MRI Safety Final Exam with precise detailed solutions

MRI Safety Final Exam with precise detailed solutions
|| || || || || || ||




What in MRI causes thermal heating? - correct answer✔✔RF field
|| || || || || || || || ||




What can induce peripheral nerve stimulation in MRI? - correct answer✔✔Transient
|| || || || || || || || || || ||




magnetic field (time varying magnetic field)
|| || || || ||




SAR is measured in _____ per ________. - correct answer✔✔watts, kilogram
|| || || || || || || || || ||




Where does the maximum peripheral nerve stimulation occur in the MRI magnet? - correct
|| || || || || || || || || || || || || ||




answer✔✔Periphery of the imaging volume || || || ||




What is an appropriate frequency range for a radiofrequency pulse in MRI? - correct
|| || || || || || || || || || || || || ||




answer✔✔30 MHz ||




What do we call the intensity of RF energy deposition in tissue? - correct answer✔✔Specific
|| || || || || || || || || || || || || ||




Absorption Rate
|| ||




What can induce magnetic phosphenes? - correct answer✔✔Time varying magnetic field
|| || || || || || || || || ||




Does MRI have a long term effect? - correct answer✔✔No
|| || || || || || || || ||




Which type of shielding ensures the RF energy that is present outside zone IV does not
|| || || || || || || || || || || || || || || ||




interfere with image production inside the scan room? - correct answer✔✔Faraday
|| || || || || || || || || || ||




shielding

, The maximum SAR value for an MR system in first-level controlled mode must not raise the
|| || || || || || || || || || || || || || ||




patient's core body temperature by more than 1 degree Celsius. (T/F) - correct
|| || || || || || || || || || || || || ||




answer✔✔TRUE



If the MR scanner indicated that the pulse sequence exceeds the SAR limit for the given
|| || || || || || || || || || || || || || || ||




patient, what parameters can you change as a technologist? - correct answer✔✔Reduce flip
|| || || || || || || || || || || || ||




angle, reduce echo train length, reduce the number of slices per acquisition, increase time
|| || || || || || || || || || || || || ||




between RF pulses || ||




These individuals have a deep knowledge base in physics, MR equipment, and biophysics of
|| || || || || || || || || || || || ||




electromagnetism - correct answer✔✔MRSE
|| || || ||




They ensure the safety of all patients, staff, and visitors at all times when the scanners are
|| || || || || || || || || || || || || || || || ||




operating - correct answer✔✔MRMD || || ||




Their responsibility is the day-to-day safe operation of the MRI unit - correct
|| || || || || || || || || || || || ||




answer✔✔MRSO



The symbol for the RF field can be labeled as B1. (T/F) - correct answer✔✔True
|| || || || || || || || || || || || || ||




If an MRI facility does not have a dedicated Zone II, what is required? - correct
|| || || || || || || || || || || || || || || ||




answer✔✔Additional safety measures may need to be incorporated || || || || || || ||




Scanner room temperature should never pass ____ degrees Fahrenheit - correct
|| || || || || || || || || || ||




answer✔✔70



Scanner room should be at a humidity level of ___% to ___% at all times - correct
|| || || || || || || || || || || || || || || || ||




answer✔✔30, 60 ||