WO2004002306A1 - 磁気共鳴イメージング装置 - Google Patents
磁気共鳴イメージング装置 Download PDFInfo
- Publication number
- WO2004002306A1 WO2004002306A1 PCT/JP2003/008282 JP0308282W WO2004002306A1 WO 2004002306 A1 WO2004002306 A1 WO 2004002306A1 JP 0308282 W JP0308282 W JP 0308282W WO 2004002306 A1 WO2004002306 A1 WO 2004002306A1
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- WO
- WIPO (PCT)
- Prior art keywords
- bed
- pair
- magnet
- cross
- magnets
- Prior art date
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
- G01R33/3806—Open magnet assemblies for improved access to the sample, e.g. C-type or U-type magnets
Definitions
- the present invention relates to a magnetic resonance imaging apparatus of a vertical magnetic field type in which a pair of magnets are vertically arranged opposite to each other, and more particularly to a configuration of a support and a bed for facilitating access to a subject.
- a vertical magnetic field type magnetic resonance imaging (hereinafter referred to as “MRI”) system consists of a pair of magnets, which are arranged vertically opposite each other with a measurement space for inserting a subject in between (vertical) and form a static magnetic field.
- a gantry consisting of a support provided on the upper and lower magnets and holding the upper magnet, and a couchtop that supports the top and a couchtop that places the subject and enters the measurement space between the magnets (Hereinafter, referred to as “bed”).
- interventional MR which takes an image of a subject (that is, a patient) and performs invasive treatment such as surgery while monitoring the image
- interventional MR it is necessary for the operator (that is, doctor) to access the subject and to clean the subject, especially on the side of the subject's body axis and the side where the couch is inserted. That is, when the subject is introduced from the head side, it is necessary to access the feet of the subject from both sides of the subject.
- interventional MR it is important for the surgeon to be able to access the subject from both sides, since multiple operators, such as doctors and assistants, need to access the subject from various directions.
- imaging of MR images is mainly performed mainly at the center of the magnet where the static magnetic field is most stable, it is particularly important that access to the imaging region of the subject located at the center of the magnet is smooth. Furthermore, in order to reduce the burden on the subject, it is necessary to make the subject feel open and open, in other words, to make the gantry open. Necessary both.
- Japanese Patent Application Laid-Open No. 2001-198099 proposes an example of an MI device in which the accessibility and openness as described above are improved in such a column structure.
- the direction of the straight line connecting the struts and the longitudinal direction of the bed are arranged at an angle of 45 °.
- An object of the present invention is to make it easy to access a subject from various directions in a vertical magnetic field type MRI apparatus in which two columns are arranged symmetrically with respect to the center of a magnet.
- a magnetic resonance imaging apparatus of the present invention is configured as follows.
- a magnetic resonance imaging apparatus having a gantry comprising a pair of columns supported to support the upper magnet and a bed provided with a top plate for placing the subject in the measurement space.
- the pair of columns are disposed to face each other with the central axis of the upper magnet and the lower magnet interposed therebetween, and one of the columns has a smaller sectional area than the other column. .
- a straight line connecting the centers of the pair of columns is provided.
- the cross-sectional area in the orthogonal direction is small.
- the width of the column is 1Z2 or less of the width of the other column in the same direction.
- the column having a reduced cross-sectional area becomes thinner and the openness is further increased, so that access to the subject from that direction is further facilitated.
- one or both of the pair of struts have an outwardly curved shape.
- a center of the pair of magnets is arranged from a side of the column having the smaller cross-sectional area with respect to a straight line that intersects a straight line connecting the centers of the pair of pillars and passes through the centers of the pair of magnets.
- the bed is arranged such that the top plate is inserted toward the bed.
- the column side having a large cross-sectional area has a sufficiently large free space, so that it is easy to access the subject from that direction.
- the access to the test object from the side of the column with a small cross section is easy because the cross section of the column is small. That is, since the access from both sides of the subject is facilitated, particularly, the foot side of the subject when the subject is inserted from the head side can be accessed from both sides.
- an angle between a linear direction that is orthogonal to a straight line connecting the centers of the pair of columns and passes through the centers of the pair of magnets and an insertion direction of the top plate is 15 ° or more. 45 °, preferably 25 ° to 35 °.
- the bed is arranged such that the top plate is inserted toward a center of the pair of magnets from a position close to the column having the large cross-sectional area.
- the surgeon places the support with a small cross-sectional area therebetween, so that the accessible area to the subject is maximized, and the subject can be moved from any direction. Will also be easily accessible.
- the gantry is movable along the outer edge.
- a bed fixing part which is connected to a connecting part of the bed to determine a position where the bed is arranged, and fixes the bed so that the top plate is inserted toward the center of the pair of magnets.
- the connecting part of the bed is connected to the bed fixing part, and the bed is fixed. .
- the column having a small cross-sectional area has a substantially rectangular cross section, and has a shape such that a long side direction of the cross section is a radial direction of the magnet.
- a side face of the column having a large cross-sectional area facing the center of the magnet is formed in a tapered shape with a taper.
- FIG. 1 is a perspective view showing the configuration of the upper and lower magnets and the gantry of the first embodiment of the MRI apparatus to which the present invention is applied.
- FIG. 2 is a plan view of the MRI apparatus of FIG. 1, in which the top plate is inserted from a column having a small cross-sectional area.
- FIG. 3 is an elevation view of the MRI apparatus of FIG. 1 as viewed from a side orthogonal to the longitudinal direction of the bed.
- FIG. 4 is a plan view showing a state when the MRI apparatus of FIG. 1 is used.
- FIG. 5 is a plan view of a second embodiment of the MRI apparatus to which the present invention is applied.
- FIG. 6 is a plan view of a third embodiment of the MRI apparatus to which the present invention is applied, in which a top plate is inserted from a column having a large cross-sectional area.
- FIG. 7 is a plan view of a fourth embodiment of the MRI apparatus to which the present invention is applied, in which a support column has a shape curved outward.
- FIGS. 8A and 8B are diagrams showing simulation results relating to the insertion angle of the top plate, wherein FIG. 8A shows a portion to be simulated, and FIG. 8B is a graph showing the simulation results.
- FIG. 1 is a perspective view showing the configuration of the upper and lower magnets and the gantry of the MRI apparatus of the present embodiment.
- FIG. 2 is a plan view of an MRI apparatus using the gantry of FIG.
- the gantry of the MM device according to the present embodiment has a disk-shaped upper magnet 1, a lower magnet 3, and an upper magnet 1, which are vertically separated and opposed to each other. It is composed of a column 5 that couples the side magnet 3 and holds the upper magnet 1, and a column 7.
- This gantry has a substantially rectangular plane shape as shown in Fig. 2, and holds the top plate 11 inserted into the measurement space between the upper and lower magnets along the longitudinal direction, and the top plate 11
- a bed 9 including a bed base 10 is provided.
- the upper magnet 1 has an upper portion having a cylindrical side surface, and a lower portion formed in a truncated conical shape having a continuously tapering downward from the upper portion.
- the lower surface of the lower portion of the truncated cone that is, the surface facing the lower magnet 3, is formed in a circular plane.
- the intersection between the plane and the tapered surface of the lower side surface is chamfered and rounded.
- the lower magnet 3 has a vertically symmetric shape with the upper magnet 1.
- the outer diameters of the upper magnet 1 and the lower magnet 3 are, for example, 2200 mm.
- the struts 5 and the struts 7 are arranged on the outer edges of the upper magnet 1 and the lower magnet 3 with the central axis of the upper and lower magnets interposed therebetween. That is, the support 5 and the support 7 have their centers located 180 ° apart on the outer periphery of the upper magnet 1 and the lower magnet 3.
- the struts 5 and the struts 7 have cross-sectional shapes that are line-symmetric with respect to a straight line connecting the centers of their cross sections, respectively.
- the support 5 has a larger cross-sectional area than the support 7.
- the cross-sectional shape of the pillar 5 is such that one long side of the rectangle is tapered and the vertex is rounded, and the vertex of the protruding side is arranged toward the center of the magnet .
- the strut 7 has a substantially rectangular cross section, and is arranged so that its long side extends in the direction of the strut 5 (that is, in the radial direction of each magnet). The four corners are rounded and formed. .
- the columns 7 are arranged such that the central axis in the long side direction of the cross section coincides with the radial direction of each magnet.
- the struts 5 and the struts 7 extend from the upper surface of the upper magnet 1 to the lower magnet. It has the same cross section up to the lower surface of the stone 3 and extends in the vertical direction.
- the width of the support 5 in a direction perpendicular to a straight line connecting the centers of the support 5 and the support 7 is, for example, 680 mm, and the width of the support 7 is, for example, 265 mm.
- the column 7 having a small cross-sectional area is arranged so as to be close to the side where the top plate 11 is inserted. That is, as shown in FIG. 2, the bed 9 is arranged such that the column 7 is located on the right-hand side and the column 5 is located on the left-hand side when viewed from the side where the top plate 11 is inserted.
- Fig. 8 shows the results of a simulation of the accessible perimeter of the outer edge of the magnet for ⁇ .
- FIG. 8 (b) shows how the change is made when ⁇ is changed for Di X 2 and D 2 shown in FIG. 8 (a). here,
- the reason for doubling D 2 is that it is necessary to access the subject from the side at least in one direction, and therefore, considering the space that the surgeon stands upright, twice as large as D 2 It is thought that it is better if it is larger than the width of the surgeon.
- the dotted line in Fig. 8 (b) is the minimum space that can be set up by humans, and it would be better if Di X 2 and D 2 were larger than this. It can be seen from FIG. 8 (b) that the range where ⁇ can be assured is preferably set to 15 to 45 °, preferably 25 to 35 °.
- the width of the column 7 having a small cross-sectional area is at most from the viewpoint of making the subject feel a clear open feeling based on the difference between the widths of the two columns. It is empirically preferable that the width of the support 5 having a large cross-sectional area be 1/2 or less. Of course, the width of the column 7 having a small cross-sectional area is better.
- FIG. 3 is an elevation view of the MRI apparatus of FIG. 2 viewed from a direction perpendicular to the longitudinal direction of the bed 9.
- the couch 9 includes a couch base 10 and a couchtop 11, and the couch base 10 has a mechanism capable of realizing the vertical movement, the horizontal movement, and the vertical movement of the couchtop 11, and the couchtop 11 positioned above the couch base 10 Can be inserted at any position. Further, for example, four legs are provided in a portion of the lower magnet 3 covered by the cover 13.
- a bed fixing bracket that supports the upper and lower magnets and a pair of columns, and projects from the side wall of the cover 13 below the lower magnet 3 and is connected to the bed connecting portion 16 below the bed base 10. 15 are provided.
- FIG. 4 is a diagram showing a state when the MRI apparatus of the present embodiment is used.
- the subject V7 which is the subject, lies on the top 11.
- the top plate 11 is inserted into the measurement space between the upper magnet 1 and the lower magnet 3 along the central axis in the longitudinal direction, and the part to be diagnosed of the subject is located substantially at the center of the upper and lower magnets. To be moved.
- the head of the subject is the site to be diagnosed.
- the surgeon such as a doctor, determines which of the region A between the support 5 and the top 11, the region B between the top 11 and the support 7, and the region C between the support 7 and the support 5. From this position, operate the MRI apparatus and perform necessary treatment for subject ⁇ 7.
- the surgeon 19, who is a doctor often stands mainly in the area A. From this area, the condition of the subject ⁇ 7 can be continuously and well observed before and after insertion between the magnets. Easy access.
- the operator's assistant can operate the device and perform treatment on the subject ⁇ 7 from the area B or C, and multiple doctors 19 and assistants 21 can use one or more of A, B, and C
- the subject 17 can also be accessed from the area.
- the top plate 11 is inserted at an angle of 30 ° with respect to a straight line perpendicular to the straight line connecting the centers of the struts, there is no strut immediately beside the body axis of the subject. Access to the subject from the subject is easy, and the subject has a sense of openness. Further, when the table 11 is inserted from the side where the top plate 11 is inserted, that is, when inserted from the head side of the subject, since the cross-sectional area of the column 7 which is arranged shifted to the foot side is small, the column 7 is attached to the subject. It does not hinder access.
- FIG. 5 is a plan view of a second embodiment of an MRI apparatus to which the present invention using such a configuration is applied.
- the same components as those in the above-described first embodiment are denoted by the same reference numerals. With such a configuration, it is possible to obtain the same effects as those of the first embodiment.
- FIG. 6 As shown in Fig. 6, the top plate 11 is inserted from the side of the column 5 with a large cross-sectional area (that is, the position at which it is approximately -90 °), so that the column 7 with a small cross-sectional area in Fig. 4 is sandwiched between them.
- the accessibility of the two operators B and C is maximized.
- Such improvement in accessibility is due to the small cross-sectional area of the support 7 interposed therebetween.
- FIG. 6 As same applies to the case of the second embodiment in FIG.
- the pair of columns have the same cross section, and have a vertically extending shape.
- the present invention is not limited to this.
- only one of the columns may be curved.
- the cross-sectional shape of each support may be the same as in the above embodiment.
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- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/519,891 US20060033495A1 (en) | 2002-07-01 | 2003-06-30 | Magnetic resonance imaging device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002-191986 | 2002-07-01 | ||
JP2002191986A JP4143812B2 (ja) | 2002-07-01 | 2002-07-01 | 磁気共鳴イメージング装置 |
Publications (1)
Publication Number | Publication Date |
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WO2004002306A1 true WO2004002306A1 (ja) | 2004-01-08 |
Family
ID=29996953
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/008282 WO2004002306A1 (ja) | 2002-07-01 | 2003-06-30 | 磁気共鳴イメージング装置 |
Country Status (3)
Country | Link |
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US (1) | US20060033495A1 (ja) |
JP (1) | JP4143812B2 (ja) |
WO (1) | WO2004002306A1 (ja) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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US7116198B1 (en) * | 2004-09-10 | 2006-10-03 | Brk Wireless Company, Inc. | MRI conical magnet imaging system |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06176917A (ja) * | 1992-08-05 | 1994-06-24 | General Electric Co <Ge> | 開放形磁気共鳴イメージングに適した磁石 |
US5517121A (en) * | 1995-01-13 | 1996-05-14 | Toshiba America Mri, Inc. | MRI system with side-access to an image volume located within a two-column main magnet |
JPH09299352A (ja) * | 1996-05-16 | 1997-11-25 | Hitachi Medical Corp | 磁気共鳴イメージング装置 |
JPH10127602A (ja) * | 1996-10-30 | 1998-05-19 | Hitachi Medical Corp | 超電導磁石装置 |
JPH10135027A (ja) * | 1996-10-30 | 1998-05-22 | Hitachi Medical Corp | 超電導磁石装置 |
JPH11104109A (ja) * | 1997-10-07 | 1999-04-20 | Shin Etsu Chem Co Ltd | 磁場発生装置 |
JP2000005143A (ja) * | 1998-06-19 | 2000-01-11 | Sumitomo Special Metals Co Ltd | Mri用磁界発生装置、mri用磁界発生装置の梱包用部材、およびmri用磁界発生装置の梱包方法 |
JP2002209869A (ja) * | 2001-01-15 | 2002-07-30 | Mitsubishi Electric Corp | 超電導マグネット装置およびその製造方法 |
JP2002325743A (ja) * | 2001-05-02 | 2002-11-12 | Shin Etsu Chem Co Ltd | Mri用磁気回路構造 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
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US4829252A (en) * | 1987-10-28 | 1989-05-09 | The Regents Of The University Of California | MRI system with open access to patient image volume |
US6335623B1 (en) * | 1992-12-18 | 2002-01-01 | Fonar Corporation | MRI apparatus |
JP2774777B2 (ja) * | 1994-11-25 | 1998-07-09 | 株式会社日立メディコ | 磁気共鳴イメ−ジング装置 |
DE19736884A1 (de) * | 1997-08-25 | 1999-03-18 | Siemens Ag | Erweitertes diagnostisches Magnetresonanzgerät mit Operationsfunktionalität |
US6828792B1 (en) * | 1999-11-24 | 2004-12-07 | Fonar Corporation | MRI apparatus and method for imaging |
JP3934312B2 (ja) * | 2000-07-11 | 2007-06-20 | 株式会社日立メディコ | 磁気共鳴イメージング装置 |
US6717408B2 (en) * | 2001-04-05 | 2004-04-06 | Intermagnetics General Corporation | Support structure for open MRI apparatus |
JP4093736B2 (ja) * | 2001-06-28 | 2008-06-04 | 株式会社日立メディコ | 核磁気共鳴診断装置および診断システム |
-
2002
- 2002-07-01 JP JP2002191986A patent/JP4143812B2/ja not_active Expired - Fee Related
-
2003
- 2003-06-30 WO PCT/JP2003/008282 patent/WO2004002306A1/ja active Application Filing
- 2003-06-30 US US10/519,891 patent/US20060033495A1/en not_active Abandoned
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06176917A (ja) * | 1992-08-05 | 1994-06-24 | General Electric Co <Ge> | 開放形磁気共鳴イメージングに適した磁石 |
US5517121A (en) * | 1995-01-13 | 1996-05-14 | Toshiba America Mri, Inc. | MRI system with side-access to an image volume located within a two-column main magnet |
JPH09299352A (ja) * | 1996-05-16 | 1997-11-25 | Hitachi Medical Corp | 磁気共鳴イメージング装置 |
JPH10127602A (ja) * | 1996-10-30 | 1998-05-19 | Hitachi Medical Corp | 超電導磁石装置 |
JPH10135027A (ja) * | 1996-10-30 | 1998-05-22 | Hitachi Medical Corp | 超電導磁石装置 |
JPH11104109A (ja) * | 1997-10-07 | 1999-04-20 | Shin Etsu Chem Co Ltd | 磁場発生装置 |
JP2000005143A (ja) * | 1998-06-19 | 2000-01-11 | Sumitomo Special Metals Co Ltd | Mri用磁界発生装置、mri用磁界発生装置の梱包用部材、およびmri用磁界発生装置の梱包方法 |
JP2002209869A (ja) * | 2001-01-15 | 2002-07-30 | Mitsubishi Electric Corp | 超電導マグネット装置およびその製造方法 |
JP2002325743A (ja) * | 2001-05-02 | 2002-11-12 | Shin Etsu Chem Co Ltd | Mri用磁気回路構造 |
Also Published As
Publication number | Publication date |
---|---|
US20060033495A1 (en) | 2006-02-16 |
JP2004033349A (ja) | 2004-02-05 |
JP4143812B2 (ja) | 2008-09-03 |
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