CN106842084B - A kind of MR imaging method and device - Google Patents
A kind of MR imaging method and device Download PDFInfo
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- CN106842084B CN106842084B CN201611258530.1A CN201611258530A CN106842084B CN 106842084 B CN106842084 B CN 106842084B CN 201611258530 A CN201611258530 A CN 201611258530A CN 106842084 B CN106842084 B CN 106842084B
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Abstract
The embodiment of the invention provides a kind of MR imaging method and devices, this method comprises: according to the desired space K and default rotation angle, determine the space at least one target K, wherein the data area in the space the target K covers the main-data area in the expectation space K；Scan data is filled to the space the target K；Image reconstruction is carried out according to the data in the space target K described at least one, obtains target image.The embodiment of the present invention is by using above-mentioned technical proposal, target image is rebuild using the space target K rotated relative to the desired space K, the region of beating artifact contamination can be made to be shifted, to effectively avoid the image information of beating artifact contamination key area, improve the imaging effect of reconstruction image.
Description
Technical field
The present embodiments relate to technical field of image processing more particularly to a kind of MR imaging methods and device.
Background technique
Mr imaging technique (Magnetic Resonance Imaging, MRI) is to utilize electromagnetic induction phenomenon from human body
Middle acquisition electromagnetic signal, and human body information is reconstructed to reach a kind of imaging technique of diagnostic purpose.Current magnetic resonance imaging
Technology (Magnetic Resonance Imaging, MRI) is mainly the imaging of hydrogen atom, by applying alternating magnetic field, makes hydrogen
Atomic nucleus occur covibration, hydrogen nuclei absorb alternating field energy, the outside radiation energy in relaxation process, here it is with
In the signal of magnetic resonance imaging, current signal will be then induced in receiving coil, the electric current that receiving coil is induced
Signal is after computer disposal, so that it may obtain the cross-section image of human body.Typical MR imaging method in the prior art
As follows: the current signal that receiving coil induces obtains digital signal after Analog-digital Converter, by digital signal according to certain
Coding direction be filled into the space K, wherein the space K is a kind of data filling space of original magnetic resonance signal, and user can be
Desired reconstruction image orientation is set on magnetic resonance device, such as it is sagittal plane, cross that desired reconstruction image orientation, which can be set,
Section or coronal-plane or any angle fill data collected according to coding direction according to desired reconstruction image orientation
To the space K, the data in the space K can reconstruct a certain cross-section image of human body after image reconstruction algorithm is handled.
Artifact refer to script scanned object and be not present and the image of various forms that occurs on the image, it is total in magnetic
In vibration imaging, the beating of blood vessel or cerebrospinal fluid is the main source of artifact.Traditional mr imaging technique can be generally number
Frequency coding direction (Frequency Encoding Direction, also referred to as readout direction (Readout are selected according to acquisition
Direction, abbreviation RO)) and phase-encoding direction (Phase Encoding Direction, abbreviation PE), since phase is compiled
The time of code direction data acquisition is much higher than the time of frequency coding bearing data acquisition, therefore is beaten by organ and caused
Data difference easily occur on the direction of phase code so that reconstruction image is fuzzy or artifact overlap it is interested
On key position.Usually phase-encoding direction is provided parallel to or perpendicular to following three direction: head foot direction (head-
Feet), front-rear direction (anterior-posterior) and left and right directions (left-right), to limit the dirt of beating artifact
Contaminate region.
But inventor, in carrying out research process of the invention, the discovery prior art has following defects that in certain feelings
Under condition, the set phase-encoding direction artifact that can make to beat is added to the pass of clinical diagnosis just in traditional magnetic resonance imaging
Key position, imaging effect are poor.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of MR imaging method and device, with solve existing magnetic resonance at
As the technological deficiency that technology imaging effect is poor.
In a first aspect, the embodiment of the invention provides a kind of MR imaging methods, comprising:
According to the desired space K and default rotation angle, the space at least one target K is determined, wherein the space the target K
Data area cover it is described expectation the space K main-data area；
Scan data is filled to the space the target K；
Image reconstruction is carried out according to the data in the space target K described at least one, obtains target image.
Second aspect, the embodiment of the invention also provides a kind of MR imaging apparatus, comprising:
The space K determining module, for determining the space at least one target K according to the desired space K and default rotation angle,
Wherein, the data area in the space the target K covers the main-data area in the expectation space K；
Module is filled, for filling scan data to the space the target K；
Module is rebuild, for carrying out image reconstruction according to the data in the space target K described at least one, obtains target figure
Picture.
Technical solution provided in an embodiment of the present invention determines at least one according to the desired space K and preset rotation angle
The space a target K, and the data area in the space target K include it is expected the space K main-data area, backward determine target
The data that scanning collection arrives are filled in the space K, are carried out image reconstruction according to the data in the space target K, are obtained desired target
Image, the embodiment of the present invention utilize the target K rotated relative to the desired space K by using above-mentioned technical proposal
Space rebuilds target image, and the region for the artifact contamination that can make to beat is shifted, to effectively avoid beating artifact contamination
The image information of key area improves the imaging effect of reconstruction image.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, institute in being described below to the embodiment of the present invention
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also implement according to the present invention
The content of example and these attached drawings obtain other attached drawings.
Fig. 1 a is a kind of flow diagram for MR imaging method that the embodiment of the present invention one provides；
Fig. 1 b is the magnetic resonance imaging Contrast on effect schematic diagram that the embodiment of the present invention one provides；
Fig. 2 a is a kind of flow diagram of MR imaging method provided by Embodiment 2 of the present invention；
Fig. 2 b is the space target K provided by Embodiment 2 of the present invention schematic diagram；
Fig. 3 is a kind of flow diagram for MR imaging method that the embodiment of the present invention three provides；
Fig. 4 is a kind of flow diagram for MR imaging method that the embodiment of the present invention four provides；
Fig. 5 is a kind of structural schematic diagram for MR imaging apparatus that the embodiment of the present invention five provides.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limiting the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
It should be mentioned that some exemplary embodiments are described as before exemplary embodiment is discussed in greater detail
The processing or method described as flow chart.Although each step is described as the processing of sequence by flow chart, many of these
Step can be implemented concurrently, concomitantly or simultaneously.In addition, the sequence of each step can be rearranged.When its operation
The processing can be terminated when completion, it is also possible to have the additional step being not included in attached drawing.The processing can be with
Corresponding to method, function, regulation, subroutine, subprogram etc..
Embodiment one
Fig. 1 a is a kind of flow diagram for MR imaging method that the embodiment of the present invention one provides, and this method is suitable for
The case where MR image reconstruction, this method can be executed by MR imaging apparatus, and wherein the device can be by software and/or hard
Part is realized.As shown in Figure 1a, this method comprises:
Step 101 rotates angle with default according to the desired space K, determines the space at least one target K.
Wherein, the data area in the space the target K covers the main-data area in the expectation space K.
Typically, the space K is the filling space of magnetic resonance signal, and each width reconstruction image has corresponding K space data.
Illustratively, it is expected that the space K refers to the corresponding space K of the desired reconstruction image of user, user can be in MRI
The orientation of desired reconstruction image, the visual field (Field of View, abbreviation FOV) size and image is arranged in imaging device interface
The parameters such as spatial resolution, wherein FOV size is the size of desired reconstruction image, when scanning each time, accordingly
FOV information be it is determining, according to the corresponding relationship of the parameter of above-mentioned setting and K spatial parameter, can determine the volume in the desired space K
The data area range in the space K and the interval of neighbouring sample point it is expected in code direction.Default rotation angle is based on the desired space K
Coding direction setting rotation angle, can be what user was manually entered, be also possible to based on experience value in MRI imaging system
In pre-enter, it would be desirable to the space K is rotated according to default rotation angle, can obtain at least one relative to desired K
The target K space of Space Rotating.Main-data area refers to that the main data area including imageable target, such as imageable target are
Spinal cord, then main-data area should include at least all scan datas for rebuilding spinal cord.
Scan data is filled in step 102, the space target K Xiang Suoshu.
Illustratively, scan data is filled into the space target K according to the coding direction in the space target K.The coding in the space K
After direction rotates, compared with the sequence of desired K space sampling data, the sampling order in the space target K can change, from
And the position of artifact when reconstruction image is shifted.
Step 103 carries out image reconstruction according to the data in the space target K described at least one, obtains target image.
Illustratively, image reconstruction is carried out according to image reconstruction algorithm to the data filled in the space at least one target K,
Such as inverse fourier transform (2DFT) is carried out to the scan data filled in the space target K and is calculated, obtain target image.
Technical solution provided in this embodiment determines at least one mesh according to the desired space K and preset rotation angle
Mark the space K, and it is expected the data area in the space target K includes the main-data area in the space K, target K sky determining backward
Between the middle data that arrive of filling scanning collection, carry out image reconstruction according to the data in the space target K, obtain desired target figure
Picture can make beating pseudo- by rebuilding target image using the space target K rotated relative to the desired space K
The region of shadow pollution is shifted, to effectively avoid the image information of beating artifact contamination key area, improves reconstruction image
Imaging effect.
Further, Fig. 1 b is the magnetic resonance imaging Contrast on effect schematic diagram that the embodiment of the present invention one provides, the A in Fig. 1 b
Figure is the spinal cord image obtained using the prior art according to the data reconstruction in the desired space K, and the B figure in Fig. 1 b is using one
The spinal cord reconstruction image that data in the space target K obtain, the coding direction in the space target K is relative to desired K Space Rotating
30 degree or so, it is seen that obtain the presence of a large amount of white artifacts in image at the spinal cord position of arrow meaning using the prior art, and adopt
In the reconstruction image rebuild with technical solution provided in an embodiment of the present invention, the artifact at spinal cord position greatly reduces, and improves
The imaging effect of image.
Embodiment two
Fig. 2 a is a kind of flow diagram of MR imaging method provided by Embodiment 2 of the present invention, and the present embodiment is upper
On the basis of stating embodiment one, the determining space at least one target K is optimized.As shown in Figure 2 a, this method comprises:
Step 201, determine in the space expectation K with the associated main-data area of imageable target.
Optionally, the data field of target image to be reconstructed in the expectation space K is determined according to the imageable target
Domain, as the main-data area.
Illustratively, imageable target refers to that user it is expected to obtain the position of MR image, for example, imageable target can for spinal cord,
The positions such as cardiovascular injuries or pelvic cavity, main-data area refer to the key data area that reestablishment imaging target is used in the desired space K
Domain, imaging position is different, then main-data area is also different, and the corresponding main data area of imageable target can be determined according to clinical experience
Domain, or sample statistics are carried out to different imageable targets, obtain corresponding main-data area.
Step 202, according to the expectation space K coding direction according to rotating at least one clockwise or counterclockwise
The default rotation angle, to determine the coding direction at least one space the target K.
Illustratively, it would be desirable to which the direction RO and PE in the space K is rotated according to default rotation angle, and direction of rotation can be with
For the direction RO and PE for clockwise or counterclockwise, obtaining the space at least one target K.
Illustratively, Fig. 2 b is the space target K provided by Embodiment 2 of the present invention schematic diagram, as shown in Figure 2 b, in figure
Dotted line shown in the dashed rectangle expression expectation space K, RO and PE respectively indicates readout direction and the phase code side in the desired space K
Indicate a space target K to, solid-line rectangle, it is expected θ indicates rotation angle of the space target K relative to the space K, 1RO with
Solid line shown in 1PE respectively indicates the corresponding readout direction in the space target K and phase-encoding direction.
Step 203, according to the boundary position of the main-data area and the coding direction in the space the target K, determine
The space the target K.
Illustratively, the boundary in the space target K is determined according to the boundary position information of the main-data area in the desired space K
Location information, as shown in Figure 2 b, the space target K can include the data area in the desired space K, but usual main-data area completely
Accelerate data processing speed for the central data area for it is expected space K to reduce data volume, the space target K covers main data area
Domain can reconstruct imageable target, such as the space target K can not include the data boundary region for it is expected space K, keep target K empty
Between covering expectation the space K 90% data area.
Scan data is filled in step 204, the space target K Xiang Suoshu.
Illustratively, the space target K is the K obtained after the default rotation angle of coding direction rotation in the desired space K
Space, it is corresponding to the filling of the space target K after the coding direction and the data area that should include for determining the space target K
Scan data.
Step 205 carries out image reconstruction according to the data in the space target K described at least one, obtains target image.
Technical solution provided in this embodiment determines at least according to the coding direction in the desired space K and default rotation angle
The coding direction in one space target K, by being used for the main-data area of reestablishment imaging target in the expectation space K, according to main number
The data area of covering needed for determining the space at least one target K according to the boundary position information in region determines the space target K
Boundary so that scan data is filled into the space target K, and rebuilds target image.By being carried out using relative to the desired space K
The obtained space target K is rotated to rebuild target image, so that the region of beating artifact contamination is shifted, to effectively keep away
The image information for exempting from beating artifact contamination key area, improves the imaging effect of reconstruction image, since the space target K contains the phase
The main-data area for hoping the space K enables the target image rebuild to have preferable contrast.
Optionally, the absolute value of the default rotation angle is less than 45 degree.
Illustratively, fixed by the rotation angle block gauge rotated counterclockwise if the rotation angle block gauge rotated clockwise is set to just
It is negative, such as default rotation angle can be -10 degree, -20 degree, 10 degree or 20 degree etc., determine the space at least one target K
When, the absolute value of corresponding rotation angle, by the rotation angle in the space limited target K, can be effectively improved less than 45 degree
The reconstruction image as caused by main field is uneven or chemical shift deforms ambiguity.
Further, if imageable target is different, the corresponding default rotation in the space target K that optimum image rebuilds effect is obtained
Gyration may also be different, can be by carrying out sample to different imageable targets when choosing the angle value of default rotation angle
Statistics, such as determines the space target K to each imageable target with different rotation angles, and carry out image reconstruction, can will obtain
Rotation angle is preferably preset when the corresponding rotation angle in the space target K is determined as rebuilding the imageable target when imaging effect is optimal
Degree.
Embodiment three
Fig. 3 is a kind of flow diagram for MR imaging method that the embodiment of the present invention three provides, and the present embodiment is upper
On the basis of stating each embodiment, " according in the space target K described at least one data carry out image reconstruction, obtain target
Image " optimizes, as shown in figure 3, this method comprises:
Step 301 rotates angle with default according to the desired space K, determines the space at least one target K.
Wherein, the data area in the space the target K covers the main-data area in the expectation space K.
Scan data is filled in step 302, the space target K Xiang Suoshu.
Step 303 carries out image reconstruction according to the data in the space target K described at least one, to determine an at least width
Rotate image.
Illustratively, to the data in the space at least one target K, image reconstruction is carried out according to image reconstruction algorithm, is obtained
Image is rotated to an at least width, the rotation image refers to that the image relative to the desired space K rotates, such as expectation K empty
Between imageable target be spinal cord, the reconstruction image orientation of user setting is sagittal plane, i.e. spinal cord is presented on the display apparatus vertically,
If the space target K rotates clockwise 20 degree relative to the desired space K, the obtained direction for rotating spinal cord in image is relative to perpendicular
Histogram is to can also rotate clockwise 20 degree.
Step 304, according to the corresponding relationship in the space the target K and default rotation angle, to rotation image progress
It reversely rotates, obtains the target image.
Illustratively, when determining at least one target space K according to predetermined angle, it can recorde the space each target K
The rotation image is pressed corresponding rotation after obtaining the corresponding rotation image in the space a certain target K by corresponding rotation angle
Gyration is reversely rotated, to obtain the target image for meeting user's desired image orientation.
Optionally, image reconstruction is carried out according to the data in the space target K described at least one, obtains target image, also
May include:
It, will be in the space the target K according to the corresponding relationship in the space target K described at least one and default rotation angle
Data are reversely rotated；Image reconstruction is carried out according to the data in the space at least one target K after reverse rotation, obtains mesh
Logo image.
Illustratively, when determining at least one target space K according to predetermined angle, can recorde the space each target K with
Its corresponding rotation angle can carry out in the space target K according to corresponding rotation angle reversed before rebuilding target image
Rotation, and then according to the data reconstruction target image in the space target K after reverse rotation, to obtain meeting user's expectation figure
The target image of image aspect.
Technical solution provided in this embodiment carries out the space at least one target K obtained according to default rotation angle
It reversely rotates, and then obtains target image, so that rebuilding obtained target image meets the desired image orientation of user.
Example IV
Fig. 4 is a kind of flow diagram for MR imaging method that the embodiment of the present invention four provides, and the present embodiment is upper
On the basis of stating each embodiment, " according in the space target K described at least one data carry out image reconstruction, obtain target
Image " optimizes, as shown in figure 4, this method comprises:
Step 401 rotates angle with default according to the desired space K, determines the space at least one target K.
Wherein, the data area in the space the target K covers the main-data area in the expectation space K.
Scan data is filled in step 402, the space target K Xiang Suoshu.
Step 403 carries out image reconstruction according to the data in the space target K described at least one, to determine an at least width
Rotate image.
Step 404, according to the corresponding relationship in the space the target K and default rotation angle, an at least width is rotated
Image is reversely rotated, and is obtained an at least width and is reversely rotated image.
Step 405 reversely rotates an at least width according to default FOV information corresponding with the space expectation K and schemes
As being sheared, the target image is obtained.
Illustratively, FOV information includes the image dimension information and location information that expectation is rebuild, will be according to the space target K
The positions and dimensions size of obtained reverse rotation image desirably reconstruction image is sheared, and redundant image information is removed,
Obtain target image.The data area in the space target K as shown in Figure 2 b is greater than the data area in the desired space K, thus according to mesh
The mark space K obtain include in reconstruction image target image desired by non-user other information, according to it is expected K sky in the present embodiment
Between extra image information in the reverse rotation image that is obtained according to target K space reconstruction of corresponding FOV information removal, realize to figure
The shearing of picture.
Technical solution provided in this embodiment shears the rotational reconstruction image according to FOV information, obtains target
Image, so as to remove redundant image information.
Optionally, if carrying out image reconstruction according to the data in the space at least one target K after reverse rotation, institute is obtained
Target image is stated, then reconstruction process may include:
Step A, the main-data area according to the expectation space K is empty at least one target K after the reverse rotation
Between data area sheared, obtain at least one shearing after the space reversed target K；
Step B, image reconstruction is carried out according to the data in the space reversed target K after at least one shearing, obtained described
Target image.
Illustratively, main-data area corresponding with imageable target in the expectation space K is determined, by least one target K
After space is reversely rotated, then at least one reversed rotation is removed according to position range of the main-data area in the desired space K
The redundant data in the space target K after turning (is not at the main-data area institute in the desired space K in the space K after reverse rotation
Data in position range are redundant data), the space reversed target K after obtaining at least one shearing, after shearing
Data carry out image reconstruction in the reversed space target K, then obtain the target image, it is possible to reduce needed in image reconstruction process
The data volume of processing guarantees the reconstruction speed of image, obtains meeting the desired reconstruction image of user.
Optionally, if the quantity in the space the target K be it is multiple, according to the number in the space target K described at least one
According to image reconstruction is carried out, obtaining target image includes:
Image reconstruction is carried out respectively according to the data in multiple spaces the target K, obtains several spare reconstruction images；Root
According to several described spare reconstruction images and default weighting algorithm, the target image is obtained.
Illustratively, it can repeatedly be revolved according to the coding direction in the desired space K according to different default rotation angles
Turn, obtain the space multiple target K, for example, default rotation angle is respectively -10 degree, -20 degree, 10 degree and 20 degree, positive value indicates suitable
Hour hands rotation, negative value indicate that rotation, one angle of every rotation, MRI imaging system then acquire single pass data counterclockwise, and to
The space corresponding target K is filled, and the obtained space target K is denoted as the space target K 1, the space target K 2, target K sky respectively
Between 3, the space target K 4, later can to the space each target K carry out image reconstruction, respectively obtain rotation image 1, rotation image 2,
Image 3 and rotation image 4 are rotated, and each rotation image is reversely rotated according to corresponding default rotation angle, that is, is rotated
Image 1 rotates 10 degree, and rotation image 2 rotates 20 degree, and -10 degree of rotation image 3 rotation, -20 degree of rotation image 4 rotation obtains anti-
To rotation image 1, image 2 is reversely rotated, image 3 is reversely rotated and reversely rotates image 4, it can also be advanced by the space target K
Row carries out image reconstruction after reversely rotating again.
Illustratively, each reverse rotation image is cut according to the FOV information of the corresponding reconstruction image in the desired space K
It cuts, alternate image 1, alternate image 2, alternate image 3 and alternate image 4 after being sheared will be each in the image after shearing
The information of pixel is weighted summation according to default weighting algorithm, obtains final target image.Wherein, each pixel
Information can be gray value information, and default weighting algorithm can be to average, then will be each in 1~alternate image of alternate image 4
The gray value of a corresponding pixel points is summed and calculates average value, as the gray value of each pixel, and is shown as final
Target image.
In addition, weighting algorithm is also possible to the corresponding weight of each image setting, such as by reversely rotating and cutting
Obtained after cutting alternate image 1, alternate image 2, alternate image 3 ... alternate image N, corresponding weight are respectively w1、w2、
w3……wN, then the information of each pixel can be calculated according to following formula after summing:
Wherein, viFor the gray value of any corresponding pixel points in 1~alternate image of alternate image N, v is should after weighted calculation
The gray value of pixel, i are integer.
Technical solution provided in this embodiment, when according to the space multiple target K, when obtaining several spare reconstruction images, then
Processing is weighted to several alternate images using default weighting algorithm, obtains final target image, so that obtained reconstruction
The gray value of each pixel is more accurate in image, further improves the reconstruction quality of target image.
Embodiment five
Fig. 5 is a kind of structural schematic diagram for MR imaging apparatus that the embodiment of the present invention five provides, which can be by soft
Part and/or hardware realization can carry out MRI image reconstruction by executing MR imaging method.As shown in figure 5, the device packet
It includes:
The space K determining module 501, for determining that at least one target K is empty according to the desired space K and default rotation angle
Between, wherein the data area in the space the target K covers the main-data area in the expectation space K；
Module 502 is filled, for filling scan data to the space the target K；
Module 503 is rebuild, for carrying out image reconstruction according to the data in the space target K described at least one, obtains mesh
Logo image.
Technical solution provided in this embodiment determines at least one mesh according to the desired space K and preset rotation angle
Mark the space K, and it is expected the data area in the space target K includes the main-data area in the space K, target K sky determining backward
Between the middle data that arrive of filling scanning collection, carry out image reconstruction according to the data in the space target K, obtain desired target figure
Picture can make beating pseudo- by rebuilding target image using the space target K rotated relative to the desired space K
The region of shadow pollution is shifted, to effectively avoid the image information of beating artifact contamination key area, improves reconstruction image
Imaging effect.
On the basis of the above embodiments, the space K determining module 501 includes:
Data determination unit, for determine in the space expectation K with the associated main-data area of imageable target；
Direction-determining unit, for the coding direction according to the expectation space K according to revolving clockwise or counterclockwise
Turn at least one described default rotation angle, to determine the coding direction at least one space the target K；
The space K determination unit, according to the boundary position of the main-data area and the coding staff in the space the target K
To determining the space the target K.
On the basis of the above embodiments, the absolute value of the default rotation angle is less than 45 degree.
On the basis of the above embodiments, the data determination unit is specifically used for being determined according to the imageable target to weight
Data area of the target image built in the expectation space K, as the main-data area.
On the basis of the above embodiments, rebuilding module 503 includes:
First reconstruction unit, for carrying out image reconstruction according to the data in the space target K described at least one, with determination
An at least width rotates image；
First rotary unit, for the corresponding relationship according to the space the target K and default rotation angle, to the rotation
Image is reversely rotated, and the target image is obtained.
On the basis of the above embodiments, the first rotary unit includes:
First rotation subelement, for the corresponding relationship according to the space the target K and default rotation angle, to it is described extremely
Few width rotation image is reversely rotated, and is obtained an at least width and is reversely rotated image；
First shearing subelement, for basis default FOV information corresponding with the space expectation K to an at least width
It reversely rotates image to be sheared, obtains the target image；
On the basis of the above embodiments, module 503 is rebuild further include:
Second rotary unit will for the corresponding relationship according to the space target K described at least one and default rotation angle
Data in the space the target K are reversely rotated；
Second reconstruction unit, for carrying out image weight according to the data in the space at least one target K after reverse rotation
It builds, obtains target image.
On the basis of the above embodiments, the second reconstruction unit includes:
Second shearing subelement, for according to it is described expectation the space K main-data area to after the reverse rotation extremely
The data area in a few space target K is sheared, the space reversed target K after obtaining at least one shearing；
Subelement is rebuild, for carrying out image reconstruction according to the data in the space reversed target K after at least one shearing,
Obtain the target image.
On the basis of the above embodiments, if the quantity in the space the target K be it is multiple, rebuild module 503 further include:
It is standby to obtain several for carrying out image reconstruction respectively according to the data in multiple spaces the target K for reconstruction unit
Use reconstruction image；
Weighted units, for obtaining the target image according to several described spare reconstruction images and default weighting algorithm.
Magnetic resonance provided by any embodiment of the invention can be performed in the MR imaging apparatus provided in above-described embodiment
Imaging method has and executes the corresponding functional module of this method and beneficial effect.The not skill of detailed description in the above-described embodiments
Art details, reference can be made to MR imaging method provided by any embodiment of the invention.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above embodiments to the present invention
It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also
It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (10)
1. a kind of MR imaging method characterized by comprising
According to the desired space K and default rotation angle, the space at least one target K is determined, wherein the number in the space the target K
According to the main-data area for it is expected space K described in region overlay；
Scan data is filled to the space the target K；
Image reconstruction is carried out according to the data in the space target K described at least one, obtains the target image of imageable target；
Wherein, according to the desired space K and default rotation angle, the space at least one target K is determined, comprising:
Determine in the space expectation K with the associated main-data area of imageable target；
Coding direction according to the expectation space K according to rotating at least one described default rotation clockwise or counterclockwise
Angle, to determine the coding direction at least one space the target K；
According to the boundary position of the main-data area and the coding direction in the space the target K, determine that the target K is empty
Between.
2. the method according to claim 1, wherein the absolute value of the default rotation angle is less than 45 degree.
3. the method according to claim 1, wherein determining associated with imageable target in the space expectation K
Main-data area, comprising:
The data area of target image to be reconstructed in the expectation space K is determined according to the imageable target, as described
Main-data area.
4. the method according to claim 1, wherein according to the data in the space target K described at least one into
Row image reconstruction obtains the target image of imageable target, comprising:
Image reconstruction is carried out according to the data in the space target K described at least one, to determine that an at least width rotates image；
According to the corresponding relationship in the space the target K and default rotation angle, at least width rotation image is carried out reversed
Rotation, obtains the target image.
5. according to the method described in claim 4, it is characterized in that, according to pair in the space the target K and default rotation angle
It should be related to, at least width rotation image is reversely rotated, the target image is obtained, comprising:
According to the corresponding relationship in the space the target K and default rotation angle, at least width rotation image is carried out reversed
Rotation obtains an at least width and reversely rotates image；
Image is reversely rotated to an at least width according to default visual field FOV information corresponding with the space expectation K to cut
It cuts, obtains the target image.
6. the method according to claim 1, wherein according to the data in the space target K described at least one into
Row image reconstruction obtains the target image of imageable target, comprising:
According to the corresponding relationship in the space target K described at least one and default rotation angle, by the data in the space the target K
It is reversely rotated；
Image reconstruction is carried out according to the data in the space at least one target K after reverse rotation, obtains the target image.
7. according to the method described in claim 6, it is characterized in that, according in the space at least one target K after reverse rotation
Data carry out image reconstruction, obtain the target image, comprising:
According to the main-data area in the expectation space K to the data field in the space at least one target K after the reverse rotation
Domain is sheared, the space reversed target K after obtaining at least one shearing；
Image reconstruction is carried out according to the data in the space reversed target K after at least one shearing, obtains the target image.
8. the method according to claim 1, wherein if the quantity in the space the target K be it is multiple, according to extremely
Data in a few space the target K carry out image reconstruction, and the target image for obtaining imageable target includes:
Image reconstruction is carried out respectively according to the data in multiple spaces the target K, obtains several spare reconstruction images；
It is weighted and averaged according to several described spare reconstruction images, obtains the target image.
9. a kind of MR imaging apparatus characterized by comprising
The space K determining module, for determining the space at least one target K according to the desired space K and default rotation angle, wherein
The data area in the space the target K covers the main-data area in the expectation space K；
Module is filled, for filling scan data to the space the target K；
Module is rebuild, for carrying out image reconstruction according to the data in the space target K described at least one, obtains imageable target
Target image；
Wherein, the space K determining module includes:
Data determination unit, for determine in the space expectation K with the associated main-data area of imageable target；
Direction-determining unit, for according to it is described expectation the space K coding direction according to rotate clockwise or counterclockwise to
A few default rotation angle, to determine the coding direction at least one space the target K；
The space K determination unit, according to the boundary position of the main-data area and the coding direction in the space the target K, really
The fixed space the target K.
10. device according to claim 9, which is characterized in that if the quantity in the space the target K be it is multiple, it is described
Rebuilding module includes:
It is spare heavy to obtain several for carrying out image reconstruction respectively according to the data in multiple spaces the target K for reconstruction unit
Build image；
Weighted units obtain the target image for being weighted and averaged according to several described spare reconstruction images.
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