MRI (1)

• Types of MRI based on Tesla

  • Low-field MRI (Under 0.2 Tesla)
  • Mid-field MRI (0.2-0.6 Tesla)
  • High-field MRI (1.0-1.5 Tesla)
• Raymond Damadian's research into sodium and potassium in living cells led him to his first experiments with nuclear magnetic resonance (NMR) which caused him to first propose the MR body scanner


  1969
• Paramagnetic materials

  • Contrast agents used in MRI
• Superconducting magnets


  • High magnetic field strengths (0.5-3T) with low power requirements
  • Low operating costs
  • No resistance, no power input required to maintain high field
  • Advanced applications and optimum image quality
  • High capital cost
  • Significant fringe fields requiring shielding
  • Unsuitable for large or claustrophobic patients, difficult for interventional and dynamic studies