progressive quizzes

Question 1

1 T is equal to _____ gauss

Answer 1

10,000

Question 2

in the event of a quench, the scan room should be evacuated to avoid

Answer 2

frostbite & asphyxiation

Question 3

the amount of signal in an image divided by the amount of noise is called

Answer 3

SNR

Question 4

how often should imaging coils be inspected for safety

Answer 4

every time you use them

Question 5

the liquid helium used to cool the magnet’s coils has a temperature of

Answer 5

-452 degrees fahrenheit

Question 6

the RF pulses used in MR are best considered to be

Answer 6

non-ionizing & low energy

Question 7

5 Gauss is equivalent to ___ T

Answer 7

0.0005 T

Question 8

how many pairs of gradients are there

Answer 8

3

Question 9

T/F: a saturation pulse or band is placed either within or outside the FOV to reduce artifacts such as breathing motion

Answer 9

true

Question 10

list the 3 magnetic states of material

Answer 10

ferrous
diamagnetic
paramagnetic

Question 11

SAR is measured in

Answer 11

W/kg

Question 12

RF irradiation is expressed as

Answer 12

SAR

Question 13

gadolinium ions are considered to be

Answer 13

paramagnetic

Question 14

gadolinium is best seen on what type of weighted image

Answer 14

T1

Question 15

what sequence would best demonstrate MS plaques

Answer 15

T2 FLAIR

Question 16

at isocenter the unit of magnetic strength is measured in

Answer 16

tesla

Question 17

area outside of scanner is measured in

Answer 17

gauss

Question 18

TR controls

Answer 18

T1 weighting

Question 19

TE controls

Answer 19

T2 weighting

Question 20

what is a good general range for a short TR on a 1.5 magnet

Answer 20

400-700

Question 21

what imaging plane is best at demonstrating the achilles tendon

Answer 21

sagittal

Question 22

how many gauss would be in a 7T magnet

Answer 22

70,000

Question 23

which sequence would be best used to help diagnose avascular necrosis, a bone bruise, or an infection

Answer 23

STIR

Question 24

which nerve is affected by carpal tunnel syndrome

Answer 24

median

Question 25

an increased size in a coil, will ____ noise

Answer 25

increase

Question 26

another name for the main magnetic field is

Answer 26

B0

Question 27

a material that weakly repels a magnetic field with no measurable magnetic properties of its own is called

Answer 27

diamagnetic

Question 28

which plane is useful for visualizing scoliosis of the spine

Answer 28

coronal