CN111062998A - Image reconstruction method, image reconstruction device, CT system and storage medium - Google Patents
Image reconstruction method, image reconstruction device, CT system and storage medium Download PDFInfo
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- 230000007547 defect Effects 0.000 description 2
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T11/00—2D [Two Dimensional] image generation
- G06T11/003—Reconstruction from projections, e.g. tomography
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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
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10072—Tomographic images
- G06T2207/10081—Computed x-ray tomography [CT]
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, which contains a target position, and a template image which is determined based on the maximum density projection and contains the target position; 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 performing image reconstruction of an interested region on the CT scanning data to be reconstructed by taking 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 interested region. The problem that the reconstruction center needs to be manually determined in the image reconstruction method in the prior art is solved.
Description
Technical Field
The embodiment of the invention relates to the field of image processing, in particular to an image reconstruction method and device, a CT system and a storage medium.
Background
In order to meet the requirement of clinical diagnosis, it is sometimes necessary to enlarge a region of interest of a CT (Computed Tomography, CT for short) image, that is, to reconstruct a target region of the CT image. However, the target region reconstruction of the CT image usually requires a determined reconstruction center, so that the user is required to determine the reconstruction center before the target region reconstruction. 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 reconstructs a target region of the image to be reconstructed based on the determined reconstruction center to obtain a reconstructed target region image, so that a doctor can perform clinical diagnosis according to the enlarged target region image.
In summary, the image reconstruction method in the prior art has the problem that the reconstruction center needs to be determined manually.
Disclosure of Invention
The embodiment of the invention provides an image reconstruction method, an image reconstruction device, a CT system and a storage medium, and aims to solve the problem that a 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, which contains a target position, and a template image which is determined based on the maximum density projection and contains the target position;
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 performing image reconstruction of an interested region on the CT scanning data to be reconstructed by taking 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 interested region.
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, which comprises a target position, and a template image which is determined based on the maximum density projection and comprises the target position;
a target position determining module, configured to determine, 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, position information of the target position in the maximum density projection image;
and the image reconstruction module is used for performing image reconstruction of an interested region on the CT scanning data to be reconstructed by taking 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 interested region.
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, which comprises a target position 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 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 performing image reconstruction of an interested region on the CT scanning data to be reconstructed by taking 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 interested region.
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 configured to perform the image reconstruction method according to 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, which contains a target position, and a template image which contains the target position and 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; and performing image reconstruction of the interested region on the CT scanning data to be reconstructed by taking the position information of the target position in the maximum density projection image as a reconstruction center 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 an operator is not relied on, and the reconstruction speed of the CT image of the region of interest can be greatly improved.
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. 1 is a flowchart of an image reconstruction method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a template image according to an embodiment of the present invention;
FIG. 3A is a coronal image corresponding to a template image provided in accordance with an embodiment of the present invention;
FIG. 3B is a perspective view of a shaft state image corresponding to a template image according to an embodiment of the present invention;
FIG. 3C is a sagittal image corresponding to the template image according to an embodiment of the present invention;
FIG. 4 is a schematic illustration of a maximum intensity projection image provided by one embodiment of the present invention;
FIG. 5 is a schematic diagram of the position of the target location in the maximum intensity projection image according to an embodiment of the present invention.
FIG. 6A is a schematic diagram of a position of a maximum intensity projection image before registration with a template image according to an embodiment of the present invention;
FIG. 6B is a schematic diagram of the maximum intensity projection image and the template image after being registered 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
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. 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 the reconstruction center is automatically determined and the image reconstruction is carried out on the interested region based on the reconstruction center. The method can be executed by the image reconstruction device provided by the embodiment of the invention, and the device can be realized in a software and/or hardware manner 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, which contains a target position, and a template image which contains the target position and is determined based on the maximum density projection.
The template image is a maximum density projection image carrying position information of the target position, which is shown in fig. 2. In order for the template image to carry the position information of the target position, it is generally required to mark the position information of the target position on the maximum density projection image containing the target position. The marking mode may be manual marking, or may also be automatic marking, such as identification of the right coronary heart, where the automatic marking method may be the existing technology, and this embodiment does not limit this. It should be noted that, unless specifically stated otherwise, the maximum density projection image in this embodiment is a maximum density projection image corresponding to CT scan data to be reconstructed.
In some embodiments, if the target location is in a tubular structure of interest, the target location is the axial centerline of the region of interest. Taking the region of interest as the right coronal area as an example, the target position is the right coronal axial centerline. As shown in FIGS. 3A, 3B and 3C, the right crown position in the axial position (z-direction, FIG. 3B) includesThe right corona in the coronal (x-direction, fig. 3A) image and the right corona in the sagittal (y-direction, fig. 3C) image are shown. Defining position information of a target position in a template image as coordinates PM(see FIG. 2).
Wherein the Maximum Intensity Projection (MIP) image is a two-dimensional image obtained by perspective, i.e. by calculating the Maximum Intensity pixel encountered along each ray of the scanned object. When the beam passes through an initial CT image of a section of tissue, the most dense pixels in the image are retained and projected onto a two-dimensional plane, thereby forming a MIP reconstructed image. The MIP can reflect the X-ray attenuation value of the corresponding pixel, small density change can be displayed on the MIP image, and stenosis, expansion and filling defects of the blood vessel can be well displayed, and calcification on the blood vessel wall and contrast agents in the blood vessel cavity can be well distinguished. It will be appreciated that the maximum density projection image is generated based on the initial CT image.
In this case, 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 breast image (see fig. 4), the template image must also be a template image of a breast (see fig. 2) to ensure the correspondence relationship therebetween.
Optionally, when the template image is selected, the region of interest corresponding to the maximum density projection image may be determined first, then the target location identifier is determined according to the region of interest, and then the template image is selected according to the target location identifier. Illustratively, if the region of interest of the maximum density projection image is a right crown and the target position of the right crown is identified as the "right crown", the template image is called from a template library in which the template image is stored according to the "right crown". The template image can be called by the system through automatic selection from a template library or manually through a configuration interface.
In order to enable both the template image and the maximum intensity projection image to present all the anatomical structures of the scanned object, the present embodiment preferably employs the initial CT image based on which the maximum display field is obtained from the template image and the maximum intensity projection image, so that both the template image and the maximum intensity projection image, and the corresponding initial CT images have complete contour information of the scanned object. The display field is an image range formed by data reconstruction, the display field of the embodiment is usually 500mm, and 700mm is the case where truncation may occur.
And 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.
And registering the template image and the maximum density projection image to obtain a coordinate conversion matrix between the template image and the maximum density projection image, and then determining the position information of the target position in the maximum density projection image according to the coordinate conversion matrix and the position information of the target position in the template image. Defining a target position as PTIts position in the maximum intensity projection image is as shown in fig. 5.
Fig. 6A is a diagram showing a positional relationship between the template image and the maximum intensity projection image when they are not aligned, and the contour radius of the maximum intensity projection image located at the front is smaller than the contour radius of the template image located at the rear, and the positions of the scanning beds of the two images do not coincide with each other. Fig. 6B is a diagram showing a positional relationship between the template image and the maximum intensity projection image after registration, in which the breast contours of both are superimposed in the front-rear direction of the scanning subject and the upper edge of the scanning bed of both are superimposed.
It should be noted that, the maximum density projection image and the template image may be registered by using a registration method in the prior art, and this embodiment does not specifically limit the maximum density projection image and the template image.
S103, performing image reconstruction of the interested region on the CT scanning data to be reconstructed by taking 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 interested region, and CT image reconstruction of interest is carried out on the CT scanning data to be reconstructed to obtain a target image. It will be appreciated that image reconstruction of a region of interest is typically used to enlarge the region of interest to reveal more detailed information about the region of interest, so that the display field of the target image is smaller than the display field of the initial CT image to which it corresponds. 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 obtain the overall information and 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, which contains a target position, and a template image which contains the target position and 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; and performing image reconstruction of the interested region on the CT scanning data to be reconstructed by taking the position information of the target position in the maximum density projection image as a reconstruction center 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 an operator is not relied on, and the reconstruction speed of the CT image 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 by any of the above embodiments, and the apparatus may be implemented by software or hardware. The device includes:
the acquisition module 11 is configured to acquire a maximum density projection image corresponding to CT scan data to be reconstructed, which includes a target position, and a template image, which is determined based on the maximum density projection and includes the target position;
a target position determining module 12, configured to determine, according to the registration relationship between the template image and the maximum density projection image and the position information of the target position in the template image, the position information of the target position in the maximum density projection image;
and the image reconstruction module 13 is configured to perform image reconstruction of the region of interest on the CT scan data to be reconstructed by taking 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 identification, wherein the template image is the template image containing the target position determined based on the maximum density projection image, and the target position is positioned in the interested region.
The target position determining module 12 is specifically configured to perform 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 conversion 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 the CT scanning data to be reconstructed and containing the target position and the template image containing the target position determined based on the maximum density projection are obtained through the obtaining module; 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 determination module; and performing image reconstruction 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 through an image reconstruction module 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 an operator is not relied on, and the reconstruction speed of the CT image 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 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, the CT system includes a scanning device 10 and a processor 11, the scanning device 10 is configured to obtain CT scan data to be reconstructed, which includes a target position of a scanned object; the processor 11 is configured to acquire a maximum density projection image corresponding to CT scan data to be reconstructed, which includes a target position, and a template image, which is determined based on the maximum density projection and includes the target position; 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 performing image reconstruction of a region of interest on the CT scanning data to be reconstructed by taking 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 template image is a maximum density projection image carrying position information of the target position, which is shown in fig. 2. In order for the template image to carry the position information of the target position, it is generally required to mark the position 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 position 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 specifically stated otherwise, the maximum density projection image in this embodiment is a maximum density projection image corresponding to CT scan data to be reconstructed.
Wherein the target position is an axial centerline of the region of interest in the maximum density projection image and the template image. Taking the region of interest as the right coronal area as an example, the target position is the right coronal axial centerline. As shown in fig. 3A, 3B, and 3C, the right crown position on the axis (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 position information of a target position in a template image as coordinates PM(see FIG. 2).
Wherein the Maximum Intensity Projection (MIP) image is a two-dimensional image obtained by perspective, i.e. by calculating the Maximum Intensity pixel encountered along each ray of the scanned object. When the beam passes through an initial CT image of a section of tissue, the most dense pixels in the image are retained and projected onto a two-dimensional plane, thereby forming a MIP reconstructed image. The MIP can reflect the X-ray attenuation value of the corresponding pixel, small density change can be displayed on the MIP image, and stenosis, expansion and filling defects of the blood vessel can be well displayed, and calcification on the blood vessel wall and contrast agents in the blood vessel cavity can be well distinguished. It will be appreciated that the maximum density projection image is generated based on the initial CT image.
In this case, 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 breast image (see fig. 4), the template image must also be a template image of a breast (see fig. 2) to ensure the correspondence relationship therebetween.
Optionally, when the template image is selected, the region of interest corresponding to the maximum density projection image may be determined first, then the target location identifier is determined according to the region of interest, and then the template image is selected according to the target location identifier. Illustratively, if the region of interest of the maximum density projection image is the right crown and the target location of the right crown is identified as the "right crown", the template image is recalled from the template library according to the "right crown". The template image can be called by the system through automatic selection from a template library or manually through a configuration interface.
In order to enable both the template image and the maximum intensity projection image to present all the anatomical structures of the scanned object, the present embodiment preferably employs the initial CT image based on which the maximum display field is obtained from the template image and the maximum intensity projection image, so that both the template image and the maximum intensity projection image, and the corresponding initial CT images have complete contour information of the scanned object. The display field is an image range formed by data reconstruction, the display field of the embodiment is usually 500mm, and 700mm is 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 then obtaining a target position on the template according to the coordinate transformation matrix and the target positionPosition information in the image, position information of the target position in the maximum density projection image is determined. Defining a target position as PTIts position in the maximum intensity projection image is as shown in fig. 5.
Fig. 6A is a diagram showing a positional relationship between the template image and the maximum intensity projection image when they are not aligned, and the contour radius of the maximum intensity projection image located at the front is smaller than the contour radius of the template image located at the rear, and the positions of the scanning beds of the two images do not coincide with each other. Fig. 6B is a diagram showing a positional relationship between the template image and the maximum intensity projection image after registration, in which the breast contours of both are superimposed in the front-rear direction of the scanning subject and the upper edge of the scanning bed of both are superimposed.
It should be noted that, the maximum density projection image and the template image may be registered by using a registration method in the prior art, and this embodiment does not specifically limit the maximum density projection image and the template 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 interested region, and CT image reconstruction of interest is carried out on the CT scanning data to be reconstructed to obtain a target image. It will be appreciated that image reconstruction of a region of interest is typically used to enlarge the region of interest to reveal more detailed information about the region of interest, so that the display field of the target image is smaller than the display field of the initial CT image to which it corresponds. 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 obtain the overall information and detail information of the scanned object in interest.
Further, as shown in fig. 8, the system further includes an output device 14, which is at least used for outputting a configuration interface, so that the processor acquires the template image and the CT scan data to be reconstructed based on the configuration interface, and outputs the target image through a display area of the configuration interface.
Illustratively, when the user uses the system, configuration information is input through a configuration interface output by the display device, the configuration information at least includes an image to be template, the configuration mode is generally suitable for defining a position of interest before acquiring CT scan data to be reconstructed of a scanned object, and at this time, the user selects a template identifier of a target position corresponding to the region of interest in a template image option of the configuration interface. After the processor acquires the to-be-reconstructed CT scanning data of a user through the scanning device, the image reconstruction method in the embodiment is triggered, a reconstruction center is determined according to the template image and the to-be-reconstructed CT scanning data, and the current to-be-reconstructed CT scanning data is subjected to region-of-interest CT image reconstruction based on the reconstruction center to obtain a target image.
It can be understood that, if CT image reconstruction of interest is to be performed on offline CT scan data to be reconstructed, it is generally required to configure the CT scan data to be reconstructed and the template image on 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 embodiment, and performs CT image reconstruction of the interest on current CT scan data to be reconstructed based on the reconstruction center to obtain a target image.
As shown in fig. 8, the system further includes a memory 12 and an input device 13; the number of the processors 11 in the device may be one or more, and one processor 11 is taken as an example in fig. 8; the processor 11, the memory 12, the input device 13 and the output device 14 in the apparatus may be connected by a bus or other means, and fig. 8 illustrates the connection by a bus as an example.
The memory 12, as a computer-readable storage medium, may be used for storing 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 embodiments of the present invention. The processor 11 executes various functional applications of the apparatus and data processing, i.e. implements the image reconstruction method described above, by running software programs, instructions and modules stored in the memory 12.
The memory 12 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; the storage data area may store data created according to the use of the terminal, and the like. Further, the 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 over 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 device 13 may be used to receive input numeric or character information and to generate key signal inputs relating to user settings and function controls of the apparatus.
The output device 14 may include a display device such as a display screen, for example, 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 reconstruction speed of the CT image of the region of interest can be greatly improved.
Example four
A fourth embodiment of the present invention further provides a storage medium containing computer-executable instructions, which when executed by a computer processor, perform an image reconstruction method, the method including:
acquiring a maximum density projection image corresponding to CT scanning data to be reconstructed, which contains a target position, and a template image which is determined based on the maximum density projection and contains the target position;
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 performing image reconstruction of an interested region on the CT scanning data to be reconstructed by taking 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 interested region.
Of course, the storage medium provided by the embodiment of the present invention contains computer-executable instructions, and the computer-executable instructions are not limited to the operations of the method described above, and may also perform related operations in the image reconstruction method provided by any embodiment 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 or portions thereof that contribute to the prior art may be embodied in the form of a software product, where the computer software product 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 to enable a computer device (which may be a personal computer, a server, or a network device) to execute the image reconstruction method according to the embodiments of the present invention.
It should be noted that, in the embodiment of the image reconstruction apparatus, the included units and modules are only divided according to functional logic, but are not limited to the above division as long as the corresponding functions can be implemented; 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 (10)
1. An image reconstruction method, comprising:
acquiring a maximum density projection image corresponding to CT scanning data to be reconstructed, which contains a target position, and a template image which is determined based on the maximum density projection and contains the target position;
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 performing image reconstruction of an interested region on the CT scanning data to be reconstructed by taking 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 interested region.
2. The method of claim 1, wherein the acquiring a maximum density projection image corresponding to the CT scan data to be reconstructed containing the target position and a template image containing the target position determined based on the maximum density projection comprises:
acquiring 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 in which the template images are stored according to the target position identification, wherein the template image is determined based on maximum density projection and contains the target position corresponding to the target position identification.
3. The method according to claim 1, wherein the determining the position information of the target position in the maximum density projection image according to the registration relationship between the template image and the maximum density projection image and the position information of the target position in the template image comprises:
carrying out 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 conversion 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 density projection image each have complete contour 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 shape of the region of interest is a tubular structure.
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, which comprises a target position, and a template image which is determined based on the maximum density projection and comprises the target position;
a target position determining module, configured to determine, 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, position information of the target position in the maximum density projection image;
and the image reconstruction module is used for performing image reconstruction of an interested region on the CT scanning data to be reconstructed by taking 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 interested region.
8. A CT system, comprising:
the scanning device is used for acquiring CT scanning data to be reconstructed, which comprises a target position 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 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 performing image reconstruction of an interested region on the CT scanning data to be reconstructed by taking 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 interested region.
9. The system of claim 8, further comprising an output device;
the output device is at least used for outputting a configuration interface, and the processor acquires 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 for performing the image reconstruction method of any one of claims 1-6 when executed by a computer processor.
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