JP2005185785A - Superconducting magnet apparatus and magnetic resonance imaging equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve opening performance between cryostats and facilitate to receive a load applied to a connecting pillar section between the cryostats in a superconducting magnet apparatus and magnetic resonance imaging equipment. <P>SOLUTION: This superconducting magnet apparatus is provided with the connecting pillar section 5 extending over and connecting the first and second cryostat sections 2 and 4 incorporating superconducting coils. The connecting pillar section has an approximately rectangular shape in a part of the connecting pillar section corresponding to a uniform static magnetic field space area 8 viewed in the extending direction, the connecting pillar section extends in the radial direction of the superconducting coils over the inside/outside the first and second cryostat sections, and the width of the connecting pillar section in the circumferential direction of the superconducting coils is so formed that a side W2 farther than the front side W1 facing the uniform static magnetic space area from the uniform static magnetic field space area is made wider inside the first and second cryostat sections in the radial direction of the superconducting coils. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a superconducting electromagnet apparatus and a magnetic resonance imaging apparatus used in an MRI (Magnetic Resonance Imaging) apparatus (commonly referred to as “magnetic resonance imaging apparatus”) used for diagnostic imaging of a living body.

  In a magnetic resonance imaging apparatus using a superconducting electromagnet apparatus, a cylinder is roughly classified according to the shape of a cryostat having a built-in superconducting coil, and an opposing form that forms a spherical uniform static magnetic field space region between a pair of cryostats. In recent years, the facing type, which is excellent in terms of the openness to the subject and the convenience of access to the subject by the diagnostic personnel, is becoming mainstream. In this opposed magnetic resonance imaging apparatus, the strength of the magnetic field in the spherical uniform static magnetic field space region is generally around 6000 to 10000 gauss, and its tolerance is usually several ppm. The size and weight of the opposing magnetic resonance imaging apparatus are, for example, about 3 m in height, about 2 m in maximum depth in the plane, and about 40 tons in weight.

  In the opposed magnetic resonance imaging apparatus as described above, a vertical type in which a pair of cryostats are arranged in the vertical direction is the mainstream. For example, Japanese Patent Application Laid-Open No. 9-262223 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2002-2002. As shown in Japanese Patent Laid-Open No. 17709 (Patent Document 2), two cylinders support the upper cryostat and receive a large mutual attractive force generated between a pair of upper and lower cryostats.

Japanese Patent Laid-Open No. 9-262223 (FIG. 1 (b) and description thereof) JP 2002-17709 A (FIG. 6 and its description)

  In the magnetic resonance imaging apparatus of Patent Document 1, since two cylinders are disposed inside the cryostat in the radial direction, when the subject's bed is passed between the two cylinders. The two pillars in the immediate vicinity feel the subject narrow, that is, the openness is not so good, and some people feel a sense of fear. In addition, since there is a column in the immediate vicinity of the subject, the column becomes an obstacle when accessing the subject by the diagnostic personnel, and the convenience of access to the subject by the diagnostic personnel is not good.

  In the magnetic resonance imaging apparatus of Patent Document 2, since two cylinders are arranged on the outer side in the radial direction of the cryostat, the distance from the center of the cryostat to the center of the cylinder is long, and the upper cryostat is supported. In addition, in order to receive a large mutual suction force generated between a pair of upper and lower cryostats, a cylinder with a large diameter as shown in FIG. The two pillars having a large diameter are in the way of access, that is, the openness is not so good, and the convenience of access to the subject at the time of diagnosis by the diagnostic personnel is not good.

  The present invention has been made in view of the above-described circumstances. In the superconducting electromagnet apparatus and the magnetic resonance imaging apparatus, the openness between the cryostats is improved, and the load applied to the connecting column part between the cryostats is received. The purpose is to make it easier.

  In the superconducting electromagnet device according to the present invention, the first and second cryostat portions each containing a liquid refrigerant cooled by a refrigerator are provided between the first and second cryostat portions. A superconducting electromagnet having a connecting column portion extending and connected across the first and second cryostat portions so that a space in which a uniform static magnetic field space region is formed by an annular superconducting coil built in the cryostat portion is formed In the apparatus, a shape of the connecting column portion corresponding to the uniform static magnetic field space region as viewed in the extending direction is substantially rectangular, and the connecting column portion is arranged in the radial direction of the superconducting coil in the first and second directions. The width of the superconducting coil in the circumferential direction of the connecting column portion is extended from the front side facing the uniform static magnetic field space region. Serial in which a person far from uniform static magnetic field space region are widely in the superconducting within said first and second cryostat portion in the radial direction of the coil.

  According to the present invention, first and second cryostat portions each containing liquid refrigerant cooled by a refrigerator are provided in the first and second cryostat portions between the first and second cryostat portions. In the superconducting electromagnet apparatus comprising a connecting column portion that extends and connects across the first and second cryostat portions so that a space in which a uniform static magnetic field space region exists by an annular superconducting coil is formed. The shape of the column portion corresponding to the uniform static magnetic field space region as viewed in the extending direction is substantially rectangular, and the connecting column portion is arranged in the radial direction of the superconducting coil inside and outside the first and second cryostat portions. And extending the circumferential width of the superconducting coil of the connecting column portion from the front side facing the uniform static magnetic field space region. Since the far side is widened in the first and second cryostats in the radial direction of the superconducting coil, the openness between the cryostats is good, and the load applied to the connecting pillars between the cryostats is easily received. There is an effect that can be done.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to FIGS. FIG. 1 is a plan view showing an example of the configuration of the main part of the entire opposing magnetic resonance imaging apparatus, and FIG. 2 is a longitudinal side view of the section taken along the line II-II in FIG. 3 is a cross-sectional plan view of the section taken along the line III-III in FIG. 2 as viewed in the direction of the arrow. FIG. It is explanatory drawing of the effect of Embodiment 1. In addition, in each figure, the same code | symbol shows the same part.

  First, the overall structure and function of the first embodiment of the present invention will be described.

  1 to 2, an opposing magnetic resonance imaging apparatus includes a first cryostat portion 2 having an annular first superconducting coil 1 and having a cylindrical appearance, and an annular second superconducting coil 3. And the second cryostat portion 4 having a cylindrical appearance and extending across the first cryostat portion 2 and the second cryostat portion 4 and the first cryostat portion 2 and the second cryostat portion 2. It is comprised from the connection pillar part 5 which connects the cryostat part 4 in the outer peripheral part of each cryostat part 2 and 4. FIG.

  The first cryostat unit 2 and the second cryostat unit 4 are arranged so that the centers 6 of the annular first and second superconducting coils 1 and 3 are coaxial as shown in the figure. A predetermined space 7 is held between the opposing surfaces of the two by the connecting column portion 5. Note that a spherical uniform static magnetic field space region 8 necessary for image diagnosis of the subject exists in the space 7. In addition, a subject bed 71 on which the subject is placed is inserted into the space 7 in the direction of arrow a (see FIG. 1) or arrow b (see FIG. 1).

  As is well known, the first cryostat unit 2 includes a vacuum container unit 201 made of nonmagnetic metal, and helium (within the vacuum container unit 201 spaced apart from the wall of the vacuum container unit 201). He) a refrigerant container (not shown) such as a container and a space between the refrigerant container (not shown) and the vacuum container part 201 and spaced from the refrigerant container (not shown) and the vacuum container part 201. It mainly comprises a heat shield (not shown) that blocks radiant heat from the vacuum vessel 201 to the refrigerant container (not shown). The first superconducting coil 1 is built in the refrigerant container (not shown).

  The vacuum vessel portion 201 includes a nonmagnetic cylindrical portion 2011 that is coaxial with the center 6, disk-like nonmagnetic end wall portions 2012 and 2013 provided at both ends of the cylindrical portion 2011, and the cylinder A non-magnetic peripheral wall portion 2014 that surrounds the portion 2011 and extends across the peripheral surfaces of the both end wall portions 2012 and 2013 is formed.

  The end wall portion 2013 on the space 7 side has a bottom wall portion 20131 forming a circular recess 20131 whose center is coaxial with the center 6 of the spherical uniform static magnetic field space region 8 on the space 7 side. And a peripheral wall portion 201312 is provided. That is, in other words, the end wall portion 2013 on the space 7 side has a structure in which the vicinity of the outer peripheral portion protrudes toward the space 7 side, and the peripheral wall portions 2014 and 201312 connected to the protruding circular wall portion 2015 A donut-shaped recess 2016 is formed inside the vacuum vessel 201 by the circular wall portion 2015. In the donut-shaped recess 2016, the first superconducting coil 1 built in the refrigerant container (not shown) in the vacuum container portion 201 is disposed.

  In the first cryostat portion 2, an annular first adjusting magnet 91 is provided between the first superconducting coil 1 and the cylindrical portion 2011 so as to face the bottom wall portion 201311 of the circular recess 20131. It is arranged. In other words, the first adjusting magnet 91 surrounds the cylindrical portion 2011 and is surrounded by the first superconducting coil 1, and its center line is coaxial with the center line 6. As the first adjustment magnet 91, for example, a superconducting coil built in the refrigerant container (not shown) in the vacuum container 201 is used.

  In the first cryostat portion 2, annular outer field magnetic field canceling magnets 10 and 11 that are coaxial with the coaxial 6 are provided. These outer field magnetic field canceling magnets 10 and 11 include a superconducting coil built in the refrigerant container (not shown) in the vacuum container part 201 or the inside of the vacuum container part 201 outside the refrigerant container (not shown). The non-superconducting coil provided in is used. Further, the outer field magnetic field canceling magnet 10 is provided in the vicinity of the peripheral wall portion 2014 of the vacuum vessel part 201, and the outer field magnetic field canceling magnet 11 is provided closer to the cylindrical part 2011 than the outer field magnetic field canceling magnet 10. ing.

  As is well known, the second cryostat unit 4 includes a vacuum container unit 401 made of non-magnetic metal, and helium (within the vacuum container unit 401 spaced apart from the wall of the vacuum container unit 401). He) a refrigerant container (not shown) such as a container, and a space between the refrigerant container (not shown) and the vacuum container part 401 and spaced from the refrigerant container (not shown) and the vacuum container part 401. It mainly comprises a heat shield (not shown) that blocks radiant heat from the vacuum vessel 401 to the refrigerant container (not shown). The second superconducting coil 3 such as a superconducting coil is built in the refrigerant container (not shown).

  The vacuum vessel portion 401 includes a nonmagnetic cylindrical portion 4011 that is coaxial with the center 6, disk-like nonmagnetic end wall portions 4012 and 4013 provided at both ends of the cylindrical portion 4011, and the cylindrical portion The peripheral wall portion 4014 surrounds the portion 4011 and extends between the peripheral surfaces of the both end wall portions 4012 and 4013.

  The end wall portion 4013 on the space 7 side has a bottom wall portion 401311 forming a circular recess 40131 whose center is coaxial with the center 6 of the spherical uniform static magnetic field space region 8 on the space 7 side. And a peripheral wall 401312 is provided. That is, in other words, the end wall portion 4013 on the space 7 side has a shape in which the vicinity of the outer peripheral portion protrudes toward the space 7 side, and the peripheral wall portions 4014 and 401312 connected to the protruding circular wall portion 4015 The circular wall portion 4015 forms a donut-shaped recess 4016 inside the vacuum vessel portion 401. In the donut-shaped recess 4016, the second superconducting coil 3 built in the refrigerant container (not shown) in the vacuum container 401 is disposed.

  In the second cryostat portion 4, an annular second adjusting magnet 92 is provided between the second superconducting coil 3 and the cylindrical portion 4011 so as to face the bottom wall portion 401311 of the circular recess 40131. It is arranged. In other words, the second adjustment magnet 92 surrounds the cylindrical portion 4011 and is surrounded by the second superconducting coil 3, and its center line is coaxial with the center line 6. As the second adjustment magnet 92, for example, a superconducting coil built in the refrigerant container (not shown) in the vacuum container 401 is used.

  In the second cryostat section 4, annular outer field magnetic field canceling magnets 12 and 13 that are coaxial with the coaxial 6 are provided. These outer field magnetic field canceling magnets 12 and 13 include a superconducting coil built in the refrigerant container (not shown) in the vacuum container 401 or the inside of the vacuum container 401 outside the refrigerant container (not shown). The non-superconducting coil provided in is used. Further, the outer field magnetic field canceling magnet 12 is provided in the vicinity of the peripheral wall portion 4014 of the vacuum vessel section 401, and the outer field magnetic field canceling magnet 13 is provided closer to the cylindrical portion 4011 than the outer field magnetic field canceling magnet 12. ing. In other words, the outer field magnetic field canceling magnet 13 surrounds the cylindrical portion 4011 and is surrounded by the outer field magnetic field canceling magnet 12.

  The connecting column portion 5 includes a nonmagnetic support bone portion 501 and a nonmagnetic outer wall portion 502 containing the support bone portion 501, and is connected between the first and second superconducting coils 1 and 3. And the load of each part of the first and second cryostat parts 2 and 4.

  The supporting bone portion 501 is composed of a nonmagnetic front strut portion 5011, a nonmagnetic rear strut portion 5012, and nonmagnetic end strut portions 5013 and 5014. The front column 5011, the rear column 5012, and the end columns 5013 and 5014 are integrated by welding or the like. Further, the support bone portion 501 and the outer wall portion 502 are integrated by welding or the like.

  The outer wall 502 includes a nonmagnetic front wall 5021, a nonmagnetic rear wall 5022, nonmagnetic end walls 5023 and 5024, a nonmagnetic upper wall 5025, and a nonmagnetic bottom wall. It consists of 5026. Further, the front wall portion 5021, the rear wall portion 5022, the end wall portions 5023 and 5024, the upper wall portion 5025, and the bottom wall portion 5026 are integrated by welding or the like. Furthermore, the outer wall portion 502 and the supporting bone portion 501 are integrated by welding or the like to form one structure. It is also possible to connect a plurality of connecting pillar portions 5 which are one structure in the circumferential direction of the first and second cryostat portions 2 and 4 so that the plurality of connecting pillar portions serve as one structure. Good. That is, the connecting column portion 5 may be substantially one structure. In this way, when the connecting column part 5 is substantially one structure, the magnetic resonance image is compared with the case where two connecting column parts spaced apart from each other as described in Patent Document 1 are provided. -The freedom degree of arrangement | positioning of the said magnetic resonance imaging apparatus in the room which installs a zing apparatus improves.

  The connecting column portion 5 has a vacuum container whose inside wall 502 is a vacuum, and incorporates a refrigerant communication pipe 18 and a wire insertion pipe 181 (see FIG. 3), which will be described later, and the outer wall section 502. A heat shield 503 (see FIG. 3) for blocking radiant heat from the refrigerant to the refrigerant communication pipe 18 is also incorporated. The upper wall portion 5025 of the connecting column portion 5 is provided with a refrigerator 14 and a non-magnetic refrigerant inlet 15.

  The refrigeration machine 14 is powered by an electric motor and is located above or outside the upper wall portion 5025, and cools the refrigerant in the refrigerant container (not shown) in the vacuum vessel portion 201 to cool the refrigerant. While returning to the inside of the container (not shown) through the communication path 16, the heat shield (not shown) in the vacuum container part 201 is supplied to the temperature of the vacuum container part 201 and the refrigerant container (not shown). It is provided for cooling to a temperature intermediate to the temperature. The refrigerator 14 is disposed at a position higher than the liquid level 20171 of the liquid refrigerant 2017 in the refrigerant container (not shown). Therefore, when the refrigerant in the refrigerant container (not shown) is liquefied helium (He), that is, the first superconducting coil 1 and the second superconducting coil 3 in the refrigerant container (not shown) are liquefied helium ( In the case of a superconducting coil cooled to a cryogenic temperature by He), the refrigerator 14 is liquefied by cooling helium (He) gas in the refrigerant container (not shown) in the vacuum container part 201. Helium (He) enters the communication path 16 by its own weight, and liquefied helium that has entered the communication path 16 returns to the refrigerant container (not shown) by its own weight. The refrigerator 14 has a weight of about 20 kg, and is removed from the upper wall portion 5025 during regular maintenance and inspection.

  The refrigerant inlet 15 is located above or outside the upper wall 5025 and is provided to inject into the refrigerant container (not shown) in the vacuum vessel 201 via the communication passage 17. Yes. When the liquid refrigerant in the refrigerant container (not shown) is liquefied helium (He), that is, when the first superconducting coil 1 and the second superconducting coil 3 in the refrigerant container (not shown) are superconducting coils. Then, liquefied helium (He) is injected from the refrigerant inlet 15 into the refrigerant container (not shown) in the vacuum container 201. The refrigerant inlet 15 is also used when extracting refrigerant gas from the refrigerant container (not shown) in the vacuum container 201.

  The refrigerant container (not shown) in the vacuum vessel part 201 of the first cryostat part 2 and the refrigerant container (not shown) in the vacuum container part 401 of the second cryostat part 4 are in communication with the refrigerant. The liquid refrigerant in the refrigerant container (not shown) of the first cryostat section 2 is communicated via the pipe 18 and into the refrigerant container (not shown) of the second cryostat section 4. 18 is supplied. When the refrigerant is liquefied helium (He), the liquid refrigerant is caused by its own weight from the refrigerant container (not shown) of the first cryostat unit 2 to the refrigerant container (of the second cryostat unit 4). Enter (not shown).

  A disc-shaped shim mounting member 191 is mounted on the bottom wall portion 201311 of the circular recess 20131 of the first cryostat portion 2 on the surface of the spherical uniform static magnetic field space region 8 side. The disk-shaped shim mounting member 191 is disposed coaxially with the center 6 of the spherical uniform static magnetic field space region 8. In addition, a large number of shim mounting holes 1911 (see FIG. 3) are provided on the surface of the shim mounting member 191 on the side of the uniform static magnetic field space region 8, and a necessary one of the many shim mounting holes 1911 is required. A shim (hereinafter referred to as “first shim”) 19111 made of a magnetic piece is detachably screwed into the shim mounting hole at the position.

  The inner surface (surface on the spherical uniform static magnetic field space region 8 side) of the peripheral wall portion 201312 in the circular recess 20131 extends in the direction of the center line 6 of the peripheral wall portion 201312 (that is, the center of the peripheral wall portion 201312). A large number of shims (hereinafter referred to as “second shims”) 202 extending in parallel with the line 6 can be attached to and detached from the peripheral wall portion 201312 at necessary intervals over the entire circumference of the peripheral wall portion 201312. Is attached.

  A disk-shaped shim mounting member 192 is attached to the bottom wall portion 401311 of the circular recess 40131 of the second cryostat portion 4 on the surface of the spherical uniform static magnetic field space region 8 side. The disk-shaped shim mounting member 192 is disposed coaxially with the center 6 of the spherical uniform static magnetic field space region 8. Further, the shim mounting member 192 has a number of shim mounting holes (not shown) on the surface of the uniform static magnetic field space region 8 side, similarly to the shim mounting member 191 on the first cryostat portion 2 side. As in the shim 19111 on the first cryostat portion 2 side, a shim made of a magnetic piece (hereinafter referred to as “the shim 19111”) is provided in a shim mounting hole at a required position among the plurality of shim mounting holes. (Referred to as “third shim”) (not shown) is detachably screwed.

  Extending in the direction of the center line 6 of the peripheral wall portion 401312 (that is, the center of the peripheral wall portion 401312) on the inner peripheral surface of the peripheral wall portion 401312 (the surface on the spherical uniform static magnetic field space region 8 side) A large number of shims (hereinafter referred to as “fourth shims”) 203 extending in parallel with the line 6 can be attached to and detached from the peripheral wall portion 401312 at necessary intervals over the entire circumference of the peripheral wall portion 401312. Is attached.

  In the circular recess 20131 of the first cryostat portion 2, the first gradient magnetic field coil 211 is connected to the shim mounting member 191, the first shim 19111, and the second shim 202 via a predetermined gap g. Is provided. This first gradient magnetic field coil 211 is generally configured by integrating an X-axis gradient magnetic field coil, a Y-axis gradient magnetic field coil, and a Z-axis gradient magnetic field coil with an insulating material, and is adjacent to the bottom wall 201311. The heat shield (not shown) has a shield coil on the bottom wall 201311 side for suppressing an eddy current generated by a magnetic field generated by the X-axis gradient magnetic field coil, the Y-axis gradient magnetic field coil, and the Z-axis gradient magnetic field coil. Sometimes it is.

  The predetermined gap g means that the first gradient magnetic field coil 211 is caused by vibration of the first gradient magnetic field coil 211 that is generated when a pulse current of several hundred amperes is supplied to the first gradient magnetic field coil 211. The gradient magnetic field coil 211 is a gap secured so as not to contact each member such as the shim mounting member 191, the first shim 19111, and the second shim 202 on the first cryostat portion 2 side. .

  Although not shown, the first gradient magnetic field coil 211 includes a support member that is not in contact with the first cryostat unit 2, the second cryostat unit 4, and the connecting column unit 5. It is attached on the installation floor 22 like the 2nd cryostat part 4 and the said connection pillar part 5, or is attached to the said connection pillar part 5 via a vibration absorption mechanism or a vibration absorption member.

  A first high-frequency coil (also referred to as an RF coil) 231 is disposed on the side of the uniform static magnetic field space region 8 of the first gradient magnetic field coil 211 so as to correspond to the uniform static magnetic field space region 8. .

  The circular recess 40131 of the second cryostat portion 4 has a second inclination through the shim mounting member 192, the third shim (not shown), and the fourth shim 203 with a predetermined gap g. A magnetic field coil 212 is provided. The second gradient magnetic field coil 212 is generally configured by integrating an X-axis gradient magnetic field coil, a Y-axis gradient magnetic field coil, and a Z-axis gradient magnetic field coil with an insulating material, and is adjacent to the bottom wall portion 401311. The thermal shield (not shown) has a shield coil on the bottom wall portion 401311 side for suppressing eddy current generated by the magnetic field generated by the X-axis gradient magnetic field coil, the Y-axis gradient magnetic field coil, and the Z-axis gradient magnetic field coil. Sometimes it is.

  The predetermined gap g means that the second gradient magnetic field coil 212 is caused by vibration of the second gradient magnetic field coil 212 that is generated when a pulse current of several hundred amperes is supplied to the second gradient magnetic field coil 212. The gradient magnetic field coil 212 is ensured not to contact each member such as the shim mounting member 192, the third shim (not shown), the fourth shim 203, etc. on the second cryostat section 4 side. It is a void.

  Although not shown, the second gradient magnetic field coil 212 is formed of a support that is not in contact with the first cryostat unit 2, the second cryostat unit 4, and the connecting column unit 5, and It is attached on the installation floor 22 like the 2nd cryostat part 4 and the said connection pillar part 5, or is attached to the said connection pillar part 5 via a vibration absorption mechanism or a vibration absorption member.

  A second high frequency coil (also referred to as an RF coil) 232 is disposed on the second gradient magnetic field coil 212 on the side of the uniform static magnetic field space region 8 so as to correspond to the uniform static magnetic field space region 8. .

  Next, the functions of the magnets and coils and the relative functions of the magnets, coils, and shims will be described.

  The first superconducting coil 1 on the first cryostat unit 2 side and the second superconducting coil 3 on the second cryostat unit 4 side are both in the spherical uniform static magnetic field space region 8 and the vicinity thereof. A uniform static magnetic field is generated from the first cryostat unit 2 toward the second cryostat unit 4 as shown by the arrows in the figure.

  The first adjustment magnet 9 on the first cryostat portion 2 side, the second adjustment magnet 10 on the second cryostat portion 4 side, and the shim attachment member 191 on the first cryostat portion 2 side are attached. A first shim 19111 (see FIG. 1), a third shim (not shown) attached to the shim mounting member 192 on the second cryostat portion 4 side, and the first shim 19111 on the first cryostat portion 2 side. The second shim 202 and the fourth shim 203 on the second cryostat section 4 side thereby cause the first superconducting coil 1 and the second superconducting coil in the spherical uniform static magnetic field space region 8 to be the same. 3 to increase the uniformity of the uniform static magnetic field up to several ppm of the allowable error.

  The outer field magnetic field canceling magnets 10 and 11 on the first cryostat section 2 side and the outer field magnetic field canceling magnets 12 and 13 on the second cryostat section 4 side are arranged above the connecting column section 5 (the refrigerator 14). Of the first superconducting coil 1 and the second superconducting coil 3 on the side farther than the spherical uniform static magnetic field space region 8 and on each part A, B, C, D of the connecting column part 5. Magnetic field in the direction to cancel the outer field magnetic field (the magnetic field indicated by the dotted arrow 131O in FIG. 2) (the magnetic field indicated by the one-dot chain line 1113 in the opposite direction to the dotted arrow in FIG. 2 (the magnetic field in the direction opposite to the outer magnetic field)) ) And the external magnetic field of the first superconducting coil 1 and the second superconducting coil 3 in the respective parts A, B, C, D of the connecting column part 5 (the magnetic field indicated by the dotted arrows in FIG. 2) ) The strength of the refrigerator 1 It is intended to suppress to the strength to the not to cause property deterioration and reduced life of the motor or reduce of.

  In addition, each part A, B, C, D of the said connection pillar part 5 is on the projection surface which looked at the said connection pillar part 5 in the said extension direction (the direction of arrow C), ie, the said of the said connection pillar part 5. It exists on the projection surface in the extending direction.

  In addition, since the outer field magnetic field canceling magnets 10 to 13 are provided, the strength of the magnetic field by the first superconducting coil 1 and the second superconducting coil 3 in the spherical uniform static magnetic field space region 8 is slightly reduced. The intensity of the magnetic field applied to the first superconducting coil 1 and the second superconducting coil 3 is larger than that in the case where the outer field magnetic field canceling magnets 10 to 13 are not provided. The strength of the magnetic field is set to a predetermined strength.

  Further, in the connecting column part 5, both the supporting bone part 501 and the outer wall part 502 are non-magnetic. However, when at least one of the supporting bone part 501 and the outer wall part 502 is made magnetic, the magnetic property is reduced. Since the magnetic field generated by the first superconducting coil 1 and the second superconducting coil 3 is concentrated on at least one of the supporting bone part 501 and the outer wall part 502, the so-called connecting columns such as the parts A, B, C, D, etc. In this case, the magnetic field canceling magnet that generates a magnetic field in a direction that cancels the external magnetic field of the first and second superconducting coils 1 and 3 is strong. The generated magnetic fields of 10, 11, 12, and 13 need to be increased as compared to the case where both the supporting bone portion 501 and the outer wall portion 502 are nonmagnetic, and accordingly, the first superconducting coil 1 and Previous The strength of the magnetic field of the second superconducting coil 3 above with the more strongly strength of the magnetic field due to the spherical homogeneous static magnetic field space region 8 has to be a predetermined intensity.

  Note that energization of the coils 3, 12, 13, 92 in the second cryostat section 4 is performed by the electric wires in the wire insertion pipe 181 (see FIG. 3) built in the connecting column section 5. (Not shown).

  Next, the detailed structure and effects of the main part of the first embodiment of the present invention will be described with reference to FIG.

  That is, in FIG. 3, the structural feature of Embodiment 1 of the present invention is that all of the following 1-3 are provided.

1. A portion corresponding to the uniform static magnetic field space region 8 (see FIG. 2) of the connecting column portion 5 (that is, between the first cryostat portion 2 and the second cryostat portion 4 of the connecting column portion 5). The shape of the connecting column part 5 when the connecting column part 5 in the portion) is viewed in the extending direction is substantially rectangular as shown in FIG. That is, the shape is a substantially rectangular shape having a front wall portion 5021, a rear wall portion 5022, and end wall portions 5023, 5024.

2. The connecting column 5 extends in the radial direction of the superconducting coils 1 and 3 across the inside and outside of the first and second cryostats 2 and 4 as shown in the figure.

3. As shown in the drawing, the width of the connecting column 5 in the circumferential direction of the superconducting coils 1 and 3 is set on the side W2 farther from the uniform static magnetic field space region than the front side W1 facing the uniform static magnetic field space region. The first and second cryostats 2 and 4 in the radial direction of the coils 1 and 3 are widened. Specifically, an inclined portion 50271 is provided between the front wall portion 5021 and the end wall portion 5023, and an inclined portion 50281 is provided between the front wall portion 5021 and the end wall portion 5024. In other words, the inclined portion 50271 is between the curved portion 50272 at the boundary between the inclined portion 50271 and the end wall portion 5023, and the curved portion 50273 at the boundary between the inclined portion 50271 and the front wall portion 5021. The superconducting coils 1 and 3 extend linearly in the radial direction, and similarly, the curved portion 50282 at the boundary between the inclined portion 50281 and the end wall portion 5024, the inclined portion 50281, and the front wall portion 5021. The inclined portion 50281 extends linearly in the radial direction of the superconducting coils 1 and 3 between the curved portion 50283 and the curved portion 50283. The curved portion 50272 at the boundary between the inclined portion 50271 and the end wall portion 5023 and the curved portion 50282 at the boundary between the inclined portion 50281 and the end wall portion 5024 are the first and second cryostats 2. , 4 (only the second cryostat 4 is shown in FIG. 3). In other words, the curved portion 50272 at the boundary between the inclined portion 50271 and the end wall portion 5023 and the boundary between the inclined portion 50281 and the end wall portion 5024 when the connecting column portion 5 is viewed in the extending direction. As shown in FIG. 3, the position of the curved portion 50282 is located inside the outer peripheral surface of the first and second cryostats 2 and 4 (only the second cryostat 4 is shown in FIG. 3). It is closer to the center 6 from the outer peripheral surface.

  In addition, the shape which looked at the said connection pillar part 5 in the said extension direction in the part corresponding to the said uniform static magnetic field space area | region 8 (refer FIG. 2) of the said connection pillar part 5 provides the said inclination parts 50271 and 50281. Strictly speaking, it becomes a hexagon, but when the inclined portion is provided at the corner on the side of the uniform static magnetic field space region 8 of the rectangular connecting pillar portion, the inclined portion becomes a hexagonal shape or a substantially trapezoidal shape. As shown in FIG. 3, the curved portions 50272, 50282 at the boundary between the 50271, 50281 and the end wall portions 5023, 5024 are inside the outer peripheral surfaces of the first and second cryostats 2, 4 as shown in FIG. When it is located closer to the center 6 from the outer peripheral surface, it falls within the category of “substantially rectangular” in the present invention.

  Next, the effects of the structural features of the first embodiment of the present invention will be described.

  Effect 1 of the structural features of the first embodiment of the present invention described above

  In FIG. 3, the connecting column 5 extends in the radial direction of the superconducting coils 1, 3 as shown in the figure, straddling the inside and outside of the first and second cryostat units 2, 4. In a portion corresponding to the uniform static magnetic field space region 8 (see FIG. 2) of the portion 5 (that is, a portion of the connecting column portion 5 between the first cryostat portion 2 and the second cryostat portion 4). When the shape of the connecting column portion 5 when the connecting column portion 5 is viewed in the extending direction is a regular quadrilateral as shown by a one-dot chain line in FIG. 3 without providing the inclined portions 50271 and 50281. As shown in FIG. 3, the hatched area D of the alternate long and short dash line in the space 7 (see also FIG. 2) between the first cryostat portion 2 and the second cryostat portion 4 is occupied by the regular quadrilateral. Is done.

  On the other hand, as in the above-described first embodiment of the present invention indicated by a solid line in FIG. 3, the portion corresponding to the uniform static magnetic field space region 8 (see FIG. 2) of the connecting column portion 5 (that is, the connecting column). The shape of the connecting column portion 5 when the connecting column portion 5 is viewed in the extending direction of the connecting column portion 5 in the portion 5 between the first cryostat portion 2 and the second cryostat portion 4 is substantially rectangular. As shown in the drawing, the connecting column portion 5 extends in the radial direction of the superconducting coils 1 and 3 across the inside and outside of the first and second cryostat portions 2 and 4, and the connecting column portion 5 The circumferential width of the superconducting coils 1 and 3 is set so that the diameter of the superconducting coils 1 and 3 is larger on the side W2 farther from the uniform static magnetic field space region than the front side W1 facing the uniform static magnetic field space region 8 as shown. In the first and second cryostats 2, 4 in the direction If the inclined portions 50271 and 50281 are provided, the hatched area d of the alternate long and short dash line becomes a space (hereinafter referred to as “enlarged space d”), and the first cryostat portion 2 and the first The space 7 in the second cryostat section 4 is widened by the expansion space d. Therefore, the openness to the subject is improved, and the diagnostic staff can easily access the subject at the time of diagnosis.

  Effect 2 due to the structural features of the first embodiment of the present invention described above

  A portion corresponding to the uniform static magnetic field space region 8 (see FIG. 2) of the connecting column portion 5 (that is, between the first cryostat portion 2 and the second cryostat portion 4 of the connecting column portion 5). In order to secure the above-mentioned “enlarged space d”, the shape of the connecting column portion 5 when the connecting column portion 5 in the portion is viewed in the extending direction is, for example, shown by a one-dot chain line in FIG. In the case of a regular quadrilateral having an angle ABCD, the above-mentioned “expanded space d” can be ensured, but the load caused by the mutual attractive force between the first and second superconducting coils 1 and 3 and the first and second The area that receives the load that the so-called connecting column part 5 should receive, such as the load of each part of the second cryostat parts 2, 4 (hereinafter referred to as “effective area for load”) is the area ABCD surrounded by the ABCD. .

  On the other hand, the effective load area in the case of the above-described first embodiment of the present invention indicated by the solid line in FIG. 3 is the area AEFGH surrounded by the angle AFEGH, and the effective load area in the case of the regular quadrilateral. Obviously wider than ABCD. Further, since the effective area for load is large, the effective area for load of the supporting bone portion 501 can be increased. Therefore, in comparison with the regular quadrilateral ABCD for securing the “expanded space d”, the first embodiment of the present invention can stably and accurately receive the load applied to the connecting column portion 5. That is, it becomes easy to receive the load applied to the connecting column portion 5.

  Effect 3 due to the structural features of the first embodiment of the present invention described above

  A portion corresponding to the uniform static magnetic field space region 8 (see FIG. 2) of the connecting column portion 5 (that is, between the first cryostat portion 2 and the second cryostat portion 4 of the connecting column portion 5). When the shape of the connecting column part 5 when the connecting column part 5 is viewed in the extending direction in the portion is, for example, a cylindrical shape as in the above-mentioned Patent Document 1 and Patent Document 2 (one point in FIG. 5) The effective area against load is smaller than the effective area AEFGH in the first embodiment of the present invention, and the load against the cryostats 2 and 4 The effective area is also reduced, and it is difficult to stably and accurately receive the load applied to the connecting column portion 5. In order to make the effective area for load in the cryostats 2 and 4 equal to the effective area for load ABEFGH in the first embodiment of the present invention, a circle indicated by a two-dot chain line in FIG. In this way, the cylinder must have a very large diameter, and the openness to the above-mentioned subject and the person concerned with diagnosis is lowered.

  On the other hand, in the case of the above-described first embodiment of the present invention indicated by a solid line in FIG. 3, the portion corresponding to the uniform static magnetic field space region 8 (see also FIG. The shape of the connecting column portion 5 when the connecting column portion 5 is viewed in the extending direction in the connecting column portion 5 (the portion between the first cryostat portion 2 and the second cryostat portion 4) is described above. As compared with the case of the columnar shape as described above, it becomes easier to receive the load applied to the connecting column portion 5.

  Effect 4 due to the structural features of the first embodiment of the present invention described above

  In the case where the shape of the connecting column portion 5 is a columnar shape, the effective area for the load in the cryostats 2 and 4 is the same as the pair in the cryostats 2 and 4 in the first embodiment of the present invention described above. In order to make it equal to the effective load area, as shown by the alternate long and short dash line in FIG. 6, when the column-shaped connecting column portion 5 is disposed closer to the uniform static magnetic field space region 8 (see also FIG. 2). Is that the uniform static magnetic field space region 8 side of the columnar connecting column part 5 protrudes greatly to the uniform static magnetic field space region 8 side, and the protruding portions are the first and second cryostat portions 2. , 4 occupies a large space 7 and remarkably lowers the openness to the above-mentioned subjects and persons concerned with diagnosis.

  On the other hand, in the case of the above-described first embodiment of the present invention indicated by a solid line in FIG. 3, the columnar connecting column portion 5 is disposed closer to the uniform static magnetic field space region 8 (FIG. 5). Compared to the circle of the two-dot chain line), the above openness for the above-mentioned subject and the person concerned with diagnosis is much better.

Embodiment 2. FIG.
Hereinafter, the second embodiment of the present invention will be described mainly with reference to FIG. 7 with respect to differences from the above-described first embodiment of the present invention, and other descriptions will be omitted. FIG. 7 shows a portion corresponding to the uniform static magnetic field space region 8 (see FIG. 2) of the connecting column portion 5 (that is, the first cryostat portion 2 and the second cryostat portion 4 of the connecting column portion 5). It is a cross-sectional top view which shows the other example of the said connection pillar part 5 which looked at the said connection pillar part 5 in the said extension direction in the part between). In FIG. 7, the same or corresponding parts as those in FIGS.

  As shown in FIG. 7, the second embodiment of the present invention corresponds to the inclined portions 50271 and 50281 of the outer wall portion 502 of the connecting column portion 5, and the circumferential direction of the superconducting coils 1 and 3 of the supporting bone portion 501. Of the first and second cryostats 2 in the radial direction of the superconducting coils 1 and 3 on the side W4 farther from the uniform static magnetic field space region 8 than the front side W3 on the uniform static magnetic field space region 8 side. , 4 parts widened. In other words, inclined portions 50151 and 50161 are provided corresponding to the inclined portions 50271 and 50281 of the outer wall portion 502 of the connecting column portion 5.

  According to the second embodiment of the present invention, by configuring as described above, the circumferential width of the superconducting coils 1 and 3 of the supporting bone portion 501 is the first and second cryostats 2 and 4. Since the width W4 extends from the inside to the outside of the first and second cryostats 2 and 4 as compared with the width W3 in the first embodiment of the present invention described above, As compared with the first embodiment of the present invention described above, the load applied to the connecting column portion 5 can be more stably and accurately received, that is, the connecting column portion 5 This load is more easily received.

Embodiment 3 FIG.
Hereinafter, the third embodiment of the present invention will be described mainly with reference to FIG. 8 with respect to differences from the first embodiment and the first embodiment of the present invention described above, and the other description will be omitted. FIG. 8 shows a portion corresponding to the uniform static magnetic field space region 8 (see FIG. 2) of the connecting column portion 5 (that is, the first cryostat portion 2 and the second cryostat portion 4 of the connecting column portion 5). It is a cross-sectional top view which shows the other example of the said connection pillar part 5 which looked at the said connection pillar part 5 in the said extension direction in the part between). In FIG. 8, the same or corresponding parts as those in FIGS.

  In the third embodiment of the present invention, as shown in FIG. 8, a wall surface 50211 facing the uniform static magnetic field space region 8 in the front wall portion 5021 of the outer wall portion 502 of the connecting column portion 5 is The front wall portion 5021 is curved toward the inner side of the connecting column portion 5 so as to be bent toward the inner side of the portion 5. In other words, the wall surface 50211 is curved in a direction away from the center 6 of the uniform static magnetic field space region 8.

  According to the third embodiment of the present invention, the uniform static magnetic field space of the wall surface 50211 facing the uniform static magnetic field space region 8 in the front wall portion 5021 of the connecting column portion 5 is configured as described above. An enlarged space E is formed on the region 8 side, and the space 7 between the first cryostat portion 2 and the second cryostat portion 4 is compared with the first and second embodiments of the present invention described above. As a result, it becomes wider by the enlarged space e. Therefore, the openness to the subject is further improved as compared with the first and second embodiments of the present invention described above.

Embodiment 4 FIG.
Hereinafter, the fourth embodiment of the present invention will be described mainly with reference to FIG. 9 with respect to differences from the first to third embodiments of the present invention described above, and the other description will be omitted. 9 shows a portion of the connecting column portion 5 corresponding to the uniform static magnetic field space region 8 (see FIG. 2) (that is, the first cryostat portion 2 and the second cryostat portion 4 of the connecting column portion 5). It is a cross-sectional top view which shows the other example of the said connection pillar part 5 which looked at the said connection pillar part 5 in the said extension direction in the part between). In FIG. 9, the same or corresponding parts as those in FIGS.

  In the fourth embodiment of the present invention, as shown in FIG. 9, the front column part 5011 of the support bone part 501 of the connecting column part 5 is curved toward the inside of the connecting column part 5. As a result, the front wall portion 5021 of the outer wall portion 502 of the connecting column portion 5 is deeply curved toward the inside of the connecting column portion 5 as compared with the third embodiment of the present invention described above. As a result, the wall surface 50211 facing the uniform static magnetic field space region 8 in the front wall portion 5021 of the outer wall portion 502 is the center 6 of the uniform static magnetic field space region 8 as compared with the third embodiment of the present invention described above. It is deeply curved in the direction away from. In other words, the connecting column portion 5 is composed of an outer wall portion 502 and a column portion 501 in the outer wall portion, and a portion of the column portion 501 corresponding to the inward bending of the wall surface 50211 is the curve. Curved to correspond to.

  According to the fourth embodiment of the present invention, the uniform static magnetic field space of the wall surface 50211 facing the uniform static magnetic field space region 8 in the front wall portion 5021 of the connecting column portion 5 is configured as described above. Compared to the third embodiment of the present invention described above, a wider enlarged space E is formed on the region 8 side, and the space 7 between the first cryostat section 2 and the second cryostat section 4 is formed as described above. Compared to Embodiment 3 of the present invention, it becomes wider. Therefore, the openness to the subject is further improved compared to the above-described third embodiment of the present invention.

Embodiment 5 FIG.
Hereinafter, the fifth embodiment of the present invention will be mainly described with respect to the differences from the first to fourth embodiments of the present invention described above with reference to FIG. 10, and the other description will be omitted. 10 shows a portion of the connecting column portion 5 corresponding to the uniform static magnetic field space region 8 (see FIG. 2) (that is, the first cryostat portion 2 and the second cryostat portion 4 of the connecting column portion 5). It is a cross-sectional top view which shows the other example of the said connection pillar part 5 which looked at the said connection pillar part 5 in the said extension direction in the part between). In FIG. 10, parts that are the same as or correspond to those in FIGS.

  As shown in FIG. 10, the fifth embodiment of the present invention has an inclined portion 50271 extending linearly of the outer wall portion 502 of the connecting column portion 5 in FIG. 9 of the aforementioned fourth embodiment of the present invention. 50281 and the inclined portions 50151 and 50161 extending linearly of the supporting bone portion 501, curved portions 50274 and 50284 curved toward the outside of the connecting column portion 5 are used as the outer wall of the connecting column portion 5. In the portion 502, curved portions 50152 and 50162 are formed on the supporting bone portion 501 of the connecting column portion 5, respectively. In other words, the end wall portions 5023 and 5024 on both sides between the front side of the connecting column portion 5 facing the uniform static magnetic field space region 8 and the wide portion far from the uniform static magnetic field space region 8 Curved to

  According to Embodiment 5 of the present invention, by configuring as described above, the surface areas of the curved portions 50274 and 50284 of the outer wall portion 502 are the same as those of Embodiments 1 to 4 of the present invention described above. Since it becomes small compared, the heat penetration | invasion to the inside of the said connection pillar part 5 from the outside of the said connection pillar part 5 which incorporated the communicating pipe | tube 18 through which a liquid refrigerant passes becomes smaller.

  In addition, by forming the curved portions 50152 and 50162 in the support bone portion 501, the curved portions 50274 and 50274 of the outer wall portion 502 are compared with the case where the curved portions 50152 and 50162 are not formed in the support bone portion 501. The curvature radius of 50284 becomes small, and the heat intrusion from the outside of the connecting column portion 5 to the inside of the connecting column portion 5 becomes smaller.

Embodiment 6 FIG.
Hereinafter, the sixth embodiment of the present invention will be mainly described with reference to FIG. 11 with respect to differences from the first to fifth embodiments of the present invention described above, and the other description will be omitted. FIG. 11 shows a portion corresponding to the uniform static magnetic field space region 8 (see FIG. 2) of the connecting column portion 5 (that is, the first cryostat portion 2 and the second cryostat portion 4 of the connecting column portion 5). It is a cross-sectional top view which shows the other example of the said connection pillar part 5 which looked at the said connection pillar part 5 in the said extension direction in the part between). In FIG. 11, parts that are the same as or correspond to those in FIGS.

  In Embodiment 6 of the present invention, as shown in FIG. 11, the wall surface 50211 of the front wall portion 5021 of the connecting column portion 5 in FIG. 9 of Embodiment 4 of the present invention described above is the first and first 2 coincides with the circumferential surface of the circular recesses 20131 and 40131 of the cryostat portions 2 and 4. In FIG. 11, only the circular recess 40131 of the second cryostat portion 4 is shown.

  According to the sixth embodiment of the present invention, the uniform static magnetic field space of the wall surface 50211 facing the uniform static magnetic field space region 8 in the front wall portion 5021 of the connecting column portion 5 is configured as described above. Compared to the above-described fourth embodiment of the present invention, a wider expanded space E is formed on the region 8 side, and the space 7 between the first cryostat portion 2 and the second cryostat portion 4 is formed as described above. Compared to the fifth embodiment of the present invention, it becomes wider. Therefore, the openness to the subject is further improved compared to the above-described fifth embodiment of the present invention.

Embodiment 7 FIG.
Hereinafter, the seventh embodiment of the present invention will be mainly described with respect to the differences from the first to sixth embodiments of the present invention described above with reference to FIGS. 12 and 13, and the other description will be omitted. FIG. 12 shows a portion corresponding to the uniform static magnetic field space region 8 (see FIG. 2) of the connecting column portion 5 (that is, the first cryostat portion 2 and the second cryostat portion 4 of the connecting column portion 5). FIG. 13 is an external side view of FIG. 12, showing another example of the connecting column part 5 when the connecting column part 5 is viewed in the extending direction. 12 and 13, the same or corresponding parts as those in FIGS. 1 to 11 are denoted by the same reference numerals.

  In the seventh embodiment of the present invention, as clearly shown in FIG. 13, the wall surface 50211 of the front wall portion 5021 of the connecting column portion 5 in FIG. Even if it sees, it curves to the inner side of the said connection pillar part 5. FIG. In other words, the wall surface 50211 of the front wall portion 5021 of the connecting column portion 5 in FIG. 11 of the above-described sixth embodiment of the present invention is further away from the uniform static magnetic field space region 8 even when viewed from the side. Is so curved.

  According to Embodiment 7 of the present invention, the uniform static magnetic field space of the wall surface 50211 facing the uniform static magnetic field space region 8 in the front wall portion 5021 of the connecting column portion 5 is configured as described above. Compared to the above-described sixth embodiment of the present invention, a wider expansion space E is formed on the region 8 side, and the space 7 between the first cryostat portion 2 and the second cryostat portion 4 is formed as described above. Compared to the sixth embodiment of the present invention, it becomes wider. Therefore, the openness to the subject is further improved compared to the above-described sixth embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows Embodiment 1 of this invention, and is a top view which shows an example of a structure of the principal part of the whole opposing magnetic resonance imaging apparatus. It is a figure which shows Embodiment 1 of this invention, and is the vertical side view which looked at the cross section in the II-II line | wire of FIG. 1 in the arrow direction. FIG. 3 is a diagram illustrating the first embodiment of the present invention, and is a cross-sectional plan view of the cross section taken along the line III-III in FIG. 2 as viewed in the direction of the arrows; FIG. It is a figure which shows Embodiment 1 of this invention, and is the effect of Embodiment 1 of this invention. It is a figure which shows Embodiment 1 of this invention, and is explanatory drawing of the effect of Embodiment 1 of this invention. It is a figure which shows Embodiment 1 of this invention, and is explanatory drawing of the effect of Embodiment 1 of this invention. It is a figure which shows Embodiment 2 of this invention, and shows the other example of the said connection pillar part which looked at the said connection pillar part in the part corresponding to the uniform static magnetic field space area | region of a connection pillar part in the said extension direction. FIG. It is a figure which shows Embodiment 3 of this invention, and shows the other example of the said connection pillar part which looked at the said connection pillar part in the part corresponding to the uniform static magnetic field space area | region of a connection pillar part in the said extension direction. FIG. It is a figure which shows Embodiment 4 of this invention, and shows the other example of the said connection pillar part which looked at the said connection pillar part in the part corresponding to the uniform static magnetic field space area | region of a connection pillar part in the said extension direction. FIG. It is a figure which shows Embodiment 5 of this invention, and shows the other example of the said connection pillar part which looked at the said connection pillar part in the part corresponding to the uniform static magnetic field space area | region of a connection pillar part in the said extension direction. FIG. It is a figure which shows Embodiment 6 of this invention, and shows the other example of the said connection pillar part which looked at the said connection pillar part in the part corresponding to the uniform static magnetic field space area | region of a connection pillar part in the said extension direction. FIG. It is a figure which shows Embodiment 7 of this invention, and shows the other example of the said connection pillar part which looked at the said connection pillar part in the part corresponding to the uniform static magnetic field space area | region of a connection pillar part in the said extension direction. FIG. It is a figure which shows Embodiment 7 of this invention, and is an external appearance side view of FIG.

Explanation of symbols

1 first superconducting coil,
2 First cryostat section,
201 vacuum vessel,
2011 Cylindrical part,
2012 end wall,
2013 end wall,
20131 circular dent,
201311 Bottom wall,
201312 Perimeter wall,
2014 end wall,
2015 round wall,
2016 donut shaped dent,
2017 Liquid refrigerant,
20171 Liquid refrigerant level,
3 Second superconducting coil,
4 Second cryostat section,
401 vacuum vessel,
4011 cylindrical part,
4012 end wall,
4013 end wall,
40131 circular dent,
401311 bottom wall,
401312 perimeter wall,
4014 perimeter wall,
4015 circular wall,
4016 donut shaped dent,
5 connecting pillars,
501 support bone,
5011 front strut,
5012 rear strut,
5013 end struts,
5014 end struts,
50151 inclined part,
50161 slope,
50152 curved part,
50162 curved part,
502 outer wall,
5021 Front wall,
50211 wall surface,
5022 rear wall,
5023 end wall,
5024 end wall,
5025 Upper wall,
5026 bottom wall,
50271 slope,
50272 songs,
50273 songs,
50274 curved part,
50281 inclined part,
50282 songs,
50283 songs,
50284 curved part,
503 heat shield,
6 Center (center line),
7 space,
71 Patient bed,
8 uniform static magnetic field space region,
91 first adjusting magnet,
92 second adjusting magnet,
10 outer field magnetic field canceling magnet,
11 Outer magnetic field canceling magnet,
12 outer field magnetic field canceling magnet,
13 Outer magnetic field canceling magnet,
14 refrigerator,
15 refrigerant inlet,
16 passages,
17 Communication path,
18 Refrigerant communication pipe,
181 Electric wire insertion tube,
191 shim mounting members,
1911 Shim mounting holes
19111 The first shim,
192 shim mounting members,
202 second shim,
203 4th shim,
211 a first gradient coil;
212 second gradient coil,
22 Installation floor,
231 a first high frequency coil;
232 second high frequency coil,
D Expansion space E Expansion space.

Claims (5)

  Annular superconducting coils in which the first and second cryostats each containing liquid refrigerant cooled by a refrigerator are built in the first and second cryostats between the first and second cryostats In the superconducting electromagnet apparatus including a connecting column portion that extends across and connects the first and second cryostat portions so that a space in which a uniform static magnetic field space region exists is formed, The shape of the portion corresponding to the uniform static magnetic field space region viewed in the extending direction is substantially rectangular, and the connecting column portion extends in the radial direction of the superconducting coil across the inside and outside of the first and second cryostat portions. And the width of the superconducting coil in the circumferential direction of the connecting pillar portion is farther from the uniform static magnetic field space region than the front side facing the uniform static magnetic field space region. Superconducting electromagnet apparatus, wherein a are widely within the first and second cryostat portion in the radial direction of the superconducting coil.   The superconducting electromagnet apparatus according to claim 1, wherein end walls on both sides between a front side of the connecting column portion facing the uniform static magnetic field space region and a wide portion far from the uniform static magnetic field space region are A superconducting electromagnet apparatus characterized by bending outward.   2. The superconducting electromagnet apparatus according to claim 1, wherein a wall surface facing the uniform static magnetic field space region of the connecting column portion is curved inward of the connecting column portion.   4. The superconducting electromagnet device according to claim 3, wherein the connecting column portion is composed of an outer wall portion and a support portion in the outer wall portion, and a portion of the support portion corresponding to the inward bending of the wall surface. A superconducting electromagnet apparatus that is curved corresponding to the curvature.   A magnetic resonance imaging apparatus comprising the superconducting electromagnet apparatus according to any one of claims 1 to 4.

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