Mrso Prep All 2024 Questions & Correct Revised Answers Already Passed

This agency regulates MRI sound pressure levels {Ans: FDA}Lorenz Force {Ans: The torque caused on the MR gantry as the gradient coils are activated. This produces the noises heard in MRI.}Localized Transmit-Receive Coil Heating Limits for First Level Mode {Ans: FDA/IEC SAR equal to or less than 20W/kg in the head or trunk (orbits limited to 1* Celsius). SAR equal to or less than 40W/kg in extremities.}Nystagmus {Ans: Involuntary rapid eye movements caused by exposure to a changing magnetic field due to Faraday's Law of Induction in the Optic Nerve.}Time-Varying RF Field Concerns {Ans: The deposit of Heat (measured in SAR). Localized Heating to: Eyes, Fetus, & Testicles. RF Burning.}Passive Implants: Wires/Leads/Sutures {Ans: >2cm can induce heating. Length, Orientation, Size, Location, Position, and Material need to be considered. Risk of Static Magnetic Field - Can cause implant to to migrate. Risk of Time Varying Magnetic/Gradient Field - Can induce electrical current and stimulate tissue at the end of the leads. If stimulation interferes with cardiac process, neurological processes, or respiratory processes, may cause harm to patient. Time Varying Radiofrequency Fields - Causes the greatest risk. Can induce significant heat at the end of the