Key Points MRI: The magnet is always on Know the essential components of an MRI system Know general idea of how MRI captures an image; three steps Why do we need liquid helium in an MRI unit? Know the difference between ramping up, ramping down, and quenching Know what ferromagnetism is and why it matters: image artifacts AND object dislocation within the body AND projectile danger Know what material is being measured & imaged in fMRI Know the advantages of MRI compared to CT: no ionizing radiation, and MRI images soft tissue The magnet is always on
