hardware

Question 1

consistent room tem of 65*75 degree f, humidity of 50-70% and sufficient air flow in the mr scan room is recommended to

Answer 1

make patients less vulnerable to the RF heating effects

Question 2

the liquid cryogens are cooled in a superconducting magnet at a temperature of

Answer 2

4 degree K

Question 3

during q quench of the mr system, pts and employees should be evacuated from the scan room to avoid

Answer 3

asphyziation, frostbite and tympanic membranes damage

Question 4

the intensity limit for a static magnetic field in clinical use is limited by the food and drug administration to

Answer 4

4 T

Question 5

Radiofrequency shielding can be achieved by lining the scanner room walls with

Answer 5

copper

Question 6

the location of the coils installed in the MRI scanner from the inner point to the outer most edge are

Answer 6

radiofrequency coils, gradient coils. shim coils, main magnet

Question 7

the coils construction in an MR system from the innermost aspect to the outer

Answer 7

radiofrequency, gradient. shim. main magnet

Question 8

doubling the magnetic field strength will

Answer 8

yield an increase of double the SNR

Question 9

passive shielding can be accomplished by lining the mr room with

Answer 9

steel

Question 10

active shielding can be defined as

Answer 10

superconducting windings within the mr scanner reducing the fringe magnetic field

Question 11

_____ could be used to line the walls and or floors of the mr magnet room to reduce the fringe field and is defined as______ shielding

Answer 11

steel; passive

Question 12

____would be used to contain the RF in an MR magnet room

Answer 12

copper