well displayed, and calcification on blood vessel walls and contrast agents in blood vessel cavities can be distinguished. It is understood that the maximum intensity projection image is generated based on the initial CT image.
The maximum intensity projection image and the template image generally correspond to the same portion of the scanned object, for example, if the maximum intensity projection image is a chest image (see fig. 4), the template image must also be a chest template image (see fig. 2) to ensure the correspondence between the two images.
Alternatively, when selecting the template image, the region of interest corresponding to the maximum intensity projection image may be determined first, then the target location identifier may be determined according to the region of interest, and then the template image may be selected according to the target location identifier. For example, if the region of interest of the maximum intensity projection image is a right crown and the target location of the right crown is identified as "right crown", the template image is called from the template library in which the template image is stored according to the "right crown". The template image can be automatically selected from the template library by the system, or manually selected from the template library by a person through a configuration interface.
In order to enable the template image and the maximum density projection image to present all anatomical structures of the scanned object, the embodiment preferably adopts an initial CT image based on which the template image and the maximum density projection image are acquired by using the maximum display field, so that the template image and the maximum density projection, and the initial CT images corresponding to the template image and the maximum density projection image have complete contour information of the scanned object. The display field in this embodiment is typically 500mm for the image range formed by reconstructing data, and 700mm for the case where truncation may occur.
S102, determining the position information of the target position in the maximum density projection image according to the registration relation between the template image and the maximum density projection image and the position information of the target position in the template image.
Registering the template image and the maximum density projection image to obtain a coordinate transformation matrix between the template image and the maximum density projection image, and determining the position information of the target position in the maximum density projection image according to the coordinate transformation matrix and the position information of the target position in the template image. Defining the target position as P T Its position in the maximum density projection image is shown in fig. 5.
Fig. 6A shows a positional relationship diagram of the template image and the maximum density projection image when they are not aligned, wherein the contour radius of the maximum density projection image positioned in front is smaller than that of the template image positioned in rear, and the positions of the scanning beds of the two images are not overlapped. Fig. 6B shows a positional relationship diagram between the template image and the maximum density projection image after registration, the chest contours of the two are overlapped in the front-rear direction of the scan object, and the upper edges of the scan beds of the two are overlapped.
It should be noted that, the registration method in the prior art is only used to register the maximum density projection image and the template image, and the embodiment is not limited specifically.
S103, reconstructing an image of the region of interest of CT scanning data to be reconstructed by using the position information of the target position in the maximum density projection image as a reconstruction center to obtain a target image.
After the position information of the target position in the maximum density projection image is determined, the position information is used as a reconstruction center of the region of interest, and CT image reconstruction of interest is carried out on CT scanning data to be reconstructed to obtain the target image. It will be appreciated that image reconstruction of a region of interest is typically used to magnify the region of interest to reveal more detailed information of the region of interest, so that the display field of the target image is smaller than the display field of its corresponding initial CT image. Optionally, the present embodiment places the target image on one side of the display field of the initial CT image, so as to facilitate the user to acquire the whole information and the detail information of the scanned object in interest.
The technical scheme of the image reconstruction method provided by the embodiment of the invention comprises the following steps: acquiring a maximum density projection image corresponding to CT scanning data to be reconstructed containing a target position, and determining a template image containing the target position based on the maximum density projection; determining the position information of the target position in the maximum density projection image according to the registration relation between the template image and the maximum density projection image and the position information of the target position in the template image; and (3) reconstructing an image of the region of interest by using the position information of the target position in the maximum density projection image as a reconstruction center to reconstruct CT scanning data so as to obtain a target image. The reconstruction center of the region of interest is automatically determined through the template image and the position information of the target position in the template image, the experience of operators is not depended, and the CT image reconstruction speed of the region of interest can be greatly improved.
Example two
Fig. 7 is a block diagram of an image reconstruction apparatus according to a second embodiment of the present invention. The apparatus is used for executing the image reconstruction method provided in any of the above embodiments, and the apparatus may be implemented in software or hardware. The device comprises:
an acquiring module 11, configured to acquire a maximum density projection image corresponding to CT scan data to be reconstructed including a target position, and a template image including the target position determined based on the maximum density projection;
a target position determining module 12, configured to determine position information of the target position in the maximum density projection image according to a registration relationship between the template image and the maximum density projection image and position information of the target position in the template image;
the image reconstruction module 13 is configured to reconstruct an image of the region of interest from CT scan data to be reconstructed by using the position information of the target position in the maximum density projection image as a reconstruction center to obtain a target image.
The acquisition module 11 is specifically configured to acquire a maximum density projection image and a target position identifier corresponding to CT scan data to be reconstructed; and determining a template image according to the target position mark, wherein the template image is determined based on the maximum density projection image and comprises the target position, and the target position is positioned in the region of interest.
The target position determining module 12 is specifically configured to perform image registration on the template image and the maximum density projection image, so as to obtain a coordinate transformation matrix between the template image and the maximum density projection image; and determining the position information of the target position in the maximum density projection image according to the coordinate transformation matrix and the position information of the target position in the template image.
According to the technical scheme of the image reconstruction device, the maximum density projection image corresponding to CT scanning data to be reconstructed containing a target position is obtained through the obtaining module, and the template image containing the target position is determined based on the maximum density projection; determining the position information of the target position in the maximum density projection image according to the registration relation between the template image and the maximum density projection image and the position information of the target position in the template image by a target position determining module; and (3) reconstructing an image of the region of interest by using the CT scanning data to be reconstructed by using the image reconstruction module to obtain a target image by using the position information of the target position in the maximum density projection image as a reconstruction center. The reconstruction center of the region of interest is automatically determined through the template image and the position information of the target position in the template image, the experience of operators is not depended, and the CT image reconstruction speed of the region of interest can be greatly improved.
The image reconstruction device provided by the embodiment of the invention can execute the image reconstruction method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
Example III
An embodiment of the present invention provides a CT system, as shown in fig. 8, which includes a scanning device 10 and a processor 11, where the scanning device 10 is configured to acquire CT scan data to be reconstructed including a target position of a scan object; the processor 11 is configured to acquire a maximum density projection image corresponding to CT scan data to be reconstructed including a target position, and a template image including the target position determined based on the maximum density projection; determining the position information of the target position in the maximum density projection image according to the registration relation between the template image and the maximum density projection image and the position information of the target position in the template image; and reconstructing an image of the region of interest of CT scanning data to be reconstructed by using position information of the target position in the maximum density projection image as a reconstruction center to obtain a target image, wherein the target position is positioned in the region of interest.
The template image is a maximum density projection image carrying the position information of the target position, and is shown in fig. 2. In order for the template image to carry the positional information of the target position, it is generally necessary to mark the positional information of the target position on the maximum density projection image containing the target position. The marking mode can adopt manual marking or automatic marking, and the position information of the marked target positions in the template image is determined by statistical data based on the position information of a large number of target positions. It should be noted that, unless otherwise specifically noted, the maximum intensity projection image in the present embodiment is the maximum intensity projection image corresponding to the CT scan data to be reconstructed.
Wherein the target position is the axial center line of the region of interest in the maximum density projection image and the template image. Taking the region of interest as the right crown region as an example, the target position is the axial center line of the right crown. As shown in fig. 3A, 3B, and 3C, the right crown position on the axial (z-direction, fig. 3B) includes the right crown in the coronal (x-direction, fig. 3C) image and the right crown in the sagittal (y-direction, fig. 3A) image. Defining the position information of the target position in the template image as the coordinate P M (see FIG. 2).
Wherein the maximum intensity projection image (Maximum Intensity Projection, MIP) is generated by obtaining a two-dimensional image using fluoroscopy, i.e. by calculating the maximum intensity pixels encountered on each ray along the scanned object. As the beam passes through an initial CT image of a section of tissue, the most dense pixels in the image are preserved and projected onto a two-dimensional plane, thereby forming a MIP reconstructed image. MIP can reflect X-ray attenuation values of corresponding pixels, small density changes can be displayed on MIP images, and stenosis, dilation and filling defects of blood vessels can be well displayed, and calcification on blood vessel walls and contrast agents in blood vessel cavities can be distinguished. It is understood that the maximum intensity projection image is generated based on the initial CT image.
The maximum intensity projection image and the template image generally correspond to the same portion of the scanned object, for example, if the maximum intensity projection image is a chest image (see fig. 4), the template image must also be a chest template image (see fig. 2) to ensure the correspondence between the two images.
Alternatively, when selecting the template image, the region of interest corresponding to the maximum intensity projection image may be determined first, then the target location identifier may be determined according to the region of interest, and then the template image may be selected according to the target location identifier. For example, if the region of interest of the maximum intensity projection image is a right crown and the target location of the right crown is identified as "right crown", the template image is called from the template library according to "right crown". The template image can be automatically selected from the template library by the system, or manually selected from the template library by a person through a configuration interface.
In order to enable the template image and the maximum density projection image to present all anatomical structures of the scanned object, the embodiment preferably adopts an initial CT image based on which the template image and the maximum density projection image are acquired by using the maximum display field, so that the template image and the maximum density projection, and the initial CT images corresponding to the template image and the maximum density projection image have complete contour information of the scanned object. The display field in this embodiment is typically 500mm for the image range formed by reconstructing data, and 700mm for the case where truncation may occur.
Registering the template image and the maximum density projection image to obtain a coordinate transformation matrix between the template image and the maximum density projection image, and determining the position information of the target position in the maximum density projection image according to the coordinate transformation matrix and the position information of the target position in the template image. Defining the target position as P T Its position in the maximum density projection image is shown in fig. 5.
Fig. 6A shows a positional relationship diagram of the template image and the maximum density projection image when they are not aligned, wherein the contour radius of the maximum density projection image positioned in front is smaller than that of the template image positioned in rear, and the positions of the scanning beds of the two images are not overlapped. Fig. 6B shows a positional relationship diagram between the template image and the maximum density projection image after registration, the chest contours of the two are overlapped in the front-rear direction of the scan object, and the upper edges of the scan beds of the two are overlapped.
It should be noted that, the registration method in the prior art is only used to register the maximum density projection image and the template image, and the embodiment is not limited specifically.
After the position information of the target position in the maximum density projection image is determined, the position information is used as a reconstruction center of the region of interest, and CT image reconstruction of interest is carried out on CT scanning data to be reconstructed to obtain the target image. It will be appreciated that image reconstruction of a region of interest is typically used to magnify the region of interest to reveal more detailed information of the region of interest, so that the display field of the target image is smaller than the display field of its corresponding initial CT image. Optionally, the present embodiment places the target image on one side of the display field of the initial CT image, so as to facilitate the user to acquire the whole information and the detail information of the scanned object in interest.
Further, as shown in fig. 8, the system further comprises an output device 14, at least for outputting the configuration interface, so that the processor obtains the template image and the CT scan data to be reconstructed based on the configuration interface, and outputs the target image through the display area of the configuration interface.
When the system is used, a user inputs configuration information through a configuration interface output by a display device, the configuration information at least comprises an image to be templated, the configuration mode is generally suitable for defining the interested position before acquiring CT scanning data to be rebuilt of a scanning object, and at the moment, the user selects a template identifier of a target position corresponding to the interested region in template image options of the configuration interface. After acquiring CT scan data to be reconstructed of a user through a scanning device, the processor triggers the image reconstruction method described in the foregoing embodiment, determines a reconstruction center according to a template image and the CT scan data to be reconstructed, and performs CT image reconstruction of a region of interest on the current CT scan data to be reconstructed based on the reconstruction center to obtain a target image.
It will be appreciated that if the CT image reconstruction of interest is to be performed on offline CT scan data to be reconstructed, it is generally necessary to configure the CT scan data to be reconstructed and the template image at a configuration interface, so that the processor determines a reconstruction center of interest according to the CT scan data to be reconstructed and the template image according to the image reconstruction method described in the foregoing embodiments, and performs the CT image reconstruction of the region of interest on the current CT scan data to be reconstructed based on the reconstruction center to obtain the target image.
As shown in fig. 8, the system further comprises a memory 12 and an input device 13; the number of processors 11 in the device may be one or more, one processor 11 being taken as an example in fig. 8; the processor 11, the memory 12, the input means 13 and the output means 14 in the device may be connected by a bus or other means, in fig. 8 by way of example.
The memory 12 is a computer readable storage medium, and may be used to store software programs, computer executable programs, and modules, such as program instructions/modules (e.g., the acquisition module 11, the target position determination module 12, and the image reconstruction module 13) corresponding to the image reconstruction method in the embodiment of the present invention. The processor 11 executes various functional applications of the apparatus and data processing, i.e., implements the above-described image reconstruction method, by running software programs, instructions and modules stored in the memory 12.
The memory 12 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for functions; the storage data area may store data created according to the use of the terminal, etc. In addition, memory 12 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, memory 12 may further include memory located remotely from processor 11, which may be connected to the device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input means 13 may be used to receive entered numeric or character information and to generate key signal inputs related to user settings and function control of the device.
The output means 14 may comprise a display device such as a display screen, for example a display screen of a user terminal.
Compared with the prior art, the method and the device have the advantages that the reconstruction center of the region of interest is automatically determined through the template image and the position information of the target position in the template image, the experience of operators is not relied on, and the CT image reconstruction speed of the region of interest can be greatly improved.
Example IV
A fourth embodiment of the present invention also provides a storage medium containing computer-executable instructions for performing an image reconstruction when executed by a computer processor, the method comprising:
acquiring a maximum density projection image corresponding to CT scanning data to be reconstructed and containing a target position, and determining a template image containing the target position based on the maximum density projection;
determining the position information of the target position in the maximum density projection image according to the registration relation between the template image and the maximum density projection image and the position information of the target position in the template image;
and reconstructing an image of the region of interest on the CT scanning data to be reconstructed by using the position information of the target position in the maximum density projection image as a reconstruction center to obtain a target image, wherein the target position is positioned in the region of interest.
Of course, the storage medium containing the computer executable instructions provided in the embodiments of the present invention is not limited to the method operations described above, and may also perform the related operations in the image reconstruction method provided in any embodiment of the present invention.
From the above description of embodiments, it will be clear to a person skilled in the art that the present invention may be implemented by means of software and necessary general purpose hardware, but of course also by means of hardware, although in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art 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 (Random Access Memory, RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, etc., and include several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the image reconstruction method according to the embodiments of the present invention.
It should be noted that, in the above embodiment of the image reconstruction apparatus, each unit and module included are only divided according to the functional logic, but not limited to the above division, so long as the corresponding functions can be implemented; in addition, the specific names of the functional units are also only for distinguishing from each other, and are not used to limit the protection scope of the present invention.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. 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, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (10)
1. An image reconstruction method, comprising:
acquiring a maximum density projection image corresponding to CT scanning data to be reconstructed and containing a target position, and determining a template image containing the target position based on the maximum density projection;
determining the position information of the target position in the maximum density projection image according to the registration relation between the template image and the maximum density projection image and the position information of the target position in the template image;
and reconstructing an image of the region of interest on the CT scanning data to be reconstructed by using the position information of the target position in the maximum density projection image as a reconstruction center to obtain a target image, wherein the target position is positioned in the region of interest.
2. The method according to claim 1, wherein the acquiring a maximum intensity projection image corresponding to CT scan data to be reconstructed including a target location, and the determining a template image including the target location based on the maximum intensity projection, comprises:
obtaining a maximum density projection image and a target position mark corresponding to CT scanning data to be reconstructed;
and selecting a corresponding template image from a template library stored with the template images according to the target position identification, wherein the template image is determined based on maximum density projection and comprises the target position corresponding to the target position identification.
3. The method of claim 1, wherein the determining the location information of the target location in the maximum intensity projection image based on the registration relationship between the template image and the maximum intensity projection image and the location information of the target location in the template image comprises:
performing image registration on the template image and the maximum density projection image to obtain a coordinate transformation matrix between the template image and the maximum density projection image;
and determining the position information of the target position in the maximum density projection image according to the coordinate transformation matrix and the position information of the target position in the template image.
4. The method of claim 1, wherein the template image and the maximum intensity projection image each have complete profile information of the scanned object.
5. The method of claim 4, wherein the display field corresponding to the target image is less than or equal to the display field corresponding to the maximum intensity projection image.
6. The method of claim 5, wherein the target location is located at an axial centerline of the region of interest if the region of interest is tubular in shape.
7. An image reconstruction apparatus, comprising:
the acquisition module is used for acquiring a maximum density projection image corresponding to CT scanning data to be reconstructed and containing a target position, and determining a template image containing the target position based on the maximum density projection;
a target position determining module, configured to determine position information of the target position in the maximum density projection image according to a registration relationship between the template image and the maximum density projection image and position information of the target position in the template image;
and the image reconstruction module is used for reconstructing an image of the region of interest on the CT scanning data to be reconstructed by using the position information of the target position in the maximum density projection image as a reconstruction center so as to obtain a target image, wherein the target position is positioned in the region of interest.
8. A CT system, comprising:
the scanning device is used for acquiring CT scanning data to be reconstructed, wherein the CT scanning data comprise target positions of a scanning object;
the processor is used for acquiring a maximum density projection image corresponding to the CT scanning data to be reconstructed and a template image containing a target position and determined based on the maximum density projection; determining the position information of the target position in the maximum density projection image according to the registration relation between the template image and the maximum density projection image and the position information of the target position in the template image; and reconstructing an image of the region of interest on the CT scanning data to be reconstructed by using the position information of the target position in the maximum density projection image as a reconstruction center to obtain a target image, wherein the target position is positioned in the region of interest.
9. The system of claim 8, further comprising an output device;
the output device is at least used for outputting a configuration interface, the processor obtains a template image and the CT scanning data to be reconstructed based on the configuration interface, and outputs the target image through a display area of the configuration interface.
10. A storage medium containing computer executable instructions which, when executed by a computer processor, are for performing the image reconstruction method as claimed in any one of claims 1 to 6.
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