CN113253173B - Radio frequency coil device for magnetic resonance neck imaging - Google Patents
Radio frequency coil device for magnetic resonance neck imaging Download PDFInfo
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- CN113253173B CN113253173B CN202110499578.6A CN202110499578A CN113253173B CN 113253173 B CN113253173 B CN 113253173B CN 202110499578 A CN202110499578 A CN 202110499578A CN 113253173 B CN113253173 B CN 113253173B
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- 238000003384 imaging method Methods 0.000 title claims abstract description 20
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 210000001165 lymph node Anatomy 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 210000001519 tissue Anatomy 0.000 description 3
- 238000003491 array Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 210000000629 knee joint Anatomy 0.000 description 2
- 238000002595 magnetic resonance imaging Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000007787 solid 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
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
- G01R33/34084—Constructional details, e.g. resonators, specially adapted to MR implantable coils or coils being geometrically adaptable to the sample, e.g. flexible coils or coils comprising mutually movable parts
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- General Physics & Mathematics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
The application relates to a radio frequency coil device for magnetic resonance neck imaging, which comprises a coil shell and a plurality of coil units arranged in the coil shell, wherein a laryngeal aperture is arranged on the coil shell in a penetrating way, and the plurality of coil units comprise a first coil unit which is arranged around the periphery of the laryngeal aperture. The application improves the imaging quality and the use experience of the checked person.
Description
Technical Field
The application relates to the field of magnetic resonance imaging, in particular to a radio frequency coil device for magnetic resonance neck imaging.
Background
Magnetic resonance imaging systems refer to a class of imaging devices for medical examinations made using magnetic resonance phenomena, wherein a radio frequency (RF, radioFrequency) receiving coil is one of the important components. The effect of the rf receiver coil therein may be likened to an adult's eye, with the final sharpness of the image being directly proportional to the coil signal-to-noise ratio (sensitivity). In order to improve the sharpness (or signal-to-noise ratio, or sensitivity) of the image, the primary starting point for a typical coil design is to determine the shape and size of the coil, which cannot be too small nor too small. If the coil size is too large, the sharpness of the magnetic resonance image is reduced; too small, there may be a significant proportion of patient-specific sites that cannot be placed inside the coil. The primary principle of coil design is to make the coil size as small as possible and as close to the scan site or object as possible while meeting the size of the scan site or object.
Therefore, when scanning different parts of the human body, special coils are generally required to obtain the best image effect, for example, a coil for scanning the head is called a head coil, a coil for scanning the knee joint is called a knee joint coil, and a coil for scanning the neck is called a neck coil or a neck coil. The magnetic resonance scanning adopts the special coil to help greatly improve the performance of clinical images.
In order to optimize the quality of the magnetic resonance scan image, the idea is always to try to bring the coil as close as possible to the body of the subject, and there is no exception to the neck coil which is used to scan the neck to acquire the neck magnetic resonance examination image.
The present application is derived therefrom.
Disclosure of Invention
The application aims to solve the technical problems that: a radio frequency coil device for magnetic resonance neck imaging is proposed which has improved the use experience of the subject while optimizing the imaging quality.
In order to solve the technical problems, a first technical scheme provided by the application is as follows:
a radio frequency coil device for magnetic resonance neck imaging comprises a coil shell and a plurality of coil units arranged in the coil shell, wherein a laryngeal aperture is arranged on the coil shell in a penetrating manner.
The first technical scheme is based on the above, and further comprises one or more of the following preferable schemes:
the plurality of coil units includes a first coil unit disposed around the periphery of the laryngeal aperture.
The plurality of coil units includes at least three second coil units partially overlapping the first coil units.
Each of the at least three second coil units is disposed against an outside of a bore wall of the laryngeal aperture.
The at least three second coil units are sequentially and partially overlapped along the circumferential direction of the laryngeal aperture.
The coil units are eight in total, the second coil units are five in total, the plurality of coil units further comprise two third coil units which are arranged on the radial outer sides of the peripheral structures where the five second coil units are located, one third coil unit is partially overlapped with the two second coil units on the left end side, and the other third coil unit is partially overlapped with the two second coil units on the right end side.
Sixteen coil units are arranged in total, six second coil units are arranged in total, the plurality of coil units further comprise nine third coil units which are sequentially overlapped along the circumferential direction of the throat knot hole and are positioned on the radial outer side of the circumferential structure where the six second coil units are positioned, and each of the nine third coil units is respectively overlapped with at least one second coil unit partially.
The three third coil units in the middle are sequentially and linearly arranged from left to right;
the other two third coil units respectively adjacent to two sides of the three linearly arranged third coil units and the two second coil units in the middle are sequentially linearly arranged from left to right;
the first coil units are respectively adjacent to the other two third coil units on two sides of the middle five third coil units, and are respectively adjacent to the other two second coil units on two sides of the middle two second coil units, and the bottoms of the first coil units and the bottoms of the second coil units are arranged in a height parallel.
In order to solve the technical problems, a second technical scheme provided by the application is as follows:
a radio frequency coil device for magnetic resonance neck imaging comprises a coil shell and a plurality of coil units arranged in the coil shell, wherein a laryngeal opening is formed in the outer edge of the coil shell.
In order to solve the above technical problems, a third technical solution provided by the present application is:
a radio frequency coil device for magnetic resonance neck imaging comprises a coil shell and a plurality of coil units arranged in the coil shell, wherein the coil shell is provided with an inner side surface which is abutted against the neck of a person to be examined, a laryngeal recess which is arranged on the inner side surface and is outwards concave is formed in the coil shell, and one of the plurality of coil units is circumferentially arranged on the periphery of the laryngeal recess.
The application has the beneficial effects that:
1. the coil shell of the neck coil device is provided with the throat knot hole in a penetrating mode, so that the coil device can be better attached to the skin of a person to be inspected, and the comfort level of the person to be inspected is reduced.
2. One coil unit is arranged around the periphery of the laryngeal aperture, and can acquire signals at the laryngeal aperture during examination, so that corresponding images are obtained. And a part of coil units are sequentially and partially overlapped (overlapped) along the circumferential direction of the laryngeal aperture, are partially overlapped at the periphery of the laryngeal aperture, and simultaneously are abutted against the outer side of the wall of the laryngeal aperture, so that the coil units are distributed by fully utilizing the structural characteristics of the laryngeal aperture, the structure is compact, and clear magnetic resonance images of the laryngeal aperture and tissues around the laryngeal aperture can be obtained.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following brief description of the drawings of the embodiments will make it apparent that the drawings in the following description relate only to some embodiments of the present application and are not limiting of the present application.
Fig. 1 is an exploded view of a first view of a radio frequency coil device in accordance with embodiment 1 of the present application.
Fig. 2 is an exploded view of a second view of the radio frequency coil device in embodiment 1 of the present application.
Fig. 3 is an exploded view of a third view angle of the radio frequency coil device in embodiment 1 of the present application.
FIG. 4 is a graph showing the calculated image according to the obtained raw data after the RF coil apparatus of example 1 scans the phantom; the characteristic signal to noise ratios are 5069, 5817, 7268, 6245 and 5533 in sequence from top to bottom.
Fig. 5 is an exploded view of a first view of a radio frequency coil device according to a second embodiment of the present application.
Fig. 6 is an exploded view of a second view of a radio frequency coil device according to a second embodiment of the present application.
Fig. 7 is an exploded view of a third view of a radio frequency coil device according to a second embodiment of the present application.
Fig. 8 is a front view of a radio frequency coil device in accordance with a third embodiment of the present application.
FIG. 9 is a graph showing the calculated image according to the obtained raw data after the RF coil apparatus of embodiment 1 of the present application scans the same water pattern as that of FIG. 4; the characteristic signal-to-noise ratios are 6964, 7960, 9385, 8323, 7330 in sequence from top to bottom.
Fig. 10 is a graph comparing the signal to noise ratio curves at the central axis of the water mode in fig. 4 and 9, wherein the solid line represents example 2 and the dotted line represents example 1.
Reference numerals illustrate:
1-first coil unit, 2-second coil unit, 3-third coil unit, 4-coil shell, 4 a-laryngeal aperture, 4 b-laryngeal opening, 4 c-outer rim, 401-inner half shell, 402-outer half shell, 401 a-inner curved surface, 402 a-outer curved surface, 401 b-outer side of inner half shell, 402 b-inner side of outer half shell.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present application. It will be apparent that the described embodiments are some, but not all, embodiments of the application. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present application fall within the protection scope of the present application.
In the description of the present specification and claims, the terms "first," "second," and the like, if any, are used merely to distinguish between the described objects and do not have any sequential or technical meaning. Thus, an object defining "first," "second," etc. may explicitly or implicitly include one or more such objects. Also, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one, and "a plurality" of "are used to indicate no less than two. The term "plurality" as used herein means not less than two.
In the description of the present application and in the claims, the terms "connected," "mounted," "secured," and the like are to be construed broadly unless otherwise indicated. For example, "connected" may be connected in a split manner, or may be integrally connected; can be directly connected or indirectly connected through an intermediate medium; either non-detachably or detachably. The specific meaning of the aforementioned terms in the present application can be understood by those skilled in the art according to the specific circumstances.
In the description of the present specification and claims, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "horizontal", etc., based on the azimuth or positional relationship shown in the drawings, it is only for convenience of clarity and simplicity to describe the present application, rather than to indicate or imply that the elements referred to must have a specific direction, be constructed and operated in a specific azimuth, these directional terms are relative concepts for relative description and clarity, and may be changed accordingly in accordance with the change in azimuth in which the components are placed in the drawings. For example, if the device is turned over in the figures, elements described as "below" other elements would then be oriented "above" the other elements.
Embodiments of the present application will now be described with reference to the accompanying drawings.
Example 1:
fig. 1 to 3 show a specific embodiment of a radio frequency coil arrangement for magnetic resonance neck imaging according to the application, comprising a coil housing 4 and 8 coil units arranged therein, which 8 coil units together form an 8-channel coil array. The coil housing 4 serves both as a carrier for the individual coil units, carrying the coil units, and also as a protective body for the individual coil units, protecting the coil units from external damage.
In order to allow the above-described respective coil units to be brought as close to the body of the subject as possible at the time of magnetic resonance examination, the present embodiment is configured such that the coil housing 4 and the coil units, specifically, the coil housing 4 has: an inner curved surface 401a which is adapted to the neck of the human face, an outer curved surface 402a which is away from the inner surface, and an outer edge 4c which is connected to the outer periphery of the inner curved surface and the outer curved surface. The surface on which the 8 coil units are located (i.e., the surface on which the 8 coil unit arrays are located) is a curved surface parallel to the inner curved surface 401a (including the area of the throat hole described below).
Further, the coil housing 4 is constituted by an inner half-shell 401 and an outer half-shell 402 which are detachably connected, and the above-mentioned 8 coil units are all hidden between the inner half-shell and the outer half-shell. An inner curved surface 401a is formed on the inner half shell 401 and an outer curved surface 402a is formed on the outer half shell 402. Each coil unit is fixed against an outer side 401b of the inner half-shell 401, i.e. the side of the inner half-shell 401 facing away from the subject.
In order to acquire the neck image as widely as possible, the 8 coil units in the present embodiment are substantially full of the coil housing 4. The area of the face where the 8 coil units are located is preferably not less than 95% of the area of the inner curved surface. Furthermore, each coil unit is less than 1cm from the outer rim 4c of the coil housing, and can be even directly abutted against the inner side of the outer rim 4c (the inner cavity surface of the coil housing at the outer rim), thus making the structure of the coil apparatus more compact.
Due to the design, when the coil device is used for magnetic resonance examination, the 8 coil units (the coil array formed by the coil units) can cover the side parts of the I area, the II area, the III area, the IV area, the V area, the VI area and the VII area of the cervical lymph node of a person to be examined at the same time, so that images of the I area, the II area, the III area, the IV area, the V area, the VI area and the VII area of the cervical lymph node of the person to be examined can be acquired at the same time, and the full examination of the illness state of the patient is facilitated. The cervical lymph nodes I, II, III, IV, V, VI and VII are medical special words and have clear meanings and will not be described here.
A key improvement of this embodiment is that, in order to make the coil housing 4 better fit the skin of the examined person and improve the comfort of the examined person, a laryngeal opening 4a is provided through the coil housing 4 in this embodiment, so that the protruding laryngeal structure of the examined person can freely move during the magnetic resonance examination.
Also, in order to acquire a signal at the laryngeal node, one of the above 8 coil units, the first coil unit 1, is disposed around the outer peripheral first coil unit of the laryngeal aperture 4 a.
The other 5 of the 8 coil units, 5 second coil units 2, are arranged to partially overlap the first coil unit 1.
In order to fully utilize the supporting area of the solid portion of the coil housing 4, each of the above 5 second coil units 2 is disposed against the outer side of the wall of the laryngeal aperture 4 a. Further, the 5 second coil units 2 are arranged to be partially overlapped (overlap) in order along the circumferential direction of the laryngeal aperture 4 a.
The above-described "overlap" design is intended to reduce the coupling between coils. To make the arrangement of the coils more compact, any two adjacent second coil units 2 and the first coil units 1 can have a common overlap area.
The other 2-2 third coil units 3 of the 8 coil units are arranged radially outside the circumferential structure in which the 5 second coil units 2 are located (the circumferential structure whose upper side is open), one of the third coil units 3 is arranged to partially overlap with the two second coil units 2 on the left end side, and the other third coil unit 3 is arranged to partially overlap with the two second coil units 2 on the right end side.
The arrangement mode of the fold 8-channel coil array is compact in structure, small in signal coupling and high in imaging definition, and is matched with the shape of the neck of a human body and the positions of key tissues.
In order to improve the inspection comfort of the inspected person, the present embodiment sets the outer edge 4c of the coil housing 4 to be an arc-shaped burring which is slightly turned outward.
Example 2:
fig. 5 to 8 show a second embodiment of a radio frequency coil device for magnetic resonance neck imaging according to the present application, which is similar in construction to embodiment 1, with the main differences:
in this embodiment, a total of 16 coil units are provided, and these 16 coil units together form a 16-channel coil array. The aforementioned 16 coil units are 1 first coil unit 1,6 second coil units 2,9 third coil units 3, respectively. Wherein the first coil unit 1 is circumferentially arranged at the periphery of the laryngeal aperture 4 a. The 6 second coil units 2 are arranged to be partially overlapped (overlapped) in turn along the circumferential direction of the laryngeal aperture 4a, and each of the second coil units 2 is not only partially overlapped (overlapped) with the first coil unit 1 but also abuts against the outer side of the aperture wall of the laryngeal aperture 4 a. The 9 third coil units 3 are arranged to overlap each other in the circumferential direction of the throat hole 4a, and are located radially outside the circumferential structure (upper-side opening circumferential structure) in which the 6 second coil units 2 are located. Each third coil unit 3 is arranged partially overlapping (overlap) with the corresponding at least one second coil unit 2.
As shown in fig. 5, any two adjacent second coil units 2 and the first coil units 1 have a common overlap region, and any two adjacent third coil units 3 and the corresponding second coil units 2 also have a common overlap region.
And, 11 coil units (the first coil unit 1, the two second coil units 2 on the end side, and all 9 third coil units 3) on the outermost periphery in the 16-channel coil array constitute a closed loop, and each of the coil units in this closed loop is arranged close to the outer edge 4a of the coil housing 4-at a distance of less than 1cm from the outer edge.
We have found that further such an arrangement of the 16-channel coil array results in better imaging quality: referring to fig. 5, the middle three third coil units 3 are sequentially and linearly arranged from left to right, and the other two third coil units 3 respectively abutting against both sides of the linearly arranged three third coil units 3 are sequentially and linearly arranged from left to right with the middle two second coil units 2. The first coil unit 1 is respectively abutted against the other two third coil units 3 on both sides of the middle five third coil units 3, is respectively abutted against the other two second coil units 2 on both sides of the middle two second coil units 2, the bottoms of the five coil units are arranged in a flush manner, and the five coil units are sequentially arranged from left to right.
Compared with the 8-channel coil array in embodiment 1, the number of coils in the 16-channel coil array in this embodiment is increased, the structure is more compact, the imaging quality is slightly improved, but the cost is increased, and the coil arrangement is too complex. The signal coupling is small in the coil arrangement mode, and the shape of the neck of the human body and the position of key tissues are matched with each other very well.
Fig. 4 and 9 are images calculated from the obtained raw data after the rf coil apparatus of example 1 and the rf coil apparatus of example 2 scan the same water model, respectively, the images are 256×256 pixels. And the mechanical dimensions of the coil housings in example 1 and example 2 are comparable.
In the image shown in fig. 10, the ordinate SNR is a ratio, dimensionless. The abscissa is the distribution of pixel points. Only the signal-to-noise ratio curve at the central axis of the most representative water mode is taken in fig. 10.
As can be seen from fig. 4, 9 and 10, the 16-channel scheme in example 2 has a better signal-to-noise ratio than the 8-channel scheme in example 1, and the 8-channel scheme in example 1 already has a good signal-to-noise ratio.
Example 3:
fig. 7 shows a third embodiment of a radio frequency coil device for magnetic resonance neck imaging according to the present application, which differs from the above-described embodiments 1 and 2 in that the present embodiment does not provide a laryngeal aperture in the coil housing, but provides a laryngeal opening 4b for the outer rim 4c of the coil housing 4. The function of the laryngeal opening 4b is the same as that of the laryngeal aperture in embodiments 1 and 2, and is to provide a free movement space for the laryngeal mask of the person to be inspected, so that the coil housing 4 can better fit the skin of the person to be inspected, and the feeling of the person to be inspected is not affected too much.
After the laryngeal aperture is replaced with the laryngeal opening 4b, the above-described 8-channel and 16-channel coil array structures are used as they are, with the disadvantage that a portion of the first coil unit may be exposed at the laryngeal opening 4b. To eliminate the aforementioned drawbacks, in other embodiments in which the laryngeal aperture is replaced with a laryngeal opening 4b, the first coil unit in the 8-channel and 16-channel coil arrays described above may be removed, leaving only the other 7 or 15 coil units. Obviously, the laryngeal aperture in embodiments 1 and 2 may be replaced with a recess that is recessed outward from the inner curved surface 401a of the coil housing 4, so that the laryngeal-of the inspected person provides a movable space-the laryngeal-recess. In this case, the above-described coil array structures of 8-channel and 16-channel are also applicable, with the first coil unit being circumferentially arranged at the periphery of the laryngeal recess.
The above is only an exemplary embodiment of the present application and is not intended to limit the scope of the present application, which is defined by the appended claims.
Claims (3)
1. A radio frequency coil device for magnetic resonance neck imaging, comprising a coil shell (4) and a plurality of coil units arranged in the coil shell, wherein a laryngeal aperture (4 a) is arranged on the coil shell (4) in a penetrating way, the plurality of coil units are suitable for covering the side parts of an I area, an II area, an III area, an IV area, a V area, a VI area and a VII area of a cervical lymph node of a person to be examined at the same time, and the plurality of coil units comprise a first coil unit (1) which is arranged around the periphery of the laryngeal aperture (4 a), five or six second coil units (2) which are partially overlapped with the first coil unit (1), and the five or six second coil units (2) are sequentially and partially overlapped along the circumferential direction of the laryngeal aperture;
the coil units are eight in number, the second coil units (2) are five in number, the plurality of coil units further comprise two third coil units (3) arranged on the radial outer sides of the circumferential structures where the five second coil units (2) are located, one third coil unit (3) is partially overlapped with the two second coil units (2) on the left end side, and the other third coil unit (3) is partially overlapped with the two second coil units (2) on the right end side; or sixteen coil units are arranged in total, six second coil units (2) are arranged in total, the plurality of coil units further comprise nine third coil units (3) which are sequentially overlapped along the circumferential direction of the laryngeal aperture and are positioned on the radial outer side of the circumferential structure where the six second coil units (2) are positioned, and each of the nine third coil units (3) is respectively overlapped with at least one second coil unit (2) partially.
2. The radio frequency coil device for magnetic resonance neck imaging according to claim 1, characterized in that each of the second coil units (2) is arranged against the outside of the bore wall of the laryngeal aperture.
3. The radio frequency coil device for magnetic resonance neck imaging according to claim 1, wherein sixteen cases are provided for the coil units:
the three middle third coil units (3) are sequentially and linearly arranged from left to right;
the other two third coil units (3) adjacent to two sides of the three linearly arranged third coil units (3) and the middle two second coil units (2) are sequentially and linearly arranged from left to right;
the first coil units (1) are respectively abutted against the other two third coil units (3) on two sides of the middle five third coil units (3), and are respectively abutted against the other two second coil units (2) on two sides of the middle two second coil units (2), and the bottoms of the two second coil units are arranged in a height flush mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110499578.6A CN113253173B (en) | 2021-05-08 | 2021-05-08 | Radio frequency coil device for magnetic resonance neck imaging |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110499578.6A CN113253173B (en) | 2021-05-08 | 2021-05-08 | Radio frequency coil device for magnetic resonance neck imaging |
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| CN113253173A CN113253173A (en) | 2021-08-13 |
| CN113253173B true CN113253173B (en) | 2023-12-08 |
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