CN109222974A - MR imaging method with flow artifact suppression - Google Patents
MR imaging method with flow artifact suppression Download PDFInfo
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- CN109222974A CN109222974A CN201811451404.7A CN201811451404A CN109222974A CN 109222974 A CN109222974 A CN 109222974A CN 201811451404 A CN201811451404 A CN 201811451404A CN 109222974 A CN109222974 A CN 109222974A
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- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
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Abstract
The invention discloses an MR imaging method with flow artifact suppression, which comprises the following steps: s1: preparing imaging: the patient receiving the MR examination changes the clothes of the all-cotton product, removes all the metal articles on the body, and is forbidden to take the traditional Chinese medicine three days before the examination; s2: radio frequency shielding: during MR scanning, closing a scanning room gate and forbidding using a mobile phone and a radio transmitting device; s3: patient guidance: for patients with restlessness and unconsciousness, a proper amount of sedative is injected, and for patients with the symptoms of the melancholia and the phobia, the matters needing attention in the examination process should be explained in detail before the examination; s4: scanning and imaging: while scanning is being performed, the phase encoding direction is changed. According to the invention, the first MR image obtained by changing the phase encoding direction is compared with the second MR image obtained by utilizing the pre-saturation technology, so that the MR imaging method capable of accurately and intuitively determining the best suppression of the flow artifact can be realized.
Description
Technical field
The present invention relates to MR technical field of imaging more particularly to a kind of imaging sides MR with the inhibition to flow artefacts
Method.
Background technique
Magnetic resonance refers to spin-magnetic resonance (spin magnetic resonance) phenomenon, relatively wide in meaning, includes
Nuclear magnetic resonance (nuclear magnetic resonance, NMR), electron paramagnetic resonance (electron paramagnetic
Resonance, EPR) or electron spin resonance (electron spin resonance, ESR), in addition, people's daily life
In the magnetic resonance often said, refer to magnetic resonance imaging (Magnetic Resonance Imaging, MRI), be total using nuclear-magnetism
One kind made of phenomenon of shaking is used for the imaging device of medical inspection, its classical phenomenological description of magnetic resonance (except cyclotron resonance) is:
Atom, electronics and core all have an angular momentum, and the ratio between magnetic moment and corresponding angular momentum are known as magnetic rotaion comparison γ.Magnetic moment M is in the B of magnetic field
Effect by torque M Bsin θ (θ angle between M and B).This torque makes magnetic moment make precessional motion, the angular frequency of precession around magnetic field
ω=γ B, ω o are known as Larmor frequency.Due to damping action, this precessional motion can attenuate quickly, i.e. M reaches flat with B
Row, precession just stop.But if the vertical direction in magnetic field B adds a high frequency magnetic field b (ω) (angular frequency ω), b (ω) again
The torque that effect generates makes M leave B, opposite with the effect of damping.If the angular frequency of high frequency magnetic field and the Rameau of magnetic moments precession
Equal ω=ω the o of your (angle) frequency, then the effect of b (ω) is most strong, and the angle of precession (angle of M and the angle B) of magnetic moment M is also maximum.This
One phenomenon is magnetic resonance, in the prior art, when carrying out MR imaging, cannot effectively be inhibited to flow artefacts.
Summary of the invention
Technical problems based on background technology, the invention proposes a kind of MR with the inhibition to flow artefacts at
Image space method.
A kind of MR imaging method with the inhibition to flow artefacts proposed by the present invention, comprising the following steps:
S1: imaging prepares: making to receive the clothing that the patient that MR is checked replaces all cotton products, and all metal objects with removing
Product check that first three days forbid taking traditional Chinese medicine；
S2: radio shielding: during carrying out MR scanning, gate between scanning is closed, mobile phone and radio are forbidden to use
Emitter；
S3: patient guidance: for restlessness, the patient of unconsciousness injects appropriate sedative, to closing disease,
The patient of neurosis answers the detailed item explained patient and needed to pay attention in checking process before inspection；
S4: scanning imagery: when being scanned, change phase-encoding direction, obtain the first MR image；
S5: presaturation technology: giving the liquid of flowing in advance in face of inflow scanning slice, radio frequency is sharp to help pulse, is flowing into
Receive radio frequency excitation pulse after scanning level again to be allowed to be saturated, when receiving reunion pulse, due to no transverse magnetisation,
Just without echo-signal, therefore, working fluid does not generate magnetic resonance signal, and finally scanning obtains the 2nd MR image；
S6:MR image comparison: the first MR image and the 2nd MR image described in S4 and S5 are placed on computer and carried out pair
Than obtaining optimal MR image, determining the optimal MR imaging method inhibited to flow artefacts.
Preferably, in the S1, remove with all metals, as headwear, hair fastener, artificial tooth, glasses, necklace, earrings,
Bracelet, ornament, belt, the clothing with Metal buttons, brassiere.
Preferably, in the S1, the patient equipped with pacemaker or metal artificial joint not can be carried out inspection.
Preferably, in the S4, when scanning, will keep breathing steady, never cough or carry out during inspection to swallow dynamic
Make.
Preferably, in the S4, it is previous just to check that the same day please carry X-ray, CT, MRI, radiography that patient did in the past etc.
Doctor's data, for Physician Global analysis, control.
Preferably, in the S4, cranium brain, neurological examination person, be not necessarily to special preparation, row abdomen, pelvioscopy trouble
Person should on an empty stomach, and cooperation breathing, pelvioscopy need to suitably suppress urine, remain stationary as far as possible during the inspection process when inspection.
Preferably, in the S4, when being scanned, first phase code is laterally arranged, scanning obtains the first image, so
Phase code is vertically arranged afterwards, obtains the second image, the first image and the second image are compared, chooses optimal image
As the first MR image.
Preferably, in the S2, before carrying out MR scanning, need to check the working condition of scanning room's equipment, such as direct current lamp
Bubble whether poor contact.
Beneficial effects of the present invention: by changing phase-encoding direction, obtaining the first MR image, using presaturation technology,
The 2nd MR image is obtained, the first MR image and the 2nd MR image are placed on computer and compare, and obtain optimal MR image, determine
It is optimal to flow artefacts inhibit MR imaging method, the present invention by will change phase-encoding direction obtain the first MR image and
The 2nd MR image is obtained using presaturation technology to compare, can be accurate and visual determine inhibit the optimal MR of flow artefacts at
Image space method.
Specific embodiment
Combined with specific embodiments below the present invention is made further to explain.
Embodiment
A kind of MR imaging method with the inhibition to flow artefacts is proposed in the present embodiment, comprising the following steps:
S1: imaging prepares: making to receive the clothing that the patient that MR is checked replaces all cotton products, and all metal objects with removing
Product check that first three days forbid taking traditional Chinese medicine；
S2: radio shielding: during carrying out MR scanning, gate between scanning is closed, mobile phone and radio are forbidden to use
Emitter；
S3: patient guidance: for restlessness, the patient of unconsciousness injects appropriate sedative, to closing disease,
The patient of neurosis answers the detailed item explained patient and needed to pay attention in checking process before inspection；
S4: scanning imagery: when being scanned, change phase-encoding direction, obtain the first MR image；
S5: presaturation technology: giving the liquid of flowing in advance in face of inflow scanning slice, radio frequency is sharp to help pulse, is flowing into
Receive radio frequency excitation pulse after scanning level again to be allowed to be saturated, when receiving reunion pulse, due to no transverse magnetisation,
Just without echo-signal, therefore, working fluid does not generate magnetic resonance signal, and finally scanning obtains the 2nd MR image；
S6:MR image comparison: the first MR image and the 2nd MR image described in S4 and S5 are placed on computer and carried out pair
Than obtaining optimal MR image, determining the optimal MR imaging method inhibited to flow artefacts.
In the present embodiment, in S1, remove with all metals, as headwear, hair fastener, artificial tooth, glasses, necklace, earrings,
Bracelet, ornament, belt, the clothing with Metal buttons, brassiere, in S1, equipped with pacemaker or metal artificial joint
Patient not can be carried out inspection, and in S4, when scanning will keep breathing steady, never cough or carry out swallowing act during inspection,
In S4, check that the same day please carry the previous medical treatment data such as X-ray, CT, MRI, radiography that patient did in the past, for Physician Global
Analysis, control, in S4, cranium brain, neurological examination person are not necessarily to special preparation, row abdomen, pelvioscopy patient should on an empty stomach,
Cooperating breathing when inspection, pelvioscopy need to suitably suppress urine, remain stationary as far as possible during the inspection process, in S4, when being scanned,
First phase code is laterally arranged, scanning obtains the first image, is then vertically arranged phase code, obtains the second image, will
First image is compared with the second image, chooses optimal image as the first MR image, in S2, before carrying out MR scanning,
The working condition for needing to check scanning room's equipment, as D. C. bulb whether poor contact, the beneficial effects of the invention are as follows by changing
Changeable phases coding direction obtains the first MR image, using presaturation technology, obtains the 2nd MR image, the first MR image and second
MR image is placed on computer and compares, and obtains optimal MR image, determines the optimal imaging side MR inhibited to flow artefacts
Method, the present invention by will change phase-encoding direction obtain the first MR image with using presaturation technology obtain the 2nd MR image into
Row comparison, can be accurate and visual determine inhibit the optimal MR imaging method of flow artefacts.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (8)
1. a kind of MR imaging method with the inhibition to flow artefacts, which comprises the following steps:
S1: imaging prepares: makes to receive the clothing that the patient that MR is checked replaces all cotton products, and all metals with removing,
Check that first three days forbid taking traditional Chinese medicine；
S2: radio shielding: during carrying out MR scanning, closing gate between scanning, is forbidden to use mobile phone and radio transmitting
Device；
S3: patient's guidance: for restlessness, the patient of unconsciousness injects appropriate sedative, to closing disease, fear
The patient of disease answers the detailed item explained patient and needed to pay attention in checking process before inspection；
S4: scanning imagery: when being scanned, change phase-encoding direction, obtain the first MR image；
S5: presaturation technology: giving the liquid of flowing in advance in face of inflow scanning slice, radio frequency is sharp to help pulse, scans flowing into
Receive radio frequency excitation pulse after level again to be allowed to be saturated, when receiving reunion pulse, due to no transverse magnetisation, also with regard to nothing
Echo-signal, therefore, working fluid do not generate magnetic resonance signal, and finally scanning obtains the 2nd MR image；
S6:MR image comparison: the first MR image and the 2nd MR image described in S4 and S5 are placed on computer and are compared, is obtained
To optimal MR image, the optimal MR imaging method inhibited to flow artefacts is determined.
2. a kind of MR imaging method with the inhibition to flow artefacts according to claim 1, which is characterized in that described
In S1, remove with all metals, such as headwear, hair fastener, artificial tooth, glasses, necklace, earrings, bracelet, ornament, belt, band
There are clothing, the brassiere of Metal buttons.
3. a kind of MR imaging method with the inhibition to flow artefacts according to claim 1, which is characterized in that described
In S1, the patient equipped with pacemaker or metal artificial joint not can be carried out inspection.
4. a kind of MR imaging method with the inhibition to flow artefacts according to claim 1, which is characterized in that described
In S4, when scanning, will keep breathing steady, never cough or carry out swallowing act during inspection.
5. a kind of MR imaging method with the inhibition to flow artefacts according to claim 1, which is characterized in that described
In S4, check that the same day please carry the previous medical treatment data such as X-ray, CT, MRI, radiography that patient did in the past, for Physician Global
Analysis, control.
6. a kind of MR imaging method with the inhibition to flow artefacts according to claim 1, which is characterized in that described
In S4, cranium brain, neurological examination person are not necessarily to special preparation, row abdomen, pelvioscopy patient should on an empty stomach, when inspection, cooperates
Breathing, pelvioscopy need to suitably suppress urine, remain stationary as far as possible during the inspection process.
7. a kind of MR imaging method with the inhibition to flow artefacts according to claim 1, which is characterized in that described
In S4, when being scanned, first phase code is laterally arranged, scanning obtains the first image, then vertically sets phase code
It sets, obtains the second image, the first image and the second image are compared, choose optimal image as the first MR image.
8. a kind of MR imaging method with the inhibition to flow artefacts according to claim 1, which is characterized in that described
In S2, before carrying out MR scanning, need to check the working condition of scanning room's equipment, as D. C. bulb whether poor contact.
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Citations (8)
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|---|---|---|---|---|
| US6134464A (en) * | 1997-09-19 | 2000-10-17 | General Electric Company | Multi-slice and multi-angle MRI using fast spin echo acquisition |
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| CN101470178A (en) * | 2007-12-29 | 2009-07-01 | 西门子（中国）有限公司 | Method and apparatus for restraining residual motion artifact |
| US20130342202A1 (en) * | 2012-06-26 | 2013-12-26 | John P. Mugler, III | Magnetic resonance system and operating method for flow artifact reduction in slab selective space imaging |
| US20140077807A1 (en) * | 2012-09-19 | 2014-03-20 | Robert R. Edelman | System and method for imaging of vascular structures using non-contrast enhanced magnetic resonance imaging |
| CN104067137A (en) * | 2011-12-23 | 2014-09-24 | 皇家飞利浦有限公司 | Mr imaging with suppression of flow artefacts |
| CN106233154A (en) * | 2014-04-22 | 2016-12-14 | 皇家飞利浦有限公司 | Use prepulsing and the nuclear magnetic resonance with motion correction of omniselector |
| CN107536610A (en) * | 2017-08-09 | 2018-01-05 | 济南市儿童医院（山东大学齐鲁儿童医院） | Thoracic cavity magnetic resonance examination device |
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| US6134464A (en) * | 1997-09-19 | 2000-10-17 | General Electric Company | Multi-slice and multi-angle MRI using fast spin echo acquisition |
| CN1845702A (en) * | 2003-09-05 | 2006-10-11 | 株式会社日立医药 | Magnetic resonance imaging method and device |
| CN101470178A (en) * | 2007-12-29 | 2009-07-01 | 西门子（中国）有限公司 | Method and apparatus for restraining residual motion artifact |
| CN104067137A (en) * | 2011-12-23 | 2014-09-24 | 皇家飞利浦有限公司 | Mr imaging with suppression of flow artefacts |
| US20130342202A1 (en) * | 2012-06-26 | 2013-12-26 | John P. Mugler, III | Magnetic resonance system and operating method for flow artifact reduction in slab selective space imaging |
| US20140077807A1 (en) * | 2012-09-19 | 2014-03-20 | Robert R. Edelman | System and method for imaging of vascular structures using non-contrast enhanced magnetic resonance imaging |
| CN106233154A (en) * | 2014-04-22 | 2016-12-14 | 皇家飞利浦有限公司 | Use prepulsing and the nuclear magnetic resonance with motion correction of omniselector |
| CN107536610A (en) * | 2017-08-09 | 2018-01-05 | 济南市儿童医院（山东大学齐鲁儿童医院） | Thoracic cavity magnetic resonance examination device |
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