CN110261801A - A kind of RF excited method and device - Google Patents
A kind of RF excited method and device Download PDFInfo
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- CN110261801A CN110261801A CN201910532780.7A CN201910532780A CN110261801A CN 110261801 A CN110261801 A CN 110261801A CN 201910532780 A CN201910532780 A CN 201910532780A CN 110261801 A CN110261801 A CN 110261801A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/48—NMR imaging systems
Abstract
The embodiment of the present application discloses a kind of RF excited method and device, this method comprises: obtaining the radio-frequency field distribution data of magnetic resonance equipment in advance；Radio-frequency field distribution data include the corresponding radio-frequency field intensity in multiple sampling locations in magnetic resonance equipment；In each RF excited, the current imaging slice of this RF excited is obtained；Position and radio-frequency field distribution data based on current imaging slice are corrected the radio frequency waveform of this RF excited output；Radio frequency waveform after output calibration, to realize this RF excited, expected radio-frequency field intensity is consistent when enabling to the radio-frequency field intensity of current imaging slice with image reconstruction, to improve the quality of image reconstruction and the imaging effect of MRI.
Description
Technical field
This application involves technical field of medical equipment more particularly to a kind of RF excited method and devices.
Background technique
Magnetic resonance imaging (Magnetic Resonance Imaging, MRI) as a kind of multi-parameter, more contrasts at
It is one of main imaging mode in modern medical service iconography as technology.MRI can reflect T1, T2 and proton density of tissue
Etc. multifrequency natures, effective information can be provided for the detection and diagnosis of disease.
The basic functional principle of MRI is using electromagnetic induction phenomenon, and using RF excited, Hydrogen Proton in exciting human changes
The direction that is rotatably arranged for becoming hydrogen atom is allowed to resonate, and then analyzes hydrogen atom and resonates discharged electromagnetic wave, with gradient fields into
Row is position encoded, then receives the electromagnetic signal with location information using receiving coil, is finally reconstructed using Fourier transformation
Image information.
In MRI imaging, the radiofrequency field that radio-frequency sending coil is emitted is non-uniformity in entire space.Especially
It is to have the central radio-frequencies field intensities such as the big, deviation of equal centers (isocenter) radio-frequency field intensity along magnet direction and gradually subtract
Weak phenomenon.The inhomogeneities of radiofrequency field will affect the uniformity of reconstruction image, the accuracy of RF excited and magnetic resonance letter
Number differentiation, cause the imaging effect of MRI bad.
Summary of the invention
In view of this, the embodiment of the present application provides a kind of RF excited method and device, it is able to solve in the prior art
The bad problem of imaging effect caused by the inhomogeneities of radiofrequency field.
The embodiment of the present application first aspect provides a kind of RF excited method, comprising:
The radio-frequency field distribution data of magnetic resonance equipment are obtained in advance；The radio-frequency field distribution data include that the magnetic resonance is set
The corresponding radio-frequency field intensity in multiple sampling locations in standby；
In each RF excited, the current imaging slice of this RF excited is obtained；
Position and the radio-frequency field distribution data based on the current imaging slice, penetrate this RF excited output
Frequency waveform is corrected；
Radio frequency waveform after output calibration, to realize this RF excited.
Optionally, the position based on the current imaging slice and the radio-frequency field distribution data, to this radio frequency
The radio frequency waveform of excitation output is corrected, and is specifically included:
According to the position of the radio-frequency field distribution data and imaging slice, the corresponding correction of each imaging slice is obtained
Coefficient；
The corresponding school of the current imaging slice is determined from the obtained corresponding correction coefficient of each imaging slice
Positive coefficient；
Using the corresponding correction coefficient of the current imaging slice, school is carried out to the radio frequency waveform of this RF excited output
Just.
Optionally, the position according to the radio-frequency field distribution data and imaging slice, determines each forming sheet
The corresponding correction coefficient of layer, specifically includes:
According to the position of the radio-frequency field distribution data and imaging slice, the corresponding radio frequency of each imaging slice is obtained
Field intensity；
The ratio of default radio-frequency field intensity and the corresponding radio-frequency field intensity of the imaging slice is obtained as each institute
State the corresponding correction coefficient of imaging slice.
Optionally, the radio frequency waveform to the output of this RF excited is corrected, and is specifically included:
The amplitude and/or phase of the radio frequency waveform are corrected.
Optionally, the radio-frequency field distribution data for obtaining the magnetic resonance equipment in advance, specifically include:
Radio-frequency field distribution emulation or test are carried out to the magnetic resonance equipment using default medium, obtain the radiofrequency field point
Cloth data；
Alternatively,
It carries out RF excited test in advance when patient is on the hospital bed of the magnetic resonance equipment, obtains radiofrequency field test sequence
Column；The radio-frequency field distribution data are obtained based on the radiofrequency field cycle tests.
The embodiment of the present application second aspect provides a kind of RF excited device, comprising: radiofrequency field acquiring unit, lamella obtain
Take unit, correction unit and output unit；
The radiofrequency field acquiring unit, for obtaining the radio-frequency field distribution data of magnetic resonance equipment in advance；The radiofrequency field
Distributed data includes the corresponding radio-frequency field intensity in multiple sampling locations in the magnetic resonance equipment；
The lamella acquiring unit, for obtaining the current imaging slice of this RF excited in each RF excited；
The correction unit, for based on the current imaging slice position and the radio-frequency field distribution data, to this
The radio frequency waveform of secondary RF excited output is corrected；
The output unit, for the radio frequency waveform after output calibration, to realize this RF excited.
Optionally, the correction unit, specifically includes: coefficient obtains subelement, coefficient determines subelement and waveform correction
Subelement；
The coefficient obtains subelement, for the position according to the radio-frequency field distribution data and imaging slice, obtains every
The corresponding correction coefficient of a imaging slice；
The coefficient determines subelement, for determining institute from the obtained corresponding correction coefficient of each imaging slice
State the corresponding correction coefficient of current imaging slice；
The waveform correction subelement, for utilizing the corresponding correction coefficient of the current imaging slice, to this radio frequency
The radio frequency waveform of excitation output is corrected.
Optionally, the coefficient obtains subelement, specifically includes: intensity obtains subelement and ratio computation subunit；
The intensity obtains subelement, for the position according to the radio-frequency field distribution data and imaging slice, obtains every
The corresponding radio-frequency field intensity of a imaging slice；
The ratio computation subunit, for obtaining default radio-frequency field intensity and the corresponding radio field intensity of the imaging slice
The ratio of degree is as the corresponding correction coefficient of each imaging slice.
Optionally, the correction unit, specifically for the radio frequency waveform amplitude and/or phase be corrected.
Optionally, the radiofrequency field acquiring unit, specifically includes: first obtains subelement or the second acquisition subelement；
Described first obtains subelement, for carrying out radio-frequency field distribution emulation to the magnetic resonance equipment using default medium
Or test, obtain the radio-frequency field distribution data；
Described second obtains subelement, swashs for carrying out radio frequency in advance when patient is on the hospital bed of the magnetic resonance equipment
Test is encouraged, radiofrequency field cycle tests is obtained；The radio-frequency field distribution data are obtained based on the radiofrequency field cycle tests.
The embodiment of the present application third aspect provides a kind of computer readable storage medium, is stored thereon with computer journey
Sequence realizes the RF excited method provided such as the embodiment of the present application first aspect when the computer program is executed by processor
In any one.
The embodiment of the present application fourth aspect provides a kind of magnetic resonance equipment, comprising: processor and memory；
The memory is transferred to the processor for storing program code, and by said program code；
The processor, for executing as the embodiment of the present application first aspect is mentioned according to the instruction in said program code
Any one in the RF excited method of confession
Compared with prior art, the application has at least the following advantages:
In the embodiment of the present application, the radio-frequency field distribution data for obtaining magnetic resonance equipment in advance, determine the magnetic resonance equipment
In radio-frequency field intensity on multiple sampling locations then in each RF excited, obtain the current imaging of this RF excited
Lamella.The radio-frequency field distribution data of position and the magnetic resonance equipment again based on current imaging slice, it is defeated to this RF excited
Radio frequency waveform out is corrected, expected radiofrequency field when enabling to the radio-frequency field intensity and image reconstruction of current imaging slice
Intensity is consistent, to improve the quality of image reconstruction and the imaging effect of MRI.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The some embodiments recorded in application, for those of ordinary skill in the art, without creative efforts,
It can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is a kind of existing structural schematic diagram of magnetic resonance equipment；
Fig. 2 is a kind of schematic diagram of radiofrequency field inhomogeneities；
Fig. 3 is a kind of flow diagram of RF excited method provided by the embodiments of the present application；
Fig. 4 is the schematic diagram in cross section, coronal-plane and sagittal plane；
Fig. 5 is the flow diagram of another RF excited method provided by the embodiments of the present application；
Fig. 6 is a kind of imaging slice and its schematic diagram of corresponding correction coefficient in the application specific embodiment；
Fig. 7 a is the signal for not using the obtained image reconstruction result of radio-frequency drive method provided by the embodiments of the present application
Figure；
Fig. 7 b is showing using a kind of obtained image reconstruction result of radio-frequency drive method provided by the embodiments of the present application
It is intended to；
Fig. 8 is a kind of structural schematic diagram of RF excited device provided by the embodiments of the present application.
Specific embodiment
In order to make those skilled in the art more fully understand application scheme, below in conjunction in the embodiment of the present application
Attached drawing, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described embodiment is only this
Apply for a part of the embodiment, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art exist
Every other embodiment obtained under the premise of creative work is not made, shall fall in the protection scope of this application.
It should be appreciated that in this application, " at least one (item) " refers to one or more, and " multiple " refer to two or two
More than a."and/or" indicates may exist three kinds of relationships, for example, " A and/or B " for describing the incidence relation of affiliated partner
It can indicate: only exist A, only exist B and exist simultaneously tri- kinds of situations of A and B, wherein A, B can be odd number or plural number.Word
Symbol "/" typicallys represent the relationship that forward-backward correlation object is a kind of "or"." at least one of following (a) " or its similar expression, refers to
Any combination in these, any combination including individual event (a) or complex item (a).At least one of for example, in a, b or c
(a) can indicate: a, b, c, " a and b ", " a and c ", " b and c ", or " a and b and c ", and wherein a, b, c can be individually, can also
To be multiple.
Existing magnetic resonance equipment structure is as shown in Figure 1.Wherein, the radiofrequency field that radio-frequency sending coil is emitted is entire empty
Between in be non-uniformity.The inhomogeneities of radiofrequency field central radio-frequencies field intensity is big, deviates etc. such as has along magnet direction
The phenomenon that central radio-frequency field intensity gradually weakens.Such as shown in Fig. 2, along the axial direction (longitudinal direction) of radio-frequency sending coil, with equal centers
Relative distance it is remoter, radio-frequency field intensity gradually decreases.It but is on the one hand, to rebuild with uniform radiofrequency field when due to image reconstruction
Foundation, the inhomogeneities of radiofrequency field will affect the effect of image reconstruction；On the other hand, the inhomogeneities of radiofrequency field also results in
The problems such as inaccuracy of RF excited, the signal-to-noise ratio of generation edge tomographic image is relatively low, contrast is bad.Therefore, uneven in space
The imaging effect that even radiofrequency field will lead to MRI is bad.
In order to solve the problems, such as that the inhomogeneities of radiofrequency field causes imaging effect bad, the first existing solution is logical
The correction that the uniformity is carried out in image reconstruction is crossed, to make up influence of the inhomogeneities of radiofrequency field to image reconstruction effect.So
And the first solution does not solve the problems, such as RF excited inaccuracy.Existing second of solution is by penetrating
The accuracy for being designed to ensure that RF excited of frequency waveform.But the pulse width that will lead to radio frequency waveform for this second it is larger,
Increase the radio frequency absorption amount of patient, extend sweep time.
For this purpose, the embodiment of the present application provides a kind of RF excited method and device, based on radiofrequency field in magnetic resonance equipment
Distribution situation according to the current imaging slice of this RF excited, determine that current imaging slice is real in each RF excited
The radio-frequency field intensity on border, so as to be corrected in real time to the radio frequency waveform of output, when enabling to each RF excited,
Expected radio-frequency field intensity is consistent when the radio-frequency field intensity of current imaging slice is with image reconstruction, ensure that the quality of image reconstruction
With the accuracy of radio-frequency drive, to improve the imaging effect of MRI.Also, it is sharp that the embodiment of the present application provides a kind of radio frequency
Method and device is encouraged, without in addition design radio frequency waveform, avoids increase the radio frequency absorption amount of patient, extend sweep time etc. and ask
Topic.
Based on above-mentioned thought, in order to make the above objects, features, and advantages of the present application more apparent, below with reference to
Attached drawing is described in detail the specific embodiment of the application.
Embodiment of the method:
Referring to Fig. 3, which is a kind of flow diagram of RF excited method provided by the embodiments of the present application.
RF excited method provided by the embodiments of the present application, comprising:
S301: the radio-frequency field distribution data of magnetic resonance equipment are obtained in advance.
It should be noted that radio-frequency field distribution data include the corresponding radiofrequency field in multiple sampling locations in the magnetic resonance equipment
Actual radiofrequency field on each imaging slice position can be obtained on the magnetic resonance equipment based on the radio-frequency field distribution data in intensity
Intensity provides data basis for radio frequency waveform correction.In practical applications, it can be selected in magnetic resonance equipment according to the actual situation
Multiple sampling locations are taken, and the radio-frequency field intensity on each sampling location is tested, obtain radio-frequency field distribution data.
In some possible implementations of the embodiment of the present application, step S101 may include the possible realization of following two
Mode.
In the first possible implementation, it can use default medium and radio-frequency field distribution emulation carried out to magnetic resonance equipment
Or test, obtain radio-frequency field distribution data.
As an example, default medium can be water mould.In the specific implementation, this can be preset to medium and places the magnetic
In resonant device, radiofrequency field system testing is carried out to the magnetic resonance equipment, obtains the radio-frequency field distribution data；It can also be assumed that should
Magnetic resonance equipment is preset medium to this and is motivated, and carries out radio-frequency field distribution emulation to the magnetic resonance equipment, obtains the radiofrequency field
Distributed data.
In second of possible implementation, radio frequency can be carried out in advance when patient is on the hospital bed of magnetic resonance equipment and swashed
Test is encouraged, radiofrequency field cycle tests is obtained；Radio-frequency field distribution data are obtained based on radiofrequency field cycle tests.
What needs to be explained here is that although utilizing the means of system testing and emulation in the first possible implementation
The radio-frequency field distribution data of the available magnetic resonance equipment, but in practical applications the concrete condition of radiofrequency field also with swashed
The medium of hair is related.Therefore, in order to which the accuracy for improving radio-frequency field distribution data in the second possible implementation can
With when patient on one's sick bed when (as carry out imaging sequence scanning before), carry out one or many RF exciteds and collect radiofrequency field
Cycle tests.Then, the radio-frequency field distribution data of the magnetic resonance equipment are obtained according to the radiofrequency field cycle tests collected, protected
The accuracy of radio-frequency field distribution data has been demonstrate,proved, can guarantee the quality of image reconstruction and the accuracy of radio-frequency drive, improve MRI's
Imaging effect.The acquisition of radio-frequency drive and radiofrequency field cycle tests is similar with the acquisition of existing imaging sequence, can be using any
A kind of prior art means obtain, and which is not described herein again.
S302: in each RF excited, the current imaging slice of this RF excited is obtained.
When carrying out imaging sequence scanning, one or more imaging slices can be generally scanned.For each imaging
Lamella executes a RF excited, obtains the corresponding imaging sequence of the imaging slice, then i.e. available obtained imaging sequence,
It is to obtain the corresponding image of the imaging slice according to reconstruction with the intensity of radiofrequency field.Therefore, in the embodiment of the present application, in order to protect
The image quality for demonstrate,proving MRI, needs to be corrected the radio frequency waveform of output according to the corresponding imaging slice of each RF excited, protects
The radio-frequency field intensity for demonstrate,proving this RF excited avoids the generation for the problems such as image reconstruction is ineffective and RF excited is inaccurate.
In practical applications, the imaging slice of each RF excited can need to set according to actual scanning, can be
The imaging slice of surface sweeping is carried out to the cross section of human body, coronal-plane or sagittal plane, herein without limiting.Cross section, coronal-plane
It is as shown in Figure 4 with sagittal plane.
S303: position and radio-frequency field distribution data based on current imaging slice, to the radio frequency of this RF excited output
Waveform is corrected.
Swash it is understood that this radio frequency can be obtained in position and radio-frequency field distribution data based on current imaging slice
When encouraging, the current actual radio-frequency field intensity of imaging slice.And the intensity of radiofrequency field can be referred to when image reconstruction, when radiofrequency field unevenness
Also it will lead to ineffective to the image reconstruction of part imaging slice when even, influence the imaging effect of MRI.At this point, based on working as
The radio frequency waveform that the preceding actual radio-frequency field intensity of imaging slice exports this RF excited is corrected, it is ensured that is being imaged
The radio-frequency field intensity of current imaging slice is consistent with radio-frequency field intensity referenced by image reconstruction when sequence scanning, ensure that image
The quality of reconstruction.
In practical applications, the radio frequency waveform of output is corrected specifically can be to the amplitude of radio frequency waveform and/or
Phase is corrected, below in conjunction with a specific example explanation.
In some possible implementations of the embodiment of the present application, as shown in figure 5, step S303 can specifically include:
S3031: according to the position of radio-frequency field distribution data and imaging slice, the corresponding correction system of each imaging slice is obtained
Number.
It is understood that obtain each imaging slice actual for the position based on radio-frequency field distribution data and imaging slice
Radio-frequency field intensity and its corresponding correction coefficient, it is ensured that each imaging slice imaging sequence collected is all had preferably
Image reconstruction effect and radio-frequency drive accuracy rate.
In some possible implementations of the embodiment of the present application, step S3031 be can specifically include:
According to the position of radio-frequency field distribution data and imaging slice, the corresponding radio-frequency field intensity of each imaging slice is obtained；
The ratio of default radio-frequency field intensity and the corresponding radio-frequency field intensity of imaging slice is obtained as the corresponding correction of each imaging slice
Coefficient.Fig. 6 shows a kind of imaging slice and its corresponding correction coefficient by taking cross-section Surface scan as an example.
In the embodiment of the present application, used radio-frequency field intensity phase when presetting radio-frequency field intensity with subsequent image reconstruction
It closes, can be set according to practical situation.As an example, it is corresponding to can be each imaging slice for default radio-frequency field intensity
Maximum value in radio-frequency field intensity.
S3032: the corresponding correction of current imaging slice is determined from the obtained corresponding correction coefficient of each imaging slice
Coefficient.
S3033: using the corresponding correction coefficient of current imaging slice, the radio frequency waveform of this RF excited output is carried out
Correction.
Optionally, step S303 can specifically be realized according to following formula:
RFout=αiRFin
Wherein, RFoutFor the radio frequency waveform after correction, αiFor the corresponding correction coefficient of current imaging slice, RFinFor this
The radio frequency waveform of RF excited desired output.
In practical applications, RF excited method provided by the embodiments of the present application can be applied to all kinds of in PET system
The correction of radio-frequency pulse, including compensation pressure rouge impulse amplitude and excitation and time poly- pulse etc..
S304: the radio frequency waveform after output calibration, to realize this RF excited.
It is understood that the radio frequency waveform after correction can be generated by spectrometer device radio frequency unit and be exported to radio frequency function
It puts, after RF power amplification amplifies, output to radio-frequency sending coil (such as birdcage coil) generates radiofrequency field and realizes this RF excited.
It is explained below with reference to beneficial effect of the simulated experiment result to RF excited method provided by the embodiments of the present application
It states.
RF excited simulation is carried out using water mould, radio frequency field uniformity compensation effect is carried out by the effect of fat suppression
Test.Since the fat suppression selected based on frequency is very sensitive to the variation of radio-frequency field intensity, radio-frequency transmissions field spatial distribution
Unevenly to will lead to fat suppression effect different along longitudinal each level, by according to imaging Plane Location, in conjunction with radiofrequency field
Distributed data real time correction radio-frequency pulse, can make the fat suppression effect of each level consistent.
Fig. 7 a is illustrated a kind of not using a kind of obtained figure of radio-frequency drive method provided by the embodiments of the present application
As reconstructed results, Fig. 7 b is illustrated to use a kind of obtained image weight of radio-frequency drive method provided by the embodiments of the present application
Build result.In Fig. 7 a and 7b, ring part is the reconstruction image of fat, the intermediate round reconstruction image for water mould.Comparison diagram 7a
With 7b left hand view to can be seen that in the suppression result of fat, a kind of radio-frequency drive method provided by the embodiments of the present application be can be improved
The uniformity of radiofrequency field guarantees the effect of fat suppression.Comparison diagram 7a and 7b right part of flg to fat suppression result in can be seen that,
A kind of radio-frequency drive method provided by the embodiments of the present application can not only improve the uniformity of radiofrequency field, guarantee the effect of fat suppression
Fruit can also improve the uniformity of water mould imaging among image, improve the effect of image reconstruction, improve the imaging effect of MRI.
In the embodiment of the present application, the radio-frequency field distribution data for obtaining magnetic resonance equipment in advance, determine the magnetic resonance equipment
In radio-frequency field intensity on multiple sampling locations then in each RF excited, obtain the forming sheet of this RF excited
Layer, obtains current imaging slice.The radio-frequency field distribution data of position and the magnetic resonance equipment again based on current imaging slice are right
The radio frequency waveform of this RF excited output is corrected, and enables to the radio-frequency field intensity and image reconstruction of current imaging slice
When expected radio-frequency field intensity be consistent, to improve the quality of image reconstruction and the imaging effect of MRI.
Installation practice:
A kind of RF excited method provided based on the above embodiment, the embodiment of the present application also provides a kind of RF exciteds
Device.
Referring to Fig. 8, which is a kind of structural schematic diagram of RF excited device provided by the embodiments of the present application.
RF excited device provided by the embodiments of the present application, comprising: radiofrequency field acquiring unit 100, lamella acquiring unit
200, unit 300 and output unit 400 are corrected；
Radiofrequency field acquiring unit 100, for obtaining the radio-frequency field distribution data of magnetic resonance equipment in advance；Radio-frequency field distribution number
According to including the corresponding radio-frequency field intensity in sampling locations multiple in magnetic resonance equipment；
Lamella acquiring unit 200, for obtaining the current imaging slice of this RF excited in each RF excited；
Correct unit 300, for based on current imaging slice position and radio-frequency field distribution data, to this RF excited
The radio frequency waveform of output is corrected；
Output unit 400, for the radio frequency waveform after output calibration, to realize this RF excited.
In some possible implementations of the embodiment of the present application, correct unit 300, can specifically include: coefficient obtains
Subelement, coefficient determine subelement and waveform correction subelement；
Coefficient obtains subelement and obtains each forming sheet for the position according to radio-frequency field distribution data and imaging slice
The corresponding correction coefficient of layer；
Coefficient determines subelement, for determining current forming sheet from the obtained corresponding correction coefficient of each imaging slice
The corresponding correction coefficient of layer；
Waveform correction subelement, for being exported to this RF excited using the corresponding correction coefficient of current imaging slice
Radio frequency waveform be corrected.
In some possible implementations of the embodiment of the present application, coefficient obtains subelement, and can specifically include: intensity obtains
Take subelement and ratio computation subunit；
Intensity obtains subelement and obtains each forming sheet for the position according to radio-frequency field distribution data and imaging slice
The corresponding radio-frequency field intensity of layer；
Ratio computation subunit, for obtaining the ratio of default radio-frequency field intensity and the corresponding radio-frequency field intensity of imaging slice
As the corresponding correction coefficient of each imaging slice.
Optionally, correct unit 300, specifically for radio frequency waveform amplitude and/or phase be corrected.
In some possible implementations of the embodiment of the present application, radiofrequency field acquiring unit 100 be can specifically include: the
One obtains subelement or the second acquisition subelement；
First obtains subelement, for carrying out radio-frequency field distribution emulation or test to magnetic resonance equipment using default medium,
Obtain radio-frequency field distribution data；
Second obtains subelement, for carrying out RF excited test in advance when patient is on the hospital bed of magnetic resonance equipment,
Obtain radiofrequency field cycle tests；Radio-frequency field distribution data are obtained based on radiofrequency field cycle tests.
In the embodiment of the present application, the radio-frequency field distribution data for obtaining magnetic resonance equipment in advance, determine the magnetic resonance equipment
In radio-frequency field intensity on multiple sampling locations then in each RF excited, obtain the forming sheet of this RF excited
Layer, obtains current imaging slice.The radio-frequency field distribution data of position and the magnetic resonance equipment again based on current imaging slice are right
The radio frequency waveform of this RF excited output is corrected, and enables to the radio-frequency field intensity and image reconstruction of current imaging slice
When expected radio-frequency field intensity be consistent, to improve the quality of image reconstruction and the imaging effect of MRI.
A kind of RF excited method provided based on the above embodiment, the embodiment of the present application also provides a kind of computers can
Storage medium is read, computer program is stored thereon with, when the computer program is executed by processor, realizes such as above-described embodiment
Any one in the RF excited method of offer.
A kind of RF excited method and device provided based on the above embodiment, the embodiment of the present application also provides a kind of magnetic
Resonant device, the equipment include: processor and memory；
Memory is transferred to processor for storing program code, and by program code；
Processor, for executing as in RF excited method provided by the above embodiment according to the instruction in program code
Any one.
It should be noted that each embodiment in this specification is described in a progressive manner, each embodiment emphasis is said
Bright is the difference from other embodiments, and the same or similar parts in each embodiment may refer to each other.For reality
For applying system or device disclosed in example, since it is corresponded to the methods disclosed in the examples, so description is fairly simple, it is related
Place is referring to method part illustration.
It should also be noted that, herein, relational terms such as first and second and the like are used merely to one
Entity or operation are distinguished with another entity or operation, without necessarily requiring or implying between these entities or operation
There are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to contain
Lid non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
The step of method described in conjunction with the examples disclosed in this document or algorithm, can directly be held with hardware, processor
The combination of capable software module or the two is implemented.Software module can be placed in random access memory (RAM), memory, read-only deposit
Reservoir (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology
In any other form of storage medium well known in field.
The above is only the preferred embodiment of the application, not makes any form of restriction to the application.Though
Right the application has been disclosed in a preferred embodiment above, however is not limited to the application.It is any to be familiar with those skilled in the art
Member, in the case where not departing from technical scheme ambit, all using the methods and technical content of the disclosure above to the application
Technical solution makes many possible changes and modifications or equivalent example modified to equivalent change.Therefore, it is all without departing from
The content of technical scheme, any simple modification made to the above embodiment of the technical spirit of foundation the application are equal
Variation and modification, still fall within technical scheme protection in the range of.
Claims (12)
1. a kind of RF excited method, which is characterized in that the described method includes:
The radio-frequency field distribution data of magnetic resonance equipment are obtained in advance；The radio-frequency field distribution data include in the magnetic resonance equipment
The corresponding radio-frequency field intensity in multiple sampling locations；
In each RF excited, the current imaging slice of this RF excited is obtained；
Position and the radio-frequency field distribution data based on the current imaging slice, to the rf wave of this RF excited output
Shape is corrected；
Radio frequency waveform after output calibration, to realize this RF excited.
2. the method according to claim 1, wherein the position based on the current imaging slice and described
Radio-frequency field distribution data are corrected the radio frequency waveform of this RF excited output, specifically include:
According to the position of the radio-frequency field distribution data and imaging slice, the corresponding correction system of each imaging slice is obtained
Number；
Determine that the corresponding correction of the current imaging slice is from the obtained corresponding correction coefficient of each imaging slice
Number；
Using the corresponding correction coefficient of the current imaging slice, the radio frequency waveform of this RF excited output is corrected.
3. according to the method described in claim 2, it is characterized in that, described according to the radio-frequency field distribution data and imaging slice
Position, determine the corresponding correction coefficient of each imaging slice, specifically include:
According to the position of the radio-frequency field distribution data and imaging slice, the corresponding radio field intensity of each imaging slice is obtained
Degree；
Obtain the ratio of default radio-frequency field intensity and the corresponding radio-frequency field intensity of the imaging slice as it is described it is each it is described at
The corresponding correction coefficient of photo layer.
4. method according to claim 1-3, which is characterized in that the radio frequency to the output of this RF excited
Waveform is corrected, and is specifically included:
The amplitude and/or phase of the radio frequency waveform are corrected.
5. the method according to claim 1, wherein the radiofrequency field for obtaining the magnetic resonance equipment in advance point
Cloth data, specifically include:
Radio-frequency field distribution emulation or test are carried out to the magnetic resonance equipment using default medium, obtain the radio-frequency field distribution number
According to；
Alternatively,
It carries out RF excited test in advance when patient is on the hospital bed of the magnetic resonance equipment, obtains radiofrequency field cycle tests；
The radio-frequency field distribution data are obtained based on the radiofrequency field cycle tests.
6. a kind of RF excited device, which is characterized in that described device includes: radiofrequency field acquiring unit, lamella acquiring unit, school
Positive unit and output unit；
The radiofrequency field acquiring unit, for obtaining the radio-frequency field distribution data of magnetic resonance equipment in advance；The radio-frequency field distribution
Data include the corresponding radio-frequency field intensity in multiple sampling locations in the magnetic resonance equipment；
The lamella acquiring unit, for obtaining the current imaging slice of this RF excited in each RF excited；
The correction unit, for based on the current imaging slice position and the radio-frequency field distribution data, this is penetrated
The radio frequency waveform of frequency excitation output is corrected；
The output unit, for the radio frequency waveform after output calibration, to realize this RF excited.
7. device according to claim 6, which is characterized in that the correction unit specifically includes: it is single that coefficient obtains son
Member, coefficient determine subelement and waveform correction subelement；
The coefficient obtains subelement and obtains each institute for the position according to the radio-frequency field distribution data and imaging slice
State the corresponding correction coefficient of imaging slice；
The coefficient determines subelement, for working as described in determining from the obtained corresponding correction coefficient of each imaging slice
The corresponding correction coefficient of preceding imaging slice；
The waveform correction subelement, for utilizing the corresponding correction coefficient of the current imaging slice, to this RF excited
The radio frequency waveform of output is corrected.
8. device according to claim 7, which is characterized in that the coefficient obtains subelement, specifically includes: intensity obtains
Subelement and ratio computation subunit；
The intensity obtains subelement and obtains each institute for the position according to the radio-frequency field distribution data and imaging slice
State the corresponding radio-frequency field intensity of imaging slice；
The ratio computation subunit, for obtaining default radio-frequency field intensity and the corresponding radio-frequency field intensity of the imaging slice
Ratio is as the corresponding correction coefficient of each imaging slice.
9. according to the described in any item devices of claim 6-8, which is characterized in that the correction unit is specifically used for described
The amplitude and/or phase of radio frequency waveform are corrected.
10. device according to claim 6, which is characterized in that the radiofrequency field acquiring unit specifically includes: first obtains
Take subelement or the second acquisition subelement；
Described first obtains subelement, for carrying out radio-frequency field distribution emulation or survey to the magnetic resonance equipment using default medium
Examination, obtains the radio-frequency field distribution data；
Described second obtains subelement, for carrying out RF excited survey in advance when patient is on the hospital bed of the magnetic resonance equipment
Examination, obtains radiofrequency field cycle tests；The radio-frequency field distribution data are obtained based on the radiofrequency field cycle tests.
11. a kind of computer readable storage medium, which is characterized in that computer program is stored thereon with, when the computer program
When being executed by processor, the RF excited method as described in claim 1-5 any one is realized.
12. a kind of magnetic resonance equipment characterized by comprising processor and memory；
The memory is transferred to the processor for storing program code, and by said program code；
The processor, for executing penetrating as described in claim 1-5 any one according to the instruction in said program code
Frequency motivational techniques.
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