CN109620228A - Fatty zero deviation bearing calibration and MR imaging method in magnetic resonance imaging - Google Patents
Fatty zero deviation bearing calibration and MR imaging method in magnetic resonance imaging Download PDFInfo
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Abstract
This application involves zero deviation bearing calibration fatty in a kind of magnetic resonance imaging and MR imaging methods.Method includes: the fatty dead-center position of theory obtained in the case that transverse magnetic swears complete dephasing；Emulate to obtain the emulation fat dead-center position under actual conditions using phase diagram is expanded；It obtains theoretical fatty dead-center position and emulates the deviation between fatty dead-center position, and obtain departure look-up table；It is corrected based on the fatty dead-center position of theory of the departure look-up table to different physical feelings.Fatty zero deviation bearing calibration, MR imaging method and computer equipment make doctor when carrying out pressure rouge for different physical feelings in above-mentioned magnetic resonance imaging, corresponding deviation can be found to be corrected with the fatty dead-center position of theory to different physical feelings, make fatty dead-center position closer to actual conditions, reaches preferably pressure rouge effect.
Description
Technical field
This application involves medical nuclear magnetic resonance imaging technical fields, inclined more particularly to zero point fatty in a kind of magnetic resonance imaging
Difference correcting method and MR imaging method.
Background technique
Fat-suppression technique in magnetic resonance clinical imaging, i.e. pressure rouge, are to utilize narrow frequency pulse independent excitation fat signal,
And the fat signal after excitation is broken up and then is executed conventional imaging sequence using gradient magnetic, due to fat signal
It by dephasing in advance, will test in conventional imaging sequential sampling less than fat signal, because referred to herein as " fat suppression ".
Pressure rouge is carried out, fatty dead-center position is needed to be grasped, and adjusts the acquisition order in the space K, makes fatty null-fill
In K space center position, best pressure rouge effect can be only achieved.But the calculating of fatty dead-center position is all based at present
The fatty dead-center position and reality that transverse magnetic is sweared the case where complete dephasing to derive, however is calculated in a manner of this derivation
Situation can have deviation, cause to press rouge effect poor.
Summary of the invention
Based on this, it is necessary to swear complete dephasing for transverse magnetic is all based on for the calculating of fatty dead-center position at present
Situation derives, however the fatty dead-center position and actual conditions that are calculated in a manner of this derivation can have deviation, lead
The poor technical problem of pressure rouge effect is caused, fatty zero deviation bearing calibration and magnetic resonance imaging in a kind of magnetic resonance imaging are provided
Method.
Fatty zero deviation bearing calibration, method include: in a kind of magnetic resonance imaging
Obtain the fatty dead-center position of theory in the case that transverse magnetic swears complete dephasing；
Emulate to obtain the emulation fat dead-center position under actual conditions using phase diagram is expanded；
It obtains theoretical fatty dead-center position and emulates the deviation between fatty dead-center position, and obtain departure look-up table,
Wherein, departure look-up table records the departure of different physical feelings；
It is corrected based on the fatty dead-center position of theory of the departure look-up table to different physical feelings.
The fatty dead-center position packet of theory in the case that transverse magnetic swears complete dephasing is obtained in one of the embodiments,
It includes:
Calculate steady-state value of the fat before pressing rouge pulse excitation；
Signal value of the fat before imaging pulse excitation is calculated based on steady-state value；
The fatty dead-center position in the case that transverse magnetic swears complete dephasing is calculated based on signal value.
Calculating steady-state value of the fat before pressing rouge pulse excitation in one of the embodiments, includes:
Based on initial magnetization vector, imaging pulse flip angle, pressure rouge pulse flip angle and adjacent pressure rouge pulse it
Between the number of imaging pulse calculate steady-state value of the fat before pressing rouge pulse excitation.
Calculating signal value of the fat before imaging pulse excitation based on steady-state value in one of the embodiments, includes:
Fat is calculated before imaging pulse excitation based on steady-state value, initial magnetization vector and pressure rouge pulse flip angle
Signal value.
The fatty zero point position in the case that transverse magnetic swears complete dephasing is calculated based on signal value in one of the embodiments,
It sets and includes:
Transverse magnetic arrow is calculated based on signal value, steady-state value, initial magnetization vector and pressure rouge pulse flip angle to dissipate completely
Fatty dead-center position in the case where phase.
In one of the embodiments, based on departure look-up table to the fatty dead-center positions of theory of different physical feelings into
Row corrects
Calculate the aimed aliphatic dead-center position in the case that transverse magnetic swears complete dephasing；
Corresponding target deviation amount is searched in departure look-up table according to the physical feeling of pressure rouge；
Aimed aliphatic dead-center position is corrected based on target deviation amount.
In one of the embodiments, based on departure look-up table to the fatty dead-center positions of theory of different physical feelings into
After row correction further include:
The acquisition order that the space K is adjusted by the method for loopy moving, the fatty null-fill after making correction is in the space K
Center.
A kind of MR imaging method, method include:
Determine the corresponding sweep parameter in position to be scanned；
Apply pressure rouge pulse and imaging pulse to scanned position respectively according to sweep parameter, and obtains the magnetic at position to be scanned
Resonance signal；
Fatty dead-center position after obtaining correction, is packed into K for magnetic resonance signal according to the fatty dead-center position after correction
Space obtains K space data；
K space data is rebuild, the pressure rouge image at position to be scanned is obtained；
Obtaining the fatty dead-center position after correcting includes:
Obtain the fatty dead-center position of theory in the case that transverse magnetic swears complete dephasing；
Emulate to obtain the emulation fat dead-center position under actual conditions using phase diagram is expanded；
It obtains theoretical fatty dead-center position and emulates the deviation between fatty dead-center position, and obtain departure look-up table,
Wherein, departure look-up table records the departure of different physical feelings；
It is corrected based on the fatty dead-center position of theory of the departure look-up table to different physical feelings, after being corrected
Fatty dead-center position.
Magnetic resonance signal is packed by the space K according to fatty dead-center position in one of the embodiments, obtains the space K
Data include:
According to the fill order of the fatty dead-center position adjustment magnetic resonance signal after correction, so that fatty dead-center position is corresponding
K space center.
A kind of computer equipment, including memory and processor, memory are stored with computer program, and processor executes meter
It is performed the steps of when calculation machine program
Obtain the fatty dead-center position of theory in the case that transverse magnetic swears complete dephasing；
Emulate to obtain the emulation fat dead-center position under actual conditions using phase diagram is expanded；
It obtains theoretical fatty dead-center position and emulates the deviation between fatty dead-center position, and obtain departure look-up table,
Wherein, departure look-up table records the departure of different physical feelings；
It is corrected based on the fatty dead-center position of theory of the departure look-up table to different physical feelings.
Fatty zero deviation bearing calibration, MR imaging method and computer equipment, pass through in above-mentioned magnetic resonance imaging
It obtains theoretical fatty dead-center position and emulates the deviation between fatty dead-center position, and record and obtain the deviation of different physical feelings
Look-up table is measured, then the corrected method of fatty dead-center position of different physical feelings is made to cure based on departure look-up table
Life can find corresponding deviation when carrying out pressure rouge for different physical feelings with the theoretical rouge to different physical feelings
Fat dead-center position is corrected, and makes fatty dead-center position closer to actual conditions, reaches preferably pressure rouge effect.
Detailed description of the invention
Fig. 1 is the flow diagram of fatty zero deviation bearing calibration in the magnetic resonance imaging of one embodiment of the invention；
Fig. 2 is that theoretical steady-state value and simulated steady state value radio frequency of the fat before pressing rouge pulse excitation disturb showing to angle variation
It is intended to；
Fig. 3 is fat dead-center position theoretical under long echo chain and emulates showing for fat dead-center position radio frequency pulse change
It is intended to；
Fig. 4 is the signal of theoretical fatty dead-center position and the fatty dead-center position radio frequency pulse change of emulation under short echo train
Figure；
Fig. 5 is the flow diagram of the MR imaging method of one embodiment of the invention；
Fig. 6 is the structural block diagram of fatty zero deviation means for correcting in the magnetic resonance imaging of one embodiment of the invention；
Fig. 7 is the structural block diagram of the MR imaging apparatus of one embodiment of the invention；
Fig. 8 is the internal structure chart of the computer equipment of one embodiment of the invention.
Specific embodiment
It is with reference to the accompanying drawings and embodiments, right in order to which the objects, technical solutions and advantages of the application are more clearly understood
The application is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the application, not
For limiting the application.
Referring to Fig. 1, Fig. 1 is the process of fatty zero deviation bearing calibration in the magnetic resonance imaging of one embodiment of the invention
Schematic diagram.
In the present embodiment, fatty zero deviation bearing calibration includes: in magnetic resonance imaging
Step 100, the fatty dead-center position of theory in the case that transverse magnetic swears complete dephasing is obtained.
In the present embodiment, the fatty dead-center position of theory obtained in the case that transverse magnetic swears complete dephasing includes calculating rouge
Steady-state value of the fat before pressing rouge pulse excitation；Signal value of the fat before imaging pulse excitation is calculated based on steady-state value；Based on letter
Number value calculates the fatty dead-center position in the case that transverse magnetic swears complete dephasing.
Illustratively, calculating steady-state value of the fat before pressing rouge pulse excitation includes based on initial magnetization vector, imaging arteries and veins
It rushes flip angle, pressure rouge pulse flip angle and the adjacent number for pressing imaging pulse between rouge pulse and calculates fat in pressure rouge arteries and veins
Steady-state value before impulse hair.Specifically, the formula of steady-state value of the fat before pressing rouge pulse excitation is calculated are as follows:
Wherein, Mze is steady-state value of the fat before pressing rouge pulse excitation, enables M0For initial magnetization vector, T is enabledfs1To press rouge
Pulse started to the duration of pressure rouge pulse center, enabled Tfs2For pressure rouge pulse center to press rouge end-of-pulsing duration,
Enabling α is imaging pulse flip angle, enables β for pressure rouge pulse flip angle, and n is of imaging pulse between adjacent pressure rouge pulse
Number, T1 is longitudinal relaxation time, and T2 is cross
To the relaxation time, TR is the repetition time.
Illustratively, calculating signal value of the fat before imaging pulse excitation based on steady-state value includes based on steady-state value, just
Beginning magnetization vector and pressure rouge pulse flip angle calculate signal value of the fat before imaging pulse excitation.Specifically, based on steady
State value calculates the formula of signal value of the fat before imaging pulse excitation are as follows:
Wherein, Mz (nTR-) it is signal value of the fat before imaging pulse excitation, Mze is fat before pressing rouge pulse excitation
Steady-state value, M0For initial magnetization vector, β is pressure rouge pulse flip angle, and θ is imaging flip angle, and n is adjacent pressure rouge pulse
Between imaging pulse number,T1 is longitudinal relaxation time, and T2 is lateral relaxation time,
TR is the repetition time.
Illustratively, the fatty dead-center position calculated based on signal value in the case that transverse magnetic swears complete dephasing includes being based on
In the case that signal value, steady-state value, initial magnetization vector and pressure rouge pulse flip angle calculating transverse magnetic swear complete dephasing
Fatty dead-center position.Specifically, signal value Mz (nTR of the fat before imaging pulse excitation is enabled-) it is 0, at this time according to signal value
The formula of the available fatty dead-center position of calculation formula are as follows:
Wherein, Mze is steady-state value of the fat before pressing rouge pulse excitation, M0For initial magnetization vector, β is that pressure rouge pulse is turned over
Gyration, θ are imaging flip angle, and n is the number of imaging pulse between adjacent pressure rouge pulse,T1 is longitudinal relaxation time, and T2 is lateral relaxation time, and TR is the repetition time.
Step 110, emulate to obtain the emulation fat dead-center position under actual conditions using expansion phase diagram.
It should be understood that the case where fatty dead-center position of theory in step 100 is based on transverse magnetic arrow complete dephasing come
It calculates, but actual conditions are more complicated, such as:
(1) signal is the result that spin echo, stimulated echo and gtadient echo constantly develop；
(2) signal is also water simultaneously and rouge is coefficient as a result, fatty have 7 peaks, is deposited between each fat peak and water
In different difference on the frequencies；
(3) radio frequency that GRE (Gradient Recalled Echo) presses rouge sequence different disturbs the steady-state value of phase angle signal not
Together.When radio frequency disturbs phase angle equal to 117 °, signal steady-state value and the steady-state value based on ideal model are (assuming that transverse magnetic arrow is complete
Dephasing) it is of substantially equal.
Therefore, fatty dead-center position in practical situations is different from theoretical fatty dead-center position.
Illustratively, it is obtained under actual conditions using EPG (Extended Phase Graph expands phase diagram) emulation
Emulate fatty dead-center position.
Fig. 2-Fig. 4 is please referred to, Fig. 2 is theoretical steady-state value and simulated steady state value radio frequency of the fat before pressing rouge pulse excitation
Disturb the schematic diagram changed to angle, in which: horizontal axis indicates that radio frequency is disturbed to angle；The longitudinal axis indicates corresponding steady-state value.Fig. 3 is in long echo
The schematic diagram of theoretical fat dead-center position and the fatty dead-center position radio frequency pulse change of emulation, horizontal axis indicate RF pulse-to-pulse under chain
Punching, the longitudinal axis indicate fatty dead-center position.Fig. 4 is theoretical fatty dead-center position and to emulate fatty dead-center position with penetrating under short echo train
The schematic diagram of frequency pulse change, horizontal axis indicate that radio-frequency pulse, the longitudinal axis indicate fatty dead-center position.Can as seen from the figure, due to
The complexity of actual conditions, there are a degree of deviations for the numerical value that the numerical value and emulation that theoretical calculation obtains obtain, if only
The fill order that K space center is only determined according to the fatty zero point that theoretical simulation is calculated, can exist between actual value
Deviation generates artifact so as to cause fatty zero migration.
Step 120, it obtains theoretical fatty dead-center position and emulates the deviation between fatty dead-center position, and obtain departure
Look-up table, wherein departure look-up table records the departure of different physical feelings.
Illustratively, the fatty dead-center position of theory of the different physical feelings obtained based on step 100 and step 110 and imitative
True fat dead-center position obtains the theoretical fatty dead-center position of different physical feelings and emulates the deviation between fatty dead-center position,
And departure look-up table is obtained, departure look-up table includes the corresponding relationship between physical feeling and departure, each body
The corresponding different departures in position.
Step 130, it is corrected based on the fatty dead-center position of theory of the departure look-up table to different physical feelings.
Illustratively, based on theory fatty dead-center position of the departure look-up table to different physical feelings be corrected including
Calculate the aimed aliphatic dead-center position in the case that transverse magnetic swears complete dephasing；It is searched according to the physical feeling of pressure rouge in departure
Corresponding target deviation amount is searched in table；Aimed aliphatic dead-center position is corrected based on target deviation amount.Illustratively, will
Mobile 2~3 units of the fatty dead-center position forward direction of the theory that upper abdomen is calculated, the theoretical rouge that mammary gland position is calculated
Fat dead-center position negative sense moves 2~4 units, to obtain most preferably pressing rouge effect.
Specifically, after being corrected based on the fatty dead-center position of theory of the departure look-up table to different physical feelings also
The acquisition order that the space K is adjusted including the method by loopy moving, the fatty null-fill after making correction is in the center in the space K
Position, to obtain optimal pressure rouge effect.
Referring to Fig. 5, Fig. 5 is the flow diagram of the MR imaging method in one embodiment of the invention.
In the present embodiment, MR imaging method includes:
Step 500, the corresponding sweep parameter in position to be scanned is determined.
Illustratively, sweep parameter includes the magnetic resonance imagings parameter such as magnetic field strength, sequence type, scan position.
Step 510, pressure rouge pulse and imaging pulse are applied to scanned position respectively according to sweep parameter, and obtained to be scanned
The magnetic resonance signal at position.
Illustratively, pressure rouge pulse can be quickly pressure rouge GRE (Gradient Recalled Echo) 3D pulse train.
It should be understood that in other embodiments, pressure rouge pulse can be other types of pulse train, preferable pressure rouge need to be only played
Effect.
Step 520, the fatty dead-center position after correction is obtained, according to the fatty dead-center position after correction by magnetic resonance signal
It is packed into the space K, obtains K space data.
Illustratively, the fatty dead-center position after correction is obtained, is believed magnetic resonance according to the fatty dead-center position after correction
It number is packed into the space K, obtaining K space data includes that the acquisition order in the space echo interchain K is adjusted by the method for loopy moving,
To adjust the fill order of magnetic resonance signal, magnetic resonance signal is packed into the space K, the fatty null-fill after making correction is in K
The center in space obtains K space data.
Step 530, K space data is rebuild, the pressure rouge image at position to be scanned is obtained.
Illustratively, K space data is rebuild, the pressure rouge image for obtaining position to be scanned includes using Fourier inversion side
Method rebuilds K space data, to obtain the pressure rouge image at position to be scanned.
It should be understood that in the present embodiment, use in above-mentioned magnetic resonance imaging fatty zero deviation bearing calibration with
Fatty dead-center position after to correction.Specifically, the fatty dead-center position after obtaining correction includes having been sweared using acquisition transverse magnetic
The fatty dead-center position of theory in the case where full dephasing；Emulate to obtain the emulation fat zero under actual conditions using phase diagram is expanded
Point position；It obtains theoretical fatty dead-center position and emulates the deviation between fatty dead-center position, and obtain departure look-up table,
In, departure look-up table records the departure of different physical feelings；Based on departure look-up table to the theory of different physical feelings
The fatty corrected method of dead-center position is corrected fatty dead-center position, the fatty dead-center position after being corrected.
It should be understood that although each step in the flow chart of Fig. 1 and Fig. 5 is successively shown according to the instruction of arrow,
But these steps are not that the inevitable sequence according to arrow instruction successively executes.Unless expressly state otherwise herein, these
There is no stringent sequences to limit for the execution of step, these steps can execute in other order.Moreover, in Fig. 1 and Fig. 5
At least part step may include that perhaps these sub-steps of multiple stages or stage are not necessarily same to multiple sub-steps
One moment executed completion, but can execute at different times, and the execution in these sub-steps or stage sequence is also not necessarily
Be successively carry out, but can at least part of the sub-step or stage of other steps or other steps in turn or
Alternately execute.
In one embodiment, as shown in fig. 6, providing fatty zero deviation means for correcting in a kind of magnetic resonance imaging,
It include: that theoretical calculation module 600, emulation module 610, look-up table establish module 620 and correction module 630, in which:
Theoretical calculation module 600, for obtaining the fatty dead-center position of theory in the case that transverse magnetic swears complete dephasing.
Theoretical calculation module 600, is also used to:
Calculate steady-state value of the fat before pressing rouge pulse excitation；
Signal value of the fat before imaging pulse excitation is calculated based on steady-state value；
The fatty dead-center position in the case that transverse magnetic swears complete dephasing is calculated based on signal value.
Theoretical calculation module 600 is also used to based on initial magnetization vector, imaging pulse flip angle, pressure rouge pulse overturning
The number of imaging pulse calculates steady-state value of the fat before pressing rouge pulse excitation between angle and adjacent pressure rouge pulse.
Theoretical calculation module 600 is also used to calculate based on steady-state value, initial magnetization vector and pressure rouge pulse flip angle
Signal value of the fat before imaging pulse excitation.
Theoretical calculation module 600 is also used to based on signal value, steady-state value, initial magnetization vector and pressure rouge pulse overturning
Angle calculation transverse magnetic swears the fatty dead-center position in the case where complete dephasing.
Emulation module 610, for emulating to obtain the emulation fat dead-center position under actual conditions using expansion phase diagram.
Look-up table establishes module 620, for obtaining theoretical fatty dead-center position and emulating inclined between fatty dead-center position
Difference, and obtain departure look-up table, wherein departure look-up table records the departure of different physical feelings.
Correction module 630, for being corrected based on fatty dead-center position of the departure look-up table to different physical feelings.
Correction module 630, is also used to: calculating the aimed aliphatic dead-center position in the case that transverse magnetic swears complete dephasing；
Corresponding target deviation amount is searched in departure look-up table according to the physical feeling of pressure rouge；
Aimed aliphatic dead-center position is corrected based on target deviation amount.
In one embodiment, as shown in fig. 7, providing a kind of MR imaging apparatus, comprising: sweep parameter determines mould
Block 700, magnetic resonance signal obtain module 710, K space data obtains module 720 and image reconstruction module 730, in which:
Sweep parameter determining module 700, for determining the corresponding sweep parameter in position to be scanned.
Magnetic resonance signal obtain module 710, for according to sweep parameter respectively to scanned position apply pressure rouge pulse and at
As pulse, and obtain the magnetic resonance signal at position to be scanned.
K space data obtains module 720, the fatty dead-center position after obtaining correction, according to the fatty zero point position after correction
It sets and magnetic resonance signal is packed into the space K, obtain K space data.
Image reconstruction module 730 obtains the pressure rouge image at position to be scanned for rebuilding K space data.
Specific restriction about zero deviation means for correcting fatty in magnetic resonance imaging and MR imaging apparatus can be joined
It sees above for zero deviation bearing calibration fatty in magnetic resonance imaging and the restriction of MR imaging method, it is no longer superfluous herein
It states.Modules in above-mentioned magnetic resonance imaging in fatty zero deviation means for correcting and MR imaging apparatus can whole or portion
Divide and is realized by software, hardware and combinations thereof.Above-mentioned each module can be embedded in the form of hardware or independently of computer equipment
In processor in, can also be stored in a software form in the memory in computer equipment, in order to processor calling hold
The corresponding operation of the above modules of row.
In one embodiment, a kind of computer equipment is provided, which can be terminal, internal structure
Figure can be as shown in Figure 8.The computer equipment includes processor, the memory, network interface, display connected by system bus
Screen and input unit.Wherein, the processor of the computer equipment is for providing calculating and control ability.The computer equipment is deposited
Reservoir includes non-volatile memory medium, built-in storage.The non-volatile memory medium is stored with operating system and computer journey
Sequence.The built-in storage provides environment for the operation of operating system and computer program in non-volatile memory medium.The calculating
The network interface of machine equipment is used to communicate with external terminal by network connection.When the computer program is executed by processor with
Realize fatty zero deviation bearing calibration and MR imaging method in a kind of magnetic resonance imaging.The display screen of the computer equipment
It can be liquid crystal display or electric ink display screen, the input unit of the computer equipment can be to be covered on display screen
Touch layer is also possible to the key being arranged on computer equipment shell, trace ball or Trackpad, can also be external keyboard,
Trackpad or mouse etc..
It will be understood by those skilled in the art that structure shown in Fig. 8, only part relevant to application scheme is tied
The block diagram of structure does not constitute the restriction for the computer equipment being applied thereon to application scheme, specific computer equipment
It may include perhaps combining certain components or with different component layouts than more or fewer components as shown in the figure.
In one embodiment, a kind of computer equipment, including memory and processor are provided, is stored in memory
Computer program, the processor perform the steps of when executing computer program
Obtain the fatty dead-center position of theory in the case that transverse magnetic swears complete dephasing；
Emulate to obtain the emulation fat dead-center position under actual conditions using phase diagram is expanded；
It obtains theoretical fatty dead-center position and emulates the deviation between fatty dead-center position, and obtain departure look-up table,
Wherein, departure look-up table records the departure of different physical feelings；
It is corrected based on the fatty dead-center position of theory of the departure look-up table to different physical feelings.
In one embodiment, it is also performed the steps of when processor executes computer program
Calculate steady-state value of the fat before pressing rouge pulse excitation；
Signal value of the fat before imaging pulse excitation is calculated based on steady-state value；
The fatty dead-center position in the case that transverse magnetic swears complete dephasing is calculated based on signal value.
In one embodiment, it is also performed the steps of when processor executes computer program
Based on initial magnetization vector, imaging pulse flip angle, pressure rouge pulse flip angle and adjacent pressure rouge pulse it
Between the number of imaging pulse calculate steady-state value of the fat before pressing rouge pulse excitation.
In one embodiment, it is also performed the steps of when processor executes computer program
Fat is calculated before imaging pulse excitation based on steady-state value, initial magnetization vector and pressure rouge pulse flip angle
Signal value.
In one embodiment, it is also performed the steps of when processor executes computer program
Transverse magnetic arrow is calculated based on signal value, steady-state value, initial magnetization vector and pressure rouge pulse flip angle to dissipate completely
Fatty dead-center position in the case where phase.
In one embodiment, it is also performed the steps of when processor executes computer program
Calculate the aimed aliphatic dead-center position in the case that transverse magnetic swears complete dephasing；
Corresponding target deviation amount is searched in departure look-up table according to the physical feeling of pressure rouge；
Aimed aliphatic dead-center position is corrected based on target deviation amount.
In one embodiment, it is also performed the steps of when processor executes computer program
The acquisition order that the space K is adjusted by the method for loopy moving, the fatty null-fill after making correction is in the space K
Center.
In one embodiment, it is also performed the steps of when processor executes computer program
Determine the corresponding sweep parameter in position to be scanned；
Apply pressure rouge pulse and imaging pulse to scanned position respectively according to sweep parameter, and obtains the magnetic at position to be scanned
Resonance signal；
Fatty dead-center position after obtaining correction, is packed into K for magnetic resonance signal according to the fatty dead-center position after correction
Space obtains K space data；
K space data is rebuild, the pressure rouge image at position to be scanned is obtained；
Obtaining the fatty dead-center position after correcting includes:
Obtain the fatty dead-center position of theory in the case that transverse magnetic swears complete dephasing；
Emulate to obtain the emulation fat dead-center position under actual conditions using phase diagram is expanded；
It obtains theoretical fatty dead-center position and emulates the deviation between fatty dead-center position, and obtain departure look-up table,
Wherein, departure look-up table records the departure of different physical feelings；
It is corrected based on the fatty dead-center position of theory of the departure look-up table to different physical feelings, after being corrected
Fatty dead-center position.In one embodiment, it is also performed the steps of when processor executes computer program
The fill order of magnetic resonance signal is adjusted according to fatty dead-center position, so that fatty dead-center position corresponds in the space K
The heart.
In one embodiment, a kind of computer readable storage medium is provided, computer program is stored thereon with, is calculated
Machine program performs the steps of when being executed by processor
Obtain the fatty dead-center position of theory in the case that transverse magnetic swears complete dephasing；
Emulate to obtain the emulation fat dead-center position under actual conditions using phase diagram is expanded；
It obtains theoretical fatty dead-center position and emulates the deviation between fatty dead-center position, and obtain departure look-up table,
Wherein, departure look-up table records the departure of different physical feelings；
It is corrected based on the fatty dead-center position of theory of the departure look-up table to different physical feelings.
In one embodiment, it is also performed the steps of when computer program is executed by processor
Calculate steady-state value of the fat before pressing rouge pulse excitation；
Signal value of the fat before imaging pulse excitation is calculated based on steady-state value；
The fatty dead-center position in the case that transverse magnetic swears complete dephasing is calculated based on signal value.
In one embodiment, it is also performed the steps of when computer program is executed by processor
Based on initial magnetization vector, imaging pulse flip angle, pressure rouge pulse flip angle and adjacent pressure rouge pulse it
Between the number of imaging pulse calculate steady-state value of the fat before pressing rouge pulse excitation.
In one embodiment, it is also performed the steps of when computer program is executed by processor
Fat is calculated before imaging pulse excitation based on steady-state value, initial magnetization vector and pressure rouge pulse flip angle
Signal value.
In one embodiment, it is also performed the steps of when computer program is executed by processor
Transverse magnetic arrow is calculated based on signal value, steady-state value, initial magnetization vector and pressure rouge pulse flip angle to dissipate completely
Fatty dead-center position in the case where phase.
In one embodiment, it is also performed the steps of when computer program is executed by processor
Calculate the aimed aliphatic dead-center position in the case that transverse magnetic swears complete dephasing；
Corresponding target deviation amount is searched in departure look-up table according to the physical feeling of pressure rouge；
Aimed aliphatic dead-center position is corrected based on target deviation amount.
In one embodiment, it is also performed the steps of when computer program is executed by processor
The acquisition order that the space K is adjusted by the method for loopy moving, the fatty null-fill after making correction is in the space K
Center.
In one embodiment, it is also performed the steps of when computer program is executed by processor
Determine the corresponding sweep parameter in position to be scanned；
Apply pressure rouge pulse and imaging pulse to scanned position respectively according to sweep parameter, and obtains the magnetic at position to be scanned
Resonance signal；
Fatty dead-center position after obtaining correction, is packed into K for magnetic resonance signal according to the fatty dead-center position after correction
Space obtains K space data；
K space data is rebuild, the pressure rouge image at position to be scanned is obtained；
Obtaining the fatty dead-center position after correcting includes:
Obtain the fatty dead-center position of theory in the case that transverse magnetic swears complete dephasing；
Emulate to obtain the emulation fat dead-center position under actual conditions using phase diagram is expanded；
It obtains theoretical fatty dead-center position and emulates the deviation between fatty dead-center position, and obtain departure look-up table,
Wherein, departure look-up table records the departure of different physical feelings；
It is corrected based on the fatty dead-center position of theory of the departure look-up table to different physical feelings, after being corrected
Fatty dead-center position.
In one embodiment, it is also performed the steps of when computer program is executed by processor
The fill order of magnetic resonance signal is adjusted according to fatty dead-center position, so that fatty dead-center position corresponds in the space K
The heart.
Fatty zero deviation bearing calibration, MR imaging method and computer equipment, pass through in above-mentioned magnetic resonance imaging
It obtains theoretical fatty dead-center position and emulates the deviation between fatty dead-center position, and record and obtain the deviation of different physical feelings
Look-up table is measured, then the corrected method of fatty dead-center position of different physical feelings is made to cure based on departure look-up table
Life can find corresponding deviation when carrying out pressure rouge for different physical feelings with the theoretical rouge to different physical feelings
Fat dead-center position is corrected, and makes fatty dead-center position closer to actual conditions, reaches preferably pressure rouge effect.
Those of ordinary skill in the art will appreciate that realizing all or part of the process in above-described embodiment method, being can be with
Instruct relevant hardware to complete by computer program, computer program to can be stored in a non-volatile computer readable
It takes in storage medium, the computer program is when being executed, it may include such as the process of the embodiment of above-mentioned each method.Wherein, this Shen
Please provided by any reference used in each embodiment to memory, storage, database or other media, may each comprise
Non-volatile and/or volatile memory.Nonvolatile memory may include read-only memory (ROM), programming ROM
(PROM), electrically programmable ROM (EPROM), electrically erasable ROM (EEPROM) or flash memory.Volatile memory may include
Random access memory (RAM) or external cache.By way of illustration and not limitation, RAM is available in many forms,
Such as static state RAM (SRAM), dynamic ram (DRAM), synchronous dram (SDRAM), double data rate sdram (DDRSDRAM), enhancing
Type SDRAM (ESDRAM), synchronization link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM
(RDRAM), direct memory bus dynamic ram (DRDRAM) and memory bus dynamic ram (RDRAM) etc..
Each technical characteristic of above embodiments can be combined arbitrarily, for simplicity of description, not to above-described embodiment
In each technical characteristic it is all possible combination be all described, as long as however, the combination of these technical characteristics be not present lance
Shield all should be considered as described in this specification.
Above embodiments only express the several embodiments of the application, and the description thereof is more specific and detailed, but can not
Therefore it is construed as limiting the scope of the patent.It should be pointed out that for those of ordinary skill in the art,
Under the premise of not departing from the application design, various modifications and improvements can be made, these belong to the protection scope of the application.
Therefore, the scope of protection shall be subject to the appended claims for the application patent.
Claims (10)
1. fatty zero deviation bearing calibration in a kind of magnetic resonance imaging, for correcting the fatty dead-center position in fast ram compression rouge,
It is characterized in that, which comprises
Obtain the fatty dead-center position of theory in the case that transverse magnetic swears complete dephasing；
Emulate to obtain the emulation fat dead-center position under actual conditions using phase diagram is expanded；
It obtains theoretical fatty dead-center position and emulates the deviation between fatty dead-center position, and obtain departure look-up table, wherein
The departure look-up table records the departure of different physical feelings；
It is corrected based on the fatty dead-center position of theory of the departure look-up table to different physical feelings.
2. the method according to claim 1, wherein the reason obtained in the case that transverse magnetic swears complete dephasing
Include: by fatty dead-center position
Calculate steady-state value of the fat before pressing rouge pulse excitation；
Signal value of the fat before imaging pulse excitation is calculated based on the steady-state value；
The fatty dead-center position in the case that transverse magnetic swears complete dephasing is calculated based on the signal value.
3. according to the method described in claim 2, it is characterized in that, the steady-state value for calculating fat before pressing rouge pulse excitation
Include:
Based on initial magnetization vector, imaging pulse flip angle, pressure rouge pulse flip angle and adjacent pressure rouge pulse between at
As the number of pulse calculates steady-state value of the fat before pressing rouge pulse excitation.
4. according to the method described in claim 2, it is characterized in that, described calculate fat in imaging pulse based on the steady-state value
Signal value before excitation includes:
Fat is calculated before imaging pulse excitation based on the steady-state value, initial magnetization vector and pressure rouge pulse flip angle
Signal value.
5. according to the method described in claim 2, it is characterized in that, described dissipated completely based on signal value calculating transverse magnetic arrow
Fatty dead-center position in the case where phase includes:
Transverse magnetic is calculated based on the signal value, the steady-state value, initial magnetization vector and pressure rouge pulse flip angle to have sweared
Fatty dead-center position in the case where full dephasing.
6. the method according to claim 1, wherein described be based on the departure look-up table to different body
The fatty dead-center position of the theory of position, which is corrected, includes:
Calculate the aimed aliphatic dead-center position in the case that transverse magnetic swears complete dephasing；
Corresponding target deviation amount is searched in the departure look-up table according to the physical feeling of pressure rouge；
The aimed aliphatic dead-center position is corrected based on the target deviation amount.
7. the method according to claim 1, wherein described be based on the departure look-up table to different body
After the fatty dead-center position of the theory of position is corrected further include:
The acquisition order that the space K is adjusted by the method for loopy moving, the fatty null-fill after making correction is in the center in the space K
Position.
8. a kind of MR imaging method characterized by comprising
Determine the corresponding sweep parameter in position to be scanned；
Apply pressure rouge pulse and imaging pulse to the scanned position respectively according to the sweep parameter, and obtains described to be scanned
The magnetic resonance signal at position；
Fatty dead-center position after obtaining correction, is packed into K for the magnetic resonance signal according to the fatty dead-center position after correction
Space obtains K space data；
The K space data is rebuild, the pressure rouge image at position to be scanned is obtained；
It is described obtain correction after fatty dead-center position include:
Obtain the fatty dead-center position of theory in the case that transverse magnetic swears complete dephasing；
Emulate to obtain the emulation fat dead-center position under actual conditions using phase diagram is expanded；
It obtains theoretical fatty dead-center position and emulates the deviation between fatty dead-center position, and obtain departure look-up table, wherein
The departure look-up table records the departure of different physical feelings；
It is corrected based on the fatty dead-center position of theory of the departure look-up table to different physical feelings, after being corrected
Fatty dead-center position.
9. MR imaging method according to claim 8, which is characterized in that it is described will be described according to fatty dead-center position
Magnetic resonance signal is packed into the space K, obtains K space data and includes:
The fill order of the magnetic resonance signal is adjusted according to the fatty dead-center position after the correction, so that the fat zero point
Position corresponds to the K space center.
10. a kind of computer equipment, including memory and processor, the memory are stored with computer program, feature exists
In the step of processor realizes any one of claims 1 to 9 the method when executing the computer program.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110940943A (en) * | 2019-12-06 | 2020-03-31 | 上海联影医疗科技有限公司 | Training method of pulsation artifact correction model and pulsation artifact correction method |
| CN112948747A (en) * | 2021-02-05 | 2021-06-11 | 深圳市贝斯达医疗股份有限公司 | Method, device, terminal equipment and storage medium for searching center frequency |
| CN113970716A (en) * | 2021-10-18 | 2022-01-25 | 上海联影医疗科技股份有限公司 | Gradient echo sequence fat pressing method and magnetic resonance imaging method and equipment |
Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5270652A (en) * | 1992-05-20 | 1993-12-14 | North American Philips Corporation | MR method and apparatus employing magnetization transfer contrast inducing fat-selective RF pulse |
| US20040032977A1 (en) * | 2002-08-15 | 2004-02-19 | Daniel Blezek | Fat/water separation and fat minimization magnetic resonance imaging systems and methods |
| US20050070785A1 (en) * | 2003-09-25 | 2005-03-31 | Ahluwalia Baldev S. | Method and apparatus of gradient echo imaging with on-the-fly optimization of tissue suppression |
| US20080081986A1 (en) * | 2006-09-29 | 2008-04-03 | General Electric Company | Method and apparatus for generating a magnetic resonance image |
| CN101396265A (en) * | 2007-09-28 | 2009-04-01 | 株式会社东芝 | Magnetic resonance imaging apparatus and analysis method for fat suppression effect in magnetic resonance imaging apparatus |
| CN101401723A (en) * | 2007-10-04 | 2009-04-08 | 株式会社东芝 | MRI apparatus |
| US7706855B1 (en) * | 2004-07-20 | 2010-04-27 | General Electric Company | System and method for MR data acquisition with uniform fat suppression |
| US20100123460A1 (en) * | 2008-11-14 | 2010-05-20 | Timothy Hughes | Magnetic resonance tomography method and apparatus with separation of fat and water images according to the two-point dixon method dependent on t*2 decay |
| JP2011000232A (en) * | 2009-06-17 | 2011-01-06 | Toshiba Corp | Image processor, magnetic resonance imaging apparatus and image management system |
| CN102772206A (en) * | 2011-05-12 | 2012-11-14 | 上海联影医疗科技有限公司 | Magnetic resonance imaging method |
| CN103202693A (en) * | 2012-01-13 | 2013-07-17 | 株式会社东芝 | Magnetic resonance imaging apparatus |
| CN103654779A (en) * | 2012-09-26 | 2014-03-26 | 西门子(深圳)磁共振有限公司 | Magnetic resonance imaging method and device |
| CN103728580A (en) * | 2012-10-10 | 2014-04-16 | 西门子公司 | Method for recording image with magnetic resonance device and magnetic resonance device |
| JP2015016009A (en) * | 2013-07-09 | 2015-01-29 | 株式会社東芝 | Magnetic resonance imaging apparatus |
| CN105929350A (en) * | 2016-05-05 | 2016-09-07 | 大连锐谱科技有限责任公司 | Single-excitation fat-water separation imaging error correction system and method |
| CN106466182A (en) * | 2015-08-18 | 2017-03-01 | 上海联影医疗科技有限公司 | MR imaging method and system |
| US20170315198A1 (en) * | 2016-04-29 | 2017-11-02 | The Chinese University Of Hong Kong | Quantitative magnetic resonance imaging relaxometry with suppression of blood signal |
| CN108363026A (en) * | 2018-03-05 | 2018-08-03 | 奥泰医疗系统有限责任公司 | A kind of black blood MR imaging method of fat compacting |
-
2018
- 2018-12-20 CN CN201811563710.XA patent/CN109620228B/en active Active
Patent Citations (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5270652A (en) * | 1992-05-20 | 1993-12-14 | North American Philips Corporation | MR method and apparatus employing magnetization transfer contrast inducing fat-selective RF pulse |
| US20040032977A1 (en) * | 2002-08-15 | 2004-02-19 | Daniel Blezek | Fat/water separation and fat minimization magnetic resonance imaging systems and methods |
| US20050070785A1 (en) * | 2003-09-25 | 2005-03-31 | Ahluwalia Baldev S. | Method and apparatus of gradient echo imaging with on-the-fly optimization of tissue suppression |
| US7706855B1 (en) * | 2004-07-20 | 2010-04-27 | General Electric Company | System and method for MR data acquisition with uniform fat suppression |
| US20080081986A1 (en) * | 2006-09-29 | 2008-04-03 | General Electric Company | Method and apparatus for generating a magnetic resonance image |
| CN101396265A (en) * | 2007-09-28 | 2009-04-01 | 株式会社东芝 | Magnetic resonance imaging apparatus and analysis method for fat suppression effect in magnetic resonance imaging apparatus |
| US20090085566A1 (en) * | 2007-09-28 | 2009-04-02 | Kabushiki Kaisha Toshiba | Magnetic resonance imaging apparatus and analysis method for fat suppression effect in magnetic resonance imaging apparatus |
| CN101401723A (en) * | 2007-10-04 | 2009-04-08 | 株式会社东芝 | MRI apparatus |
| US20100123460A1 (en) * | 2008-11-14 | 2010-05-20 | Timothy Hughes | Magnetic resonance tomography method and apparatus with separation of fat and water images according to the two-point dixon method dependent on t*2 decay |
| JP2011000232A (en) * | 2009-06-17 | 2011-01-06 | Toshiba Corp | Image processor, magnetic resonance imaging apparatus and image management system |
| CN102772206A (en) * | 2011-05-12 | 2012-11-14 | 上海联影医疗科技有限公司 | Magnetic resonance imaging method |
| CN103202693A (en) * | 2012-01-13 | 2013-07-17 | 株式会社东芝 | Magnetic resonance imaging apparatus |
| CN103654779A (en) * | 2012-09-26 | 2014-03-26 | 西门子(深圳)磁共振有限公司 | Magnetic resonance imaging method and device |
| US20140084922A1 (en) * | 2012-09-26 | 2014-03-27 | Cai Xia Fu | Method and apparatus for magnetic resonance imaging |
| CN103728580A (en) * | 2012-10-10 | 2014-04-16 | 西门子公司 | Method for recording image with magnetic resonance device and magnetic resonance device |
| JP2015016009A (en) * | 2013-07-09 | 2015-01-29 | 株式会社東芝 | Magnetic resonance imaging apparatus |
| CN106466182A (en) * | 2015-08-18 | 2017-03-01 | 上海联影医疗科技有限公司 | MR imaging method and system |
| US20170315198A1 (en) * | 2016-04-29 | 2017-11-02 | The Chinese University Of Hong Kong | Quantitative magnetic resonance imaging relaxometry with suppression of blood signal |
| CN105929350A (en) * | 2016-05-05 | 2016-09-07 | 大连锐谱科技有限责任公司 | Single-excitation fat-water separation imaging error correction system and method |
| CN108363026A (en) * | 2018-03-05 | 2018-08-03 | 奥泰医疗系统有限责任公司 | A kind of black blood MR imaging method of fat compacting |
Non-Patent Citations (3)
| Title |
|---|
| 倪萍等: "《医用磁共振成像设备质量控制检测技术》", 30 September 2016, 中国质检出版社 * |
| 刘锦文等: "国产低场强磁共振设备脂肪抑制技术的应用研究", 《中华放射学杂志》 * |
| 张卫萍等: "《MRI技术与实验》", 30 June 2018, 镇江：江苏大学出版社 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110940943A (en) * | 2019-12-06 | 2020-03-31 | 上海联影医疗科技有限公司 | Training method of pulsation artifact correction model and pulsation artifact correction method |
| CN110940943B (en) * | 2019-12-06 | 2021-11-02 | 上海联影医疗科技股份有限公司 | Training method of pulsation artifact correction model and pulsation artifact correction method |
| CN112948747A (en) * | 2021-02-05 | 2021-06-11 | 深圳市贝斯达医疗股份有限公司 | Method, device, terminal equipment and storage medium for searching center frequency |
| CN113970716A (en) * | 2021-10-18 | 2022-01-25 | 上海联影医疗科技股份有限公司 | Gradient echo sequence fat pressing method and magnetic resonance imaging method and equipment |
| CN113970716B (en) * | 2021-10-18 | 2024-04-23 | 上海联影医疗科技股份有限公司 | Gradient echo sequence fat pressing method and magnetic resonance imaging method and equipment |
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