5.超伝導応用機器 : 5.1磁気共鳴イメージング装置(MRI)(<講座>超伝導技術IV)

概要

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MRI (Magnetic Resonance Imaging) is a process which makes tomographic images of the human body, and employs NMR (Nuclear Magnetic Resonance). By using MRI systems employing superconducting magnets, a magnetic field as high as 0.5〜1.5T can be utilized, whereby the S/N ratio of the NMR signal is improved and an image of high quality can be obtained. An inside diameter of about Im is necessary for the magnet space at room temperature for whole body imaging. The uniformity of the magnetic field must be about 10ppm or less. The stability of the magnetic field must be 0.1ppm/h or less. The consumption of liquid helium must be 0.05〜0.11/h or less. Light weight, compactness, economical efficiency, and easy maintenance are required, too. For more expansive propagation of MRI in future, strong magnetic field and high speed imaging are required.
社団法人プラズマ・核融合学会の論文
1994-11-25