CN103271740B - Magnetic resonance imaging method employing and system - Google Patents
Magnetic resonance imaging method employing and system Download PDFInfo
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- CN103271740B CN103271740B CN201310237595.8A CN201310237595A CN103271740B CN 103271740 B CN103271740 B CN 103271740B CN 201310237595 A CN201310237595 A CN 201310237595A CN 103271740 B CN103271740 B CN 103271740B
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- 238000002595 magnetic resonance imaging Methods 0.000 title claims abstract description 31
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- 238000006073 displacement reaction Methods 0.000 claims description 25
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- 238000013421 nuclear magnetic resonance imaging Methods 0.000 claims description 16
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Abstract
The present invention relates to a kind of magnetic resonance imaging method employing and system.This magnetic resonance imaging method employing comprises detecting whether meet the predetermined condition of scanning by navigation module; When meeting the condition of scanning, treating imaging region by scan module and carrying out scanning and image data; Send breathing prompting message, and continue to detect whether meet the predetermined condition of scanning by navigation module; Imaging is carried out according to these data.Magnetic resonance imaging method employing of the present invention and system can make patient coordinate the present invention to detect according to breathing information, breathing information can remind patient to carry out respiratory movement according to the rule preset, make can effectively evade during scanning imagery the error brought because of respiratory movement, thus make the imaging precision of this method higher.
Description
Technical field
The present invention relates to a kind of medical imaging procedure, particularly a kind of magnetic resonance imaging method employing.
In addition, the invention still further relates to a kind of medical image system, especially a kind of nuclear magnetic resonance imaging system.
Background technology
Along with the development of medical skill, NMR (Nuclear Magnetic Resonance)-imaging (MagneticResonanceImaging, MRI) equipment becomes a kind of a kind of visual plant detecting serious disease, want disease day by day.Obtained the medical image of internal body organs by NMR (Nuclear Magnetic Resonance)-imaging, can determine that the state of an illness of patient provides valuable information for doctor.
Usually, NMR (Nuclear Magnetic Resonance)-imaging has two kinds of important functional imaging methods: one is Diffusion-Weighted MR Imaging (DiffusionWeightedImaging, DWI), another is Dynamic contrast enhance imaging (DynamicContrast-enhancedmagneticresonanceimaging, DCE).These two kinds of formation methods obtain the precise degrees of medical image, become the important indicator evaluating NMR (Nuclear Magnetic Resonance)-imaging.
For DWI or DCE of human liver, the main cause accurately affecting liver DWI and DCE is derived from the breathing of people.When people breathes, liver can move along with position occurs in breathing.The displacement of liver in imaging process can cause serious artifact, thus makes imaging results have comparatively big error.
For liver DWI acquisition technique, in prior art, liver DWI acquisition technique comprises free breathing technique (free-breath), single breath-hold technology (Single-shot), respiratory gating technology (respiratory-gated) and breathes airmanship (navigator) etc.
Freely breathe DWI and obviously have obvious movable information.Though single breath-hold DWI at utmost can reduce the impact of moving, have the shortcomings such as signal noise ratio (snr) of image is low, Scan slice thickness is thicker, and a lot of patient often there is respiratory movement by a small margin in the later stage of holding one's breath, and therefore also has componental movement artifact effects.
Though respiration gate control DWI and breathing navigation DWI technology gather image when diaphragm motion amplitude is minimum, can to a certain degree reduce motion artifacts, but in the acquisition time window of these two kinds of methods, liver and diaphram still have motion, and motion artifacts situation is still severe.And, DWI data acquisition mostly is multi collect (multiple NEX, numberofexcitations), motion is certainly existed between each NEX not quite identical in volume, and nuclear magnetic resonance scanning machine is rebuild after the data that repeatedly NEX gathers are averaged to form when rebuilding image, therefore, the image of DWI contains the information of motion artifacts.
Again for liver DCE.In prior art, the usual last for several minutes of liver DCE acquisition time, can not realize breath-hold scans.Because the temporal resolution of DCE requires in 10 seconds (usual 5 to 8 seconds), and not only there is motion artifacts in respiration gate control of the prior art and breathing airmanship, also there is the problem that acquisition window is narrow.And the eupnea mode mentioned in prior art, row is crown or sagittal plain scanning (in order to comprise diaphram, the image registration for DCE date processing) tiltedly.Therefore, during image acquisition, liver is kept in motion always.
In sum, all there is motion artifacts in DWI and DCE acquisition technique of the prior art, image morphology causes image blurring.And when processing DWI and DCE data, then can cause the parameter value substantial deviation actual value (relative to resting state) of region of interest (RegionofInterests, ROI), more severe patient can not calculate relevant parameter.
In addition, artifact eliminating methods more of the prior art are also difficult to meet actual needs.
Motion artifact correction of the prior art mainly contains two kinds of methods, and one is retrospective image registration method, and one is prospective motion corrective method.
To retrospective image registration method, use special image registration software (as 3D-slicer), according to some anatomic landmark (as blood vessel), according to rigidity or non-rigid principle, image is carried out registration, correct the motion between each acquired volume, thus a kind of method of motion artifacts on the impact of result can be reduced.But current clinical conventional method carries out registration to DWI and the DCE image rebuild (namely nuclear magnetic resonance scanning machine calculates the image presented).As previously mentioned, for calculating the image of DWI and DCE parameter inherently containing motion artifacts information, the positional fault (inter-volumevariation) between different acquisition volume can only be corrected by traditional image registration mode, and the positional fault (intra-volumevariation) in acquired volume can not be corrected.
To prospective motion correction method, namely during image data with regard to correction of movement.When conventional Christmas method carries out data acquisition, excitation pulse locus is constant, if there is motion (to move continuously, as free breathing, respiration gate control and breathing navigation; Or non-navigational is repeatedly held one's breath method), not in the same time, the center in target layer face does not overlap with radio-frequency (RF) excited center, and the radio-frequency (RF) excited therefore suffered by target layer face is not quite identical, and the echo signal intensity obtained thus is also not quite similar.And the parameter of DWI and DCE is all get according to signal derivation calculating, the various parameter values calculated according to signal are therefore finally caused to produce error.By above-mentioned image registration, even if coupling can not avoid the inconsistent this error caused of signal completely, the precision of corresponding image biological marker therefore will inevitably be had influence on.
As from the foregoing, even if having employed the motion artifacts school antidote mentioned in prior art, the precision of DCE and the DWI image after the correction obtained still has comparatively big error, is unfavorable for precisely presenting of image, has larger drawback.
Therefore, the image of magnetic resonance imaging method employing gained of the prior art also exists the larger technical problem of error, and the image of nuclear magnetic resonance imaging system gained of the prior art also also exists the larger technical problem of error.
Summary of the invention
The image obtained in view of magnetic resonance imaging method employing of the prior art also exists the larger technical problem of error, is necessary the magnetic resonance imaging method employing providing a kind of gained image error less.
Meanwhile, the image obtained in view of nuclear magnetic resonance imaging system in prior art also exists the larger technical problem of error, is also necessary the nuclear magnetic resonance imaging system providing a kind of gained image error less.
Concrete technical scheme of the present invention is as follows:
The invention provides a kind of magnetic resonance imaging method employing.This magnetic resonance imaging method employing comprises step: detect whether meet the predetermined condition of scanning by navigation module; When meeting the condition of scanning, treating imaging region by scan module and carrying out scanning and image data; Send breathing prompting message, and continue to detect whether meet the predetermined condition of scanning by navigation module; Circulation performs above step, after the scanning treating imaging region through repeatedly having circulated, the data summarization at every turn scanned is carried out imaging according to these data; Or comprise circulation and perform following steps: detect whether meet the predetermined condition of scanning by navigation module; When meeting the condition of scanning, treating imaging region by scan module and carrying out scanning and image data; Send breathing prompting message, and continue to detect whether meet the predetermined condition of scanning by navigation module; Imaging is carried out according to these data.
In a detailed description of the invention optimized further, whether step meets the predetermined condition of scanning by navigation module continuation detection comprises: launch detection signal to navigation bar, obtain the physical location of this navigation bar; Calculate the displacement of adjacent this navigation bar acquired for twice.
In a detailed description of the invention optimized further, this magnetic resonance imaging method employing also comprises step: the physical location obtaining once this navigation bar every 50 milliseconds; When the displacement of continuous three these navigation bars is less than 1 millimeter, this scan module carries out scanning and image data to this region to be imaged.
In a detailed description of the invention optimized further, step sends prompting message and comprises step: this prompting message comprises the first prompting message and the second prompting message; This scan module scan this region to be imaged and image data is more than or equal to 6 seconds time, send this first prompting message; After being more than or equal to 1.5 seconds after this first prompting message sends, send this second prompting message; This first prompting message and this second prompting message are shown by display device, and this first prompting message is for reminding ventilation, and this second prompting message is used for prompting and holds one's breath.
The present invention also provides a kind of nuclear magnetic resonance imaging system.This nuclear magnetic resonance imaging system comprises: navigation module, whether meets the predetermined condition of scanning for detecting; Scan module, carries out scanning and image data for treating imaging region when meeting the condition of scanning; Prompting module, for sending breathing prompting message; Circulation execution module, performs this navigation module, scan module, prompting module, with through the scanning treating imaging region that repeatedly circulated for circulating; Image-forming module, carries out imaging according to these data for the data summarization that will scan at every turn; Or comprising: circulation execution module, performing following navigation module, scan module, prompting module, image-forming module, with through the scanning treating imaging region that repeatedly circulated for circulating; Whether navigation module, meet the predetermined condition of scanning for detecting; Scan module, carries out scanning and image data for treating imaging region when meeting the condition of scanning; Prompting module, for sending breathing prompting message; Image-forming module, for carrying out imaging according to these data.
In a detailed description of the invention optimized further, this navigation module comprises: signal transmitter unit, for launching detection signal to navigation bar; Position acquisition unit, for obtaining the physical location of this navigation bar; Displacement computing unit, for calculating the displacement of adjacent this navigation bar acquired for twice.
In a detailed description of the invention optimized further, this position acquisition unit is also for obtaining once the physical location of this navigation bar every 50 milliseconds; This navigation module also comprises condition judgment unit, this condition judgment unit be used for the displacement of this navigation bar is continuous be less than 1 millimeter three times time notify that this scan module carries out scanning also image data to this region to be imaged.
In a detailed description of the invention optimized further, this prompting module comprises the first prompting message unit and the second prompting message unit; This first prompting message unit is used for sending the first prompting message when this scan module scans this region to be imaged and image data is more than or equal to 6 seconds; This second prompting message unit sends the second prompting message after being used for being more than or equal to 1.5 seconds after this first prompting message sends; This prompting module is also for showing this first prompting message and this second prompting message by display device, and this first prompting message is for reminding ventilation, and this second prompting message is used for prompting and holds one's breath.
In a detailed description of the invention optimized further, this nuclear magnetic resonance imaging system also comprises: circulation execution module, for this navigation module of loop start, scan module, prompting module and image-forming module: or this circulation execution module is used for this navigation module of loop start, scan module and prompting module.
Compared to prior art, main beneficial effect of the present invention is:
Because magnetic resonance imaging method employing of the present invention comprises step: detect whether meet the predetermined condition of scanning by navigation module; When meeting the condition of scanning, treating imaging region by scan module and carrying out scanning and image data; Send breathing prompting message, continue to detect whether meet the predetermined condition of scanning by navigation module; Imaging is carried out according to these data; Make magnetic resonance imaging method employing of the present invention that patient can be made to coordinate the present invention to detect according to breathing information, breathing information can remind patient to carry out respiratory movement according to the rule preset, make can effectively evade during scanning imagery the error brought because of respiratory movement, thus make the imaging precision of this method higher.
Because this nuclear magnetic resonance imaging system of the present invention comprises: navigation module, whether meet the predetermined condition of scanning for detecting; Scan module, carries out scanning and image data for treating imaging region when meeting the condition of scanning; Prompting module, for sending breathing prompting message; Image-forming module, for carrying out imaging according to these data; Make magnetic resonance imaging method employing of the present invention that patient can be made to coordinate the present invention to detect according to breathing information, breathing information can remind patient to carry out respiratory movement according to the rule preset, make can effectively evade during scanning imagery the error brought because of respiratory movement, thus make the imaging precision of this method higher.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of a preferred implementation of magnetic resonance imaging method employing of the present invention;
Fig. 2 is the module diagram of a preferred implementation of nuclear magnetic resonance imaging system of the present invention.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not used for limiting the present invention.
Refer to Fig. 1 and Fig. 2, Fig. 1 is the schematic flow sheet of a preferred implementation of magnetic resonance imaging method employing of the present invention; Fig. 2 is the module diagram of a preferred implementation of nuclear magnetic resonance imaging system of the present invention.
Nuclear magnetic resonance imaging system 2 of the present invention comprises a navigation module 21, scan module 22, prompting module 23 and an image-forming module 24.Whether this navigation module meets the predetermined condition of scanning for detecting; This scan module 22 carries out scanning and image data for treating imaging region when meeting the condition of scanning; This prompting module 23, for sending breathing prompting message; This image-forming module 24, for carrying out imaging according to these data.
Navigation sequence works based on spin echo (spinecho).Using the slice selective gradient thing of both direction, only have the spin of the aspect infall of this both direction just can meet again and produce echo-signal, the so-called navigation bar in the arrowband (navigator) of this infall.When this navigation bar is arranged on diaphram time, just can be used for following the tracks of the motion of diaphram.The navigation signal that diaphram produces is through RT-Hawk (Reference:SantosJM, WrightGA, PaulyJM.Flexiblereal-timemagneticresonanceimagingframewo rk.ConfProcIEEEEngMedBiolSoc2004; 2:1048-1051) be sent to external computer, the relative displacement of diaphram can be obtained after process in real time.This relative displacement can be fed back to the computer for controlling system of NMR (Nuclear Magnetic Resonance)-imaging at once, and in 50ms, adjusts sweep parameter, to realize motion real-time tracking and correction.
Namely this navigation module 21 comprises for launching the checkout gear with detection signal, and detection signal is converted to the computer system of navigation bar relative displacement.Concrete, this navigation module comprises: signal transmitter unit, for launching detection signal to navigation bar; Position acquisition unit, for obtaining the physical location of this navigation bar; Displacement computing unit, for calculating the displacement of adjacent this navigation bar acquired for twice.
This scan module 22 can be common DWI sequence scanning or DCE sequence scanning.
This prompting module 23 is generally a display device.This prompting module 23 can be used for showing ventilation information or information of holding one's breath.Ventilation information is that information of holding one's breath is for telling that patient should hold the breath for telling that patient should respiratory ventilation.Also giving in embodiment in addition, this prompting module 23 can also comprise an audio unit.While information of holding one's breath with word or image display ventilation information the latter, prompting sound can also be sent, avoid patient to slip.
This image-forming module 24 accepts the data message that this scan module 22 transmits, and these data are converted into visual medical image according to the parameter etc. pre-set.
Magnetic resonance imaging method employing of the present invention comprises step:
S11, detect whether meet the predetermined condition of scanning by navigation module;
First, by signal transmitter unit, detection signal is launched to navigation bar.Navigation bar is obtained by this position acquisition unit by producing echo-signal, and calculates the physical location of this navigation bar by this echo-signal.This displacement computing unit according to time interocclusal record each sampling time the physical location of navigation bar, and calculate the displacement of adjacent twice navigation bar.That is, displacement is the absolute value of the difference of the physical location of current time navigation bar and the physical location of last sampling instant navigation bar.
Under normal circumstances, be often separated by 50 milliseconds, this signal transmitter unit, this position acquisition unit and this displacement computing unit just perform above-mentioned job step, to implement the position and the displacement that obtain navigation bar.
In the preferred implementation of magnetic resonance imaging method employing of the present invention, this predetermined condition of scanning is: the displacement of continuous three these navigation bars is less than 1 millimeter.In another one embodiment, this predetermined condition of scanning also can be less than 1 millimeter, 2 millimeters or 0.8 millimeter etc. for the displacement of continuous four times, five times or more times this navigation bar.The concrete condition of scanning preset can also adjust according to practical situation, and this condition of scanning preset is mainly in order to determine region to be imaged pause motion or basic pause motion.As long as the condition of this region to be imaged pause motion or basic pause motion can be determined, this predetermined condition of scanning can be set as.
S12, when meeting the condition of scanning, treating imaging region by scan module and carrying out scanning image data;
When the displacement of continuous three these navigation bars is less than 1 millimeter, starts this scanning element and treat imaging region and scan, thus obtain corresponding data.
Generally for and can obtain imaging data clearly, in the preferred implementation of magnetic resonance imaging method employing of the present invention, this scan module is preset as 6 seconds the sweep time to this region to be imaged.In another one embodiment, this sweep time of presetting also can be more than 6 seconds.The length of concrete Preset Time, can to take a breath the ability of holding one's breath and determining according to patient.Such as, people's vital capacity is less, and breath holding time is shorter, then this sweep time of presetting can be located 6 seconds; If people's vital capacity is comparatively large, ability of holding one's breath is longer, and breath holding time is longer, and this scheduled time more than 10 seconds, so can be located any one numerical value in 6 to 10 seconds by each breath holding time.
After the collection of this scan module 22 obtains the data being used for imaging, these data are passed to this image-generating unit 24, this this image-generating unit 24 carries out imaging according to these data, forms the medical image that can be used for doctor's reference.
This scan module 22 can by starting DCE-3DSPGR (three-dimensional rich phase gradient echo sequence, 3dimensionalspoiledgradient-recalledacquisition, 3D-SPGR) or DWI-EPI (diffusion-weighted Echo-plane imaging, echoplanarimagingdiffusion-weightedmagneticresonanceimag ing, EPI-DWI) sequence pair region to be imaged scans.When scanning, the sweep parameter of nuclear magnetic resonance imaging system 2 of the present invention, comprise radio frequency transmit and receive frequency phase information (RFtransmitandreceivefrequenciesandphases) relative to the numerical value in step S11 all need adjustment.
S13, send breathing prompting message, and continue to detect whether meet the predetermined condition of scanning by navigation module;
This prompting message comprises the first prompting message and this second prompting message; This scan module scan this region to be imaged and image data is more than or equal to 6 seconds time, send this first prompting message; After being more than or equal to 1.5 seconds after this first prompting message sends, send this second prompting message; This first prompting message and this second prompting message are shown by display device, and this first prompting message is for reminding ventilation, and this second prompting message is used for prompting and holds one's breath.
Particularly, this first prompting message can be " please take a breath, time of exchanging gas is 1.5 seconds "; This second prompting message can be " please hold one's breath, breath holding time please more than 6 seconds ".Meanwhile, this prompting module 23 can also comprise a timing unit, this timing unit can remind the ventilation of patient's distance how long to also have by the method for countdown.As previously mentioned, when the sweep time in step S12 be 7 seconds, 8 seconds or 9 seconds time, these remind time of holding one's breath just to be divided into is 7 seconds, 8 seconds or 9 seconds.
Certainly, the time of people's ventilation also can pre-set, and specifically determines with the situation of patient own.
In another one embodiment, after step S12 executes, perform step S11 while reminding ventilation, that is, step S11 and step S12 alternately performs.Remind the step of ventilation and step S11 to perform, namely step S13 comprises prompting ventilation and step S11 simultaneously.This place is for convenience of description, in various embodiments, also can by prompting ventilation and step S11 described separately.
S14, carry out imaging according to these data.
When step S12 is finished, the data that can be gathered by image-forming module 24 pairs of scan modules 22 are processed, and these data are converted to medical image.Common, in different practical applications, the data that each one scan obtains can only form a subdivision of a complete medical image.That is, the scanning of a usual internal body organs needs scanning repeatedly just can complete, and scanning each time is only a local for this internal.Therefore, in another one embodiment, as needed to carry out medical imaging to whole organ or to a larger region, simultaneously in view of each scanning can only scan a zonule, then magnetic resonance imaging method employing of the present invention needs to carry out Multiple-Scan.Concrete, be several or dozens of zonule by a larger region segmentation, often to hold one's breath one of them region of single pass, hold one's breath and repeatedly complete the scanning of the plurality of zonule, the data summarization scanned the plurality of zonule is to image-forming module, this image-forming module processes according to the plurality of data, the medical image required for final acquisition.
In sum, magnetic resonance imaging method employing of the present invention and system are by adopting step ventilation and the method for holding one's breath, by the guiding of taking a breath to patient and hold one's breath, the displacement of diaphram after being held one's breath by linear navigation Sequence Detection, patient hold one's breath and its diaphram substantially without motion time to patient carry out scanning acquisition data, point out patient to carry out ventilation and hold one's breath after each scanning, scan again afterwards next time; Data eventually through scanning gained carry out imaging.Therefore, relative to prior art, magnetic resonance imaging method employing of the present invention and system can effectively be eliminated because breathe the internal's motion caused and the artifact problem caused, thus make the precision finally obtaining medical image higher.
Those skilled in the art should understand, embodiments of the invention can be provided as method, system, also can be computer program.When for computer program, by loading the computer program that can embody method of the present invention, magnetic resonance imaging device can be transferred and run according to method of the present invention, thus realizing various objects described in the invention, solve corresponding technical problem, actualizing technology effect.
Therefore, the present invention can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the present invention can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to disk memory, CD-ROM, optical memory etc.) of computer usable program code.
The present invention describes with reference to according to the flow chart of the method for the embodiment of the present invention, terminal (system) and computer program and/or block diagram.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can being provided to the processor of general purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computer or other programmable data processing device produce device for realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices is provided for the step realizing the function of specifying in flow chart flow process or multiple flow process and/or block diagram square frame or multiple square frame.
It should be noted that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (8)
1. a magnetic resonance imaging method employing, comprises step:
Detect whether meet the predetermined condition of scanning by navigation module;
When meeting the condition of scanning, treating imaging region by scan module and carrying out scanning and image data;
Send breathing prompting message, and continue to detect whether meet the predetermined condition of scanning by navigation module;
Circulation performs above step, after the scanning treating imaging region through repeatedly having circulated, the data summarization at every turn scanned is carried out imaging according to these data;
Or comprise circulation and perform following steps:
Detect whether meet the predetermined condition of scanning by navigation module;
When meeting the condition of scanning, treating imaging region by scan module and carrying out scanning and image data;
Send breathing prompting message, and continue to detect whether meet the predetermined condition of scanning by navigation module;
Imaging is carried out according to these data.
2. magnetic resonance imaging method employing according to claim 1, is characterized in that, step is detected by navigation module and whether meets the predetermined condition of scanning and comprise: launch detection signal to navigation bar, obtain the physical location of this navigation bar;
Calculate the displacement of adjacent this navigation bar acquired for twice.
3. magnetic resonance imaging method employing according to claim 2, is characterized in that, this magnetic resonance imaging method employing also comprises step:
The physical location of this navigation bar is obtained once every 50 milliseconds;
When the displacement of continuous three these navigation bars is less than 1 millimeter, this scan module carries out scanning and image data to this region to be imaged.
4. magnetic resonance imaging method employing according to claim 1, is characterized in that, step sends prompting message and comprises step:
This prompting message comprises the first prompting message and the second prompting message; This scan module scan this region to be imaged and image data is more than or equal to 6 seconds time, send this first prompting message; After being more than or equal to 1.5 seconds after this first prompting message sends, send this second prompting message;
This first prompting message and this second prompting message are shown by display device, and this first prompting message is for reminding ventilation, and this second prompting message is used for prompting and holds one's breath.
5. a nuclear magnetic resonance imaging system, comprising:
Whether navigation module, meet the predetermined condition of scanning for detecting;
Scan module, carries out scanning and image data for treating imaging region when meeting the condition of scanning;
Prompting module, for sending breathing prompting message;
Circulation execution module, performs this navigation module, scan module, prompting module, with through the scanning treating imaging region that repeatedly circulated for circulating;
Image-forming module, carries out imaging according to these data for the data summarization that will scan at every turn;
Or comprise:
Circulation execution module, performs following navigation module, scan module, prompting module, image-forming module, with through the scanning treating imaging region that repeatedly circulated for circulating;
Whether navigation module, meet the predetermined condition of scanning for detecting;
Scan module, carries out scanning and image data for treating imaging region when meeting the condition of scanning;
Prompting module, for sending breathing prompting message;
Image-forming module, for carrying out imaging according to these data.
6. nuclear magnetic resonance imaging system according to claim 5, is characterized in that, this navigation module comprises:
Signal transmitter unit, for launching detection signal to navigation bar;
Position acquisition unit, for obtaining the physical location of this navigation bar;
Displacement computing unit, for calculating the displacement of adjacent this navigation bar acquired for twice.
7. nuclear magnetic resonance imaging system according to claim 6, is characterized in that:
This position acquisition unit is also for obtaining once the physical location of this navigation bar every 50 milliseconds;
This navigation module also comprises condition judgment unit, this condition judgment unit be used for the displacement of this navigation bar is continuous be less than 1 millimeter three times time notify that this scan module carries out scanning also image data to this region to be imaged.
8. nuclear magnetic resonance imaging system according to claim 5, is characterized in that:
This prompting module comprises the first prompting message unit and the second prompting message unit;
This first prompting message unit is used for sending the first prompting message when this scan module scans this region to be imaged and image data is more than or equal to 6 seconds; This second prompting message unit sends the second prompting message after being used for being more than or equal to 1.5 seconds after this first prompting message sends;
This prompting module is also for showing this first prompting message and this second prompting message by display device, and this first prompting message is for reminding ventilation, and this second prompting message is used for prompting and holds one's breath.
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|---|---|---|---|---|
| CN106572817B (en) * | 2014-08-11 | 2020-01-31 | 皇家飞利浦有限公司 | Prospective respiratory triggering with retrospective validation for 4D magnetic resonance imaging |
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