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MRSO EXAM QUESTIONS WITH COMPLETE
SOLUTIONS
A force which aligns objects affected by the static magnetic field to its flux lines. Correct Answers Rotational Force A form of energy that does not cause biological damage to tissues. Correct Answers Non-Ionization A herrington rod is an example of what? A. Passive implant. B. Active implant. C. Both Correct Answers A. Passive implant. A magnetic field unit of measurement. Correct Answers Gauss A magnetic field vector that is horizontal. Correct Answers Horizontal Static Magnetic Field A magnetic field vector that is vertical. Correct Answers Vertical Static Magnetic Field A pain pump implant manufacture instruction says the following. The pump is located in the abdomen. Do not scan directly over the implant. Field strengths of 3T or less are safe. Limit heating to 2.2 W/kg or 0/7 deg. Celsius. You are scanning on a 3T scanner and are performing a carotid MRA exam. Which of he following precautions should you follow? I. Do not give contrast media. II. Stay in normal controlled operation mode. III. Scan patient in a 1.5 T scanner.
IV. It is not safe to scan this patient. A. I,II,III B. IV C. II D. II, III Correct Answers C. II A pair of saddle electromagnetic coils located on the right and left and anterior and posterior of the patient, which produce strong magnetic fields from left to right and posterior and anterior. Correct Answers Golay Coil A patient comes down from the unit as an in-patient. The patient went to radiography to have a chest x-ray before coming to MRI. She needs to have a cervical MRI for severe pain. It is suspected that she may have a herniated disc. She checked to pacemaker, dentures and tattoos. You are scanning the patient's cervical spine in a 3.0T unit, with a receive only coil. What do you do next? A. Cancel the exam B. Review the x-ray with the radiologist C. Order an abdomen x-ray D. Scan the patient on a 1.5T unit. Correct Answers B. Review the x-ray with the radiologist. A patient is being scanned with braces, which of the following is true? A. The risk for a burn is highly likley. B. The static magnetic field will produce enough translational and rotational force to cause harm to the patient. C. A significant artifact may be seen.
A type of burn caused when the patients skin is found in the near field is called what? A. Loop burn B. Reflective C. Resonant D. Proximity Correct Answers D. Proximity A Variable RF pulse that will tilt hydrogen away from the longitudinal axis less than 90 degrees. Correct Answers Flip Angle A weakly repulsive force when placed in a strong static magnetic field. Correct Answers Diamagnetism A weekly attractive force when placed in a static magnetic field. Correct Answers Paramagnetic All linear gadolinium agents have shown to demonstrate the same amount of T1 shortenting in the brain? A. True B. False Correct Answers B. False All loop recorders are unsafe in the MR environment. A. True B. False Correct Answers B. False An implant has a deflection of 23 degrees. In terms of static magnetic fields, is it safe for this patient to have an MRI? A. Yes B. Must call the manufacture to determine conditions. C. No
D. Not enough information. Correct Answers A. Yes An implant is identified on an MR screening sheet. No radiographs or operative reports are available. What should be done? I. Obtain as much information about the patient implant as possible. II. Identify as many risks to the patient as possible by undergoing an MR exam (Static magnetic field risk, RF risk, etc.) III. Identify what we are scanning and diagnosis. IV. Have the radiologist make a benefit vs risk assessment for the patient to undergo an MR exam. A. I,II,III,IV B. I, II, IV C. II, III, IV D. IV Correct Answers A. I, II, III, IV An implant is located outside the gantry. Is there significant heating in this implant when scanning in normal mode? A. Yes B. No Correct Answers B. No An individual magnetic field produced by each hydrogen proton. Correct Answers Magnetic Moment An object that retains its magnetic field when exiting the static magnetic field is call what? A. Paramagnetic B. Diamagnetic C. Ferromagnetic
B. Use a cold compress to reduce heating. C. Move as quickly as possible to get the patient out of the scanner quickly. D. Advance patient into the scanner slowly. Correct Answers D. Advance Patient into the scanner slowly. How do magnetic flux lines travel? A. North to South B. South to North C. East to West D. West to East Correct Answers A North to South How does gadolinium contrast get into a patient if they never received a contrast media? A. They could have breathed it. B. They could have ingested it. C. They could have had a dose of gadolinium when they were sleeping. D. It is impossible to have gadolinium contrast in a patient unless it has been injected. Correct Answers B. They could have ingested it. How many mT are in 100 G? A. 10 mT B. 1000 mT C. 10,000 mT D. 1 mT Correct Answers A. 10 mT If a patient with a GFR of 15 has an MR ankle scan ordered with and without contrast and the technologist administers the contrast as ordered, who is at fault in the eyes of the court?
A. Technologist B. Radiologist C. Ordering physician D. Patient Correct Answers B. Radiologist If evaluating for focal nodular hyperplasia, what type of contrast agent would we most likely want to use? A. Hepatobilliary contrast B. Extracellular contrast C. Blood pool D. Non of the choices. Correct Answers A. Hepatobilliary contrast If the slope of the gradient coils increases, which of the following will worsen? A. Patient heating B. Magnetohydrodynamic effect C. Peripheral nerve stimulation D. All of the Above Correct Answers C. Peripheral nerve stimulation If we placed a small ferrous object at isocenter, what would we expect to happen? A. The object would experience no attraction. B. The object would immediately be attracted to the bore. C. The object would levitate. D. The object would be repulsed by the unit. Correct Answers A. The object would experience no attraction.
Patient 1 received contrast A and B. Patient 2 received only contrast A. After the patients received these contrast agents, it was suspected that contrast A was liked to NSF. Which patient would yield unconfounded results to prove this? A. Patient 1 B. Patient 2 Correct Answers B. Patient 2 Rotational force will be the strongest at what location? A. Isocenter B. Outside the MR room C. At the gantry opening D. At the 5 gauss line Correct Answers A. Isocenter Slew rate is measured in what? A. T/m/s B. mT C. Seconds D. Watts/kg Correct Answers A. T/m/s Sternal wires are unsafe to scan in MRI. A. True B. False Correct Answers B. False Term used to describe the gradient activation in data acquisition. This can be described as the slice selection gradient, phase encoding gradient frequency encoding gradient. Correct Answers Logical Gradient The ACR guidance policy of 2013 does what? A. Defines MR personnel.
B. Defines MR Safety regulations. C. Defines chain of command when dealing with MR safety situations. D. All of the choices. Correct Answers D. All of the choices. The amount of attraction an object has to the static magnetic field. Correct Answers Deflection The amount of energy used to move hydrogen 180 degrees. This is used in a spin echo sequence to regain phase coherency. Correct Answers 180 Degree RF The amount of energy used to tilt hydrogen from longitudinal magnetism into the transverse axis. Correct Answers 90 degree RF The amount of time that the gradient coils can remain active. Correct Answers Duty Cycle The amount of waveforms in a second. Correct Answers Hertz The area in our gantry furthest from the RF Transmitter. Correct Answers Far Field The area in the gantry which is closest to the RF transmitter. Correct Answers Near Field The attractive force of an object as it translates through the static gradient magnetic field. Correct Answers Translation Force
The equation used to identify the center frequency at a specific static magnetic field strength. Precessional frequency=gyromagnetic ratio*B0. Correct Answers Larmor Equation The FDA performs research and testing. A. True B. False Correct Answers B. False The force which is exerted by a magnetic field on a moving electric charge. The torque caused on the MR gantry as the gradient coils are activated. This produces the noises heard in MRI. Correct Answers Lorenz Force The gradient of magnetic densities that move from the north pole of the static magnetic field to the south pole. Correct Answers Flux lines The greatest chance of a burn to a patient comes from which of the following? A. Static magnetic field. B. Time-varying gradient magnetic field. C. Time-varying radiofrequency field. Correct Answers C. Time-varying radiofrequency field. The increasing strength of magnetism as we move closer to the MR unit is called what? A. Ferromagnetism B. Spatial magnetic gradient field C. Vector D. B0 Correct Answers B. Spatial magnetic gradient field
The largest amplitude witnessed. Correct Answers Maximum Gradient Field The magnetic field that aligns hydrogen nuclei parallel or anti- parallel. Correct Answers Static Magnetic Field The magnetic field that extends outside the MR unit. Correct Answers Fringe Field The Main focus of the ICNIRP in MRI is what? A. Radiation dose. B. Occupational dose. Correct Answers B. Occupational dose. The overall magnetic field strength of the MR unit. Correct Answers Magnetic Field Strength The patient gets nausea immediately after injection and it passes after 30 seconds. This is an example of what? A. Non-allergic reaction B. Allergic reaction C. Anaphylaxis D. Moderate reaction Correct Answers A. Non-allergic reaction The period of time after an excitation pulse where magnetism is lost in the transverse axis. Correct Answers Transverse Decay The period of time after an excitation pulse where magnetism returns to equilibrium. Correct Answers Longitudinal Recovery
The spatial gradient of 1.5 T MR unit, not the maximum spatial gradient has a lower spatial gradient than a 3.0 T MR unit. A. True B. False Correct Answers B. False The spectrum of frequencies that identify the amount and form of energy found at specific frequencies. Correct Answers Electromagnetic spectrum The speed at which the gradient coils can change the gradient magnetic fields. Correct Answers Slew Rate The term used to describe the spatial encoding of the gradient coils. X gradient produces sagittal images, Y gradient produces coronal images and z gradient produces axial images. Correct Answers Physical Gradient The unit of measurement used to describe the static magnetic field. Correct Answers Tesla The unit used to describe the static magnetic field. Correct Answers B sub 0 The unit used to describe the time-varying RF magnetic field. Correct Answers B sub 1 The use of a 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. Correct Answers Active Shielding
The use of magnetically conductive materials in an MR unit to reduce the fringe field. Correct Answers Passive Shielding The wobbling motion that hydrogen nuclei demonstrate. Correct Answers Precession The X coil will produce what plane of image? A. Coronal images B. Axial images C. Sagittal images D. Oblique images Correct Answers C. Sagittal images This describes how electrical currents are produced in the presence of alternating magnetic fields. Correct Answers Faraday's Law of induction This describes how electrical currents are produced in the presence of alternating magnetic fields. Correct Answers Faradays Law of Induction This is a burning where RF is reflected back to the patient producing burning. Correct Answers Reflective Burns This is a mode reserved for research or for testing where the SAR can operate above the maximum regulated limit. Correct Answers Second Controlled Mode This is a mode where the maximum regulated limit of SAR is allowed during acquisition. This is limited to 4W/kg for the whole body. Correct Answers First Controlled Mode
This is used to measure the amount of patient heating produced in a patient during acquisition. It is measured in Watts/kg. Correct Answers Specific Absorption Rate Uncontrollable movement of the eyes when exposed to a changing magnetic field. This is caused by nerve stimulation described by Faraday's law of induction. Correct Answers Nystagmus Using a fan to cool a patient is an example of which of the following? A. Conduction B. Evaporation C. Radiation D. Convection Correct Answers D. Convection Visually seeing flashing light when exposed to a changing magnetic field. This is caused by nerve stimulation described by Faraday's law of induction. Correct Answers Magnetophosphenes We would find a patient changing into a gown in what zone? A. Zone I B. Zone II C. Zone III D. Zone IV Correct Answers B. Zone II What contrast group would we avoid when a patient with a GFR less than 15 needs gadolinium contrast. A. Group 1 B. Group 2
C. Group 3 Correct Answers A. Group 1 What direction is the vector of a permanent MR unit? A. Horizontal B. Vertical C. Diagonal D. Variable Correct Answers B. Vertical What does gadolinium contrast media do to tissues in a patient? A. Shortens the T1 and PD time of tissues. B. Lengthens the T1 and T2 times of tissues. C. Shortens the T1 and T2 times of tissues. D. Lengthens the T1 times and shortens the T2 times. Correct Answers C. Shortens the T1 and T2 times of tissues. What does increasing the echo spacing mean? A. Increasing the distance between excitation pulses. B. Increasing the distance between the signals collected. C. Increasing the distance between slices. D. Factoring in the distance between patient thickness. Correct Answers B. Increasing the distance between the signals collected. What is responsible for attracting ferrous objects into the MR unit? A. Spatial magnetic gradient fields B. Strong uniform magnetic fields C. Gradient coils D. Radiofrequency system Correct Answers A. Spatial magnetic gradient fields
