JPS6449549A - Magnetic resonance imaging apparatus - Google Patents

Magnetic resonance imaging apparatus

Info

Publication number
JPS6449549A
JPS6449549A JP62206761A JP20676187A JPS6449549A JP S6449549 A JPS6449549 A JP S6449549A JP 62206761 A JP62206761 A JP 62206761A JP 20676187 A JP20676187 A JP 20676187A JP S6449549 A JPS6449549 A JP S6449549A
Authority
JP
Japan
Prior art keywords
magnetic
element pieces
bonding
yoke
thin plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP62206761A
Other languages
Japanese (ja)
Inventor
Toshiya Iinuma
Kenji Oyamada
Kimio Matsumoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP62206761A priority Critical patent/JPS6449549A/en
Publication of JPS6449549A publication Critical patent/JPS6449549A/en
Pending legal-status Critical Current

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  • Magnetic Resonance Imaging Apparatus (AREA)

Abstract

PURPOSE:To compensate the eddy current generated in a permanent magnet or magnetic yoke from a structural aspect and to reduce the effect exerted at the time of the formation of a gradient magnetic field, by forming at least one of the magnet and the yoke by bonding a block or thin plate-shaped magnet element pieces electrically insulated from each other and a yoke element piece. CONSTITUTION:A permanent magnet 11 is formed by bonding a block-shaped magnetic element pieces 111, 112... electrically insulated from each other or by attracting them by their own magnetic forces and a permanent magnet 12 is formed in the same way by bonding thin plate-shaped magnet element pieces 121, 122... electrically insulated from each other or by attracting them by their own magnetic forces. The thickness dimensions D1, D2 of the lock- shaped magnet element pieces 111, 112 and thin plate-shaped magnet element pieces 121, 122 are determined by 'skin-depth' when an eddy current flows to the magnetic material thereof and the eddy current is reduced by making the thickness dimensions D1, D2 thinner than 'that of skin'. By this constitution, a gradient power source can be miniaturized and reduced in its wt. and the cost reduction of the apparatus can be achieved.
JP62206761A 1987-08-20 1987-08-20 Magnetic resonance imaging apparatus Pending JPS6449549A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62206761A JPS6449549A (en) 1987-08-20 1987-08-20 Magnetic resonance imaging apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62206761A JPS6449549A (en) 1987-08-20 1987-08-20 Magnetic resonance imaging apparatus

Publications (1)

Publication Number Publication Date
JPS6449549A true JPS6449549A (en) 1989-02-27

Family

ID=16528649

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62206761A Pending JPS6449549A (en) 1987-08-20 1987-08-20 Magnetic resonance imaging apparatus

Country Status (1)

Country Link
JP (1) JPS6449549A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2770304A1 (en) * 1997-10-29 1999-04-30 Western Atlas Int Inc Permanent magnet structure and composition for bore hole NMR investigations
EP0978727A2 (en) * 1998-08-06 2000-02-09 Sumitomo Special Metals Company Limited Magnetic field generator for MRI, method for assembling the same and method for assembling a magnet unit for the same
EP1314393A1 (en) * 2000-08-28 2003-05-28 Hitachi Medical Corporation Magnet device and magnetic resonance imaging apparatus comprising it
JP2016096829A (en) * 2014-11-18 2016-05-30 株式会社日立製作所 Magnetic resonance imaging device

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2770304A1 (en) * 1997-10-29 1999-04-30 Western Atlas Int Inc Permanent magnet structure and composition for bore hole NMR investigations
GB2331809B (en) * 1997-10-29 2002-06-05 Western Atlas Int Inc NMR sensing apparatus and methods
EP0978727A2 (en) * 1998-08-06 2000-02-09 Sumitomo Special Metals Company Limited Magnetic field generator for MRI, method for assembling the same and method for assembling a magnet unit for the same
EP0978727A3 (en) * 1998-08-06 2001-05-02 Sumitomo Special Metals Company Limited Magnetic field generator for MRI, method for assembling the same and method for assembling a magnet unit for the same
US6336989B1 (en) 1998-08-06 2002-01-08 Sumitomo Special Metals Co., Ltd. Magnetic field generator for MRI, method for assembling the same, and method for assembling a magnet unit for the same
US6650214B2 (en) 1998-08-06 2003-11-18 Sumitomo Special Metals Co., Ltd. Magnetic field generator for MRI, method for assembling the same, and method for assembling a magnet unit for the same
US7065860B2 (en) * 1998-08-06 2006-06-27 Neomax Co., Ltd. Method for assembling a magnetic field generator for MRI
EP1314393A1 (en) * 2000-08-28 2003-05-28 Hitachi Medical Corporation Magnet device and magnetic resonance imaging apparatus comprising it
JP2016096829A (en) * 2014-11-18 2016-05-30 株式会社日立製作所 Magnetic resonance imaging device

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