AGR324 EXAM 4: MRI & NUCLEAR
MEDICINE QUESTIONS AND ANSWERS
100% PASS
Ch. 13: What does MRI stand for? - ANS Magnetic resonance imaging
What is used to obtain an MRI scan? (think physics) - ANS 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? - ANS MRI- Demonstrates
the concentration of free-floating
hydrogen molecules so has better contrast than CT
or radiography
What all can be imaged with MRI? - ANS brain, spinal cord, soft tissue
Can you go in an MRI machine if you have a pacemaker? - ANS NO
What is the most dangerous aspect of an MRI? - ANS the extremely strong magnet- Projectile
affect
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, What is precession? - ANS how much an atom wobbles
What are some naturally occurring magnetic materials? - ANS iron, malachite
How can we create a magnet? - ANS • 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? - ANS -Gauss (G): imperial unit of
magnetism
-Tesla (T): metric unit of magnetism
Which unit is used to describe medical magnets? - ANS Tesla (T)
What are the 3 types of medical MRI magnets? - ANS • 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
@COPYRIGHT ALL RIGHTS RESERVED PAGE 2 OF 7
MEDICINE QUESTIONS AND ANSWERS
100% PASS
Ch. 13: What does MRI stand for? - ANS Magnetic resonance imaging
What is used to obtain an MRI scan? (think physics) - ANS 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? - ANS MRI- Demonstrates
the concentration of free-floating
hydrogen molecules so has better contrast than CT
or radiography
What all can be imaged with MRI? - ANS brain, spinal cord, soft tissue
Can you go in an MRI machine if you have a pacemaker? - ANS NO
What is the most dangerous aspect of an MRI? - ANS the extremely strong magnet- Projectile
affect
@COPYRIGHT ALL RIGHTS RESERVED PAGE 1 OF 7
, What is precession? - ANS how much an atom wobbles
What are some naturally occurring magnetic materials? - ANS iron, malachite
How can we create a magnet? - ANS • 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? - ANS -Gauss (G): imperial unit of
magnetism
-Tesla (T): metric unit of magnetism
Which unit is used to describe medical magnets? - ANS Tesla (T)
What are the 3 types of medical MRI magnets? - ANS • 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
@COPYRIGHT ALL RIGHTS RESERVED PAGE 2 OF 7
