MRSO Mock Test 1 Questions with Correct Answers.docx

MRSO Mock Test 1 Questions with Correct A What pulse sequence will produce the most patient heating? A. Inverse recovery sequence B. Single shot fast spin echo C. Conventional spin echo D. Gradient Echo - Answer-B. Single shot fast spin echo During acquisition, it is noticed that the T wave of the cardiac cycle is elevated. What is this artifact called? A. Magnetohydrodynamic Effect B. Excitation C. Teratogenesis D. Magnetophosphenes - Answer-A. Magnetohyrdodynamic Effect When can heating occur in a wire? A.Only in ferrous object B.When the transmitted wavelength is half of the B0 field strength or is a multiple of the length of that C.When objects get smaller D.In small round metal objects - Answer-B. When the transmitted wavelength is half of the B0 field strength or is a multiple of the length of that What unit of measure is used for SAR? A. A/1b B. dB/dx C. dB/dt D. W/kg - Answer-D. W/kg energy requirements limited in the first level controlled operating mode. A. Triple B. Double C. Half D. Not comparable to - Answer-C. Half Which of the following are recommended by the ACR guidance in MR Safety 2013 in proper scanning of a patient? A.Metal Detector B.Ferromagnetic detection system C. Written screening sheet D. Patient Gown - Answer-B. Ferromagnetic detection system C. Written screening sheet D. Patient Gown Using a headset and ear plugs will reduce the noise by how much? A.By the NRR of headset B.By the NRR of the headset and NRR of earplugs C. 50 dB D. By the NRR of the headset and the NRR of earplug divided by 2 - Answer-B. By the NRR of the headset and NRR of earplugs What is the FDA SAR limit for the whole body in first level controlled operating mode? A. 7 W/kg for 6 min B. 4 W/kg for 6min C. 3 W/kg for 6 min D. 8 W/kg for 6 min - Answer-B. 4 W/kg for 6 min Which of the following is true of Zone IV? Select all that apply. A.Should be noted with signage B.No unsafe implants may cross the 5-guass unless implant is researched and analyzed for risk C.Contain metal detectors for implant identification D.This area should be monitored by a level 2 MR personnel - Answer-A. Should be noted with signage B. No unsafe implants may cross the 5-guass unless implant is researched and analyzed for risk D. This area should be monitored by a level 2 MR personnel Pain at the injection site when gadolinium contrast is administered is considered what? A. None of these choices B. Anaphylaxis C. An allergic reaction D. A non-allergic reaction - Answer-D. Non allergic reaction How long does it take to excrete gadolinium contrast from a patient with normal kidney function? A.24 hours B.48 hours C. 4 hours D. 9 hours - Answer-A. 24 Hours How many gauss are in one Tesla? A. 10 B. 10,000 C. 100 D. 1,000 - Answer-B. 10,000 Gadolinium contains what kind of magnetism? A. Super paramagnetic B. Ferromagnetic C. Paramagnetic D. Diamagnetic - Answer-C. Paramagnetic The T wave in the cardiac cycle represents what? A. Heart Depolarization B. None of the choices C. Arrythmia D. Heart Repolarization - Answer-D. Heart Repolarization An energy deposition mode set to normal operation mode will allow heating in a patient to what? A. 0.5 deg C B. 1 deg C C. 2 deg C D. 3 deg C - Answer-A. 0.5 deg C The gradient coils are used for what in MRI? A.Aligning nuclei to a vector B.Resonance production C. Spatial encoding D. Tilting nuclei in to the transverse plane - Answer-C. Spatial Encoding What does discovery mean in a court case? A. A way to get records on someone named in a case B. A process of sentencing a defendant C. All of the choices D. A new turn of events in a court case - Answer-A. A way to get records on someone named in a case Which of the following can be used to test if an object is ferrous? A.Metal detector B.Ferromagnetic detection system C. Tester magnet D. Radiograph - Answer-B. Ferromagnetic detection system C. Tester magnet Wire and leads can produce heat because they are what? A. Magnetic B. Reactive C. Diamagnetic D. Electrically conductive - Answer-D. Electrically conductive Why are metal detectors not recommended in MR screening? A. They cannot detect small fragments well B. They have varied sensitivity C. They are operator skill dependent D. All of the choices - Answer-D. All of the choices A patient is advanced in the MRI scanner very quickly and experiences the sensation of flashing lights in their visual field. What are they experiencing? A.Nystagmus B.Magnetophosphenes C.Magnetohydrodynamic effect D.Heating - Answer-B. Magnetophosphenes Which of the following is a short term effect of gadolinium based contrast? A. Gadolinium retention B. NSF C. Nausea D. GAP - Answer-C. Nausea What gradient coil will produce axial images? A. X Gradient B. Y Gradient C. Z Gradient D. All of the choices - Answer-C. Z Gradient A headache after contrast injection is considered what? A. None of the choices B. Anaphylaxis C. Allergic reaction D. Non allergic reaction - Answer-D. Non allergic reaction The invisible fields that flow from the north pole to south pole of a magnet are called? A.Voltages B.Radiant fields C. Electrical current D. Magnetic flux lines - Answer-D. Magnetic Flux lines The transmission of radiofrequency waves will cause what? A. Peripheral nerve stimulation B. Patient heating C. Magnetohydrodynamic effect D. Vertigo - Answer-B. Patient heating Unsafe electrical devices in patients should be restricted from which of the following? A. Entering Zone 2 B. Entering Zone 1 C. Crossing the 5-gauss line D. Crossing the 10-gauss line - Answer-C. Crossing the 5-gauss line Which of the following is used to measure patient heating? A.Patient heating ratio B.Specific energy resonance C. Set absorption ratio D. Specific absorption rate - Answer-D. Specific Absorption Rate What type of MRI unit uses many bricks of magnets to produce a strong static field? A.All of choices B.Resistive magnet C. Permanent Magnet D. Superconducting magnet - Answer-C. Permanent Magnet Which of the following are units of measurements for static magnetic fields? A. Decibels B. Tesla C. Gauss D. Tesla and Gauss - Answer-D. Tesla and Gauss When does resonance occur? A. When the patient is placed in isocenter and only experiences the static magnetic field B. When the radiofrequencies transmitted match the precessional speed of hydrogen. C. When the radiofrequencies are different than the precessional speed of hydrogen. D. When the radiofrequency is transmitted at 42.6 MHz - Answer-B. When the radiofrequencies transmitted match the precessional speed of hydrogen. An object that produces a weak repulsive force in presence of a strong magnetic field is called what? A. Diamagnetic B. Paramagnetic C. Superparamagnetic D. Ferromagnetic - Answer-A. Diamagnetic What does the image of MR with a red circle and slash through it represent? A.MR Unsafe B.MR Conditional C. MR Safe D. MR Compatible - Answer-A. MR Unsafe Where is Cryogen found? A. In the MR unit B. In zone 3 C. In the equipment room D. In the quench vent - Answer-A. In the MR Unit Normal kidneys should excrete all gadolinium contrast from a patient how quickly? A.48 hours B.24 hours C. 6 hours D. 12 hours - Answer-B. 24 hours The noise hear in MRI is caused by which of the following? A.Lorentz Force B.The antenna effect C. Larmor force D. Ohms Force - Answer-A. Lorentz Force The speed that it takes a gradient coil to reach maximum strength is called what? A. Slew rate B. Rise time C. Spatial gradient D. Maximum gradient peak - Answer-B. Rise Time What is the purpose of a cryogen? A.To reduce the overall noise produced during acquisition B.To reduce the heating produced in the MRI unit during each acquisition. C.To eliminate the resistance of electrical current in the coils of wire that produce the static magnetic field D.To allow the MRI unit to function at the fast speeds necessary to achieve an MRI image. - Answer-C. To eliminate the resistance of electrical current in the coils of wire that produce the static magnetic field How loud are noised restricted to in MRI when considering the A- weighting? A.69 decibels B.99 decibels C.120 decibels D.40 decibels - Answer-B. 99 decibels Which of the following are not recommended by the ACR guidance document in MR safety 2013 in proper scanning of a patient? A. Metal detector B. Patient Gown C. Written screening sheet D. Ferromagnetic detection system - Answer-A. Metal detector What type of MRI unit uses a coil of a wire with a current running through it and a cryogen to produce a strong magnetic field? A. Resistive magnet B. All of the choices C. Permanent Magnet D. Superconducting Magnet - Answer-D. Superconducting Magnet Contrast media will do what to tissue? A. Increase T2 relaxation times and decrease T1 relaxation times. B. Shorten T1 relaxation times C. Shorten T2 relaxation times D. Shorten T1 and T2 relaxation times - Answer-D. Shorten T1 and T2 relaxation times Where are the gradient coils found? A.In zone 3 B.Under the patient C.Surrounding the patient D.At the control panel on the MR unit - Answer-C. Surrounding the patient The process of releasing cryogen from the MR unit is called? A. Valve opening B. Quench C. Depressurization D. Release - Answer-B. Quench The allowable maximum strength of the gradient coils is called what? A. The rise time B. Spatial gradient C. Maximum gradient peak D. The slew rate - Answer-C. Maximum gradient peak As blood flows through a vessel, currents can be induced. The degree of this is called? A. Magnetophosphenes B. Fringe field C. Translational forces D. Flow potential - Answer-D. Flow potential A patient is undergoing an MRI exam and is given an ice pack to reduce heat. Which of these methods is the patient using to regulate their increased heating? A. Radiation B. Evaporation C. Convection D. Conduction - Answer-D. Conduction What GFR level indicates normal kidney function? A. 0ml/min/1.73m2 B. 60-89 mL/min/1.73m2 C. 30-45 mL/min/1.73m2 D. 45-60 mL/min/1.73m2 - Answer-B. 60-89 mL/min/1.73m2 A patient will change into a gown in this location? A. Zone 1 B. Zone IV C. Zone 3 D. Zone 2 - Answer-D. Zone 2 Which of the following describes an electrical current produced in a wire when subjected to an alternating magnetic field? A.Ohms Law B.Faradays law of induction C. Lorenz force D. Fourier Transformation - Answer-B. Faradays Law of induction What is the risk associated with rotational force? A. Peripheral nerve stimulation B. Missile effect C. Antenna effect D. Torque on an implant - Answer-D. Torque Implant Time-varying gradient magnetic fields are measured in which of the following? A. dB/dx B. Tesla C. dB/dt D. W/kg - Answer-C. dB/dt An object that retains a magnetic field as it is removed from a strong magnetic field is called what? A. Diamagnetic B. Ferromagnetic C. Superparamagnetic D. Paramagnetic - Answer-B. Ferromagnetic Why is magnetic shielding used on an MR unit? A.To limit fringe field B.To maintain field homogeneity C. To reduce the e-fields D. To reduce heating - Answer-A. To limit fringe field The control room is commonly found where? A. Zone 2 B. Zone 4 C. Zone 3 D. Zone 1 - Answer-C. Zone 3