JP2013022065A - Coil pad and planar coil device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil pad and a planar coil device which are capable of stable fixation to a subject.SOLUTION: The coil pad includes an adhesion part and an elastic member. The adhesion part is adhered to the surface of the planar coil device having flexibility and detecting the generation of a high frequency magnetic field and/or a magnetic resonance signal generated from the subject. The elastic member has an adhesion surface where the adhesion part is formed and is protruded to a direction apart from the adhesion surface.

Description

  Embodiments described herein relate generally to a coil pad and a planar coil device.

  A magnetic resonance imaging apparatus (hereinafter referred to as MRI (Magnetic Resonance Imaging) apparatus) images the inside of a subject using a magnetic resonance phenomenon. Specifically, the MRI apparatus sends a high-frequency pulse to the transmission coil, thereby causing a current to flow through the transmission coil and generating a high-frequency magnetic field in the transmission coil. Then, the magnetic resonance imaging apparatus detects a magnetic resonance (MR) signal emitted from a subject located in a high-frequency magnetic field generated by a transmission coil, and detects the magnetic resonance based on the detected MR signal. Reconstruct an image (MR image).

  In recent MRI apparatuses, as a receiving coil for receiving MR signals emitted from a subject, a flexible bendable receiving coil (“plane”) can be attached so as to be in close contact with the subject and cover a predetermined part. Also referred to as “coil”, “surface coil”, etc.). When such a flexible receiving coil is used, the receiving coil can be arranged at a desired part of the subject. Therefore, the MRI apparatus reconstructs a high-quality MR image for the desired part. It becomes possible to do.

Special table 2004-516092 gazette

  The problem to be solved by the present invention is to provide a coil pad and a planar coil device that can be stably fixed to a subject.

  The coil pad according to the embodiment includes an adhesive portion and an elastic member. The adhesion part adheres to the surface of a flexible planar coil that generates a high-frequency magnetic field and detects a magnetic resonance signal emitted from the subject, or detects a magnetic resonance signal emitted from the subject. The elastic member has an adhesive surface on which the adhesive portion is formed, and rises in a direction away from the adhesive surface.

FIG. 1 is a diagram illustrating a configuration of the MRI apparatus according to the first embodiment. FIG. 2 is a diagram illustrating an example to which the receiving coil according to the first embodiment is applied. FIG. 3 is a diagram illustrating an example of a flexible receiving coil. FIG. 4 is an external view showing the receiving coil according to the first embodiment. FIG. 5 is a top view and a cross-sectional view showing the coil pad of FIG. FIG. 6 is a side view showing the receiving coil of FIG. 4 in a curved state. FIG. 7 is a diagram illustrating an example of the receiving coil of FIG. 4 attached to the subject. FIG. 8 is a diagram illustrating a modification of the first embodiment. FIG. 9 is a top view and a cross-sectional view showing the coil pad of FIG. FIG. 10 is a side view showing the receiving coil of FIG. 8 in a curved state. FIG. 11 is a diagram illustrating a modification of the first embodiment. FIG. 12 is a diagram illustrating a modification of the first embodiment.

(First embodiment)
FIG. 1 is a diagram illustrating a configuration of the MRI apparatus according to the first embodiment. As shown in the figure, the MRI apparatus 1 according to the first embodiment includes a static magnetic field magnet 11, a gradient magnetic field coil 12, a gradient magnetic field power source 13, a bed 14, a bed control unit 15, a transmission coil 16, a transmission unit 17, A reception coil 100, a reception unit 19, and a computer system 20 are included.

  The static magnetic field magnet 11 is formed in a hollow cylindrical shape, and generates a uniform static magnetic field in the internal space. For example, the static magnetic field magnet 11 is a permanent magnet or a superconducting magnet. The gradient magnetic field coil 12 is formed in a hollow cylindrical shape and generates a gradient magnetic field in an internal space. Specifically, the gradient magnetic field coil 12 is disposed inside the static magnetic field magnet 11 and generates a gradient magnetic field upon receiving a current from a gradient magnetic field power supply 13 described later. The gradient magnetic field power supply 13 supplies a current to the gradient coil 12 based on the pulse sequence execution data sent from the computer system 20.

  The couch 14 includes a couch top 14a on which the subject P is placed, and the couch top 14a is tilted in a state where the subject P is placed under the control of the couch controller 15 described later. It is inserted into the cavity (imaging port) of the magnetic field coil 12. Normally, the bed 14 is installed such that the longitudinal direction is parallel to the central axis of the static magnetic field magnet 11. The couch controller 15 is a device that controls the couch 14 under the control of the controller 27 described later, and drives the couch 14 to move the couch top 14a in the longitudinal direction and the vertical direction.

  The transmission coil 16 is disposed inside the gradient magnetic field coil 12 and receives a high frequency pulse from the transmission unit 17 to generate a high frequency magnetic field. The transmission unit 17 transmits a high frequency pulse corresponding to the Larmor frequency to the transmission coil 16 based on the pulse sequence execution data sent from the computer system 20. The transmission unit 17 includes an oscillation unit, a phase selection unit, a frequency conversion unit, an amplitude modulation unit, a high frequency power amplification unit, and the like.

  Such an oscillating unit generates a high-frequency signal having a resonance frequency unique to the target nucleus in a static magnetic field. The phase selection unit selects the phase of the high-frequency signal. The frequency conversion unit converts the frequency of the high-frequency signal output from the phase selection unit. The amplitude modulation unit modulates the amplitude of the high-frequency signal output from the frequency modulation unit according to, for example, a sinc function. The high frequency power amplification unit amplifies the high frequency signal output from the amplitude modulation unit. As a result of the operation of each of these units, the transmission unit 17 transmits a high-frequency pulse corresponding to the Larmor frequency to the transmission coil 16.

  The receiving coil 100 is disposed inside the gradient magnetic field coil 12 and receives an MR signal radiated from the subject P due to the influence of the high-frequency magnetic field. Specifically, the receiving coil 100 has a plurality of coils for receiving MR signals. When the MR signals are received by the coils, the receiving coils 100 output the received MR signals to the receiving unit 19.

  The receiving unit 19 generates MR signal data based on the MR signal output from the receiving coil 100 based on the pulse sequence execution data sent from the computer system 20. When the receiving unit 19 generates MR signal data, the receiving unit 19 transmits the MR signal data to the computer system 20. The receiving unit 19 may be provided on the gantry device side including the static magnetic field magnet 11 and the gradient magnetic field coil 12.

  The computer system 20 performs overall control of the MRI apparatus 1, data collection, image reconstruction, and the like. The computer system 20 includes an interface unit 21, a data collection unit 22, a data processing unit 23, a storage unit 24, a display unit 25, an input unit 26, and a control unit 27.

  The interface unit 21 is connected to the gradient magnetic field power source 13, the bed control unit 15, the transmission unit 17, and the reception unit 19, and inputs / outputs signals exchanged between the connected units and the computer system 20. Control.

  The data collection unit 22 collects MR signal data transmitted from the reception unit 19 via the interface unit 21.

  When collecting the MR signal data, the data collecting unit 22 causes the storage unit 24 to store the collected MR signal data.

  The data processing unit 23 performs post-processing, that is, reconstruction processing such as Fourier transform, on the MR signal data stored in the storage unit 24, so that spectrum data or MR data of the desired nuclear spin in the subject P is obtained. Generate an image.

  The storage unit 24 stores the MR signal data collected by the data collection unit 22 and the MR image generated by the data processing unit 23 for each subject P.

  The display unit 25 displays various information such as spectrum data or MR images generated by the data processing unit 23. As the display unit 25, a display device such as a liquid crystal display can be used.

  The input unit 26 receives various operations and information inputs from the operator. As the input unit 26, a pointing device such as a mouse or a trackball, a selection device such as a mode change switch, or an input device such as a keyboard can be used as appropriate.

  The control unit 27 includes a CPU, a memory, and the like (not shown), and controls the MRI apparatus 1 overall by controlling the above-described functional units.

  The overall configuration of the MRI apparatus 1 according to the first embodiment has been described above. However, the receiving coil 100 according to the first embodiment is assumed to be a flexible and bendable planar coil. FIG. 2 shows an example in which the receiving coil 100 according to the first embodiment is applied. In the example shown in FIG. 2, the receiving coil 100 includes a later-described substrate unit 111 in the planar coil unit 110, and the planar coil unit 110 is curved so that the subject P covers the right shoulder of the subject P. Installed. The receiving coil 100 is fixed to the subject P by a holding member 112 having elasticity. Specifically, both ends of the holding member 112 are bonded to both ends of the receiving coil 100 by an adhesive portion such as a hook-and-loop fastener (for example, Velcro (registered trademark) or the like). The holding member 112 is wound around the subject P in a state where the holding member 112 is adhered to the reception coil 100, thereby fixing the reception coil 100 to the subject P so as to wrap and cover the right shoulder of the subject P.

  Here, it is considered that the flexible receiving coil as in the above example is not stably fixed to the subject P. This point will be described with reference to FIG. FIG. 3 is a diagram illustrating an example of the receiving coil 900 having flexibility. In the example illustrated in FIG. 3, the flexible receiving coil 900 is attached to the right shoulder of the subject P, similarly to the receiving coil 100 illustrated in FIG. 2. At this time, the receiving coil 900 may move in the direction B1 shown in FIG. 3 even when the receiving coil 900 is fixed to the subject P by the holding member 912. Specifically, both ends of the substrate unit 911 may easily move in the direction B1 like a balance having a contact area A1 between the substrate unit 911 and the shoulder of the subject P as a fulcrum. As a result, the receiving coil 900 illustrated in FIG. 3 is not stably fixed to the subject P.

  As described above, when the receiving coil 900 is not stably fixed to the subject P, the position of the receiving coil 900 with respect to the subject P varies, and therefore, factors such as image quality degradation of the MR image generated by the MRI apparatus can be considered. There is a possibility. Although it is conceivable to insert a pad into a gap formed between the receiving coil 900 and the subject P after the receiving coil 900 is mounted on the subject P, reception of the subject P in the process of inserting the pad is also conceivable. The problem that the position of the coil 900 shifts and the problem that the pad itself falls from the gap remain.

  Therefore, the receiving coil 100 according to the first embodiment has the convex portion of the elastic body at a position where the receiving coil 100 is mounted on the protruding portion of the subject P, so that the receiving coil 100 is stably fixed to the subject P. to enable. Hereinafter, the receiving coil 100 according to the first embodiment will be described in detail.

  FIG. 4 is an external view showing the receiving coil 100 according to the first embodiment. As in the example illustrated in FIG. 4, the receiving coil 100 according to the first embodiment includes a planar coil unit 110 and a coil pad 120. The planar coil unit 110 and the coil pad 120 have adhesive portions such as surface fasteners on the surfaces facing each other, and are detachably bonded by the adhesive portions.

  The planar coil unit 110 includes a coil for receiving MR signals therein, and includes a substrate unit 111 on the surface 110a. In the example illustrated in FIG. 4, the planar coil unit 110 includes a substrate unit 111 at the center in the longitudinal direction of the surface 110 a. The substrate unit 111 is provided with a preamplifier or a circuit for decoupling, and is a portion that cannot be bent in the example shown in FIG. That is, the planar coil unit 110 can be bent in a region other than the region where the substrate unit 111 is provided, but cannot be bent in the region where the substrate unit 111 is provided. The board unit 111 also includes a cable 113 that electrically connects the board unit 111 and the receiving unit 19.

  Moreover, the planar coil part 110 has the adhesion part 114 on the surface 110a. The bonding portion 114 is a hook-and-loop fastener such as Velcro (registered trademark), for example, and the holding member 112 illustrated in FIG. 2 is bonded thereto. Although not shown in FIG. 4, the planar coil unit 110 has an adhesive part for adhering to the coil pad 120 on the surface 110 b opposite to the surface 110 a. The adhesive portion is also a hook-and-loop fastener such as Velcro (registered trademark).

  The coil pad 120 is an elastic member such as a sponge formed of urethane foam or the like. The coil pad 120 has an adhesive portion 122 on a surface 120b having substantially the same shape as the surface 110b of the planar coil portion 110. The adhesion part 122 is a surface fastener such as a magic tape (registered trademark), for example, and adheres to an adhesion part formed on the surface 110 b of the planar coil part 110. That is, the bonding portion 122 formed on the surface 120b of the coil pad 120 and the bonding portion formed on the surface 110b of the planar coil portion 110 are bonded, whereby the coil pad 120 is bonded to the planar coil portion 110. The

  Moreover, as shown in FIG. 4, the coil pad 120 has the convex part 121 which protruded in the direction away from the surface 120a and the surface 120b on the surface 120a opposite to the surface 120b. In the example shown in FIG. 4, the coil pad 120 has a convex portion 121 at the center in the longitudinal direction of the surface 120a. That is, the coil pad 120 has the convex portion 121 at a position substantially symmetrical with the substrate portion 111 when the surface 120b that is the bonding surface with the planar coil portion 110 is a symmetrical surface. Thereby, when the planar coil part 110 and the coil pad 120 are adhere | attached, the board | substrate part 111 and the convex part 121 are arrange | positioned in the substantially plane symmetrical position. Here, although the symmetry plane is assumed to be the plane 120b, the symmetry plane may be the plane 120a or the plane 110a or 110b of the planar coil section 110.

  FIG. 5 is a top view and a cross-sectional view showing the coil pad of FIG. 5 is a top view showing the coil pad as viewed in the direction of arrow X1 shown in FIG. 4, and the lower view of FIG. 5 is a cross-sectional view showing the coil pad taken along the line I1-I1 of FIG. As shown in FIG. 5, the convex part 121 in 1st Embodiment is formed in the center part in the longitudinal direction of the surface 120a, and has the length substantially the same as the transversal direction of the surface 120a.

  FIG. 6 is a side view showing the receiving coil 100 of FIG. 4 in a curved state. In the example illustrated in FIG. 6, in the receiving coil 100 according to the first embodiment, both the planar coil unit 110 and the coil pad 120 are curved in a state where the coil pad 120 is bonded to the planar coil unit 110. In other words, the coil pad 120 bends together with the planar coil unit 110. At this time, the receiving coil 100 is curved in a region other than the region where the substrate unit 111 is provided. In the example shown in FIG. 6, the planar coil unit 110 has a region near the substrate unit 111 curved in the direction of the surface on which the coil pad 120 is mounted. Thus, since both the planar coil part 110 and the coil pad 120 are curved, even if the receiving coil 100 is curved, the substrate part 111 of the receiving coil 100 and the convex part 121 of the coil pad 120 are substantially the same. It is arranged at a plane symmetrical position.

  In the example shown in FIG. 6, the width of the convex portion 121 (length in the short direction) is preferably narrower than the width of the substrate portion 111 (length in the short direction). To explain this point, the area of the planar coil part 110 where the substrate part 111 is provided is an area that cannot be bent because it does not have flexibility. In other words, the planar coil unit 110 can be bent in a region other than the region where the substrate unit 111 is provided. At this time, when the width of the convex portion 121 is wider than the width of the substrate portion 111, the bendable range of the planar coil portion 110 may be limited. Therefore, when the width of the convex portion 121 is narrower than the width of the substrate portion 111, it is possible to prevent the bendable range of the planar coil portion 110 from being restricted, and the highly convenient receiving coil 100 can be realized. For this reason, the convex portion 121 has a shape that protrudes in a region that is substantially plane-symmetric with the non-flexible region of the planar coil unit 110 in a region narrower than the non-flexible region. It is desirable to be.

  FIG. 7 is a diagram showing an example of the receiving coil 100 of FIG. In the example illustrated in FIG. 7, the receiving coil 100 according to the first embodiment is bent and attached to the subject P so as to cover the right shoulder of the subject P. The receiving coil 100 is mounted so as to wrap and cover the right shoulder of the subject P when the holding member 112 is wound around the subject P. Specifically, the holding member 112 is attached to the planar coil unit 110 and attaches the planar coil 110 to the subject P in a state where the coil pad 120 is pressed against the subject P. Here, the receiving coil 100 is pulled toward the subject P by being attached to the subject P by the holding member 112. In other words, the receiving coil 100 is pulled in the direction approaching the subject P by the holding member 112. As a result, as shown in FIG. 7, the convex portion 121 formed on the coil pad 120 of the receiving coil 100 is pressed against the shoulder, which is the protruding portion of the subject P. Since the convex portion 121 of the coil pad 120 is an elastic body formed of urethane foam or the like, it is deformed so as to wrap the shoulder of the subject P.

  As described above, when the receiving coil 100 according to the first embodiment is attached to the protruding portion of the subject P, the protruding portion wraps the protruding portion 121 of the coil pad 120. As a result, the receiving coil 100 according to the first embodiment can be stably fixed to the subject P.

  As described above, according to the first embodiment, the receiving coil 100 can be stably fixed to the subject.

(Second Embodiment)
The coil pad and the planar coil device described in the first embodiment are not limited to the above example, and may be implemented in various different forms. In the second embodiment, another embodiment of the coil pad and planar coil device described in the first embodiment will be described.

[Position position]
In the first embodiment, as in the example shown in FIG. 4, an example is shown in which the substrate portion 111 is provided at the center of the planar coil portion 110 and the convex portion 121 is provided at the center of the coil pad 120. . However, the position of the board | substrate part 111 and the convex part 121 is not restricted to this example. This point will be described with reference to FIGS. 8 and 9. FIG. 8 is a diagram illustrating a modification of the first embodiment. 9 is a top view and a cross-sectional view showing the coil pad of FIG. 9 is a top view showing the coil pad as viewed in the direction of arrow X2 shown in FIG. 8, and the lower view of FIG. 9 is a cross-sectional view showing the coil pad taken along line I2-I2 of FIG.

  In the example illustrated in FIG. 8, the receiving coil 200 according to the modification includes a planar coil unit 210 and a coil pad 220. The planar coil unit 210 includes a substrate unit 211. Here, unlike the planar coil unit 110 illustrated in FIG. 4, the planar coil unit 210 illustrated in FIG. 8 includes a substrate unit 211 at a position other than the central portion in the longitudinal direction of the planar coil unit 210. In the example illustrated in FIG. 8, the planar coil unit 210 includes a substrate unit 211 in the vicinity of the center between the central portion in the longitudinal direction of the planar coil unit 210 and one end of the planar coil unit 210. As shown in FIGS. 8 and 9, the coil pad 220 protrudes at a substantially plane-symmetrical position with the substrate portion 211 of the planar coil portion 210 when the bonding surface with the planar coil portion 210 is a symmetrical surface. Part 221.

  FIG. 10 is a side view showing the receiving coil 200 of FIG. 8 in a curved state. In the example illustrated in FIG. 10, in the receiving coil 200, both the planar coil unit 210 and the coil pad 220 are curved in a state where the coil pad 220 is bonded to the planar coil unit 210. In other words, the coil pad 220 is curved together with the planar coil part 210. Thus, since both the planar coil part 210 and the coil pad 220 are curved, even if the receiving coil 200 is curved, the substrate part 211 of the receiving coil 200 and the convex part 221 of the coil pad 220 are substantially the same. It is arranged at a plane symmetrical position.

[Shape of convex part]
In the first embodiment, as in the example shown in FIG. 4, an example in which the convex portion 121 having a length substantially the same as the length of the coil pad 120 in the short direction is formed on the coil pad 120. Indicated. However, the shape of the convex portion 121 is not limited to this example. This point will be described with reference to FIG. FIG. 11 is a diagram illustrating a modification of the first embodiment. As in the example illustrated in FIG. 11, the receiving coil 300 according to the modification includes a substantially elliptical convex portion 321 that is shorter than the length of the coil pad 320 in the short direction.

[Shape of coil pad]
Moreover, in the said 1st Embodiment, the coil pad 120 which has the convex part 121 was attached to the planar coil part 110 so that attachment or detachment was possible like the example shown in FIG. However, the shape of the convex portion 121 is not limited to this example. This point will be described with reference to FIG. FIG. 12 is a diagram illustrating a modification of the first embodiment.

  As in the example illustrated in FIG. 12, the reception coil 400 according to the modification includes a planar coil unit 110 and a coil pad 421. The flat coil part 110 and the coil pad 421 have hook and loop fasteners such as Velcro (registered trademark) on the surfaces facing each other, and are detachably bonded by pressing both hook fasteners. Here, the coil pad 421 corresponds to the convex portion 121 shown in FIG. That is, in the example shown in FIG. 12, only the coil pad 421 corresponding to the convex part 121 of the coil pad 120 shown in FIG.

  In the example illustrated in FIG. 12, the receiving coil 400 does not include the coil pad 421 but may include a portion having the same shape as the coil pad 421 as an exterior. That is, the receiving coil 400 may not have the coil pad 421 that is detachably bonded, but may have a convex portion similar to the coil pad 421 illustrated in FIG. 12 as the shape of the receiving coil 400.

[Positional relationship between substrate and projection]
Further, the coil pads 120, 220, 320, and 412 described above do not have to be provided with a convex portion at a position that is substantially plane-symmetric with the substrate portion. For example, in the example illustrated in FIG. 4, the planar coil unit 110 is curved in a region other than the region where the substrate unit 111 is provided, and thus the coil pad 120 is convex at a position substantially plane-symmetric with the substrate unit 111. May not be bonded to the planar coil portion 110 so that the For example, the coil pad 120 may be bonded to the planar coil unit 110 such that the convex part 121 is disposed at a position that is substantially plane-symmetric with respect to the region where the planar coil unit 110 is curved.

[Coil pad members]
The coil pads 120, 220, 320, and 412 described above may include a member having a magnetic susceptibility between the magnetic susceptibility of the human body and the air (referred to as “intermediate member” hereinafter). Good. For example, these coil pads 120 and the like may include rice or the like as an intermediate member. As a result, the coil pad 120 and the like can prevent the high-frequency magnetic field from becoming non-uniform. In addition, when such an intermediate member is included in the coil pad 120, it is necessary to provide the coil pad 120 with a predetermined thickness. Therefore, an intermediate member may be included only in the convex portion of each coil pad having a predetermined thickness. In this way, by including the intermediate member in the convex portion and not including the intermediate member in the region other than the convex portion, the region other than the convex portion having a predetermined thickness is thickened in order to stably fix to the subject P. There is no need to do.

[Adhesive part]
Moreover, the coil pads 120, 220, 320, and 412 described above may not be bonded to the planar coil portion so as to be detachable by an adhesive portion such as a hook-and-loop fastener. Specifically, the coil pads 120, 220, 320, and 412 may be fixed to the planar coil portion by an adhesive portion to which an adhesive or the like is applied. For example, in the example shown in FIG. 4, an adhesive or the like is applied to the bonding portion 122 formed on the surface 120 b of the coil pad 120 and is bonded to the bonding portion formed on the surface 110 b of the planar coil portion 110. The coil pad 120 may be fixed to the planar coil part 110 by applying an agent or the like and bonding the two adhesive parts.

[Transmitting coil]
In addition, the coil pads 120, 220, 320, and 412 described above may not be attached to the planar coil portion that is a reception coil, and a planar transmission coil that detects a magnetic resonance signal emitted from a subject, You may attach to the planar coil for both transmission and reception which performs both generation | occurrence | production of a high frequency magnetic field, and detection of a magnetic resonance signal. That is, the coil pads 120, 220, 320, and 412 described above can be applied to a planar coil device such as a reception coil, a transmission coil, and a transmission / reception coil formed by a planar coil.

  As described above, according to the first and second embodiments, the planar coil device can be stably fixed to the subject.

  Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the technical scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the technical scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 MRI apparatus 100 Reception coil 110 Plane coil part 111 Substrate part 112 Holding member 120 Coil pad 121 Convex part 122 Adhesion part

Claims (5)

An adhesive portion that adheres to a surface of a flexible planar coil that generates a high-frequency magnetic field and detects a magnetic resonance signal emitted from the subject, or detects a magnetic resonance signal emitted from the subject;
A coil pad comprising: an elastic member having an adhesive surface on which the adhesive portion is formed, and protruding in a direction away from the adhesive surface. The elastic member is
The adhesive surface which is a surface having substantially the same shape as the surface of the planar coil, and a part of the surface opposite to the adhesive surface is raised in a direction away from the adhesive surface. Coil pad. A flexible planar coil for generating a high-frequency magnetic field and detecting a magnetic resonance signal emitted from the subject or detecting a magnetic resonance signal emitted from the subject;
A planar coil device comprising: an elastic member raised in a direction away from one surface of the planar coil. The planar coil is
Having a non-flexible region on the surface opposite to the one surface;
The elastic member is
4. The planar coil device according to claim 3, wherein when the one surface is a symmetrical surface, the planar coil device is disposed at a position that is substantially plane-symmetric with respect to the non-flexible region. 5. The holding member for attaching the planar coil to the subject in a state of being bonded to the planar coil and the elastic member being pressed against the subject. Planar coil device.

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