MRSO 190 Exam Study Guide Questions with 100

MRSO 190 Exam Study Guide Questions with 100% Correct Answers 2024/2025 How do magnetic flux lines travel?

• North to South
• South to North
• East to West
• West to East - Correct Answers A North to South

Which of the following can be potential safety concerns to a patient in the static magnetic field?

• Electrically conductive materials
• Ferrous objects
• Magnetic objects
• All of the choices. - Correct Answers D. All of the choices

An object that retains its magnetic field when exiting the static magnetic field is call what?

• Paramagnetic
• Diamagnetic
• Ferromagnetic
• Superparamagnetic - Correct Answers C. Ferromagnetic

What direction is the vector of a permanent MR unit?

• Horizontal
• Vertical
• Diagonal
• Variable - Correct Answers B. Vertical

What separates a superconducting MR unit from a resistive MR unit?

• Cryogen
• Coils of wires
• Permanent magnets
• none of the choices - Correct Answers A. Cryogen 1 / 3

The increasing strength of magnetism as we move closer to the MR unit is called what?

• Ferromagnetism
• Spatial magnetic gradient field
• Vector
• B0 - Correct Answers B. Spatial magnetic gradient field

What is responsible for attracting ferrous objects into the MR unit?

• Spatial magnetic gradient fields
• Strong uniform magnetic fields
• Gradient coils
• Radiofrequency system - Correct Answers A. Spatial magnetic gradient fields

If we placed a small ferrous object at isocenter, what would we expect to happen?

• The object would experience no attraction.
• The object would immediately be attracted to the bore.
• The object would levitate.
• The object would be repulsed by the unit. - Correct Answers A. The object would experience no

attraction.Rotational force will be the strongest at what location?

• Isocenter
• Outside the MR room
• At the gantry opening
• At the 5 gauss line - Correct Answers A. Isocenter

Passive shielding uses which of the following?

• Coils of wires with electrical current running through them.
• Magnetically conductive materials
• Plastic
• Wood - Correct Answers B. Magnetically conductive materials 2 / 3

How can we reduce risks associated with Lenz's force?

• No risks are associated with Lenz's force.
• Use a cold compress to reduce heating.
• Move as quickly as possible to get the patient out of the scanner quickly.
• Advance patient into the scanner slowly. - Correct Answers D. Advance Patient into the scanner

slowly.An implant has a deflection of 23 degrees. In terms of static magnetic fields, is it safe for this patient to have an MRI?

• Yes
• Must call the manufacture to determine conditions.
• No
• Not enough information. - Correct Answers A. Yes

Which of the following stainless steels are non-ferrous?

• Ferritic
• Martensitic
• Austenitic
• All are ferrous - Correct Answers C. Austenitic

It is not safe for a patient to cross over the 5 gauss line. How many millitesla is this?

• 0.5mT
• 5mT
• 50mT
• 0.005mT - Correct Answers A. 0.5mT

A patient is placed in a magnetic field that changes over a distance from the MR unit. What do we need in order to meet the manufacture limits if a patient with an implant will be safe from the threats associated with the static magnetic field prior to their MRI.

• Spatial gradient map.
• Compression
• / 3