MRI Safety Exam Questions and Answers, Exams of Nursing

Download MRI Safety Exam Questions and Answers and more Exams Nursing in PDF only on Docsity! MRSO: Exam 1 questions well answered graded A+ 2023 The control room is found where? a. Zone I b. Zone II c. Zone III d. Zone IV - correct answer C. Zone III Which of the following describe when a non-ferrous object is repulsed by static magnetic field? a. Fourier transformation b. Lenz's force c. Ohm's law d. Larmor equation - correct answer b. Lenz's force Which of the following are recommended by the ACR Guidance document in MR safety 2013 in proper scanning of a patient? I. Metal detector II. Ferromagnetic detection system III. Written screening sheet IV. Patient gown a. I, III, IV b. I, II, III, IV c. II, III, IV d. III - correct answer c. II, III, IV What is the FDA SAR limit for the whole body in first level controlled operating mode? a. 8 W/kg for 15 mins b. 4 W/kg for 15 mins c. 3 W/kg for 10 mins d. 7 W/kg for 20 mins - correct answer b. 4 W/kg for 15 mins Gadolinium contains what kind of magnetism? a. Diamagnetic b. Paramagnetic c. Ferromagnetic d. Super paramagnetic - correct answer b. Paramagnetic Which of the following is true of Zone IV? Select all that apply. a. This area should be monitored by a level 2 MR personnel b. Should be noted with signage c. Contain metal detectors for implant identification d. No unsafe implants may cross the 5-gauss unless the implant is researched and analyzed for risk - correct answer a, b, d Where will peripheral nerve stimulation be the strongest? a. Further away from isocenter in the gantry b. At the level of the table when it is advanced c. At isocenter d. Outside the gantry near the 5 gauss line - correct answer a. Further away from the isocenter in the gantry A patient is advanced in the MRI scanner very quickly and experiences a sensation of flashing lights in their visual field. What are they experiencing? a. Nystagmus b. Heating c. Magnetophosphenes d. Magnetohydrodynamic effect - correct answer c. Magnetophosphenes What is the name for the direction of the vector of the static magnetic field? a. Inverse field b. Equilibrium c. B0 d. B1 - correct answer c. B0 An object that produces a weakly repulsive force in the presence of a strong magnetic field is called what? a. Superparamagnetic b. Ferromagnetic c. Diamagnetic d. Paramagnetic - correct answer c. Diamagnetic What are the risks associated with translational force? a. Missile effect b. Proximity heating c. Antenna effect d. Peripheral nerve stimulation - correct answer a. Missile effect Which of the following are recommended by the ACR guidance document in MR safety 2013 in proper scanning of a patient? a. Patient gown b. Written screening sheet c. Metal detector d. Ferromagnetic detection system - correct answer The allowable maximum strength of the gradient coils is called? a. Spacial gradient b. Rise time c. Slew rate d. Maximum gradient peak - correct answer d. Maximum gradient peak Using a headset and earplugs will reduce noise by how much? a. 50 dB b. By the NRR of the headset + NRR of earplugs c. By the NRR of the headset d. By the NRR of the headset + NRR of earplugs divided by 2 - correct answer b. By the NRR of the headset + NRR of earplugs Wires and leads can produce heat because they are? a. Magnetic b. Diamagnetic c. Electrically conductive d. Reactive - correct answer c. Electrically conductive Time-varying gradient magnetic fields are measured in which of the following? a. W/kg b. Tesla c. dB/dt d. dB/dx - correct answer c. dB/dt "d"=change in "B"=static field strength "t"=time Therefore this means that a change in static field strength over a change in time. Gad contrast will affect tissue when...? a. It touches tissues b. None of the choices c. It is in very close proximity to tissue d. It doesn't touch tissue - correct answer c. It is in very close proximity to tissue The FDA limits SAR in the head to what? a. 3.2 W/kg for 10 min b. 8 W/kg for 20 min c. 10 W/kg for 15 min d. 4 W/kg for 15 min - correct answer a. 3.2 W/kg for 10 min The gradient coils are used for what in MRI? a. Tilting nuclei in to the transverse plane b. Spacial encoding c. Resonance production d. Aligning nuclei to a vector - correct answer b. Spatial encoding Which of the following are considered non-allergic reactions to the gad contrast? Select all that apply. a. Pain at injection site b. Emesis c. Headache d. Hives - correct answer a,b,c Passive shield is performed how? a. A magnetically conductive material surrounds the MR unit and this shapes and contains the magnetic field b. Bricks permanent magnets are stacked around the MR unit to contain the fringe field c. Nothing is used with passive shielding d. A coil of wire in the MR unit has a current running through it which produces a magnetic field opposing the B0 - correct answer a. A magnetically conductive material surrounds the MR unit and this shapes and contains the magnetic field An object that retains a magnetic field as it is removed from a strong magnetic field is called what? a. Paramagnetic b. Ferromagnetic c. Diamagnetic d. Superparamagnetic - correct answer b. Ferromagnetic The speed that the gradient coils can turn on and off is called what? a. Maximum gradient peak b. Rise time c. Spatial gradient d. Slew rate - correct answer d. Slew rate The speed that it takes a gradient coil to reach a maximum strength is called what? a. Maximum gradient peak b. Rise time c. Spatial gradient d. Slew rate - correct answer b. Rise time A patient undergoing an MRI exam is given an icepack to reduce heat. Which of these methods is the patient using to regulate their increased heating? a. Convection b. Conduction c. Radiation d. Evaporation - correct answer b. Conduction Which of the following are units of measurement for static magnetic fields? a. Tesla and gauss b. Tesla c. Gauss d. Decibels - correct answer a. Tesla & gauss What is the purpose of the static magnetic field? a. To align hydrogen nuclei parallel and anti-parallel to B0 b. To reverse the spin of the hydrogen nuclei c. To produce currents in tissues containing hydrogen nuclei d. To measure the movement of hydrogen nuclei - correct answer a. To align hydrogen nuclei parallel and anti-parallel to B0 Induction of electrical current in our patient from changing magnetic fields can be described by which of the following? a. Ohm's law b. Fourier equation c. Faraday's law of induction d. Larmor equation - correct answer c. Faraday's law of induction A patient will change into a gown in this location. a. Zone I b. Zone IV c. Zone II d. Zone III - correct answer c. Zone II The IEC 60601-2-33 normal operating mode is __________ the energy requirements limited in the first level controlled operating mode. a. Half b. Triple c. Double d. Not comparable to - correct answer a. Half An object that produces a weakly attractive force in the presence of a strong magnetic field is called what? a. Superparamagnetic b. Ferromagnetic c. Diamagnetic d. Paramagnetic - correct answer d. Paramagnetic The noise heard in MRI is caused by which of the following? a. Lorentz force b. The antenna effect c. Larmor force d. Ohm's force - correct answer a. Lorentz force