CN101636664A - Magnetic resonance imaging system and method - Google Patents
Magnetic resonance imaging system and method Download PDFInfo
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- CN101636664A CN101636664A CN200880008608A CN200880008608A CN101636664A CN 101636664 A CN101636664 A CN 101636664A CN 200880008608 A CN200880008608 A CN 200880008608A CN 200880008608 A CN200880008608 A CN 200880008608A CN 101636664 A CN101636664 A CN 101636664A
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Abstract
The objective of the present invention to provide a MRI technique, in which the influence of physiological factors such as respiration and cardiac pulsation on MRI results is reduced or removed. The object of the present invention is achieved by a magnetic resonance imaging system (1), comprising a first RF coil (2) adapted for acquiring magnetic resonance imaging data of a patient s body; a number of measuring elements (5, 5', 5'', 29, 31), which are sensitive to a load changing of the first RF coil (2), said measuring elements (5, 5', 5'', 29, 31) being adapted for acquiring data related to motion of said patient s body; and a processing unit (9) adapted for employing said motion data to correct for patient motion in magnetic resonance imaging.
Description
Technical field
Present invention relates in general to non-invasive imaging and use, relate in particular to magnetic resonance imaging (MRI).More specifically, the present invention relates to a kind of employing radio frequency (RF) coil measures by the imaging technique of patient imaged health character.
Background technology
MRI measures the various magnetic properties of target material in the magnetic field.MRI is included in roughly and aligns by the nuclear spin of image forming material in the uniform magnetic field, and utilizes periodically RF pulse-type disturbance magnetic field, so that measure by the nuclear magnetic resonance of image forming material (NMR) phenomenon.In order to bring out the NMR phenomenon, one or more resonance coils are provided, coil with the resonance frequency of the Larmor frequency (being the speed of nucleon) of particular organization coupling around the axle precession on produce the RF pulse so that the excitation nucleon, make they along the direction of the RF pulse that is applied around the axle precession.When the RF pulse was disappeared, nucleon alignd with magnetic field once more, discharged measurable energy.
When resonance coil is placed on load, when for example wanting near the patient of imaging or other objects, the various attributes of resonance coil may be affected.In MRI, this load effect tends to by changing the coil resonance frequency and causing coil character that other general undesirable variations take place, and motion has a negative impact to device.This load effect partly depends on the dielectric properties of load.The variation of coil resonance frequency may the reducer excitation cause negative effect by the ability of image forming material nucleon (for example, owing to cause the mistake coupling between coil resonance frequency and target material Larmor frequency) and to the quality of gained image.The loaded effect of coil makes MRI complicated, usually wants tuning or regulates resonance coil to compensate by the general undesirable load effect that is caused by the imaging human body.
For tuning or adjusting resonance coil, from the extra little RF coil of the known employing resonance coil of prior art inside.The voltage of the local RF of resonance coil field is depended in the measurement of little RF coil, and this is subjected to the influence of health load effect.The induced voltage control of using little RF coil to measure is supplied to the phase place and the amplitude of the RF power of resonance coil.Under resonance RF coil for example comprises situation as a plurality of driven line coil elements of phased array, use this little RF coil to be particularly useful.In this case, can be fed to the amplitude and the phase place of the RF power of each body coil element by control, make when driving them at the same time, they are being realized RF field very uniformly by the imaging body interior.
Summary of the invention
The purpose of this invention is to provide a kind of high-quality MRI technology.Particularly, the purpose of this invention is to provide a kind of MRI technology, wherein, such as breathing and the physiologic factor of heartbeat is alleviated MRI result's influence or eliminates.
The objective of the invention is to realize that by a kind of magnetic resonance imaging system this magnetic resonance imaging system comprises: a RF coil, it is suitable for gathering the magnetic resonance imaging data of patient body; Some measuring sensors, it is to the load variations sensitivity of a described RF coil, and described measuring sensor is suitable for gathering the data relevant with the motion of described patient body; And processing unit, be suitable for adopting the patient moving in the described exercise data correction magnetic resonance imaging.
The load of (one or more) resonance coil is subjected to wanting the influence of the body kinematics of imaging.It for example is owing to breathe the motion or because the motion that heartbeat causes in the patient thoracic cavity that causes that health moves unintentionally.
This purpose realizes by a kind of MR imaging method according to the present invention that also this method comprises the steps: to gather by a RF coil magnetic resonance imaging data of patient body; By some measuring sensor collections data relevant with the motion of described patient body, described measuring sensor is to the load variations sensitivity of a described RF coil; And adopt described exercise data to come by the patient moving in the processing unit correction magnetic resonance imaging.
Purpose of the present invention also realizes by a kind of computer program, this computer program is used to carry out said method, and described program adopts described exercise data to proofread and correct the computer instruction of the patient moving in the magnetic resonance imaging by processing unit when being included in computer program in the computing machine.So can realize according to technique effect required for the present invention based on instruction according to computer program of the present invention.This computer program can be stored in such as maybe obtaining it on the carrier of CD-ROM or DVD by the Internet or another calculating meter network.Before carrying out, for example by cd-rom player or DVD player from carrier, thereby or read computer program from the Internet computer program be written into computing machine, and it is stored in the storer of computing machine.Computing machine comprises CPU (central processing unit) (CPU), bus system, memory device (for example, RAM or ROM etc.), memory storage (for example, floppy disk or hard disk unit etc.) and I/O unit.Alternatively, can utilize for example one or more integrated circuit that method of the present invention is embodied as hardware.
Core concept of the present invention provides a kind of technology, is used to alleviate or eliminate physiologic factor, for example with the heart movement of breathing relevant abdominal exercise or causing owing to heartbeat or both simultaneously to MRI result's influence.As a result, the present invention can for example compensate owing to the fluctuation between the image that is caused by the physiological activity of imaging object.For this purpose, determine patient's breathing phase and/or cardiac phase by the motion that during the MR imaging process, detects the patient.By the change in voltage of bringing out in the measuring sensor of measurement to the load variations sensitivity of a RF coil, determine the influence of the load of variation, thereby carry out motion detection (one or more) RF coil (or its coil part).
Because the pseudo-shadow that causes of physiological activity is well discerned, and developed various technology and alleviated them in the anatomy imaging.The most simple and clear mode is to make data acquisition and special exercise synchronous by gating or triggering.According to the present invention, next the understanding to patient respiratory phase and/or cardiac phase during the RF burst length is used for aloft, promptly revises the collection character (that is: the inclination angle of coding order, the ken, slice position, next pulse etc.) of formation method in the MRI data acquisition period.In other words, gather the MRI data simultaneously with RF transmission and with patient moving relevant data, and after RF transmits, revise the MRI sequence immediately.
According to a further aspect in the invention, the understanding of patient respiratory during the imaging and/or cardiac phase is allowed during data processing,, make imaging data and physiological activity synchronous retrospectively if promptly under the situation that the MRI data acquisition is finished.In this case, imaging data is arranged into retrospectively (for example, breathing and cardiac cycle) in the physiological period.Afterwards, eliminate physiological effect from the MRI data.In other words, according to this aspect of the present invention, monitoring person under inspection's physiological activity when gathering imaging data is estimated physiological effect then retrospectively and is eliminated according to the guidance of collection physiological data.
Compare with the method (promptly being banded in patient's chest mechanical corrugated tube (bellow) on every side) of existing consideration physiological activity, the major advantage of proposed invention is that it need not place extra equipment on one's body the patient.In addition, when moving the patient, can detect the motion except that breathing (or heart movement) by system.For example, if movable suddenly, will detect this situation, and can correspondingly compensate the MR data acquisition the scan period patient.In addition, the present invention is insensitive for the duration variation of every kind of physiological period (respiratory cycle, cardiac cycle etc.), and can use under various experiment conditions.
To these and other aspects of the present invention be described in more detail based on the defined following examples of dependent claims.
According to a preferred embodiment of the invention, measuring sensor is suitable for gathering patient's respiratory movement and/or heart movement.For this purpose, as measuring sensor, it is to the effect sensitivity of load to a RF coil or its element with RF pick-up winding (RF pickup coil).If a RF pick-up winding and a RF coil lean on very closely, can realize good susceptibility to load effect.If adopt such RF pick-up winding, just found the main source of kinematic error during MRI measures accurately.In other preferred embodiments of the present invention, do not use RF pick-up winding (or except using RF pick-up winding), the electric or electronic unit that can use directional coupler and/or have a predetermined electromagnetic property is as measuring sensor.
According to a preferred embodiment of the invention, a RF coil is a multicomponent RF coil.Utilize this RF coil, even also can be in the inner uniform RF field that obtains of patient body under the RF of higher frequency and raising intensity.If each RF coil part comprises its oneself measuring sensor, just can carry out motion detection by point-device mode.Alternatively, the quantity of measuring sensor is not equal to the quantity of RF coil part.Preferably, the quantity of measuring sensor is less than the quantity of RF coil part.When the patient moving that will measure was characterized by several degree of freedom, this was desirable.In this case, the measuring sensor of lesser amt has been realized the reduction of system complexity and cost.
According to another preferred embodiment of the invention, multicomponent RF coil is suitable for directly being positioned on one's body the patient, and can remove from the MRI system.In other words, not only can use fixing (system integration) volume RF coil, for example the RF coil of emission array form.On the contrary, can also use part (preferably dismountable) transmitting coil topology, for example the local transmit coil array.
If a RF coil is a quadrature birdcage coil, and measuring sensor is set, so also can uses the present invention with the level that detects a RF coil and the vertical load variations of (quadrature) mode of resonance.This mode can be used for existing MRI system as a kind of improvement.
Description of drawings
To describe these and other aspects of the present invention by way of example in detail with reference to following examples and accompanying drawing hereinafter, in the accompanying drawing:
Fig. 1 shows the synoptic diagram of MRI system;
Fig. 2 has provided the diagram that has schematically shown the different step of method of the present invention on time scale;
Fig. 3 shows the synoptic diagram of the multicomponent transmitting RF coil system that comprises pick-up winding;
Fig. 4 shows the schematic construction of the single passage of the RF coil system with pick-up winding;
Fig. 5 shows the schematic construction of the single passage of the RF coil system with coupling direction;
Fig. 6 shows and utilizes the directly schematic construction of the single passage of the RF coil system of measurement of capacitor.
Reference numeral
1.MRI system 20.RF pulse
2.RF coil 21. gradient sequences
3. coil part 22. is measured gradient
4. patient body 23. is prepared gradient (preparation gradient)
5. pick-up winding 24.MR sample areas
6. (free time) 25. pick-up winding sample areas
7. receiver 26. process modifier areas
8. (free time) 27. concentric cable
9. processing unit 28.RF amplifier
10. controller 29. directional couplers
30. reflective power port
31. capacitor
Embodiment
Simple embodiment of the present invention is described below.MRI system 1 comprises that to have a plurality of RF coil parts 3 (not shown among Fig. 1; Referring to Fig. 3) volume multicomponent transmission/reception (or even only send) RF coil 2.Particularly, MRI system 1 comprises at least two RF coil parts 3 that are suitable for gathering the magnetic resonance imaging data of patient body 4.Each RF coil part 3 all is designed to combine independently the 2nd RF coil (pick-up winding) 5, and described the 2nd RF coil is serving as measuring sensor.
Each pick-up winding 5 is adjacent with one of at least two RF coil parts 3 physically, and is suitable for gathering the data relevant with the motion of described patient body 4.Some pick-up windings 5 form the pick-up winding array.Each pick-up winding 5 is connected to receiver 5 (detector electronic circuit), is used to determine the reality that each RF coil part 3 is produced under the different loads condition (or relatively) magnetic field.To carry out the measurement of 5 pairs of voltages of pick-up winding in the RF frequency.Some receivers 7 form array acceptor.Some receivers 7 are connected to processing unit 9.Processing unit 9 is suitable for adopting described exercise data to proofread and correct patient moving in the magnetic resonance imaging, as more detailed description hereinafter.
Fig. 1 shows the synoptic diagram of the system of the present invention that uses general transmit RF coil 2.In addition, show the patient 4 who is in two kinds of different breathing states.According to the present invention, be adjacent to locate some pick-up windings 5 with transmit coil element 3 (not shown in figure 1)s.Here, transmitting RF coil 2 comprise first pick-up winding 5 and second pick-up winding 5 '.Each pick-up winding 5,5 ' be connected to receiver 7 can be each pick-up winding 5,5 ' extract real-time exemplary voltages amplitude (and phase place) from described receiver.
In the use of prior art, these pick-up windings 5, the 5 ' local RF amplitude of feedback (and phase place) data can use these data that calibration information is provided, and are used for correctly regulating RF field amplitude and phase place at each RF coil part 3.In addition, pick-up winding 5,5 ' can be used to provide release mechanism prevents that patient 4 is by the RF overexposure of one or more transmitting RF coil parts 3.
The present invention relates to use extraly can from pick-up winding 5,5 ' the information that obtains of array.By each RF pulse of multicomponent RF transmitting coil 2 emission all each pick-up winding 5,5 ' in cause induced voltage.The voltage amplitude and the phase place of bringing out in any specific pick-up winding 5,5 ' will be subjected to the RF field control that nearest transmitting RF coil part 3 produces.For the constant power that offers each transmitting RF coil part 3, each pick-up winding 5,5 ' in the induced voltage amplitude also will depend on the local loading condition of each RF coil part 3.
Therefore because each pick-up winding 5,5 ' all adjoins with specific RF coil part 3 and be associated with it, thus from the measured value (voltage) of those pick-up windings 5,5 ' acquisitions as can be seen these specific RF coil part 3 loading patient bodies to how good degree.The contiguous RF coil parts 3 of patient 4 will modulate pick-up winding 5,5 ' on voltage, thereby can judge that patient 4 is more close or further from RF coil part 3.If the patient is air-breathing, expand and close RF coil part 3 in the thoracic cavity.For for approaching each the RF coil part 3 in patient thoracic cavity, related pick-up winding 5,5 ' voltage will change, and will be according to patient 4 breathing pattern and modulated.As a result, utilize the voltage of pick-up winding 5,5 ' measurement, can detect patient 4 respiratory movement, and next detect the respiratory cycle.
The term of execution of typical mr I sequence, via the 2 transmitting RF pulses of transmitting RF coil.Use the transmitting RF coil part 3 of controller 10 control MRI systems 1.The RF pulse according to the loading character of RF coil part 3 each pick-up winding 5,5 ' in bring out voltage.Signal by pick-up winding 5,5 ' measurement is not the NMR signal, but because the voltage that the electric current that flows in the RF coil part is directly responded to, it depends on the load condition of RF coil 2.When the patient exhales (dotted line), (detected during the RF pulse emission) second pick-up winding 5 ' on voltage amplitude will increase, this is vertically to be moved further away from RF coil part owing to health.Voltage amplitude on first pick-up winding 5 also can be along with vertical cross-section changes and changes.But, second pick-up winding 5 ' on voltage may show maximum variation.Because it is periodic breathing, voltage waveform can be sinusoidal curve in essence.
In other words, in the time of within patient 4 is in rigidity multicomponent volume transmit RF coil 2, patient 4 respiratory movement cause each body part periodically towards with away from 3 motions of each RF coil part.This motion causes the local loading changed condition of each RF coil part 3.Each RF coil part 3 as the loading difference of patient respiratory (and possible other) movement function be reflected in apply each pick-up winding 5,5 of RF impulse duration ' in the induced voltage amplitude in.
All pick-up windings 5,5 during the RF emission ' upward the space distribution of voltage amplitude is used to determine in real time patient 4 breathing phase.For this purpose, after RF excitation, in processing unit 9, handle the pick-up coil signals of sampling, to extract for example relevant information with RF impulse duration patient 4 position, thoracic cavity, if promptly the thoracic cavity is expanded, second pick-up winding 5 ' in voltage will be low; If shrink in the thoracic cavity, this voltage will be high.Before the data acquisition or during provide movable information to processing unit 9 so that revise the various character of MR pulse train aloft.According to the voltage of measuring, for example, can be that follow-up MR data acquisition step is selected specific coding step, this step minimizes exercise effect according to the preferred version that k spatial sampling and wall of the chest location association are got up.In addition, can estimate the relative variation of FOV from the variation of pick-up winding voltage, thereby can change the measurement gradient amplitude aloft, to compensate.To explain these steps hereinafter in more detail.
Substitute or replenish as respirometric, under the situation of the heart movement of observing patient 4 or any other motion, same cardinal rule also is suitable for.Also should be understood that, but when from the respirometric information time spent, all are used to from the current MRI method of respirometric information (promptly via mechanical bellows) all suitable equally.
Most convenient and preferred topology be with each receiver 7,7 of each pick-up winding 5,5 ' be connected to ', make received signal by available under the control fully of demodulation and the data processing software in processing unit 9, carried out.(not shown) in another embodiment can utilize diode circuit that pick-up winding voltage is carried out rectification and it is fed in the comparer, with via standard interface to processing unit 9 report voltage levels.
With reference to figure 2, will explain the different step of the inventive method now.At first, via transmitting RF coil transmitting RF pulse (RF waveform 20).On " RF excitation " figure, show RF waveform 20.There is shown the shape of the gradient waveform that is launched in this case, the i.e. gradient sequence 21 of MRI system in " section ".In " measurement " figure, show the waveform of measuring gradient 22, it is used for measuring the MR signal after excite magnetic resonances.There is shown preparation gradient 23 (encode gradient) in " preparation ".RF waveform 20 shown in " RF excitation " figure and use gradient sequence 21 are selected section in patient's 4 bodies." measurement " and " preparation " figure is used to read the MR signal.
In " MR sample " figure, show the sampling of NMR data, promptly receive the RF energy from the RF coil.Show " sample " zone 24, wherein, during measuring to the MR data sampling.The repeated several times of should sampling.
Below " pick-up winding sample " figure in, show the sampling (square frame " sample " 25) of during RF excitation, carrying out voltage on the pick-up winding.Before time to the MR data sampling, there is shown " process modification " square frame 26 at " pick-up winding sample " curve, it shows between RF sampling and MR signal sampling, has the time of revising the MR sampling plan.In other words, at this time durations, can utilize sampled data processing MR data and extract any movable information.For example, judge from the RF signal of sampling where patient 4 for example is in the respiratory cycle.Based on this information,, for example utilize look-up table etc. to make judgement by processing unit 9.As a result, certain measured waveform shape 22 or certain preparation gradient shape 23 have been selected.Carry out the step of carrying out during " process modification " square frame 26 by processing unit 9, described processing unit 9 is connected to RF transmit coil element 3 via controller 10, to form closed control circuit.
Next, can be used for image reconstruction after a while by processing unit 9 and data-carrier store (not shown) stores processor result; Perhaps can use result to revise two gradient channel, promptly revise the current images collection by processing unit 9.Under latter event, change according to the result of the sampling of during RF excitation, carrying out and to measure gradient 22 and to prepare gradient 23.For example, find that patient 4 is current and exhale, just can select the specific coding state of preparation gradient 23 at this time point if handle the pick-up winding measured value.
Fig. 3 shows the synoptic diagram of multicomponent emission/reception (Tx/Rx) the RF coil 2 with ten RF coil parts 3.Patient 4 by ten independently RF coil part 3 center on, each RF coil part comprises the independent pick-up winding 5 adjacent with RF coil part 3.
Although in the embodiment that above illustrates, adopted at least two pick-up windings 5,5 ', the present invention also can only utilize a pick-up winding 5 work.In this case, must to do some hypothesis, make pick-up winding 5 can be positioned at detecting the most responsive place of particular types motion about patient 4 physical motion.
Fig. 4 shows the schematic construction of the single passage of multi-channel RF emission coefficient 1.For each passage, system uses the single pick-up winding 5 that is connected to RF amplifier 28 by concentric cable 27 ", this pick-up winding is a part that sends link.In other words, use independently RF amplifier 28 at each RF coil part 3.The transmitter of not shown system 1 and other parts among Fig. 4.In this example, pick-up winding 5 brings out the voltage that can monitor in " placing very near RF coil 2, make that alternating current in the conductor of RF coil 2 is at pick-up winding 5 ".When being RF coil 2 loading patients, the electric current in the RF coil 2 is modulated, pick-up winding 5 " via the corresponding this situation that senses that changes in inductive coupling and the voltage.In other words, when 28 emissions of RF amplifier, use forward and reflective power to represent the state of load.
Fig. 5 shows alternative of the present invention, wherein, utilizes directional coupler 29 to replace pick-up winding in each passage of systems.The RF power section that is transmitted into load is called incident power.Be called as " reflection " power from the RF () power section of load reflection.A part of forward and reflective power between directional coupler 29 present sensing RF amplifiers 28 and the RF coil part 3.When the load variations of RF coil part 3, the impedance variation of RF coil 2, this reflective power that causes measuring changes.So, indirectly, can especially, monitor RF coil part 3 by measuring reflective power voltage from directional coupler 29 by measuring the voltage on the reflective power port 30.
RF coil part 3 is to use the resonance structure on the copper ring road (inductor) of usually connecting with capacitor 31.They are resonance together, and between inductor and capacitor positive energy exchange.Utilize the pick-up winding 5 near RF coil 2, can monitor the electric current that changes in RF coil (inductor) the copper ring road via inductive coupling, as mentioned above, this is measured as the change in voltage on the pickup loops.Yet, can observe this identical voltage modulated by the voltage at direct Measurement of capacitor 31 two ends.So Fig. 6 shows alternative of the present invention, wherein,, directly measure the voltage that has such as parts (for example fixed condenser 31) two ends of predetermined electromagnetic properties such as electric capacity, inductance, resistance for each passage of system.This voltage is proportional to the load of RF coil 2.But, in this case, voltage may be higher, must carefully not increase resistance, and this may destroy RF coil resonance performance.
Described all utensils are transformed to carry out the method according to this invention.Construct all devices, especially processing unit 9 and programming Control, thus the flow process of data and data processing is obtained in the method according to this invention operation.Processing unit 9 is suitable for carrying out all tasks of calculating measurement data and definite and assessment result.According to the present invention, this utilizes a kind of computer software to realize that this computer software comprises computer instruction, and when executive software in processing unit 9, this computer instruction is suitable for carrying out the step of the inventive method.Processing unit 9 itself can comprise functional module or the unit that is embodied as hardware, form of software or both array configurations.In a preferred embodiment of the invention, processing unit 9 is embodied as the form of microcomputer.
For a person skilled in the art, apparent, the invention is not restricted to the details of the above embodiment that illustrates, and can realize the present invention and not break away from its spirit or essential attribute by other particular forms.Therefore these embodiment to be considered as from all aspects exemplary and nonrestrictive, scope of the present invention by claims but not above description show, therefore be intended to contain the implication that drops on claim important document of equal value and all changes in the scope.What will understand in addition is, " comprising ", other elements or step do not got rid of in a speech, and word " " or " one " do not get rid of a plurality of, and discrete component, and for example the function of the some devices described in the claim can be finished in computer system or another unit.Reference numeral in the claim should not be illustrated as limiting the related right requirement.
Claims (13)
1, a kind of magnetic resonance imaging system (1) comprises
-the one RF coil (2), it is suitable for gathering the magnetic resonance imaging data of patient body;
-some measuring sensors (5,5 ', 5 ", 29,31), it is to the load variations sensitivity of a described RF coil (2), described measuring sensor (5,5 ', 5 ", 29,31) be suitable for gathering the data relevant with the motion of described patient body; And
-processing unit (9), it is suitable for adopting described exercise data to proofread and correct patient moving in the magnetic resonance imaging.
2, magnetic resonance imaging system according to claim 1 (1), wherein, described load-sensitive measuring sensor (5,5 ', 5 ", 29,31) be suitable for gathering described patient's (4) breathing and/or heart movement.
3, magnetic resonance imaging system according to claim 1 (1), wherein, a described RF coil (2) is only transmitting coil or emission/receiving coil.
4, magnetic resonance imaging system according to claim 1 (1), wherein, a described RF coil (2) is a multicomponent RF coil.
5, magnetic resonance imaging system according to claim 4 (1), wherein, each RF coil part (3) comprise himself the load-sensitive measuring sensor (5,5 ', 5 ", 29,31).
6, magnetic resonance imaging system according to claim 4 (1), wherein, described load-sensitive measuring sensor (5,5 ', 5 ", 29,31) quantity be not equal to the quantity of described RF coil part (3).
7, magnetic resonance imaging system according to claim 4 (1), wherein, described multicomponent RF coil (2) is suitable for directly being positioned on the described patient (4).
8, magnetic resonance imaging system according to claim 1 (1), wherein, a described RF coil (2) is a quadrature birdcage coil, and described load-sensitive measuring sensor (5 is set, 5 ', 5 ", 29,31) with the horizontal mode of resonance that detects a described RF coil (2) and the vertical load variations of mode of resonance.
9, magnetic resonance imaging system according to claim 1 (1), wherein, the load-sensitive measuring sensor comprise the 2nd RF coil that is coupled to described RF coil (2) (5,5 ', 5 ") and/or directional coupler (29) and/or electric or electronic unit (31).
10, a kind of MR imaging method, it comprises the steps:
-gather the magnetic resonance imaging data of patient body by a RF coil (2);
-by some measuring sensors (5,5 ', 5 ", 29,31) gather the data relevant with the motion of described patient body, described measuring sensor is to the load variations sensitivity of a described RF coil (2); And
-adopt described exercise data to proofread and correct patient moving in the magnetic resonance imaging by processing unit (9).
11, MR imaging method according to claim 11 wherein, is gathered described magnetic resonance imaging data and data described and that patient moving is relevant simultaneously with RF transmission (20).
12, MR imaging method according to claim 11, wherein, described aligning step is included in described RF transmission (20) and adjusts described MRI sequence afterwards.
13, a kind of computer program that is used to carry out MR imaging method; In described method, gather the magnetic resonance imaging data of patient body by a RF coil (2); And in described method, by some measuring sensors (5,5 ', 5 ", 29,31) gather the data relevant with the motion of described patient body, described measuring sensor is to the load variations sensitivity of a described RF coil (2); Described program comprises the computer instruction of proofreading and correct the patient moving in the magnetic resonance imaging by the described exercise data of processing unit (9) employing, wherein, carries out described computer program in computing machine.
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| CN101966081A (en) * | 2010-08-05 | 2011-02-09 | 华东师范大学 | Method for correcting influence of breathing information on resting state function magnetic resonance brain imaging |
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