CN112394309B - Local coil, method of manufacturing the same, and magnetic resonance imaging system - Google Patents
Local coil, method of manufacturing the same, and magnetic resonance imaging system Download PDFInfo
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- CN112394309B CN112394309B CN201910762319.0A CN201910762319A CN112394309B CN 112394309 B CN112394309 B CN 112394309B CN 201910762319 A CN201910762319 A CN 201910762319A CN 112394309 B CN112394309 B CN 112394309B
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- 238000002595 magnetic resonance imaging Methods 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims description 20
- 230000008878 coupling Effects 0.000 claims description 10
- 238000010168 coupling process Methods 0.000 claims description 10
- 238000005859 coupling reaction Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 8
- 230000001965 increasing effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000002059 diagnostic imaging Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 1
- 238000012631 diagnostic technique Methods 0.000 description 1
- 230000002500 effect on skin Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
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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
- G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
- G01R33/3628—Tuning/matching of the transmit/receive coil
-
- 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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- Health & Medical Sciences (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Engineering & Computer Science (AREA)
- Medical Informatics (AREA)
- Radiology & Medical Imaging (AREA)
- General Physics & Mathematics (AREA)
- Biophysics (AREA)
- Pathology (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
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- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
The invention relates to a local coil of a magnetic resonance imaging system, a magnetic resonance imaging system and a method of manufacturing a local coil of a magnetic resonance imaging system, the local coil comprising at least one coil unit, the coil unit comprising a plurality of antenna elements for receiving magnetic resonance signals, wherein a first antenna element and a second antenna element of the plurality of antenna elements are coupled in a concentric manner.
Description
Technical Field
The invention relates to a local coil of a magnetic resonance imaging system, a magnetic resonance imaging system and a method of manufacturing a local coil of a magnetic resonance imaging system.
Background
Medical imaging is a technique and process for obtaining internal tissue images of a human body or a part of a human body in a non-invasive manner for medical or medical research purposes, and has become an important medical diagnostic technique for all parts of a human body in widespread use. Magnetic resonance imaging systems employing medical imaging techniques apply a magnetic field within a cylindrical measurement volume in which a patient is located. Local coils are widely used in magnetic resonance imaging systems for receiving magnetic resonance signals to provide images with a good signal-to-noise ratio during a clinical scan phase.
During acquisition of the magnetic resonance signals, local coils for receiving the magnetic resonance signals are arranged directly next to the patient. Which has a better signal-to-noise ratio than other acquisition devices, such as body coils, spaced from the patient and used to receive the magnetic resonance signals. For example, a plurality of such local coils are arranged on the patient so as to cover a local or whole area of the patient's body. Since different substances have different relaxation properties, the condition inside the patient's body is deduced from the relaxation properties. The local coils are usually combined into components called local coil systems and each have a coil unit which receives magnetic resonance signals. The received magnetic resonance signals are processed in the local coils and derived from the magnetic resonance imaging system, transmitted to the magnetic resonance signal processing means for further data digitization and processing. In the prior art, in order to improve the signal-to-noise ratio of images, magnetic resonance imaging systems with high magnetic fields (e.g. 3T field strength) are used. However, this inevitably increases the use cost of the user. Such a way of improving the signal-to-noise ratio of the image is not desirable for users with limited costs.
Disclosure of Invention
The invention provides a local coil of a magnetic resonance imaging system and a manufacturing method thereof. The local coil may be applied in particular for low magnetic fields, for example 0.5T field strength, and for providing images with a good signal-to-noise ratio. The invention also provides a magnetic resonance imaging system comprising the local coil.
According to an aspect of the invention, the invention provides a local coil of a magnetic resonance imaging system, comprising at least one coil unit comprising: a plurality of antenna elements for receiving magnetic resonance signals, wherein a first antenna element of the plurality of antenna elements is coupled in a concentric manner with a second antenna element. Compared to conventional local coils, the local coil according to the invention has a lower equivalent resistance loss and a good quality factor without changing its dimensions as much as possible and without changing or reducing the distance of the coil from the examination object. The ratio of the no-load quality factor to the on-load quality factor of the local coil is increased, so that the local coil can provide good signal ratio in the application environment of low magnetic field.
According to an exemplary embodiment of the local coil of the magnetic resonance imaging system of the present invention, the first antenna element is radially spaced from the second antenna element by a predetermined distance. For example, the first antenna element circumferentially surrounds the second antenna element and is maintained at a predetermined distance from the second antenna element such that there is a gap between the first antenna element and the second antenna. Thus, in operation, the first antenna element is mutually inductive with the second antenna element and can be regarded as an integral loop, thereby providing a coil unit with a good quality factor without significantly changing the size of the local coil.
According to an exemplary embodiment of the local coil of the magnetic resonance imaging system of the present invention, each of the plurality of antenna elements comprises a plurality of signal receiving portions and a plurality of first capacitances, wherein the plurality of signal receiving portions are connected in series via the plurality of first capacitances. The plurality of signal receiving parts are connected in series through a plurality of first capacitors to form an integral loop for receiving magnetic resonance signals.
According to an exemplary embodiment of the local coil of the magnetic resonance imaging system of the present invention, each of the plurality of antenna elements further comprises a second capacitance, wherein the second capacitance is connected in parallel with one of the plurality of first capacitances. By connecting another capacitor in parallel, the resonance frequency of the coil unit can be changed, thereby tuning or detuning the coil.
According to an exemplary embodiment of the local coil of the magnetic resonance imaging system of the present invention, the plurality of first capacitances is a fixed capacitance and the second capacitance is a variable capacitance. Thereby, the possibility is provided to filter the noise of the coil and to dynamically adjust the tuning or detuning control of the coil.
According to an exemplary embodiment of the local coil of the magnetic resonance imaging system of the invention, the first antenna element comprises a plurality of first signal receiving portions, the second antenna element comprises a plurality of second signal receiving portions, and the coil unit further comprises a common capacitance, wherein the plurality of first signal receiving portions are connected in series via the common capacitance and the plurality of second signal receiving portions are connected in series via the same common capacitance. Thereby, the first antenna element and the second antenna element are coupled at the same capacitor, which enables saving of capacitive elements, and also enables easier tuning of the coil unit, and also enables creation of a relatively good detuned state.
According to an exemplary embodiment of the local coil of the magnetic resonance imaging system of the present invention, the first antenna element further comprises a second capacitance, wherein the second capacitance is connected in parallel with the common capacitance. By connecting another capacitor in parallel, the resonance frequency of one of the antenna elements of the coil unit can be changed, thereby tuning or detuning the coil.
According to an exemplary embodiment of the local coil of the magnetic resonance imaging system of the invention, the common capacitance is a fixed value capacitance and the second capacitance is a variable capacitance. Thereby, the possibility is provided to filter the noise of the coil and to dynamically adjust the tuning or detuning control of the coil.
According to an exemplary embodiment of the local coil of the magnetic resonance imaging system of the present invention, the local coil further comprises: and the tuning and detuning circuit is used for performing tuning and detuning control on the coil unit. For example, the tuning-off circuit forms a resonance circuit by using a capacitance or an inductance in a coil unit of a local coil, and when the resonance circuit is turned on, the resonance circuit forms an open circuit in an antenna element when the resonance circuit is not operated, and a tuning-off effect is generated, thereby performing switching control on the antenna element of the coil unit.
According to a further aspect of the invention there is also provided a magnetic resonance imaging system comprising a local coil of the magnetic resonance imaging system according to the description above. The magnetic resonance imaging system can be used in an application environment of a low magnetic field, reduces the use cost and can also provide images with good signal-to-noise ratio.
According to another aspect of the present invention there is also provided a method of manufacturing a local coil of a magnetic resonance imaging system, wherein the local coil comprises at least one coil unit, wherein the coil unit comprises a first antenna element and a second antenna element for receiving magnetic resonance signals, the method comprising: providing a first antenna element; providing a second antenna element; and coupling the first antenna element and the second antenna element in a concentric manner to form a coil unit. The method provides a coil unit having a good quality factor in a simple manufacturing process, and the local coil manufactured according to the method can be used in an application environment of a low magnetic field.
According to an exemplary embodiment of a method of manufacturing a local coil of a magnetic resonance imaging system according to the present invention, coupling the first antenna element and the second antenna element in a concentric manner comprises coupling the first antenna element and the second antenna element in a radially spaced apart predetermined distance. Thereby, a coil with a good quality factor is provided without increasing the size of the local coil as much as possible.
Drawings
The accompanying drawings constitute a part of this specification and are included to provide a further understanding of the invention. The drawings illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. Like parts are denoted by like reference numerals throughout the drawings. The figure shows:
fig. 1 shows a schematic configuration of a coil unit according to a first embodiment of the present invention.
Fig. 2 shows a schematic structural view of a coil unit according to a second embodiment of the present invention.
Fig. 3 shows a schematic structural view of a local coil according to an embodiment of the present invention.
Figure 4 shows a flow schematic of a method of manufacturing a local coil of a magnetic resonance imaging system according to an embodiment of the invention.
Reference numerals illustrate:
10: first antenna element
13: second antenna element
15: void space
20: a detuned circuit is tuned.
Detailed Description
In order that those skilled in the art will better understand the solution of the present invention, a technical solution of an embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention, and it is apparent that the described embodiment is only a part of the embodiment of the present invention, not all the embodiments. All other solutions, which a person skilled in the art would obtain without making any inventive effort, shall fall within the scope of protection of the present invention, based on the embodiments of the present invention.
It should be noted that the terms "comprising" and "having" and any variations thereof in the description and claims of the present invention and in the foregoing figures are intended to cover non-exclusive inclusion, for example, products or devices comprising a series of elements are not necessarily limited to those elements explicitly listed but may include other elements not listed or inherent to such products or devices.
Fig. 1 shows a schematic configuration of a coil unit according to a first embodiment of the present invention. In this embodiment the coil unit comprises a plurality of antenna elements for receiving magnetic resonance signals. For example, the antenna element is implemented as a radio frequency coil capable of conducting a current. The plurality of antenna elements comprises a first antenna element 10 and a second antenna element 13, wherein the first antenna element 10 is coupled in a concentric manner with the second antenna element 13. In operation, the first antenna element 10 is mutually inductive with the second antenna element 13, so that both antenna elements can be regarded as one loop resonating at the magnetic resonance frequency. Furthermore, it will be appreciated by those skilled in the art that although the present embodiment shows two antenna elements, embodiments comprising more than two antenna elements, e.g. three or four antenna elements, are also possible in order to obtain the same or similar technical effects as the present invention. In the embodiment of fig. 1, the first antenna element 10 and the second antenna element 13 have the same width in the radial direction and are coupled such that the first antenna element 10 is radially spaced a predetermined distance from the second antenna element 13, i.e. a gap 15 is present between the first antenna element 10 and the second antenna element 13. For example, the first antenna element 10 and the second antenna element 13 are designed to have a loop shape, whereby the first antenna element 10 has a larger diameter than the second antenna element 13. Furthermore, the antenna element may also be designed to have other shapes, such as square. As shown in fig. 1, the first antenna element 10 circumferentially surrounds the second antenna element 13, or the second antenna element 13 is arranged inside the first antenna element such that the geometric center of the first antenna element 10 is aligned with the geometric center of the second antenna element 13. For a coil unit formed by coupling two antenna elements as shown in the figures, the current distribution over the conductors of the coil will be more uniform than for a conventional coil, which will be concentrated at the inner edge due to the skin effect.
Further, the first antenna element 10 and the second antenna element 13 include a plurality of signal receiving portions and a plurality of capacitances C2, C3, C6, and C7, respectively. These capacitances C2, C3, C6 and C7 are implemented as fixed-value capacitances. In the embodiment shown in fig. 1, the upper and lower ends of the signal receiving portions on the left and right sides of the first antenna element 10 are connected in series via the capacitances C2 and C7, respectively, and the upper and lower ends of the signal receiving portions on the left and right sides of the second antenna element 13 are connected in series via the capacitances C3 and C6, respectively. The first antenna element 10 and the second antenna element 13 further comprise variable capacitances C1, C4, C5 and C8, respectively. In this embodiment, the variable capacitor C1 is connected in parallel with the fixed capacitor C2 in the first antenna element 10, the variable capacitor C4 is connected in parallel with the fixed capacitor C3 in the second antenna element 13, the variable capacitor C5 is connected in parallel with the fixed capacitor C6 in the second antenna element 13, and the variable capacitor C8 is connected in parallel with the fixed capacitor C7 in the first antenna element 10. For example, the fixed capacitance C7 and the variable capacitance C8 may be integrated in other components of the local coil (e.g., a tuning detune circuit).
Fig. 2 shows a schematic structural view of a coil unit according to a second embodiment of the present invention. In the embodiment shown in fig. 2, a variant is provided which differs from the embodiment shown in fig. 1. In contrast to fig. 1, the coil unit comprises a common capacitor C6. The signal receiving portions on the left and right sides of the first antenna element 10 are connected in series at the upper end via a fixed-value capacitor C2, and at the lower end via the common capacitor C6. The signal receiving portions on the left and right sides of the second antenna element 13 are connected in series at the upper end via a fixed value capacitor C3, and at the lower end via the same common capacitor C6. In other words, the first antenna element 10 and the second antenna element 13 are connected via a common capacitance C6, which enables a simpler tuning of the coil unit. Moreover, the variation of fig. 2 uses less capacitance than the embodiment of fig. 1.
Fig. 3 shows a schematic structural view of a local coil according to an embodiment of the present invention. The local coil further comprises a tuning detuning circuit 20 for tuning detuning control of the coil unit. For example, in the embodiment shown in fig. 3, the tune-away circuit 20 is connected to the first antenna element 10 of the coil unit. In this embodiment, the tuning-off circuit 20 forms a resonant circuit using a capacitance or inductance in the coil unit, forms a loop when turned on and resonates, and forms an open circuit in the antenna element when not in operation, thereby generating a tuning-off effect, and switching-controlling the antenna element of the coil unit. For the coil unit in the embodiment shown in fig. 1 or 2, only one tuning detuning circuit 20 is provided to control the plurality of antenna elements in the coil unit, once one of the plurality of antenna elements is detuned, the resonance frequency of the other antenna element may deviate from the magnetic resonance frequency, thereby providing a good detuning state of the coil without increasing costs.
Figure 4 shows a flow schematic of a method of manufacturing a local coil of a magnetic resonance imaging system according to an embodiment of the invention. In this embodiment, the local coil comprises at least one coil unit comprising a first antenna element and a second antenna element for receiving magnetic resonance signals. The manufacturing method according to the embodiment of the invention comprises the following steps: step S301, providing a first antenna element; step S303, providing a second antenna element; step S305, coupling the first antenna element and the second antenna element in a concentric manner to form a coil unit. Further, in step S305, the step of coupling the first antenna element and the second antenna element in a concentric manner includes coupling the first antenna element and the second antenna element in a manner spaced apart by a predetermined distance in a radial direction. Thus, a coil with a good quality factor is provided without increasing the size of the local coil as much as possible.
In the embodiments provided in the present invention, it should be understood that the disclosed technology may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units or modules is merely a logical function division, and there may be other manners of dividing actually implementing, for example, multiple units or modules or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling shown or discussed as being coupled directly or indirectly to one another through some interface, module, or unit may be in electrical or other form.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A local coil of a magnetic resonance imaging system comprising at least one coil unit, characterized in that the coil unit comprises:
a plurality of antenna elements for receiving magnetic resonance signals, wherein a first antenna element of the plurality of antenna elements is coupled in a concentric manner with a second antenna element, the first antenna element comprising a plurality of first signal receiving portions, the second antenna element comprising a plurality of second signal receiving portions, and the coil unit further comprising a common capacitance, wherein the plurality of first signal receiving portions are connected in series via the common capacitance and the plurality of second signal receiving portions are connected in series via the same common capacitance.
2. The local coil of claim 1, wherein the first antenna element is radially spaced a predetermined distance from the second antenna element.
3. The local coil of claim 1, wherein each of the plurality of antenna elements comprises a plurality of signal receiving portions and a plurality of first capacitances, wherein the plurality of signal receiving portions are connected in series via the plurality of first capacitances.
4. The local coil of claim 3, wherein each of said plurality of antenna elements further comprises a second capacitance, wherein said second capacitance is in parallel with one of said plurality of first capacitances.
5. The local coil of claim 4, wherein the first plurality of capacitances are fixed capacitance and the second capacitance is a variable capacitance.
6. The local coil of claim 1, wherein the first antenna element further comprises a second capacitor, wherein the second capacitor is connected in parallel with the common capacitor.
7. The local coil of claim 6, wherein the common capacitance is a fixed capacitance and the second capacitance is a variable capacitance.
8. The local coil according to any one of claims 1 to 7, further comprising:
and the tuning and detuning circuit is used for performing tuning and detuning control on the coil unit.
9. Magnetic resonance imaging system, characterized by comprising a local coil according to any of claims 1 to 8.
10. A method of manufacturing a local coil of a magnetic resonance imaging system, wherein the local coil comprises at least one coil unit, wherein the coil unit comprises a first antenna element and a second antenna element for receiving magnetic resonance signals, characterized in that the method comprises:
providing the first antenna element;
providing the second antenna element; and
coupling the first antenna element and the second antenna element in a concentric manner to form the coil unit,
the first antenna element includes a plurality of first signal receiving portions, the second antenna element includes a plurality of second signal receiving portions, and the coil unit further includes a common capacitance, wherein the plurality of first signal receiving portions are connected in series via the common capacitance, and the plurality of second signal receiving portions are connected in series via the same common capacitance.
11. The method of claim 10, wherein coupling the first antenna element and the second antenna element in a concentric manner comprises:
the first antenna element is coupled with the second antenna element in a radially spaced apart predetermined distance.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910762319.0A CN112394309B (en) | 2019-08-19 | 2019-08-19 | Local coil, method of manufacturing the same, and magnetic resonance imaging system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910762319.0A CN112394309B (en) | 2019-08-19 | 2019-08-19 | Local coil, method of manufacturing the same, and magnetic resonance imaging system |
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| CN112394309A CN112394309A (en) | 2021-02-23 |
| CN112394309B true CN112394309B (en) | 2024-02-20 |
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|---|---|---|---|---|
| US8952858B2 (en) * | 2009-06-17 | 2015-02-10 | L. Pierre de Rochemont | Frequency-selective dipole antennas |
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2019
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| CN1175802A (en) * | 1996-07-23 | 1998-03-11 | 摩托罗拉公司 | Loop antenna |
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