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Magnetic resonance imaging (MRI) diagnostic apparatus capable of optimally controlling radio-frequency magnetic field by providing flexible material interposed between RF coil and body

  • US 5,865,177 A
  • Filed: 01/24/1996
  • Issued: 02/02/1999
  • Est. Priority Date: 06/24/1993
  • Status: Expired due to Fees
First Claim
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1. A magnetic resonance imaging (MRI) diagnostic apparatus for applying a radiofrequency (RF) pulse to a biological body, and for acquiring nuclear magnetic resonance (NMR) signals therefrom to be reconstructed to obtain an MRI image, the apparatus comprising:

  • an RF coil for applying the RF pulse directed to the biological body; and

    a field correcting means of a sheet material filled with a high molecular gel with a dielectric constant greater than 30 and having a magnetic susceptibility approximately within +150% of the biological body, said sheet material interposed between the RF coil and a position where the biological body is to be placed, said sheet material of a deformable material, and having a contact surface, capable of supporting the biological body to create a contiguous and direct contact between the contact surface and the biological body, and for correcting a distribution of an RF magnetic field at the time of RF transmitting or receiving by the RF coil.

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