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2001 Fiscal Year Final Research Report Summary

Development of Desktop MR Microscopes

Research Project

Project/Area Number 12555016
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Applied physics, general
Research InstitutionUniversity of Tsukuba

Principal Investigator

KOSE Katsumi  Institute of Applied Physics, Professor, 物理工学系, 教授 (60186690)

Project Period (FY) 2000 – 2001
KeywordsMRI / MR Microscope / permanent magnet / NMR
Research Abstract

Compact MR microscopes were developed using yokeless permanent magnets. Two different size permanent magnets with 1.0 T central magnetic fields were used ; larger one : gap width ; 60 mm, weight ; 210 kg, size ; 36 cm x 32 cm x 28 cm, homogeneous regions ; 20 mm dsv (13 ppm), and smaller one : gap width ; 41 mm, weight ; 85 kg, size ; 27 cm x 24 cm x 18 cm, homogeneous regions ; 13 mm dsv (13 ppm). The most serious problem in the development of the MR microscopes was temperature drift of the central magnetic field mainly due to the large negative temperature coefficient (-1200 ppm/deg) of the residual magnetic flux density of the Nd-Fe-B magnetic material. Long-term changes of magnet temperatures and Larmor precession frequencies were measured under various thermal conditions of the magnets. As a result, we concluded that the internal NMR locking technique in a time-sharing mode of which time interval was several minutes could compensate the frequency drift and present high-resolution 3D images of chemically fixed animal samples with less than 100 microns cube voxel dimensions.

  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] N.Ishida et al.: "Architecture of baked bread depicted by a magnetic resonance imaging"Magnetic Resonance Imaging. 19. 867-874 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Haishi et al.: "Development of a 1.0T MR microscope using a Nd-Fe-B permanent magnet"Magnetic Resonance Imaging. 19. 875-880 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Yoshioka: "MR microscopy of articular carilage at 1.5T"Skeltal Radiology. 31. 505-510 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Nobuaki Ishida, Hiroyuki Takano, Shigehiro Naito, Seiichiro Isobe, Kunihiko Uemura, Tomoyuki Haishi, Katsumi Kose, Mika Koizumi, Hiromi Kano: "Architecture of baked breads depicted by a magnetic resonance imaging"Magnetic Resonance Imaging. 19. 867-874 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tomoyuki Haishi, Takaaki Uematsu, Yoshimasa Matsuda, Katsumi Kose: "Development of a 1.0 T MR microscope using a Nd-Fe-B permanent magnet"Magnetic Resonance Imaging. 19. 875-880 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hiroshi Yoshioka, Tomoyuki Haishi, Takaaki Uematsu, Yoshimasa Matsuda, Izumi Anno, Junko Echigi, Philipp Lang, Yuji Itai, Katsumi Kose: "MR microscopy of articular cartilage at 1.5 T : orientation and site dependence of laminar structures"Skeltal Radiol.. 31. 505-510 (2002)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2004-04-14  

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