CN105615882A - Magnetic resonance imaging method - Google Patents
Magnetic resonance imaging method Download PDFInfo
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- CN105615882A CN105615882A CN201410605172.1A CN201410605172A CN105615882A CN 105615882 A CN105615882 A CN 105615882A CN 201410605172 A CN201410605172 A CN 201410605172A CN 105615882 A CN105615882 A CN 105615882A
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Abstract
The invention provides a magnetic resonance imaging method. The magnetic resonance imaging method comprises that a space saturation method and a frequency saturation method are executed to limit the frequency of a nonlinear region gradient field and the frequency of a non-homogeneous region magnetostatic field to a region-of-interest of a target object to be imaged; and the region-of-interest is scanned to obtain the image of the region-of-interest. Thus, peripheral zone signal artifact in the obtained image can be reduced. Furthermore, the bandwidth of a radio-frequency field used for the space saturation method and the frequency saturation method can be reduced, radio-frequency emission energy and human body absorption energy can be reduced at the same time, the scanning time is shortened, and the magnetic resonance imaging efficiency can be improved.
Description
Technical field
The present invention relates to a kind of MR imaging method.
Background technology
Nuclear magnetic resonance (MRI) system generally includes the main magnet for producing magnetostatic field (B0 field), for producing the gradient coil of gradient fields, for producing the radio-frequency coil of radio-frequency field and for receiving the receiving coil of the magnetic resonance signal from destination object to be imaged.
The image obtained by MRI system can be comprised by the different former multiple artifacts (Artifact) thus resulted in. Such as, outer in the scope of the area-of-interest of destination object and what imaging region signal same frequency signal produced artifact is commonly called peripheral zone signal artifact (Annefact). Wherein, occurring that in fast spin echo sagittal/coronalplane (FSESag/CorPlane) imaging relatively more peripheral zone signal artifacts are rendered as bright spot form (StarIntensity) more, the appearance of such artifact (StarIntensity) is because the uniformity of B0 field and the linearly bad of gradient fields thus creating the pixel that brightness is very high.
Summary of the invention
The exemplary embodiment of the present invention aim to overcome that of the prior art above-mentioned and/or other problem. Therefore, the exemplary embodiment of the present invention provides a kind of MR imaging method that can reduce peripheral zone signal artifact.
According to exemplary embodiment, MR imaging method includes: performs space saturation process and frequency saturation process and the frequency of nonlinear gradient field and the frequency of non-homogeneous magnetostatic field is suppressed in the scope of the area-of-interest of destination object to be imaged; Area-of-interest is scanned, to obtain the image of area-of-interest. It is thereby possible to reduce for the bandwidth of space saturation process and the radio-frequency field of frequency saturation process, reduce transmitting and the absorption of energy, shorten sweep time, increase the efficiency of nuclear magnetic resonance.
By detailed description below, accompanying drawing and claim, other features and aspect can be made apparent from.
Accompanying drawing explanation
Exemplary embodiment for the present invention is described in conjunction with the drawings, it is possible to be more fully understood that the present invention, in the accompanying drawings:
Fig. 1 shows the flow chart of the MR imaging method according to exemplary embodiment;
(A) in Fig. 2 is respectively illustrate the image obtained according to existing MR imaging method and the diagram of image that the MR imaging method according to exemplary embodiment obtains to (C).
Detailed description of the invention
The specific embodiment of the present invention explained below, it should be pointed out that in the specific descriptions process of these embodiments, in order to carry out brief and concise description, all features of actual embodiment can not all be done detailed description by this specification. It should be appreciated that; in the actual implementation process of any one embodiment; as in the process of any one engineering project or design object; in order to realize the objectives of developer; in order to meet the restriction that system is relevant or business is relevant; usually can make various concrete decision-making, and this also can change from a kind of embodiment to another embodiment. In addition, it will also be appreciated that, although effort done in this development process is probably complicated and tediously long, but for those of ordinary skill in the art relevant to present disclosure, some designs carried out on the basis of the technology contents of disclosure exposure, manufacture or production etc. changes simply conventional technological means, is not construed as content of this disclosure insufficient.
Unless otherwise defined, the technical term or the scientific terminology that use in claims and description should be in the technical field of the invention and have the ordinary meaning that the personage of general technical ability understands. " first ", " second " that use in present patent application description and claims and similar word are not offered as any order, quantity or importance, and are used only to distinguish different ingredients. The similar word such as " one " or " one " is not offered as quantity restriction, and indicates that and there is at least one. " include " or the similar word such as " comprising " mean to occur in " including " or " comprising " before element or object contain the element or object and equivalent element thereof that occur in " including " or " comprising " presented hereinafter, it is not excluded that other elements or object. " connection " or " being connected " etc., similar word was not limited to physics or machinery connection, is also not necessarily limited to direct or indirectly connects.
Fig. 1 shows the flow chart of the MR imaging method according to exemplary embodiment.
As shown in fig. 1, it is possible, firstly, to perform space saturation process and frequency saturation process (S110). Can by performing space saturation process by the frequency suppression of gradient fields at destination object to be imaged (such as, patient) area-of-interest (FOV) scope in, it is possible to by performing frequency saturation process, the frequency of magnetostatic field (B0 field) is suppressed in the scope of the area-of-interest of destination object.
Specifically, it is possible to by performing space saturation process, the frequency of gradient fields is suppressed in the scope of area-of-interest, it is possible to by performing frequency saturation process, the frequency of magnetostatic field is suppressed in the scope of area-of-interest. Such as, when performing space saturation process, it is possible to coordinate gradient to select, by experiment or emulation, it is determined that space is saturated to be needed suppress the position of signal and suppress the scope of signal; When perform frequency saturation process time, it is possible to by experiment or emulation, it is determined that the frequency range of frequency strobe pulse.
Here, the execution sequence of space saturation process and frequency saturation process can be unrestricted, for instance, it is possible to space saturation process is first carried out, then performs frequency saturation process, or, it is possible to frequency saturation process is first carried out, then performs space saturation process.
By performing space saturation process and frequency saturation process, it is possible to reduce peripheral zone signal artifact (such as, Starintensity artifact), it is possible to reduce for performing space saturation process and the bandwidth BW of frequency saturation process. In one exemplary embodiment, the bandwidth BW of the radio-frequency field for performing space saturation process and frequency saturation process can meet following formula:
BW=BWB0+2��BWGrad,
In formula, BWB0For the bandwidth of magnetostatic field, BWGradBandwidth for gradient fields.
Non-uniform B 0 superposes with gradient fields at gradient fields nonlinear area, has significantly high frequency bandwidth. Therefore, if only using saturation pulse to suppress, then the bandwidth needing saturation pulse is sufficiently large. But, according to exemplary embodiment, it is possible to the gradient fields of inelastic region and Non-uniform B 0 are carried out individual processing, thus each of which desire bandwidth is only small just can meet inhibition. In other words, the space of the execution respectively saturation process of exemplary embodiment is relative with frequency saturation process can reduce radio-frequency field desire bandwidth with prior art.
In existing method, only perform space saturation process and reduce peripheral zone signal artifact. In this case, for performing the bandwidth BW of the radio-frequency field of space saturation processSpSat_OnlyNeed to meet following formula:
BWSpSat_Only��2��(BWB0+BWGrad)��
What was certain was that, compared with the method reducing peripheral zone signal artifact according to existing only execution space saturation process, according to exemplary embodiment perform space saturation process and frequency saturation process reduce the bandwidth of the radio-frequency field that the method for peripheral zone signal artifact adopts can be less, for example, it is possible to be 6kHz.
It is then possible to area-of-interest is scanned, it is possible to finally give the image (S130) of area-of-interest. Here it is possible to adopt the operation identical with existing resonance imaging operations well known by persons skilled in the art, therefore, will omit and be described in detail.
But, exemplary embodiment is not limited to this, and in other exemplary embodiment, MR imaging method performs the step of Classical method before being additionally may included in the step that area-of-interest is scanned. Here, Classical method is a kind of suppression peripheral zone signal artifact technology being used for spin-echo sequence, wherein, returns poly-by making the issuable artifact signal of excitation pulse do not returned poly-pulse, thus removing artifact.
(A) in Fig. 2 is respectively illustrate the image obtained according to existing MR imaging method and the diagram of image that the MR imaging method according to exemplary embodiment obtains to (C).
(A) in Fig. 2 does not carry out suppressing and obtaining image, wherein, shows obvious artifact in image. (B) in Fig. 2 is the image obtained according to prior art using space saturation process to carry out suppressing, and wherein, peripheral zone signal artifact can largely be suppressed, but the radio frequency bandwidth used is very big, generally wants more than 10kHz. (C) in Fig. 2 is the image obtained by performing frequency saturation process and space saturation process and suppressing artifact according to exemplary embodiment, and wherein, the radio frequency bandwidth of use has only to 6kHz, and has reached good artifact inhibition. Therefore, can suppress the frequency of nonlinear gradient field the frequency of non-homogeneous magnetostatic field to be suppressed in the scope of area-of-interest in the scope of area-of-interest and by performing frequency saturation process respectively through performing space saturation process according to the MR imaging method of exemplary embodiment. Additionally, because performing space saturation process and frequency saturation process, it is possible to reduce the bandwidth of the radio-frequency field for every kind of method. In addition by reducing the bandwidth of the radio-frequency field for every kind of method, reduce and launch and absorb energy, shorten the operating time, increase the efficiency of nuclear magnetic resonance.
It is described above some exemplary embodiments. It should be understood, however, that various modifications may be made. Such as, if if described technology is executed in different order and/or assembly in described system, framework, equipment or circuit is combined by different way and/or is substituted by other assembly or its equivalent or supplements, then suitable result can be realized. Correspondingly, other embodiments also fall in scope of the claims.
Claims (3)
1. a MR imaging method, it is characterised in that described method includes:
Perform space saturation process and frequency saturation process the frequency of inelastic region gradient fields and the frequency of non-uniform area magnetostatic field to be suppressed in the scope of the area-of-interest of destination object to be imaged;
Area-of-interest is scanned, to obtain the image of area-of-interest.
2. MR imaging method as claimed in claim 1, it is characterised in that
Step is suppressed to include:
Perform space saturation process, the frequency of gradient fields to be suppressed in the scope of area-of-interest;
Perform frequency saturation process, so that the frequency of magnetostatic field is suppressed in the scope of area-of-interest,
Wherein, the bandwidth for performing space saturation process and frequency saturation process meets following formula
BW=BWB0+2��BWGrad,
Wherein, BW is the bandwidth of the radio-frequency field for performing space saturation process and frequency saturation process, BWB0For the bandwidth of magnetostatic field, BWGradBandwidth for gradient fields.
3. MR imaging method as claimed in claim 1, it is characterised in that
Step is suppressed to include:
Perform frequency saturation process, the frequency of magnetostatic field to be suppressed in the scope of area-of-interest;
Perform space saturation process, so that the frequency of gradient fields is suppressed in the scope of area-of-interest,
Wherein, the bandwidth of the radio-frequency field for performing space saturation process and frequency saturation process meets following formula
BW=BWB0+2��BWGrad,
Wherein, BW is the bandwidth for space saturation process and the radio-frequency field of frequency saturation process, BWB0For the bandwidth of magnetostatic field, BWGradBandwidth for gradient fields.
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| CN201410605172.1A CN105615882A (en) | 2014-10-31 | 2014-10-31 | Magnetic resonance imaging method |
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| CN201410605172.1A CN105615882A (en) | 2014-10-31 | 2014-10-31 | Magnetic resonance imaging method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107137083A (en) * | 2017-06-16 | 2017-09-08 | 上海联影医疗科技有限公司 | A kind of magnetic resonance scanning method, system and computer-readable recording medium |
| CN110507326A (en) * | 2019-08-30 | 2019-11-29 | 上海联影医疗科技有限公司 | Magnetic resonance imaging control method, system and magnetic resonance system |
| CN110554338A (en) * | 2018-05-31 | 2019-12-10 | 通用电气公司 | Method and system for coil selection in magnetic resonance imaging to reduce ANNEFACT artifacts |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050248342A1 (en) * | 2004-05-05 | 2005-11-10 | Baker Hughes Incorporated | Reduction of motion artifacts in NMR |
| CN1829291A (en) * | 2004-12-01 | 2006-09-06 | 三菱电机株式会社 | Sensing apparatus, method for sensing energy field and camera |
| US20100301860A1 (en) * | 2009-04-03 | 2010-12-02 | New York University | System, method and computer-accessible medium for providing breath-hold multi-echo fast spin-echo pulse sequence for accurate r2 measurement |
| US20130278258A1 (en) * | 2012-04-19 | 2013-10-24 | University Of Southern California | Method for reduced field of view mri in an inhomogeneous field with rapid outer volume suppression |
-
2014
- 2014-10-31 CN CN201410605172.1A patent/CN105615882A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050248342A1 (en) * | 2004-05-05 | 2005-11-10 | Baker Hughes Incorporated | Reduction of motion artifacts in NMR |
| WO2005109038A2 (en) * | 2004-05-05 | 2005-11-17 | Baker Hughes Incorporated | Reduction of motion artifacts in nmr |
| CN1829291A (en) * | 2004-12-01 | 2006-09-06 | 三菱电机株式会社 | Sensing apparatus, method for sensing energy field and camera |
| US20100301860A1 (en) * | 2009-04-03 | 2010-12-02 | New York University | System, method and computer-accessible medium for providing breath-hold multi-echo fast spin-echo pulse sequence for accurate r2 measurement |
| US20130278258A1 (en) * | 2012-04-19 | 2013-10-24 | University Of Southern California | Method for reduced field of view mri in an inhomogeneous field with rapid outer volume suppression |
Non-Patent Citations (1)
| Title |
|---|
| 彭俊玲等: "饱和成像技术的原理及临床应用", 《中国中西医结合影像学杂志》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107137083A (en) * | 2017-06-16 | 2017-09-08 | 上海联影医疗科技有限公司 | A kind of magnetic resonance scanning method, system and computer-readable recording medium |
| CN107137083B (en) * | 2017-06-16 | 2020-05-15 | 上海联影医疗科技有限公司 | Magnetic resonance scanning method, system and computer readable storage medium |
| US11079449B2 (en) | 2017-06-16 | 2021-08-03 | Shanghai United Imaging Healthcare Co., Ltd. | Systems and methods for magnetic resonance scanning |
| US11796611B2 (en) | 2017-06-16 | 2023-10-24 | Shanghai United Imaging Healthcare Co., Ltd. | Systems and methods for magnetic resonance scanning |
| CN110554338A (en) * | 2018-05-31 | 2019-12-10 | 通用电气公司 | Method and system for coil selection in magnetic resonance imaging to reduce ANNEFACT artifacts |
| CN110554338B (en) * | 2018-05-31 | 2022-01-28 | 通用电气公司 | Method and system for coil selection in magnetic resonance imaging to reduce ANNEFACT artifacts |
| CN110507326A (en) * | 2019-08-30 | 2019-11-29 | 上海联影医疗科技有限公司 | Magnetic resonance imaging control method, system and magnetic resonance system |
| CN110507326B (en) * | 2019-08-30 | 2022-12-27 | 上海联影医疗科技股份有限公司 | Magnetic resonance scanning control method and system and magnetic resonance system |
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