JP3086694B2 - Method of manufacturing gradient magnetic field coil for MRI apparatus - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial application field) The present invention relates to a method for manufacturing a gradient magnetic field coil for an MRI apparatus.

(Prior Art) In an MRI apparatus, Gx, Gy, Gz gradient magnetic fields generated by Gx, Gy, Gz gradient magnetic field coils are arranged in a static magnetic field. The slice position of the subject is specified by the combination of the gradient magnetic fields of Gx, Gy, and Gz, and a tomographic image of the slice position is obtained.

The Gx and Gy gradient magnetic field coils include a plurality of saddle coils, and the Gz gradient magnetic field coils include a solenoid coil. The accuracy of the slice position largely depends on the position accuracy of these saddle coils and solenoid coils.

By the way, conventionally, the saddle coil is buried in a curved resin molded product. The manufacturing process is as follows. The wire of the saddle coil is temporarily fixed to the flat surface of the mold by a pin. The resin is poured into the flat surface of the mold and cured, and as a result, a flat resin molded product in which the saddle coil is embedded is formed. This resin molded product is removed from the mold, and then curved into a predetermined curved shape.

A plurality of resin molded products in which a plurality of saddle coils are embedded and a separately formed solenoid coil are embedded in a cylindrical resin molded product to form Gx, Gy, and Gz gradient magnetic fields.

(Problems to be Solved by the Invention) However, the position of the wire rod of the saddle coil is only restricted by the pin. Therefore, there is a problem in that the positioning of the wire is poor, and the positional accuracy of the formed saddle coil is poor, and as a result, the accuracy of the slice position is poor.

In particular, the position of the wire rod is regulated by a pin in a direction parallel to the flat surface of the mold, but in a direction perpendicular to the flat surface,
The position of the wire is not restricted by the pins. Therefore, the wire may undulate in the vertical direction, and the position accuracy in the vertical direction is particularly poor.

Further, the resin component in which the saddle coil is embedded is once formed flat and then curved. for that reason,
The positional accuracy of the saddle coil during this bending is not very good. Further, when the rigidity of the wire is high, the positional accuracy of the wire is worse.

An object of the present invention is to provide a method of manufacturing a gradient magnetic field coil for an MRI apparatus, in which the positional accuracy of each gradient magnetic field coil is increased, and as a result, the accuracy of a slice position of a subject is improved.

[Constitution of the Invention] (Means for Solving the Problems) The present invention relates to a method for manufacturing a gradient magnetic field coil for an MRI apparatus having a plurality of saddle coils and a solenoid coil. A first mold having a groove formed therein and a second mold to be fitted into the first mold;
(B) storing the wire assembly in the groove of the first mold, and positioning the wire assembly in the groove; and (c) wire the cloth impregnated with the adhesive. (D) fitting the second mold to the first mold and pressing the wire assembly into the groove by the second mold; and (e) curing the adhesive. Bonding the wire assembly to the fabric, thereby forming a saddle coil assembly having the fabric and the wire assembly; and (f) removing the saddle coil assembly from the first and second molds. (G) a step of manufacturing a plurality of saddle coil assemblies by the steps (a) to (f); and (h) a cylindrical mold, and the cylindrical mold should be inserted into the cylindrical mold. (I) temporarily fixing a plurality of saddle coil assemblies to the core mold; Forming a solenoid coil by winding a wire assembly around the core; and (j) inserting a core mold into the cylindrical mold to insert a plurality of saddle coils into a cylindrical space formed between the two molds. (K) injecting and curing a resin into a cylindrical space to form a cylindrical resin member in which a plurality of saddle coil assemblies and the solenoid coil are embedded; (L) a method for producing a gradient magnetic field coil for an MRI apparatus, comprising: a step of taking out the resin member from a core mold and a cylindrical mold.

(Operation) In the present invention, the saddle coil is formed by positioning the wire by the groove of the first mold. The spatial position of the saddle coil depends on the position of the first type of groove. Therefore, the positioning accuracy of the wire assembly is good, and the spatial positioning accuracy of the saddle coil is good. Further, the wire is positioned by the guide to form a solenoid coil. Therefore, since the saddle coil and the solenoid coil have high positional accuracy, the slice positional accuracy of the subject is improved as compared with the related art.

(Examples) Hereinafter, the present invention will be described specifically with reference to examples.

FIG. 1 is an explanatory diagram of each gradient coil obtained by the manufacturing method of the present invention.

As shown in FIG. 1A, the Gx gradient magnetic field coil includes four saddle coils 1 corresponding to the x-axis direction. The Gy gradient magnetic field coil also includes four saddle coils 1 facing each other in the y-axis direction, as shown in FIG. 1B. The Gz gradient coil is shown in Fig. 1 (C).
As shown in FIG. 3, the solenoid coil 2 covers the z-axis.

The Gx, Gy, Gz gradient magnetic field coil assembly is composed of a tubular member formed by superposing the saddle coil 1 and the solenoid coil 2 on each other.

Next, a method of manufacturing the saddle coil assembly will be described with reference to FIGS.

As shown in FIG. 2, a wire assembly 10 is prepared.
The wire assembly 10 includes a plurality of wires 11 twisted with each other,
A glass cloth 12 made of an insulating material covering these wires 11 is provided. The wire 11 is formed of a conductive substance, for example, copper, and the surface of the wire 11 is covered with an electrically insulating member. Further, the glass cloth 12 is impregnated with an adhesive. Further, an adhesive may be applied to the glass cloth in a later step.

Next, as shown in FIG. 3 and FIG.
Prepare 13 A wire assembly is provided on the surface of the first mold 13.
A groove 14 having a width corresponding to the width of 10 is formed. When the saddle coil is wound in a single layer, the depth of the groove 14 is equal to the thickness of one wire rod assembly 10,
When the saddle coil is wound in two layers, two wire assemblies
10 is equal to the thickness.

As shown in FIGS. 5, 6, and 7, the wire rod assembly 10 is fitted into the groove 14. As shown in FIG. At this time, the wall of the groove 14 is subjected to a release treatment (for example, a fluororesin coating) so that the adhesive applied to the wire assembly 10 does not adhere to the wall of the groove 14.

As shown in FIGS. 6 and 7, a glass cloth 15 impregnated with an adhesive is put on the first mold 13.

As shown in FIG. 8, the second mold 16 is fitted to the first mold 13. At this time, the first and second dies 13 and 16 are firmly fixed to each other by the plurality of bolts 19. As a result, the wire assembly 10 is pressed into the groove 14.

In the state shown in FIG. 9, the first and second molds 1
3,16 are heated. As a result, the wire assemblies 10
In addition, the wire assembly 10 and the glass cloth 15 are bonded. At the same time, the glass cloth 15 cures the adhesive,
Changed to a hard plate. Thus, a saddle coil assembly 17 including the wire assembly 10 and the glass cloth 15 is formed.

At this time, since the wall of the groove 14 has been subjected to the release processing, the wire assembly 10 is not bonded to the wall of the groove 14.

As shown in FIG. 10, the saddle coil assembly 17
Removed from the first and second molds 13,16.

A plurality of such saddle coil assemblies 17 are manufactured,
As described later, it is used for manufacturing a Gx, Gy, Gz gradient coil assembly.

As described above, the wire rod assembly 10 is positioned by the groove 14 of the first die 13 to form the saddle coil assembly 17. That is, the side wall of the groove 14 positions the wire assembly 10 in the direction l in FIG. 9, and the lower surface of the second die 16 and the bottom wall of the groove 14 allow the wire assembly 10 to move in the direction m in FIG. Is positioned at The spatial position of the saddle coil depends on the position of the first type of groove. Therefore, the positioning accuracy of the wire assembly is good, and the spatial positioning accuracy of the saddle coil is good. Therefore, the slice position accuracy of the subject is improved as compared with the related art.

Next, with reference to FIG. 11 to FIG. 18, Gx, G
A method for manufacturing the y, Gz gradient coil assembly will be described.

As shown in Fig. 11, cylindrical bobbin (core type)
Prepare 21. A glass cloth 22 is wound around the bobbin 21. At this time, the surface of the bobbin 21 is subjected to a release treatment so that an epoxy resin described later does not adhere to the surface of the bobbin 21.

As shown in FIG. 12, a plurality of saddle coil assemblies 17 manufactured by the above-described method
Temporarily fixed on This temporary fixing means is pinning,
Any means such as bonding may be used.

As shown in FIG. 13, a glass cloth 23 is wound on the plurality of saddle coil assemblies 17.

Next, as shown in FIGS. 14 to 16, the solenoid coil 2 is manufactured.

That is, the guide 24 shown in FIG. 14 is attached to the bobbin 21 shown in FIG. This guide 24
And fins 26 arranged at intervals corresponding to the width of the wire assembly 10 of the solenoid coil 2. Further, the substrate 25 has a curvature corresponding to the curvature of the bobbin 21.

As shown in FIG. 16, the wire assembly 10 is inserted between the fins of the plurality of guides 24 so that the wire assembly 10 is inserted.
Is wound on the glass cloth 23 of the bobbin 21. Thereby, the solenoid coil is completed.

As described above, the plurality of saddle coil assemblies and the solenoid coil are temporarily fixed to the bobbin by the steps shown in FIGS. 11 to 16.

Next, as shown in FIG. 17, a cylindrical mold 27 is prepared. A bobbin 21 to which a plurality of saddle coil assemblies 17 and a solenoid coil 29 are temporarily fixed is inserted into the mold 27. Thereby, an annular space is provided between the bobbin 21 and the mold 27.
28, a plurality of saddle coil assemblies 17 and a solenoid coil 29 are located in the annular space 28.

Uncured epoxy resin is injected into this annular space 28 and cured. As a result, a tubular resin member (that is, a Gx, Gy, Gz gradient coil assembly) 30 in which a plurality of saddle coil assemblies and solenoid coils are embedded is formed. Note that another resin may be used instead of the epoxy resin.

As shown in FIG. 18, the gradient coil assembly 30
Is removed from the bobbin 21 and the mold 27.

As described above, since the solenoid coil is also accurately positioned and formed, the slice position accuracy of the subject is improved as compared with the related art.

Further, the glass cloth 2 used in FIG. 11 and FIG.
The purpose of 1,22 is to insulate the saddle coil and the solenoid coil and to increase the strength of the gradient coil assembly 30 by infiltrating the glass cloths 21,22 with epoxy resin. Note that an electric insulating plate may be used instead of the glass cloths 21 and 22.

Further, the saddle coil and the solenoid coil are fixed by the epoxy resin. Therefore, the coil is prevented from vibrating due to the electromagnetic force generated in the coil.

Next, a method of manufacturing the shielded gradient coil assembly will be described with reference to FIGS.

This shield type gradient magnetic field coil assembly is a normal Gx, Gy, Gz
In addition to the gradient coil assemblies, canceling Gx, Gy, canceling the leakage magnetic field generated from these coil assemblies
A Gz gradient coil assembly is provided. Cancel Gx, G
The y, Gz gradient coil assembly also includes a saddle coil and a solenoid coil.

 As shown in FIG. 19, a pipe 31 is prepared.

As shown in FIG. 20, on the pipe 31, the guide 24
Is disposed, and the wire assembly 10 is wound. This allows
Solenoid coil for cancel coil pipe 31
Is temporarily fixed.

As shown in FIG. 21, a saddle coil assembly 17 for a cancel coil is temporarily fixed on the pipe 31, and a glass cloth 32 is wound thereon.

As shown in FIG. 22, the bobbin 21 to which the saddle coil assembly and the solenoid coil are temporarily fixed is inserted into the pipe 31 thus formed.

Next, as shown in FIG. 23, the bobbin 21
And the pipe 31 are inserted. Between bobbin 21 and mold 33,
An annular space 34 is defined. In the annular space 34, a saddle coil assembly and a solenoid coil 35 for a normal magnetic field coil, a pipe 31, and a saddle coil assembly and a solenoid coil 36 for a cancel coil are located.

An uncured epoxy resin is injected into the annular space 34 and cured. This allows the saddle coil assembly and solenoid coil 35 for a normal magnetic field coil to be used.
, A pipe 31, a saddle coil assembly for a cancel coil and a solenoid coil 36, a tubular resin member in which a plurality of saddle coil assemblies and a solenoid coil are embedded (shielded gradient magnetic field coil assembly). 37 is formed.

As shown in FIG. 24, the shielded gradient coil assembly 37 is removed from the bobbin 21 and the mold 33.

Thus, the shielded gradient coil assembly is also positioned and formed accurately. Therefore, the slice position accuracy of the subject is improved as compared with the related art.

Next, another manufacturing method of the saddle coil assembly will be described with reference to FIGS. 25 to 29.

As shown in FIG. 25, a first mold 41 is prepared. The first mold 41 has a uniform thickness and is an arc-shaped mold. On the upper surface of the first die 41, a groove 42 corresponding to a saddle-shaped wiring pattern is formed by NC machining.

As shown in FIG. 26, in the groove 42 of the first mold 41,
The wire 43 is stored.

As shown in FIG. 27 and FIG.
Then, the second mold 44 is fitted. The second mold 44 has a uniform thickness, and the lower surface of the second mold 44 is
It is formed in an arc shape corresponding to the upper surface of 41.

As shown in FIG. 28, a projection 45 is formed on the lower surface of the second mold 44 at a position corresponding to the groove 42 of the first mold 41. Thus, when the second mold 44 is fitted to the first mold 41, the protrusion 45 presses the wire 43. Therefore, the wire rod 43
Is prevented from waving.

Further, a space 46 is defined between the first mold 41 and the second mold 44. Epoxy resin is injected into this space 46 in a vacuum state. This epoxy resin is cured and the 29th
As shown in the figure, an arc-shaped resin molded product 47 (saddle coil assembly) in which saddle coils are embedded is formed.
In order to improve the flow of the resin, a connecting passage connecting adjacent grooves is formed.

Further, the first and second dies 41 and 44 may be formed as shown in FIG. That is, instead of the second mold being provided with a projection, a wire 43 accommodated in the groove 42 is provided.
A spacer 48 is arranged between the lower surface of the second mold 44 and the second mold 44. As a result, the wire 43 is pressed between the spacer 48 and the groove 42.

A plurality of such saddle coil assemblies 47 are manufactured,
A Gx, Gy, Gz gradient coil assembly or a shielded gradient coil assembly is manufactured by any of the methods described above.

31 to 33 show another method of manufacturing the Gx, Gy, Gz gradient coil assembly.

As shown in FIG. 31, a bobbin 21 is prepared, and an insulating sheet 51 is wound around the bobbin 21.

As shown in FIG. 32, guide for solenoid coil
Prepare 52. The wire is wound on the insulating sheet 52 such that the wire is engaged with the groove 53 of the guide 52. At this time, the wire may be positioned by the spacer 54.

As shown in FIG. 33, a plurality of saddle coil assemblies
47 is arranged by bolt 55. Thereafter, as described above, the bobbin is inserted into the mold, resin is injected between the bobbin and the mold, and the Gx, Gy, Gz gradient coil assembly is completed.

In the above-described embodiment, the gradient coil assembly including the saddle coil and the solenoid coil is formed. However, the gradient coil assembly including only the saddle coil or the gradient coil assembly including only the solenoid coil is provided. Can also be manufactured according to the present invention.

Furthermore, although the method of manufacturing the shielded gradient coil assembly has been described, the manufacturing method can be applied to a gradient coil assembly having a plurality of saddle coil assemblies and solenoid coils having greatly different diameters.

[Effect of the Invention] According to the present invention described in detail above, the wire rod is positioned by the groove of the first mold to form the saddle coil, and the spatial position of the saddle coil is determined by the groove of the first mold. Depends on the position. Therefore, the positioning accuracy of the wire assembly is good, and the spatial positioning accuracy of the saddle coil is good. Furthermore, since the wire is positioned by the guide and the solenoid coil is formed, the positional accuracy of the saddle coil and the solenoid coil is improved, and the effect of improving the slice positional accuracy of the subject is obtained.

[Brief description of the drawings]

1 (A), 1 (B) and 1 (C) are perspective views showing Gx, Gy and Gz gradient magnetic field coils, respectively, and FIGS. 2 to 10 are views showing a manufacturing process of a saddle coil assembly. FIG. 2 is a perspective view of the wire assembly, FIG. 3 is a perspective view of the first mold, and FIG.
FIG. 5 is a sectional view of the first mold, and FIG.
FIG. 6 is a perspective view of a first mold showing a state of being attached to the mold of FIG.
The figure shows the first with the glass cloth and wire assembly attached.
7, FIG. 7 is an enlarged sectional view of a portion VII of FIG. 6, and FIG. 8 is a sectional view of the first and second molds when the second mold is fitted into the first mold. FIG. 9 is a perspective view, and FIG.
Sectional view of the first and second molds in a state fitted to the mold,
FIG. 10 is a perspective view of the saddle coil assembly, and FIGS. 11 to
FIG. 18 is a view showing a manufacturing process of the gradient coil assembly, FIG. 11 is a perspective view of a bobbin around which a glass cloth is wound, and FIG. 12 is a state where the saddle coil assembly is temporarily fixed. FIG. 13 is a perspective view of a bobbin around which a glass cloth is wound, FIG. 14 is a perspective view of a guide, FIG.
FIG. 16 is a perspective view of a bobbin to which a guide is attached, FIG. 16 is a perspective view of the bobbin when the wire assembly is wound around the bobbin, FIG.
17 is a cross-sectional view of a bobbin and a cylindrical mold, FIG. 18 is a cross-sectional view of a gradient coil assembly, and FIGS. 19 to 24 are diagrams showing a manufacturing process of a shielded gradient magnetic field assembly. FIG. 19 is a perspective view of the pipe, FIG. 20 is a perspective view of the bobbin when the wire assembly is wound around the bobbin, and FIG. 21 is a perspective view of the bobbin around which the glass cloth is wound. Figure, Figure 22 is a perspective view of the bobbin and pipe when the bobbin is inserted into the pipe,
23 is a cross-sectional view of a bobbin and a cylindrical mold, FIG. 24 is a cross-sectional view of a shielded gradient coil assembly, and FIGS. 25 to 29 show another manufacturing process of a saddle coil assembly. 25 is a perspective view of the first mold, FIG. 26 is a perspective view of the first mold when the wire is attached to the first mold, and FIG. 27 is a perspective view of the second mold. FIG. 28 is a perspective view of the first and second molds when the second mold is fitted to the first mold, and FIG. 28 shows the first and second molds in a state where the second mold is fitted to the first mold. FIG. 29 is a sectional view of the second mold.
FIG. 30 is a perspective view of the saddle coil assembly, FIG. 30 is a cross-sectional view of another first and second molds, and FIGS. 31 to 33 are views showing another manufacturing process of the gradient coil assembly. FIG.
FIG. 32 is a perspective view of a bobbin on which an insulating sheet is wound, FIG. 32 is a perspective view of a bobbin on which a solenoid coil is formed, and FIG.
The figure is a perspective view of a bobbin to which a saddle coil assembly and a solenoid coil are temporarily fixed. DESCRIPTION OF SYMBOLS 1 ... Saddle coil, 2 ... Solenoid coil, 10 ... Wire rod assembly, 11 ... Wire rod, 12 ... Glass cloth, 13 ... First mold, 14 ... Groove, 15 ... Glass cloth, 16 ... Second type, 17... Saddle coil assembly.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-308533 (JP, A) JP-A 62-55311 (JP, U) JP-A 63-120612 (JP, U) (58) Investigation Field (Int.Cl. ⁷ , DB name) A61B 5/055

Claims (7)

(57) [Claims] 1. A method of manufacturing a gradient magnetic field coil for an MRI apparatus having a plurality of saddle coils and a solenoid coil, comprising: (a) a first mold having a groove formed corresponding to a shape of a saddle coil; The second to be fitted to the first mold
(B) storing the wire assembly in the groove of the first mold, and positioning the wire assembly in the groove; and (c) wire the cloth impregnated with the adhesive. (D) fitting the second mold to the first mold and pressing the wire assembly into the groove by the second mold; and (e) curing the adhesive. Adhering the wire assembly to the fabric, thereby forming a saddle coil assembly having the fabric and the wire assembly; and (f) removing the saddle coil assembly from the first and second molds. (G) a step of manufacturing a plurality of saddle coil assemblies by the steps (a) to (f); and (h) a cylindrical mold, and the cylindrical mold should be inserted into the cylindrical mold. (I) temporarily fixing a plurality of saddle coil assemblies to the core mold; Winding the wire assembly to form a solenoid coil; and (j) inserting the core mold into the cylindrical mold to form a plurality of saddle coil sets in a cylindrical space formed between the two molds. (K) injecting and curing a resin in a cylindrical space to form a cylindrical resin member in which a plurality of saddle coil assemblies and the solenoid coil are embedded; (L) a method of manufacturing a gradient magnetic field coil for an MRI apparatus, comprising: a step of taking out the resin member from a core mold and a cylindrical mold. 2. A method for manufacturing a gradient magnetic field coil for an MRI apparatus according to claim 1, wherein the wire assembly includes a plurality of wires twisted with each other and a cloth coated with the wires and coated with an adhesive. . 3. The method of manufacturing a gradient magnetic field coil for an MRI apparatus according to claim 1, wherein said step (i) includes a step of forming a solenoid coil by winding the wire assembly into a core using a guide. 4. An MRI apparatus comprising: a plurality of first saddle coils and a first solenoid coil; and a plurality of second saddle coils and a second solenoid coil disposed radially outward of these coils. (A) a first mold having a groove formed corresponding to the shape of a saddle coil, and a second mold to be fitted to the first mold.
(B) storing the wire assembly in the groove of the first mold, and positioning the wire assembly in the groove; and (c) wire the cloth impregnated with the adhesive. (D) fitting the second mold to the first mold and pressing the wire assembly into the groove by the second mold; and (e) assembling the wire into the cloth. Bonding the three-dimensional body to form a saddle coil assembly having a cloth and a wire rod assembly; (f) removing the saddle coil assembly from the first and second molds; and (g) the step (a). And (f) producing a plurality of first and second saddle coil assemblies; and (h) preparing a core mold and temporarily fixing the plurality of first saddle coil assemblies to the core mold. And winding the wire assembly around a core mold to form a first solenoid coil; and (i) connecting the pipe Preparing and temporarily fixing a plurality of second saddle coil assemblies to the pipe, and winding the wire assembly around the pipe to form a second solenoid coil; (j) forming a core mold in the pipe; (K) preparing a cylindrical mold, inserting a pipe and a core mold into the cylindrical mold, and inserting the pipe and the core mold into a cylindrical space formed between the core mold and the cylindrical mold. Positioning the first saddle coil assembly, the first solenoid coil, the pipe, the second saddle coil assembly, and the second solenoid coil; (l) injecting resin into the cylindrical space; Curing to form a cylindrical resin member in which the first saddle coil assembly, the first solenoid coil, the pipe, the second saddle coil assembly, and the second solenoid coil are embedded; ) Remove the resin member from the core mold and cylindrical mold. Manufacturing method for an MRI apparatus gradient coil and having a to process. 5. A method for manufacturing a gradient magnetic field coil for an MRI apparatus having a plurality of saddle coils and a solenoid coil, comprising: (a) a first mold having a groove formed corresponding to a shape of a saddle coil; The second to be fitted to the first mold
(B) storing a wire in the groove of the first mold and positioning the wire in the groove; (c) fitting the second mold to the first mold. (D) pressing the wire into the groove by the second mold; and (d) injecting resin into the space and the groove formed between the first and second molds; (C) curing the resin to form a resin member in which the wire is embedded; (f) removing the resin member from the first and second molds; and (g) the steps (a) to (f). (H) preparing a cylindrical mold and a core mold to be inserted into the cylindrical mold; and (i) preparing a plurality of saddle coil assemblies. Temporarily fixing the coil assembly to a core mold and winding a wire around the core mold to form a solenoid coil; and (j) connecting the core mold to a cylinder. (K) injecting resin into the cylindrical space by inserting the plurality of saddle coil assemblies and the solenoid coil into the cylindrical space formed between the two molds by inserting the saddle coil assembly into the cylindrical space; And curing to form a cylindrical resin member in which a plurality of saddle coil assemblies and solenoid coils are embedded; and (l) a step of removing the resin member from a core mold and a cylindrical mold. Of manufacturing a gradient magnetic field coil for an MRI apparatus. 6. A method of manufacturing a saddle coil assembly for an MRI apparatus, comprising: (a) a first mold having a groove formed corresponding to a shape of a saddle coil, and fitted to the first mold. Second to be
(B) storing the wire assembly in the groove of the first mold, and positioning the wire assembly in the groove; and (c) wire the cloth impregnated with the adhesive. (D) fitting the second mold to the first mold and pressing the wire assembly into the groove by the second mold; and (e) assembling the wire into the cloth. Bonding a solid to form a saddle coil assembly having a cloth and a wire assembly; and (f) removing the saddle coil assembly from the first and second molds. Manufacturing method. 7. A method of manufacturing a saddle coil assembly for an MRI apparatus, comprising: (a) a first mold having a groove formed corresponding to a shape of a saddle coil, and fitted to the first mold. Second to be
(B) storing a wire in the groove of the first mold and positioning the wire in the groove; (c) fitting the second mold to the first mold. (D) pressing the wire into the groove by the second mold; and (d) injecting resin into the space and the groove formed between the first and second molds; (C) curing the resin to form a resin member in which the wire is embedded; and (f) removing the saddle coil assembly from the first and second molds to manufacture a saddle coil assembly for an MRI apparatus. Method.