CN109425842A - The coil selection method and MR imaging apparatus of MR imaging apparatus - Google Patents
The coil selection method and MR imaging apparatus of MR imaging apparatus Download PDFInfo
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- CN109425842A CN109425842A CN201710771066.4A CN201710771066A CN109425842A CN 109425842 A CN109425842 A CN 109425842A CN 201710771066 A CN201710771066 A CN 201710771066A CN 109425842 A CN109425842 A CN 109425842A
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- coil
- unit group
- coil unit
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- 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
Abstract
The present invention provides the coil selection method and MR imaging apparatus of a kind of MR imaging apparatus, comprising: multiple coil units in each coil relevant to imaging region of MR imaging apparatus are grouped as multiple coil unit groups；Prescan is carried out using a part of coil unit group selected from the multiple coil unit group, and obtains corresponding magnetic resonance echo signals；The signal-to-noise ratio of the corresponding each magnetic resonance echo signals obtained using prescan is calculated for a part of coil unit group；It will be determined as formally scanning the coil unit group used with coil unit group corresponding to the optimal signal-to-noise ratio that is calculated.Coil selection method according to the present invention and MR imaging apparatus can efficiently and accurately select the coil unit group for magnetic resonance imaging.
Description
Technical field
The present invention relates to the coil selection methods and MR imaging apparatus of a kind of MR imaging apparatus.
Background technique
It is for example logical using RF coil device (radio frequency coil device) in MR imaging apparatus
Crossing makes RF pulse current flow through coil etc. and send RF pulse to nuclear spin and believe the echo-signal occurred as MR
It number is received.There are the body coil and local local coil of whole body in RF coil device.RF coil dress locally
It sets and accordingly uses various devices with shooting position, such as in the shooting of lower limb, the dedicated RF coil device of lower limb is installed on
The lower limb of subject.
In RF coil device, such as multiple coil parts that configuration plays a role as the antenna for detecting MR signal.
Each coil part (group) within shooting preparation stage, such as display RF coil device, the coil by user's selection for shooting
Element (group).When selection is used for the coil part of shooting, the position of coil part is important.
Thus, in order to accurately obtain the position of coil part (group), patent document 1 discloses a kind of coil selection method,
Wherein emitting a RF signal and obtaining indicates that the space analysis data of the signal intensity profile of coil can be used, and true according to the data
The three-dimensional exposure distribution figure (exposure profile) of fixed each coil, according to the selection of the scanning area of detected body for into
The coil of row magnetic resonance imaging.
The open Pre-Evaluation value according to magnetic resonance signal intensity of patent document 2 is to select coil unit and according to from selection
Signal that coil unit receives generates image.
Patent document 3 discloses a coil selection processor, is determined according to the relationship between coil and remaining coil excellent
First grade, and a part of subcoil group is selected using the priority level delimited.
Patent document
Patent document 1:US20050275402,
Patent document 2:US20070210793,
Patent document 3:US20140002083,
Summary of the invention
In view of this, the invention proposes a kind of coils (group) for efficiently and accurately selecting for magnetic resonance imaging
Method and apply the MR imaging apparatus of this method.
One embodiment of the invention provides a kind of coil selection method of MR imaging apparatus comprising: by magnetic resonance
Multiple coil units in each coil relevant to imaging region of imaging device are grouped as multiple coil unit groups；Using from
A part of coil unit group selected in the multiple coil unit group carries out prescan, and obtains corresponding magnetic resonance echoes letter
Number；The letter of the corresponding each magnetic resonance echo signals obtained using prescan is calculated for a part of coil unit group
It makes an uproar ratio；It will be determined as formally scanning the coil unit used with coil unit group corresponding to the optimal signal-to-noise ratio that is calculated
Group.
In above-mentioned coil selection method, preferably by the coil unit according to the area classifying be overlapped with imaging region into
Row grouping.
In above-mentioned coil selection method, preferably described a part of coil unit group is joined by the scanning of magnetic resonance imaging
Number selects to obtain from the multiple coil unit group.
It is each in a part of coil unit group preferably in the prescan in above-mentioned coil selection method
A coil unit group only receives a magnetic resonance echo signals.
In above-mentioned coil selection method, the sweep parameter of the preferably described magnetic resonance imaging is that integrated parallel acquisition technique exists
The factor in acceleration direction.
Another embodiment of the present invention provides a kind of MR imaging apparatus, has: central control, by magnetic resonance at
As device each coil relevant to imaging region in multiple coil units be grouped as multiple coil unit groups；Prescan control
Portion processed stores the multiple coil unit group, and utilizes a part of coil unit selected from the multiple coil unit group
Group carries out prescan, and obtains corresponding magnetic resonance echo signals；Calculation part calculates benefit for a part of coil unit group
With the signal-to-noise ratio for corresponding each magnetic resonance echo signals that prescan obtains；Determining section, by with the optimal letter that is calculated
It makes an uproar and is determined as formally scanning the coil unit group used than corresponding coil unit group.
In above-mentioned MR imaging apparatus, preferably in prescan control unit, a part of coil unit group is logical
The sweep parameter for crossing magnetic resonance imaging selects to obtain from the multiple coil unit group.
In above-mentioned MR imaging apparatus, preferably in the prescan, a part of coil unit group of selection
Each of coil unit group only receive a magnetic resonance echo signals.
According to the coil selection method of aforementioned present invention and apply the MR imaging apparatus of this method, can effectively and
Accurately selection is used for the coil (group) of magnetic resonance imaging
Detailed description of the invention
Below will detailed description of the present invention preferred embodiment by referring to accompanying drawing, make those skilled in the art more
Clear above and other feature and advantage of the invention, in attached drawing:
Fig. 1 is a kind of flow chart of the coil selection method of MR imaging apparatus of the present invention.
Fig. 2 is the explanatory diagram being grouped to coil unit.
Fig. 3 is the explanatory diagram that the magnetic resonance signal received to coil unit group is handled.
Fig. 4 is the explanatory diagram using the MR imaging apparatus of the coil selection method of the present embodiment.
Wherein, appended drawing reference is as follows:
10, central control；
20, prescan control unit；
22, calculation part；
23 determining sections；
C1, C2, C3, C4 coil；
C11, C12, C13 coil unit；
C21, C22, C23 coil unit；
C31, C32, C33 coil unit；
C41, C42, C43 coil unit.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, by the following examples to of the invention further detailed
It describes in detail bright.
Herein, " schematic " expression " serving as examplea, instances, or illustrations " should not will be described herein as " showing
Any diagram, the embodiment of meaning property " are construed to technical solution that is a kind of preferred or more having advantages.
To make simplified form, part related to the present invention is only schematically shown in each figure, they are not represented
Its practical structures as product.In addition, to be easy to understand simplified form, with identical structure or function in some figures
Component only symbolically depicts one of those, or has only marked one of those.
Preferred embodiment of the present invention will be described with reference to the accompanying drawings.
Fig. 1 is a kind of flow chart of the coil selection method of MR imaging apparatus of the present invention.
As shown in Figure 1, according to the coil selection method of the present embodiment, first by MR imaging apparatus and imaging region
Multiple coil units in relevant each coil are grouped as multiple coil unit groups (S101).
When being scanned imaging to detected body using MR imaging apparatus, need using multiple coil C1, C2,
C3, C4 etc., and each coil separately includes multiple coil units, such as in the present embodiment, as shown in Fig. 2, coil C1 packet
Include coil unit C11, C12, C13, coil C2 includes coil unit C21, C22, C23, coil C3 include coil unit C31,
C32, C33, coil C4 include coil unit C41, C42, C43.
When being intended to that imaging region FOV therein is imaged, coil unit relevant to imaging region FOV is divided into
Group.Here, coil unit can be grouped according to the overlapping area of coil unit and imaging region FOV, for example, in this reality
It applies in example, ratio shared by the overlapping area of coil unit C22, C32 and imaging region FOV is 100%, coil unit C21,
Ratio shared by the overlapping area of C31 and imaging region FOV is 33% ....
Coil unit group 1={ C22, C32 }；
Coil unit group 2={ C21, C22, C31, C32 }；
Coil unit group 3={ C21, C22, C31, C32, C41, C42 }；
Coil unit group 4={ C21, C22, C31, C32, C41, C42, C23, C33 }；
……。
Back to Fig. 1, after being grouped to coil unit relevant to imaging region FOV, using from multiple coils
A part of coil unit group selected in unit group (coil unit group 1,2,3,4 ...) carries out prescan, and obtains corresponding
Magnetic resonance echo signals (S102).
Specifically, it is selected from coil unit groups multiple after above-mentioned division by the sweep parameter of magnetic resonance imaging
It selects, such as use IPAT (Integrated Parallel Acquisition Techniques: integrated parallel acquisition skill
Art) when carrying out magnetic resonance imaging, the coil unit number in IPAT acceleration direction has to be larger than equal to the IPAT factor, and citing comes
It says, when being 2 progress data acquisition with the factor in the X-direction of Fig. 2 using IPAT technology, the coil unit number in X-direction must
2 must be more than or equal to, therefore, only the coil unit group 1 with coil unit C22, a C32 is excluded in the X direction, remaining
Coil unit group be used for prescan.Next, prescan is carried out using the coil unit group after selection, in prescan,
One coil unit group only receives a magnetic resonance echo signals, receives next magnetic by next coil unit group immediately later
Resonance echo signal.
In turn, the coil unit group obtained for selection is calculated to be believed using corresponding each magnetic resonance echoes that prescan obtains
Number signal-to-noise ratio (S103).Fig. 3 is the explanatory diagram that the magnetic resonance signal received to coil unit group is handled.It is specific next
It says, as shown in figure 3, each coil unit in coil unit group k receives signal Sk1, Sk2 ... ... Skm holds above-mentioned signal
The one-dimensional Fast Fourier Transform (FFT) (1-D FFT) of row, then synthesizes transformed signal, and then calculate the coil unit
The signal-to-noise ratio (SNR) for the magnetic resonance signal that group obtains.
Finally, by coil unit group corresponding to the optimal signal-to-noise ratio being calculated, such as coil unit group k determination is positive
Formula scans the coil unit group (S104) used.
According to the selection method of the coil unit group of the present embodiment, the coil unit of optimum signal-noise ratio can be rapidly selected
Group.
Fig. 4 is the explanatory diagram using the MR imaging apparatus of the coil selection method of the present embodiment.
As shown in figure 4, MR imaging apparatus 1 have central control 10, prescan control unit 20, calculation part 22, really
Determine portion 23.Central control 10 is, for example, the central processing unit of MR imaging apparatus, will be related to imaging region FOV
Each coil in multiple coil units be divided into multiple coil unit groups.Prescan control unit 20 is, for example, magnetic resonance imaging dress
The coil control unit set stores above-mentioned multiple coil unit groups in its storage unit 21.And using described in above-mentioned Fig. 1
Method, a part of coil unit group for selecting from multiple coil unit groups carries out prescan, and obtains corresponding magnetic resonance
Echo-signal.In addition, being also equipped with calculation part 22 and determining section 23 in prescan control unit 20, calculation part 22 is directed to and selection
The corresponding each magnetic resonance echo signals of a part of coil unit calculate signal-to-noise ratio.Determining section 23 by with the optimal noise that is calculated
It is determined as formally scanning the coil unit group used than corresponding coil unit group.
According to the MR imaging apparatus of the present embodiment, the storage coil unit group in prescan control unit 20 can be fast
Prescan is carried out fastly, and calculates the optimal coil unit group of determining signal-to-noise ratio as formally scanning the coil unit group used.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of coil selection method of MR imaging apparatus characterized by comprising
Multiple coil units in each coil relevant to imaging region of MR imaging apparatus are grouped as multiple coils
Unit group；
Prescan is carried out using a part of coil unit group selected from the multiple coil unit group, and obtains corresponding magnetic
Resonance echo signal；
The corresponding each magnetic resonance echo signals obtained using prescan are calculated for a part of coil unit group
Signal-to-noise ratio；
It will be determined as formally scanning the coil unit group used with coil unit group corresponding to the optimal signal-to-noise ratio that is calculated.
2. coil selection method according to claim 1, which is characterized in that
The coil unit is grouped according to the area classifying be overlapped with imaging region.
3. coil selection method according to claim 1, which is characterized in that
A part of coil unit group is selected from the multiple coil unit group by the sweep parameter of magnetic resonance imaging
It obtains.
4. coil selection method according to claim 1, which is characterized in that
In the prescan, each of described a part of coil unit group coil unit group only receives a magnetic resonance and returns
Wave signal.
5. coil selection method according to claim 3, which is characterized in that
The sweep parameter of the magnetic resonance imaging is the integrated factor of the parallel acquisition technique in acceleration direction.
6. a kind of MR imaging apparatus, which is characterized in that have:
Multiple coil units in each coil relevant to imaging region of MR imaging apparatus are grouped by central control
At multiple coil unit groups；
Prescan control unit stores the multiple coil unit group, and utilizes one selected from the multiple coil unit group
Coil sections unit group carries out prescan, and obtains corresponding magnetic resonance echo signals；
Calculation part calculates the corresponding each magnetic resonance echoes obtained using prescan for a part of coil unit group
The signal-to-noise ratio of signal；
Determining section will be determined as formally scanning the coil used with coil unit group corresponding to the optimal signal-to-noise ratio that is calculated
Unit group.
7. MR imaging apparatus according to claim 6, which is characterized in that
In prescan control unit, a part of coil unit group is by the sweep parameter of magnetic resonance imaging from the multiple
Selection obtains in coil unit group.
8. MR imaging apparatus according to claim 6, which is characterized in that
In the prescan, each of described a part of coil unit group of selection coil unit group only receives a magnetic
Resonance echo signal.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112834968A (en) * | 2019-11-25 | 2021-05-25 | 通用电气精准医疗有限责任公司 | Scanning control system and method for magnetic resonance imaging system |
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