CN106842084A - A kind of MR imaging method and device - Google Patents
A kind of MR imaging method and device Download PDFInfo
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- CN106842084A CN106842084A CN201611258530.1A CN201611258530A CN106842084A CN 106842084 A CN106842084 A CN 106842084A CN 201611258530 A CN201611258530 A CN 201611258530A CN 106842084 A CN106842084 A CN 106842084A
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- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
Abstract
A kind of MR imaging method and device are the embodiment of the invention provides, the method includes：According to K spaces and the default anglec of rotation is expected, at least one target K spaces are determined, wherein, the data area in the target K spaces covers the main-data area in the expectation K spaces；Scan data is filled to the target K spaces；Data in the target K spaces according at least one carry out image reconstruction, obtain target image.The embodiment of the present invention is by using above-mentioned technical proposal, using relative to expecting that K spaces rotate the target K spaces that obtain to rebuild target image, can be shifted the region of beating artifact contamination, so as to be prevented effectively from 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 method and device.
Background technology
Mr imaging technique (Magnetic Resonance Imaging, MRI) is using 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 generation covibration, the energy of hydrogen nuclei absorption alternating field, the outside emittance 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 by after computer disposal, it is possible to obtain the cross-section image of human body.Typical MR imaging method in the prior art
It is as follows：After the current signal that receiving coil is induced is through Analog-digital Converter, data signal is obtained, by data signal according to certain
Coding direction be filled into K spaces, wherein, K spaces are a kind of data packing spaces of original magnetic resonance signal, and user can be
Desired reconstruction image orientation is set on magnetic resonance device, for example, desired reconstruction image orientation can be set for sagittal plane, horizontal stroke
Section or coronal-plane or any angle, according to desired reconstruction image orientation, the data that will be gathered are filled according to coding direction
To K spaces, after the data in K spaces are processed through image reconstruction algorithm, a certain cross-section image of human body can be reconstructed.
Artifact refers to script scanned object and in the absence of and the image of various forms that occurs on image, common in magnetic
Shake in imaging, the beating of blood vessel or cerebrospinal fluid is the main source of artifact.Traditional mr imaging technique, typically can be number
According to collection selection frequency coding direction (Frequency Encoding Direction, also referred to as readout direction (Readout
Direction, abbreviation RO)) and phase-encoding direction (Phase Encoding Direction, abbreviation PE), because phase is compiled
The time of the time far above the collection of frequency coding bearing data of code direction data acquisition, therefore beaten by organ and caused
Data difference easily occur on the direction of phase code so that reconstruction image obscure, or artifact overlap it is interested
On key position.Generally phase-encoding direction is provided parallel to or perpendicular to following three direction：Head pin direction (head-
Feet), fore-and-aft direction (anterior-posterior) and left and right directions (left-right), so as to limit the dirt of beating artifact
Dye region.
But, inventor has found that prior art has following defect in research process of the invention is carried out：In some feelings
Under condition, set phase-encoding direction can make beating artifact be added to just the pass of clinical diagnosis in traditional magnetic resonance imaging
Key position, imaging effect is poor.
The content 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 into
As the technological deficiency that technology imaging effect is poor.
In a first aspect, a kind of MR imaging method is the embodiment of the invention provides, including：
According to K spaces and the default anglec of rotation is expected, at least one target K spaces are determined, wherein, the target K spaces
Data area cover the main-data area in the expectation K spaces；
Scan data is filled to the target K spaces；
Data in the target K spaces according at least one carry out image reconstruction, obtain target image.
Second aspect, the embodiment of the present invention additionally provides a kind of MR imaging apparatus, including：
K spaces determining module, for according to K spaces and the default anglec of rotation is expected, determining at least one target K spaces,
Wherein, the data area in the target K spaces covers the main-data area in the expectation K spaces；
Filling module, for filling scan data to the target K spaces；
Module is rebuild, image reconstruction is carried out for the data in the target K spaces according at least one, obtain target figure
Picture.
Technical scheme provided in an embodiment of the present invention, according to K spaces and the default anglec of rotation is expected, determines at least one
Individual target K spaces, and the data area in target K spaces includes the main-data area for expecting K spaces, the backward target for determining
The data that scanning collection is arrived are filled in K spaces, the data in target K spaces carry out image reconstruction, obtain desired target
Image, the embodiment of the present invention by using above-mentioned technical proposal, using relative to expecting that K spaces rotate the target K for obtaining
Space rebuilds target image, can be shifted the region of beating artifact contamination, so as to be prevented effectively from beating artifact contamination
The image information of key area, improves the imaging effect of reconstruction image.
Brief description of the drawings
Technical scheme in order to illustrate more clearly the embodiments of the present invention, institute in being described to the embodiment of the present invention below
The accompanying drawing for needing to use is briefly described, it should be apparent that, drawings in the following description are only some implementations of the invention
Example, for those of ordinary skill in the art, on the premise of not paying creative work, can also implement according to the present invention
The content and these accompanying drawings of example obtain other accompanying drawings.
Fig. 1 a are a kind of schematic flow sheet of MR imaging method that the embodiment of the present invention one is provided；
Fig. 1 b are the magnetic resonance imaging Contrast on effect schematic diagram that the embodiment of the present invention one is provided；
Fig. 2 a are a kind of schematic flow sheet of MR imaging method that the embodiment of the present invention two is provided；
Fig. 2 b are the target K spaces schematic diagram that the embodiment of the present invention two is provided；
Fig. 3 is a kind of schematic flow sheet of MR imaging method that the embodiment of the present invention three is provided；
Fig. 4 is a kind of schematic flow sheet of MR imaging method that the embodiment of the present invention four is provided；
Fig. 5 is a kind of structural representation of MR imaging apparatus that the embodiment of the present invention five is provided.
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 limitation of the invention.It also should be noted that, in order to just
Part rather than entire infrastructure related to the present invention is illustrate only in description, accompanying drawing.
It should be mentioned that some exemplary embodiments are described as before exemplary embodiment is discussed in greater detail
The treatment described as flow chart or method.Although each step to be described as flow chart the treatment of order, many of which
Step can be implemented concurrently, concomitantly or simultaneously.Additionally, the order of each step can be rearranged.When its operation
The treatment can be terminated during completion, it is also possible to have the additional step being not included in accompanying drawing.The treatment can be with
Corresponding to method, function, code, subroutine, subprogram etc..
Embodiment one
Fig. 1 a are a kind of schematic flow sheet of MR imaging method that the embodiment of the present invention one is provided, and the method is applied to
The situation of MR image reconstruction, the method can be performed by MR imaging apparatus, and wherein the device can be by software and/or hard
Part is realized.As shown in Figure 1a, the method includes：
Step 101, according to expect K spaces and the default anglec of rotation, determine at least one target K spaces.
Wherein, the data area in the target K spaces covers the main-data area in the expectation K spaces.
Typically, K spaces are the packing space of magnetic resonance signal, and each width reconstruction image has corresponding K space data.
Exemplary, expecting that K spaces refer to the corresponding K spaces of the desired reconstruction image of user, user can be in MRI
Imaging device interface sets orientation, the visual field (Field of View, abbreviation FOV) size and the image of desired reconstruction image
The parameters such as spatial resolution, wherein, FOV sizes are the size of desired reconstruction image, when scanning each time, accordingly
FOV information is to determine, the corresponding relation of the parameter according to above-mentioned setting and K spatial parameters, it may be determined that expect the volume in K spaces
The interval in code direction, the data area scope in expectation K spaces and neighbouring sample point.The default anglec of rotation is based on expectation K spaces
Coding direction setting the anglec of rotation, can be that user is manually entered, or based on experience value in MRI imaging systems
In pre-enter, it would be desirable to K spaces are rotated according to the default anglec of rotation, can obtain at least one relative to expecting K
The target K spaces of Space Rotating.Main-data area refers to the main data area of imageable target, and such as imageable target is
Spinal cord, then main-data area should at least including all scan datas for rebuilding spinal cord.
Step 102, to the target K spaces fill scan data.
Exemplary, scan data is filled into target K spaces according to the coding direction in target K spaces.The coding in K spaces
After direction rotates, compared with the order of K space sampling datas is expected, the sampling order in target K spaces can change, from
And the position of artifact is shifted when causing reconstruction image.
Data in step 103, the target K spaces according at least one carry out image reconstruction, obtain target image.
Exemplary, the data to being filled at least one target K spaces carry out image reconstruction according to image reconstruction algorithm,
For example inverse fourier transform (2DFT) is carried out to the scan data filled in target K spaces to calculate, obtain target image.
The technical scheme that the present embodiment is provided, according to K spaces and the default anglec of rotation is expected, determines at least one mesh
Mark K spaces, and the data area in target K spaces includes the main-data area for expecting K spaces, the backward target K for determining it is empty
Between the middle filling data that arrive of scanning collection, the data in target K spaces carry out image reconstruction, obtain desired target figure
Picture, by using relative to expecting that K spaces rotate the target K spaces that obtain to rebuild target image, can make beating pseudo-
The region of shadow pollution is shifted, and so as to be prevented effectively from the image information of beating artifact contamination key area, improves reconstruction image
Imaging effect.
Further, Fig. 1 b are the magnetic resonance imaging Contrast on effect schematic diagram that the embodiment of the present invention one is provided, the A in Fig. 1 b
Figure is the myelogram picture obtained according to the data reconstruction expected in K spaces using prior art, and the B figures in Fig. 1 b are using one
The spinal cord reconstruction image that data in target K spaces are obtained, the coding direction in target K spaces is relative to expectation K Space Rotatings
30 degree or so, it is seen that the spinal cord position for obtaining arrow meaning in image using prior art has a large amount of white artifacts, and adopts
Rebuild in the reconstruction image for obtaining with technical scheme provided in an embodiment of the present invention, the artifact at spinal cord position greatly reduces, improved
The imaging effect of image.
Embodiment two
Fig. 2 a are a kind of schematic flow sheet of MR imaging method that the embodiment of the present invention two is provided, and the present embodiment is upper
State on the basis of embodiment one, pair at least one target K spaces of determination optimize.As shown in Figure 2 a, the method includes：
Step 201, determine the main-data area that is associated with imageable target in the expectation K spaces.
Optionally, the data field of target image to be reconstructed in the expectation K spaces is determined according to the imageable target
Domain, as the main-data area.
Exemplary, imageable target refers to that user expects to obtain the position of MR images, for example imageable target can for spinal cord,
The position such as cardiovascular injuries or pelvic cavity, main-data area refers to expect the key data area in K spaces for reestablishment imaging target
Domain, imaging position is different, then main-data area is also different, can determine the corresponding main data area of imageable target 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 coding direction in the expectation K spaces according to rotating at least one clockwise or counterclockwise
The default anglec of rotation, to determine the coding direction in target K spaces described at least one.
Exemplary, it would be desirable to which that RO and the PE direction in K spaces are rotated according to the default anglec of rotation, direction of rotation can be with
Clockwise or counterclockwise, to obtain RO and the PE direction at least one target K spaces.
Exemplary, Fig. 2 b are the target K spaces schematic diagram that the embodiment of the present invention two is provided, as shown in Figure 2 b, in figure
Dashed rectangle represents expectation K spaces, and dotted line shown in RO and PE represents the readout direction and phase code side for expecting K spaces respectively
Represent a target K space to, solid-line rectangle, θ represents target K spaces relative to the anglec of rotation for expecting K spaces, 1RO and
Solid line shown in 1PE represents the corresponding readout direction in target K spaces and phase-encoding direction respectively.
The coding direction of step 203, the boundary position according to the main-data area and the target K spaces, it is determined that
The target K spaces.
Exemplary, the border in target K spaces is determined according to the boundary position information for expecting the main-data area in K spaces
Positional information, as shown in Figure 2 b, target K spaces can include expecting completely the data area in K spaces, but generally main-data area
To expect the central data area in K spaces, to reduce data volume, accelerate data processing speed, target K spaces covering main data area
Domain can reconstruct imageable target, and such as target K spaces can not include expecting the data boundary region in K spaces, make target K empty
Between cover the data area for expecting K spaces 90%.
Step 204, to the target K spaces fill scan data.
Exemplary, target K spaces are that the K obtained after the default anglec of rotation is rotated relative to the coding direction for expecting K spaces
Space, it is determined that after the coding direction and the data area to be included in target K spaces, filling corresponding to target K spaces
Scan data.
Data in step 205, the target K spaces according at least one carry out image reconstruction, obtain target image.
The technical scheme that the present embodiment is provided, determines at least according to the coding direction for expecting K spaces with the default anglec of rotation
One coding direction in target K spaces, by expecting the main-data area in K spaces for reestablishment imaging target, according to main number
According to the data area that the boundary position information in region determines to be covered needed at least one target K spaces, that is, determine target K spaces
Border, so as to scan data is filled into target K spaces, and rebuilds target image.Carried out by using relative to expectation K spaces
The target K spaces that obtain of rotation rebuild target image so that the region of beating artifact contamination is shifted, so as to effectively keep away
Exempt from the image information of beating artifact contamination key area, improve the imaging effect of reconstruction image, because target K spaces contain the phase
Hope the main-data area in K spaces so that the target image of reconstruction there can be preferable contrast.
Optionally, the absolute value of the default anglec of rotation is less than 45 degree.
Exemplary, if the anglec of rotation for turning clockwise is defined as just, to specify by the anglec of rotation of rotate counterclockwise
It is negative, it can be -10 degree, -20 degree, 10 degree or 20 degree etc. for example to preset the anglec of rotation, it is determined that at least one target K spaces
When, the absolute value of corresponding rotation angle is less than 45 degree, by the anglec of rotation in limited target K spaces, can be effectively improved
Due to main field is uneven or chemical shift caused by reconstruction image deformation ambiguity.
Further, if imageable target is different, the corresponding default rotation in target K spaces that optimum image rebuilds effect is obtained
Gyration is likely to difference, when the angle value of the default anglec of rotation is chosen, can carry out sample by different imageable targets
Statistics, such as determines target K spaces to each imageable target with the different anglecs of rotation, and carries out image reconstruction, will can obtain
The anglec of rotation is preferably preset when the corresponding anglec of rotation in target K spaces is defined as rebuilding the imageable target when imaging effect is optimal
Degree.
Embodiment three
Fig. 3 is a kind of schematic flow sheet of MR imaging method that the embodiment of the present invention three is provided, and the present embodiment is upper
On the basis of stating each embodiment, to " data in the target K spaces according at least one carry out image reconstruction, obtain target
Image " is optimized, as shown in figure 3, the method includes：
Step 301, according to expect K spaces and the default anglec of rotation, determine at least one target K spaces.
Wherein, the data area in the target K spaces covers the main-data area in the expectation K spaces.
Step 302, to the target K spaces fill scan data.
Data in step 303, the target K spaces according at least one carry out image reconstruction, to determine an at least width
Rotation image.
Exemplary, to the data at least one target K spaces, image reconstruction is carried out according to image reconstruction algorithm, obtain
Image is rotated to an at least width, the rotation image refers to be rotated relative to the image for expecting K spaces, for example, expect that K is empty
Between imageable target be spinal cord, user set reconstruction image orientation for sagittal plane, i.e. spinal cord vertically present on the display apparatus,
If target K spaces turn clockwise 20 degree relative to expectation K spaces, the direction of spinal cord is relative to perpendicular in the rotation image for obtaining
Nogata is to can also rotate clockwise 20 degree.
Step 304, the corresponding relation according to the target K spaces and the default anglec of rotation, are carried out to the image that rotates
Reversely rotate, obtain the target image.
Exemplary, when at least one target K spaces are determined according to predetermined angle, each target K spaces can be recorded
The corresponding anglec of rotation, after the corresponding rotation image in a certain target K spaces is obtained, corresponding rotation is pressed by the rotation image
Gyration is reversely rotated, so as to be met the target image in user's desired image orientation.
Optionally, the data in the target K spaces according at least one carry out image reconstruction, obtain target image, also
Can include：
The corresponding relation of target K spaces and the default anglec of rotation according at least one, by the target K spaces
Data are reversely rotated；The data at least one target K spaces after according to reverse rotation carry out image reconstruction, obtain mesh
Logo image.
It is exemplary, when determining at least one target K spaces according to predetermined angle, can record each target K spaces with
Its corresponding anglec of rotation, before target image is rebuild, target K spaces can be carried out reversely according to the corresponding anglec of rotation
Rotation, and then the data reconstruction target image in the target K spaces after reverse rotation, so as to be met user's expectation figure
The target image of image aspect.
The technical scheme that the present embodiment is provided, at least one target K spaces obtained according to the default anglec of rotation are carried out
Reversely rotate, and then obtain target image so that rebuild the target image for obtaining and meet the desired image orientation of user.
Example IV
Fig. 4 is a kind of schematic flow sheet of MR imaging method that the embodiment of the present invention four is provided, and the present embodiment is upper
On the basis of stating each embodiment, to " data in the target K spaces according at least one carry out image reconstruction, obtain target
Image " is optimized, as shown in figure 4, the method includes：
Step 401, according to expect K spaces and the default anglec of rotation, determine at least one target K spaces.
Wherein, the data area in the target K spaces covers the main-data area in the expectation K spaces.
Step 402, to the target K spaces fill scan data.
Data in step 403, the target K spaces according at least one carry out image reconstruction, to determine an at least width
Rotation image.
Step 404, the corresponding relation according to the target K spaces and the default anglec of rotation, at least width rotation
Image is reversely rotated, and is obtained an at least width and is reversely rotated image.
Step 405, basis default FOV information corresponding with the expectation K spaces are reversely rotated to an at least width to be schemed
As being sheared, the target image is obtained.
Exemplary, FOV information includes image dimension information and the positional information expecting to rebuild, will be according to target K spaces
The positions and dimensions size of the reverse rotation image for obtaining desirably reconstruction image is sheared, and removes redundant image information,
Obtain target image.The data area in target K spaces is more than the data area for expecting K spaces as shown in Figure 2 b, thus according to mesh
Mark K spaces obtain reconstruction image includes the other information of target image desired by non-user, empty according to K is expected in the present embodiment
Between unnecessary image information in the reverse rotation image that is obtained according to target K space reconstructions of corresponding FOV information removal, realize to figure
The shearing of picture.
The technical scheme that the present embodiment is provided, shears according to FOV information to the rotational reconstruction image, obtains target
Image, such that it is able to remove redundant image information.
Optionally, if the data at least one target K spaces after according to reverse rotation carry out image reconstruction, institute is obtained
Target image is stated, then process of reconstruction can include：
It is step A, empty at least one target K after the reverse rotation according to the main-data area in the expectation K spaces
Between data area sheared, obtain the reverse target K spaces after at least one shearing；
Step B, the data in the reverse target K spaces after at least one shearing carry out image reconstruction, obtain described
Target image.
Exemplary, main-data area corresponding with imageable target in expectation K spaces is determined, by least one target K
After space is reversely rotated, then the reversely rotation of position range removal at least one according to main-data area in K spaces are expected
Redundant data in target K spaces after turning (is not at expecting the main-data area institute in K spaces in the K spaces after reverse rotation
Data in the range of position are redundant data), the reverse target K spaces after at least one shearing are obtained, after shearing
Data carry out image reconstruction in reverse target K spaces, then obtain the target image, it is possible to reduce needed for image reconstruction process
The data volume for the treatment of, it is ensured that the reconstruction speed of image, is met the desired reconstruction image of user.
Optionally, if the quantity in the target K spaces is multiple, the number in the target K spaces according at least one
According to image reconstruction is carried out, obtaining target image includes：
Data in multiple target K spaces carry out image reconstruction respectively, obtain several standby reconstruction images；Root
According to described several standby reconstruction images and default weighting algorithm, the target image is obtained.
Exemplary, can repeatedly be revolved according to the different default anglecs of rotation according to the coding direction for expecting K spaces
Turn, obtain multiple target K spaces, for example, the default anglec of rotation be respectively -10 degree, -20 degree, 10 degree and 20 degree, it is suitable on the occasion of expression
Hour hands rotate, and negative value represents rotate counterclockwise, often rotate an angle, and MRI imaging systems then gather single pass data, and to
Corresponding target K spaces are filled, and it is empty that the target K spaces for obtaining are denoted as target K spaces 1, target K spaces 2, target K respectively
Between 3, target K spaces 4, can carry out image reconstruction to each target K spaces afterwards, respectively obtain rotation image 1, rotation image 2,
Rotation image 3 and rotation image 4, and each rotation image is reversely rotated according to the corresponding default anglec of rotation, that is, rotate
Image 1 rotates 10 degree, and rotation image 2 rotates 20 degree, and rotation image 3 rotates -10 degree, and rotation image 4 rotates -20 degree, obtains anti-
To rotation image 1, image 2 is reversely rotated, image 3 is reversely rotated and reversely rotates image 4, it is also possible to which target K spaces is advanced
Row carries out image reconstruction again after reversely rotating.
Exemplary, each reverse rotation image is cut according to the FOV information for expecting the corresponding reconstruction image in K spaces
Cut, alternate image 1, alternate image 2, alternate image 3 and alternate image 4 after being sheared, by the image after shearing each
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 individual corresponding pixel points is sued for peace and is calculated average value, as the gray value of each pixel, and is shown as final
Target image.
Other, weighting algorithm can also be 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 is respectively w1、w2、
w3……wN, then the information of each pixel can be calculated according to equation below after suing for peace：
Wherein, viIt is 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 is integer.
The technical scheme that the present embodiment is provided, when according to multiple target K spaces, when obtaining several standby reconstruction images, then
Treatment is weighted to several alternate images using default weighting algorithm, final target image is obtained so that the reconstruction for obtaining
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 representation of MR imaging apparatus that the embodiment of the present invention five is provided, and the device can be by soft
Part and/or hardware realization, can carry out MRI image reconstruction by performing MR imaging method.As shown in figure 5, the device bag
Include：
K spaces determining module 501, for according to K spaces and the default anglec of rotation is expected, determining that at least one target K is empty
Between, wherein, the data area in the target K spaces covers the main-data area in the expectation K spaces；
Filling module 502, for filling scan data to the target K spaces；
Module 503 is rebuild, image reconstruction is carried out for the data in the target K spaces according at least one, obtain mesh
Logo image.
The technical scheme that the present embodiment is provided, according to K spaces and the default anglec of rotation is expected, determines at least one mesh
Mark K spaces, and the data area in target K spaces includes the main-data area for expecting K spaces, the backward target K for determining it is empty
Between the middle filling data that arrive of scanning collection, the data in target K spaces carry out image reconstruction, obtain desired target figure
Picture, by using relative to expecting that K spaces rotate the target K spaces that obtain to rebuild target image, can make beating pseudo-
The region of shadow pollution is shifted, and so as to be prevented effectively from the image information of beating artifact contamination key area, improves reconstruction image
Imaging effect.
On the basis of above-described embodiment, K spaces determining module 501 includes：
Data determination unit, for the main-data area for determining to be associated with imageable target in the expectation K spaces；
Direction-determining unit, for the coding direction according to the expectation K spaces according to revolving clockwise or counterclockwise
Turn to preset the anglec of rotation described at least one, to determine the coding direction in target K spaces described at least one；
K spaces determining unit, the coding staff of boundary position and the target K spaces according to the main-data area
To determining the target K spaces.
On the basis of above-described embodiment, the absolute value of the default anglec of rotation is less than 45 degree.
On the basis of above-described embodiment, the data determination unit according to the imageable target specifically for determining to treat weight
Data area of the target image built in the expectation K spaces, as the main-data area.
On the basis of above-described embodiment, rebuilding module 503 includes：
First reconstruction unit, image reconstruction is carried out for the data in the target K spaces according at least one, to determine
An at least width rotates image；
First rotary unit, for the corresponding relation according to the target K spaces and the default anglec of rotation, to the rotation
Image is reversely rotated, and obtains the target image.
On the basis of above-described embodiment, the first rotary unit includes：
First rotation subelement, for the corresponding relation according to the target K spaces and the default anglec of rotation, 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 expectation K spaces to an at least width
Reversely rotate image to be sheared, obtain the target image；
On the basis of above-described embodiment, rebuilding module 503 also includes：
Second rotary unit, for the target K spaces according at least one and the corresponding relation of the default anglec of rotation, incites somebody to action
Data in the target K spaces are reversely rotated；
Second reconstruction unit, image weight is carried out for the data at least one target K spaces after according to reverse rotation
Build, obtain target image.
On the basis of above-described embodiment, the second reconstruction unit includes：
Second shearing subelement, for the main-data area according to the expectation K spaces to after the reverse rotation extremely
The data area in a few target K space is sheared, and obtains the reverse target K spaces after at least one shearing；
Subelement is rebuild, image reconstruction is carried out for the data in the reverse target K spaces after at least one shearing,
Obtain the target image.
On the basis of above-described embodiment, if the quantity in the target K spaces is multiple, rebuilding module 503 also includes：
Reconstruction unit, image reconstruction is carried out for the data in multiple target K spaces respectively, obtains several standby
Use reconstruction image；
Weighted units, for according to described several standby reconstruction images and default weighting algorithm, obtaining the target image.
The MR imaging apparatus provided in above-described embodiment can perform the magnetic resonance that any embodiment of the present invention is provided
Imaging method, possesses the execution corresponding functional module of the method and beneficial effect.The not skill of detailed description in the above-described embodiments
Art details, reference can be made to the MR imaging method that any embodiment of the present invention is provided.
Note, above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious changes,
Readjust and substitute without departing from protection scope of the present invention.Therefore, although the present invention is carried out by above example
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
More other Equivalent embodiments can be included, and the scope of the present invention is determined by scope of the appended claims.
Claims (11)
1. a kind of MR imaging method, it is characterised in that including：
According to K spaces and the default anglec of rotation is expected, at least one target K spaces are determined, wherein, the number in the target K spaces
According to the main-data area that K spaces are expected described in region overlay；
Scan data is filled to the target K spaces；
Data in the target K spaces according at least one carry out image reconstruction, obtain target image.
2. method according to claim 1, it is characterised in that according to K spaces and the default anglec of rotation is expected, it is determined that at least
One target K space, including：
Determine the main-data area associated with imageable target in the expectation K spaces；
According to the coding direction in the expectation K spaces rotation is preset according to described in rotation at least one clockwise or counterclockwise
Angle, to determine the coding direction in target K spaces described at least one；
The coding direction of boundary position and the target K spaces according to the main-data area, determines that the target K is empty
Between.
3. method according to claim 2, it is characterised in that the absolute value of the default anglec of rotation is less than 45 degree.
4. method according to claim 2, it is characterised in that determine what is associated with imageable target in the expectation K spaces
Main-data area, including：
The data area of target image to be reconstructed in the expectation K spaces is determined according to the imageable target, as described
Main-data area.
5. method according to claim 1, it is characterised in that the data in the target K spaces according at least one are entered
Row image reconstruction, obtains target image, including：
Data in the target K spaces according at least one carry out image reconstruction, to determine at least width rotation image；
According to the target K spaces and the corresponding relation of the default anglec of rotation, at least width rotation image is carried out reversely
Rotation, obtains the target image.
6. method according to claim 5, it is characterised in that right with the default anglec of rotation according to the target K spaces
Should be related to, at least width rotation image is reversely rotated, obtain the target image, including：
According to the target K spaces and the corresponding relation of the default anglec of rotation, at least width rotation image is carried out reversely
Rotation, obtains an at least width and reversely rotates image；
Image is reversely rotated to an at least width to shear, obtain according to default FOV information corresponding with the expectation K spaces
To the target image.
7. method according to claim 1, it is characterised in that the data in the target K spaces according at least one are entered
Row image reconstruction, obtains target image, including：
The corresponding relation of target K spaces and the default anglec of rotation according at least one, by the data in the target K spaces
Reversely rotated；
The data at least one target K spaces after according to reverse rotation carry out image reconstruction, obtain the target image.
8. method according to claim 7, it is characterised in that at least one target K spaces after according to reverse rotation
Data carry out image reconstruction, obtain the target image, including：
The data field of main-data area according to the expectation K spaces at least one target K spaces after the reverse rotation
Domain is sheared, and obtains the reverse target K spaces after at least one shearing；
Data in the reverse target K spaces after at least one shearing carry out image reconstruction, obtain the target image.
9. method according to claim 1, it is characterised in that if the quantity in the target K spaces is multiple, according to extremely
Data in a few target K space carry out image reconstruction, and obtaining target image includes：
Data in multiple target K spaces carry out image reconstruction respectively, obtain several standby reconstruction images；
According to described several standby reconstruction images and default weighting algorithm, the target image is obtained.
10. a kind of MR imaging apparatus, it is characterised in that including：
K spaces determining module, for according to K spaces and the default anglec of rotation is expected, determining at least one target K spaces, wherein,
The data area in the target K spaces covers the main-data area in the expectation K spaces；
Filling module, for filling scan data to the target K spaces；
Module is rebuild, image reconstruction is carried out for the data in the target K spaces according at least one, obtain target image.
11. devices according to claim 10, it is characterised in that described if the quantity in the target K spaces is multiple
Rebuilding module includes：
Reconstruction unit, image reconstruction is carried out for the data in multiple target K spaces respectively, obtains several standby heavy
Build image；
Weighted units, for according to described several standby reconstruction images and default weighting algorithm, obtaining the target image.
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