MRSO Safety Questions with Complete Solutions 100% Verified Slew rate - Correct Answers Speed at which gradient coil turns on and off Time-varying Gradient - Correct Answers Induced current in a patient Magnetic Flux Lines - Correct Answers Travel from North to South pole permanent magnet - Correct Answers Can not be turned off Very inexpensive; extremely heavy Approximately 0.4T Vertical vector Resistive magnet - Correct Answers Can be turned on and off Costly due to cooling Approximately 0.6T Vertical or horizontal vector Superconductive magnet - Correct Answers Approximately 10T Low electricity; reasonable cost Active shielding - Correct Answers 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 - Correct Answers The unit used to describe the static magnetic field Deflection - Correct Answers The amount of attraction an object has to the static magnetic field Diamagnetism - Correct Answers A weakly repulsive force when placed in a strong static magnetic field Faraday's Law of Induction - Correct Answers This describes how electrical currents are produced in the presence of alternating magnetic field 1 / 2
Ferromagnetism - Correct Answers 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 Fringe field - Correct Answers The magnetic field that extends outside the MR unit Gauss - Correct Answers A magnetic field unit of measurement Lenz's force - Correct Answers The process of non-ferrous objects producing a magnetic field when moved through a strong static magnetic field Magnetic moment - Correct Answers An individual magnetic field produced by each hydrogen proton Magnohydrodynamic Effect - Correct Answers When a patient is exposed to a strong static magnetic field, their blood becomes magnetized. This causes elevated T wave in their cardiac cycle Paramagnetic - Correct Answers A weakly attractive force when placed in a static magnetic field Passive shielding - Correct Answers The use of magnetically conductive materials in an MR unit to reduce the fringe field Pauli Exclusion Principle - Correct Answers The principle that describes the atom structure and the types of magnetism (ferromagnetism, paramagnetism, etc) Rotational Force - Correct Answers A force which aligns objects affected by the static magnetic field to its flux lines Spatial Gradient Magnetic - Correct Answers The changing magnetic field strength demonstrated at different distances from the MR unit Static magnetic field - Correct Answers The magnetic field that aligns hydrogen nuclei parallel or anti- parallel
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