AGR324 Exam 4: MRI & Nuclear Medicine With Questions And
Answers Latest Update 2026
Ch. 13: What does MRI stand for? - (answer)Magnetic resonance imaging
What is used to obtain an MRI scan? (think physics) - (answer)A magnetic field and radiofrequencies are
used to
determine the chemical make-up of a substance
Which imaging modality is better to look at soft tissue: CT or MRI? - (answer)MRI- Demonstrates the
concentration of free-floating
hydrogen molecules so has better contrast than CT
or radiography
What all can be imaged with MRI? - (answer)brain, spinal cord, soft tissue
Can you go in an MRI machine if you have a pacemaker? - (answer)NO
What is the most dangerous aspect of an MRI? - (answer)the extremely strong magnet- Projectile affect
What is precession? - (answer)how much an atom wobbles
What are some naturally occurring magnetic materials? - (answer)iron, malachite
How can we create a magnet? - (answer)• Can be induced by exposing some metallic objects to a strong
magnetic field.
• Can be created by applying an electrical current through copper windings
What units are used to measure magnetic strength? - (answer)-Gauss (G): imperial unit of magnetism
-Tesla (T): metric unit of magnetism
, AGR324 Exam 4: MRI & Nuclear Medicine With Questions And
Answers Latest Update 2026
Which unit is used to describe medical magnets? - (answer)Tesla (T)
What are the 3 types of medical MRI magnets? - (answer)• Permanent magnets
-2 slabs of magnetic material facing each other
-<0.3T
• Electromagnets (resistive magnets)
-Electrical charge applied through copper wire
-<-.6T
• Superconducting magnets
-Most common
-Large electromagnets that are superconductive in very low temperatures
->/= 1T
-Never turned off!
What is used to keep a superconducting magnet active? - (answer)Liquid helium used to keep the
magnet active
Which of the 3 types of medical magnets is the strongest? - (answer)Superconducting magnet
What is the MRI room surrounded by and why is this necessary? - (answer)Faraday cage- specialized,
continuous conductive shielding—typically copper, aluminum, or galvanized steel panels—that encases
the entire room, including the walls, floor, and ceiling.
Blocks external radiowaves and contains magnetic field produced by machine
Answers Latest Update 2026
Ch. 13: What does MRI stand for? - (answer)Magnetic resonance imaging
What is used to obtain an MRI scan? (think physics) - (answer)A magnetic field and radiofrequencies are
used to
determine the chemical make-up of a substance
Which imaging modality is better to look at soft tissue: CT or MRI? - (answer)MRI- Demonstrates the
concentration of free-floating
hydrogen molecules so has better contrast than CT
or radiography
What all can be imaged with MRI? - (answer)brain, spinal cord, soft tissue
Can you go in an MRI machine if you have a pacemaker? - (answer)NO
What is the most dangerous aspect of an MRI? - (answer)the extremely strong magnet- Projectile affect
What is precession? - (answer)how much an atom wobbles
What are some naturally occurring magnetic materials? - (answer)iron, malachite
How can we create a magnet? - (answer)• Can be induced by exposing some metallic objects to a strong
magnetic field.
• Can be created by applying an electrical current through copper windings
What units are used to measure magnetic strength? - (answer)-Gauss (G): imperial unit of magnetism
-Tesla (T): metric unit of magnetism
, AGR324 Exam 4: MRI & Nuclear Medicine With Questions And
Answers Latest Update 2026
Which unit is used to describe medical magnets? - (answer)Tesla (T)
What are the 3 types of medical MRI magnets? - (answer)• Permanent magnets
-2 slabs of magnetic material facing each other
-<0.3T
• Electromagnets (resistive magnets)
-Electrical charge applied through copper wire
-<-.6T
• Superconducting magnets
-Most common
-Large electromagnets that are superconductive in very low temperatures
->/= 1T
-Never turned off!
What is used to keep a superconducting magnet active? - (answer)Liquid helium used to keep the
magnet active
Which of the 3 types of medical magnets is the strongest? - (answer)Superconducting magnet
What is the MRI room surrounded by and why is this necessary? - (answer)Faraday cage- specialized,
continuous conductive shielding—typically copper, aluminum, or galvanized steel panels—that encases
the entire room, including the walls, floor, and ceiling.
Blocks external radiowaves and contains magnetic field produced by machine
