MR Registry Prep 2e |QUESTIONS AND ANSWERS| LATEST UPDATE

MR Registry Prep 2e |QUESTIONS AND
ANSWERS| LATEST UPDATE

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Terms in this set (180)



The external, or static, magnetic field b. B0
is annotated as ________.
a. B1
b. B0
c. Z
d. B


A field strength of 1.5 Tesla is d.15,000 G
equivalent to _______.
a. 10,000 G
b. 20,000 G
c. 15,000 mT
d.15,000 G


Which of the following systems b. Permanent
utilizes technology to create a
magnetic field that cannot be
removed (turned-off)?
a. Resistive
b. Permanent
c. Superconductive

,Which of the following systems a. Resistive
utilizes technology to create a
magnetic field that can easily and
routinely be removed (turned-off)?
a. Resistive
b. Permanent
c. Superconductive


Reducing the temperature of a b. resistance
conductor reduces _______.
a. current
b. resistance
c. voltage
d. conductor life


The cryogen most commonly used to a. Helium
maintain the magnet coils at a
superconducting temperature is
__________.
a. Helium
b. Hydrogen
c. Oxygen
d. Xenon


The sudden loss of superconductivity b. quench
and thus a loss of the magnetic field
in a superconducting magnet is
known as a __________.
a. steady state
b. quench
c. ramp down

, Which of the following technology is c. Superconductive
utilized to obtain very high magnetic
fields?
a. Resistive
b. Permanent
c. Superconductive


In a cylindrical magnet, the direction c. Z
of the magnetic field is oriented
along which axis of the patients
body?
a. X
b. Y
c. Z


Which of the following materials is b. iron
commonly used for passive magnetic
shielding within the walls of the MRI
room?
a. copper
b. iron
c. bismuth
d. lead


For adults, what is the current FDA a. 8 Tesla
guideline limit for exposure to a
magnetic field?
a. 8 Tesla
b. 4 Tesla
c. 3 Tesla
d. 7 Tesla