MRSO Safety Exam Q & A 2024 with Complete Solution

MRSO Safety Exam Q & A 2024 with Complete Solution 180 degree RF - The amount of energy used to move hydrogen 180 degrees. This is used in a spin echo sequence to regain phase coherency. 90 degree RF - The amount of energy used to tilt hydrogen from longitudinal magnetism into the transverse axis Active shielding - The use of coil of wire, with an electrical current running through it, to produce an electromagnetic field opposing the static magnetic field, to reduce the fringe field B-sub zero - The unit used to describe the static magnetic field Bsub1 - The unit used to describe the time-varying RF magnetic field Deflection - The amount of attraction an object has to the static magnetic field Diamagnetism - A weakly repulsive force when placed in a strong static magnetic field E Fields - The electrical field is a result when a conductive material is exposed to a changing magnetic field Faraday's Law of Induction - This describes how electrical currents are produced in the presence of alternating magnetic field Ferromagnetism - An object with strong attractive force, in a strong static magnetic field, that retains a magnetic field even when leaving the strong static magnetic field First controlled mode - This is a mode where the maximum regulated limit of SAR is allowed during acquisition. This is limited to 4w/kg for the whole body. Flip angle - A variable RF pulse that will tilt hydrogen away from the longitudinal axis less than 90 degrees Frequency - The rate that something is repeated over a period of time Fringe field - The magnetic field that extends outside the MR unit Gauss - A magnetic field unit of measurement