CN107305242A - Coil device for finger magnetic resonance imaging - Google Patents
Coil device for finger magnetic resonance imaging Download PDFInfo
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- CN107305242A CN107305242A CN201610284205.6A CN201610284205A CN107305242A CN 107305242 A CN107305242 A CN 107305242A CN 201610284205 A CN201610284205 A CN 201610284205A CN 107305242 A CN107305242 A CN 107305242A
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- finger
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- magnetic resonance
- resonance imaging
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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
- G01R33/34007—Manufacture of RF coils, e.g. using printed circuit board technology; additional hardware for providing mechanical support to the RF coil assembly or to part thereof, e.g. a support for moving the coil assembly relative to the remainder of the MR system
-
- 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
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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
- G01R33/341—Constructional details, e.g. resonators, specially adapted to MR comprising surface coils
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Engineering & Computer Science (AREA)
- Medical Informatics (AREA)
- Biophysics (AREA)
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- High Energy & Nuclear Physics (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Radiology & Medical Imaging (AREA)
- Molecular Biology (AREA)
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- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
The invention discloses a kind of coil device for human finger magnetic resonance imaging, chassis including support palm and finger and the finger radio-frequency coil equipped with coil resonant circuit, chassis and finger radio-frequency coil select the coil of corresponding profile for the finger that different patients deform to be detachably connected.Described chassis is curved profile corresponding with human body palm and finger.The notch of a long strip type is provided with the top of finger radio-frequency coil, the patient of the feared state of mind is overcome, facilitates finger to pass in and out.Coil circuit is that two groups of square coils are constituted, and two coils share and are in series with adjustable condenser on same coil circuit, coil circuit.This invention addresses be not fixed easily during finger magnetic resonance examination and sweep time length difficulty, improve signal noise ratio (snr) of image, obtain the high-resolution MRI of finger.
Description
Technical field
The present invention relates to a kind of magnetic resonance imaging (MRI) technical field, specifically, it is related to radio-frequency coil in magnetic resonance imaging
Device, more particularly to human finger high-resolution imaging coil device.
Background technology
Magnetic resonance imaging (Magnetic Resonace Imaging MRI) is to utilize the proton in human body1H is in magnetic field
Resonance produces signal, a kind of technology for the imaging that undergoes reconstruction.The proton being excited progressively discharges the energy absorbed, uses
One radio-frequency coil comes out the energy measuring of release, referred to as free induction decay signal (Free Induction Decay
FID), then the atomic nucleus being excited progressively discharges the energy absorbed, and its phase and energy level are all returned to before exciting
State.And the energy signal for receiving these releases is to apply various radio-frequency coils.This signal contains the information of human body proton, is used for
Imaging.
As can be seen from the above radio-frequency coil plays a very important effect in magnetic resonance imaging system.He mainly uses
In transmitting RF pulses, free induction signal (FID) is received.The performance quality of coil directly affects the quality of image.
MRI is widely used in the diagnosis and therapeutic effect observation of disease.Hand rises in mankind's daily life and study and work
Very important key effect, hand it is healthy extremely important.Arthritis etc. be one involve based on periarticular it is chronic
The inflammatory autoimmune disease of multisystem.Finger-joint is earliest discovery disease happening part, generally from brothers little Guan
Section starts, and invades later and large joint, causes destruction of joint and fibrous ankylosis, cause the progressive in joint to destroy, deformity and work(
It can lose.
Magnetic resonance can clearly show that the basic pathology of finger-joint changes, and show that the early stage pathology of various lesions changes
Become, more other image methods have obvious advantage, and it is currently the optimal Image Examination of wrist portion lesion that MRI, which is,
Also very important effect is played in the antidiastole of various disease.
Because without special finger radio-frequency coil, studying less to finger-joint, mostly using the limbs of existing magnetic resonance
Coil, flexible surface coils, annular surface coil etc., it is described in following documents：[Chinese Journal of Radiology such as 1. Liu Min,
2009,43 (8), 867-871；The Mod such as 2.Tamai M Rheumatol, 2012,22 (5)：654-658；3.Jimenez-Boj
The Arthritis such as E Rheum, 2007,56 (4)：1118-1124].Because these coils are not finger coils specials, obtain not
To high-resolution MRI image, it is possible to miss Minor articulus lesion and change the best opportunity found.
In document [J Magn Reson Imaging.2010,31：240-247 and J Magn Reson
Imaging.2011,33 (1)：245-251] on, Kwok WE etc. develop finger-joint coil, a length of 12mm's of its diameter 29mm
The surface coils of one, can only once do an articulations digitorum manus, due to arthritic's finger may have different degrees of swelling and
Deformation, finger may not enter coil.More bad fixation, this two kinds of coils in-convenience in use.
On document [practical radiology magazine, 2016,32 (4), 128-135], coil used is two groups of coils up and down,
Due to having certain mutual inductance between the clinodactyly and two coils of arthritic etc., to the finger of different patients, coil
Signal to noise ratio (SNR) just has very big change.Picture quality has a great impact, and coil is not allowed to be fixed easily.
Invented in the utility model of [a kind of full hand line coil apparatus for Magnetic resonance imaging, the U of CN 204536520]
On, the full hand line circle of the composition of 8 coils is invented, 4 coils are used for palm part, and 4 coils are used for wrist portion in addition
Imaging, is only used for the imaging of palm and wrist portion, it is impossible to be used in human finger is imaged.In document [MAGMA.2012,25 (3)：
On 233-244], the 8 channel radio frequency coils and an internal diameter that the application internal diameter such as Herrmann KH is 35mm are 38mm volume radio frequency lines
Circle compares, and the SNR of 8 channel radio frequency coils is good not as the SNR of volume radio-frequency coil.
Finger structure complexity is, it is necessary to the MRI imaging coils of more high resolution.What therefore invention high-resolution finger was imaged penetrates
Early detection of the frequency coil to finger-joint disease has great importance.
The content of the invention
The present invention primarily to solve finger in finger magnetic resonance imaging be not fixed easily and sweep time length difficulty, it is special
It is not the problem of high-resolution magnetic resonance imaging.
The purpose of the present invention is exactly to have invented a kind of high-resolution radio-frequency coil of magnetic resonance finger easy to use.
Magnetic resonance radio frequency coil, it is desirable to have high SNR, in document [Revista Mexicana de Fiscica 2003,49
(2)：107-144.] in, R.Hernandez etc. describes SNR mathematical formulae, SNR ∝ ω0 2B1i-1Vsample/Reff, wherein
ω0For resonant frequency, Vsamp1For the volume of the voxel of sample, B1The horizontal linear polarizing magnetic field produced for coil current.ReffHave
Effect resistance is (4kT Δ f Rcoil)1/2, wherein Rcoi1It is electrolysed including coil conductibility and eddy-current loss, in addition to sample and surrounding
The loss of matter, T is the temperature of Imaged samples, and K is Boltzmann constant, the bandwidth of Δ f radio-frequency receiving systems.
In terms of the design aspect of coil, raising coil B is mainly in order to improve SNR1The intensity in magnetic field, can be coil more
Stick on nearly imaging region to increase B1Value, reduces coil R as far as possibleeffEffective resistance is the impedance of coil, reduces Rcoil, i.e., using damage
Consumption small conductor and device, and reduce the interference of the undesirable mutual electromagnetic inductance between coil.
Because the anatomical structure of finger is complicated, volume is smaller, and such as finger radio frequency coil designs use multi-channel coil, line
Circle is all concentrated in together, and electromagnetic interference typically passes through adjacent windings to reduce than more serious between interference, coil between coil
Partly overlap to realize, overlapping method is in patent [1. carotid artery coils, coil device and coil apparatus, CN 104375104
A；2. a kind of full hand line coil apparatus for Magnetic resonance imaging, the U of CN 204536520] in be described, can so add
The resistance R of coileff, lap generation image part it is uneven, imaged image quality.
In order to realize this goal of the invention, improved and required according to SNR, the present invention implements a kind of coil of two passages, in order to
Coil is more pressed close to finger, in order to reduce the interference of the undesirable mutual electromagnetic inductance between coil, two coils are shared into same coil circuit, this
Sample can reduce occasionally that the part of the generation image of coil lap is uneven due to needing to go.Coil circuit is fixed on
In the coil rack that ABS plastic is made, and slotted thereon, overcome the entrance for the patient's finger for having the feared state of mind.
The present invention also embodied in the finger radio-frequency coil of another arc-shaped bend, the patient of the deformation finger be conducive to
Finger more press close to coil, improve the SNR of MRI.
Finger radio-frequency coil is made up of the inner casing and shell of coil rack, and the shell of coil has a trapezoidal base, this
Sample can be conveniently closely with the chassis connection of coil palm.
The present invention also embodied in a kind of chassis of palm, using the arcuate structure for the palm configuration that can fit naturally, make palm
Can cosily it place very much, it is ensured that the correct placement of finger and scanning, it is one that a shell with coil is provided with the base of palm
Trapezoidal identical notch is planted, the coil of corresponding profile is selected for the finger that different patients deform.
Using finger radio-frequency coil to aqueous solution model and the magnetic resonance imaging of volunteer's finger, its flat resolution is less than
0.160mm2。
Brief description of the drawings
Fig. 1 is overall structure diagram of the invention.
Fig. 2 is finger radio-frequency coil structure schematic diagram of the invention.
Fig. 3 is the finger radio-frequency coil structure schematic diagram of arc-shaped bend.
Fig. 4 is finger radio-frequency coil Inside coil circuit and coil inner casing configuration schematic diagram of the invention.
The water model magnetic resonance imaging image of the application finger radio-frequency coil of Fig. 5 embodiments 1.
Fig. 6 is the experiment curv that Fig. 5 is embodiment 1 coronal image left and right directions (RL) signal to noise ratio.
Fig. 7 is the experiment curv that Fig. 5 is embodiment 1 coronal image fore-and-aft direction (IS) signal to noise ratio.
Fig. 8 embodiments 2 are volunteer's right hand middle finger coronal-plane magnetic resonance imaging image.
Fig. 9 embodiments 3 are rheumatoid arthritis volunteer's right hand forefinger coronal-plane magnetic resonance imaging image.
In figure：1. the trapezoidal base of coil；2. coil inner casing；3. coil case；4. coil notch；5. chassis trapezoidal notch；
6. the chassis arc-shaped curved surface of chassis 7.；8. coil line.
Embodiment
The embodiment of the present invention is described below in conjunction with the accompanying drawings.
Such as the radio-frequency coil of the finger magnetic resonance imaging of Fig. 1 present invention, there is the support chassis (6) of palm and humorous equipped with coil
Shake circuit finger radio-frequency coil constitute (1,2,3,4).
Finger radio-frequency coil such as Fig. 2 and 3, is connected by the shell (3) of the inner casing (2) equipped with coil circuit, coil with coil
Trapezoidal base (1), it matches with the trapezoidal notch (5) opened on chassis.
Chassis (6) is designed with the arc-shaped curved surface (7) of support palm.The chassis of palm and the inside and outside shell of coil are ABS modelings
Material is made.It is provided with the chassis of palm in a trapezoidal notch Fig. 1 (5).Finger coil for different model comes in and goes out (because not
Finger with patient is variant, some clinodactylies), it is necessary to use different coils, such as Fig. 3 is exactly one kind of winding arc
Finger radio-frequency coil.
Fig. 4 is coil inner casing (2), includes coil line (8), coil is two groups of mutually isostructural coils, by two coils
Share and adjustable condenser is in series with same coil circuit, coil circuit, two coils are " day " font structure, by flexible circuit
Plate is made, and is packaged on coil inner casing (2), coil tuning circuit and removes undesirable mutual electromagnetic inductance circuit, is placed on the base (1) of coil
In.
Circuit etc., which is matched, used in the radio frequency protection circuit and reception magnetic resonance signal (FID) of finger radio-frequency coil is placed on bottom
In disk (6).
The trapezoidal base (1) of finger radio-frequency coil is inserted in chassis trapezoidal notch (5) during scanning, can be according to different patients
Finger select different finger coils, patient can use prone position, and hand is flat to be lifted over the top of the head, and pronation places chassis, finger
It is put into finger radio-frequency coil；Also dorsal position can be used, body both sides are manually placed at, pronation is placed on chassis, finger
It is put into finger radio-frequency coil.
The syringe that embodiment 1 is about 20mm with a diameter fills water and makees model, for simulating the load of a finger.
Using GE signa 1.5T HDxt MRI scanners, finger finger radio-frequency coil is swept using the finger radio-frequency coil shown in Fig. 2
Retouching sequence is：
If Fig. 5 is water model coronal image along Fig. 5 two orthogonal several left and right directions (RL) and front and back
To (IS), SNR, ROI a diameter of 2mm are surveyed at interval of 2mm.Such as Fig. 6 is left and right directions (RL), such as Fig. 7 fore-and-aft directions (IS), can
To find out picture signal than more uniform, SNR is higher.
The volunteer's right hand middle finger of embodiment 2, volunteer prone position during scanning, hand is flat to be lifted over the top of the head, and pronation is placed on
On the palm chassis of finger radio-frequency coil, scanning device and sequence be the same as Example 1.Such as Fig. 8 is coronal image, and articulation structure is clear
Clear, flat resolution is 0.156 × 0.130mm2。
The RA volunteer's right hand forefinger of embodiment 3, volunteer's dorsal position during scanning is manually placed at body both sides, pronation
It is placed on the palm base of finger radio-frequency coil, scanning device and sequence be the same as Example 1, the finger of the arc-shaped bend of application drawing 3
Radio-frequency coil, such as Fig. 9 are coronal image, it is seen that finger has certain flexural deformation, and synovium of joint is thickened.Flat resolution is
0.156×0.156mm2。
Claims (7)
1. a kind of coil device for finger magnetic resonance imaging, including support palm and finger chassis and equipped with coil
The finger radio-frequency coil of circuit.It is characterized in that：Described finger radio-frequency coil is the radio-frequency coil of a wrapping finger, coil line
Road is packaged on coil inner casing；Described finger radio-frequency coil is that two groups of coils are constituted.
2. the coil device of finger magnetic resonance imaging according to claim 1, it is characterized in that：Finger radio-frequency coil is
The cylinder of the notch of a long strip type is provided with an upper portion thereof or cylindrical for arc-shaped bend, overcome the patient for having the feared state of mind,
Finger is facilitated to pass in and out.
3. the coil device of finger magnetic resonance imaging according to claim 1 or 2, it is characterized in that：Chassis and finger
Radio-frequency coil is to be detachably connected.
4. the coil device of finger magnetic resonance imaging according to claim 1 or 2, it is characterized in that：Finger radio frequency line
Coil apparatus is trapezoidal base.
5. the coil device of finger magnetic resonance imaging according to claim 1, it is characterized in that：One is provided with chassis
Trapezoidal notch.
6. the coil device of finger magnetic resonance imaging according to claim 1, it is characterized in that：Chassis be with outside palm
The corresponding cambered surface profile of shape.So that hand can carry out magnetic resonance imaging as snug as a bug in a rug.
7. the coil device of the finger magnetic resonance imaging according to claim 1,2, it is characterized in that：Two groups of square coils
Same coil circuit is shared, adjustable condenser is in series with coil circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610284205.6A CN107305242A (en) | 2016-04-25 | 2016-04-25 | Coil device for finger magnetic resonance imaging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610284205.6A CN107305242A (en) | 2016-04-25 | 2016-04-25 | Coil device for finger magnetic resonance imaging |
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| Publication Number | Publication Date |
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| CN107305242A true CN107305242A (en) | 2017-10-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610284205.6A Pending CN107305242A (en) | 2016-04-25 | 2016-04-25 | Coil device for finger magnetic resonance imaging |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112075935A (en) * | 2020-11-13 | 2020-12-15 | 山东奥新医疗科技有限公司 | Limb superconducting magnetic resonance imaging system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0265845A (en) * | 1988-09-01 | 1990-03-06 | Toshiba Corp | Magnetic resonance imaging apparatus |
| US7394256B2 (en) * | 2005-11-23 | 2008-07-01 | Koninklijke Philips Electronics N.V. | Wrist coil for magnetic resonance imaging |
| CN102288928A (en) * | 2011-08-03 | 2011-12-21 | 深圳市特深电气有限公司 | Radio frequency coil device for magnetic resonance imaging system |
| CN202886578U (en) * | 2012-09-28 | 2013-04-17 | 上海联影医疗科技有限公司 | Wrist coil apparatus used for magnetic resonance imaging device |
-
2016
- 2016-04-25 CN CN201610284205.6A patent/CN107305242A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0265845A (en) * | 1988-09-01 | 1990-03-06 | Toshiba Corp | Magnetic resonance imaging apparatus |
| US7394256B2 (en) * | 2005-11-23 | 2008-07-01 | Koninklijke Philips Electronics N.V. | Wrist coil for magnetic resonance imaging |
| CN102288928A (en) * | 2011-08-03 | 2011-12-21 | 深圳市特深电气有限公司 | Radio frequency coil device for magnetic resonance imaging system |
| CN202886578U (en) * | 2012-09-28 | 2013-04-17 | 上海联影医疗科技有限公司 | Wrist coil apparatus used for magnetic resonance imaging device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112075935A (en) * | 2020-11-13 | 2020-12-15 | 山东奥新医疗科技有限公司 | Limb superconducting magnetic resonance imaging system |
| CN112075935B (en) * | 2020-11-13 | 2021-02-19 | 山东奥新医疗科技有限公司 | Limb superconducting magnetic resonance imaging system |
| WO2022100478A1 (en) * | 2020-11-13 | 2022-05-19 | 山东奥新医疗科技有限公司 | Superconducting magnetic resonance imaging system for limb |
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Application publication date: 20171031 |