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热词
    • 3. 发明公开
    • Magnetic resonance imaging apparatus
    • Apparat zur Bilderzeugung mittels magnetischer Resonanz。
    • EP0430104A2
    • 1991-06-05
    • EP90122419.6
    • 1990-11-23
    • KABUSHIKI KAISHA TOSHIBA
    • Konishi, Mineyuki, c/o Intellectual Property Div.
    • G01R33/36G01R33/38G01R33/42
    • G01R33/42G01R33/422
    • In a magnetic resonance imaging apparatus, a radiofrequency shielding body (20), which is disposed between the gradient magnetic field generating coils (12) and the radio-frequency coil (13) for interrupting electromagnetic coupling between the gradient magnetic field generating coils (12a, 12b, 12c) and the radio-frequency coil (13) due to the radio-frequency pulse applied to the radio-frequency coil (13), is formed of a conductive material having a thickness less than the skin depth defined by where π stands for the ratio of the circumference of a circle to its diameter, fo stands for the Larmor frequency of atomic nuclei of an imaging object, µ stands for the conductivity of the conductive material and σ stands for the magnetic permeability of the conductive material.
    • 在磁共振成像装置中,设置在倾斜磁场产生线圈(12)和射频线圈(13)之间的用于中断倾斜磁场产生线圈(12a)之间的电磁耦合的射频屏蔽体(20) ,12b,12c)和由射频线圈(13)施加的射频脉冲引起的射频线圈(13)由导电材料形成,导电材料的厚度小于由其中pi表示圆周长与其直径的比率,fo表示成像对象的原子核的Larmor频率,μ表示导电材料的导电率,sigma表示导电性的导磁率 材料。