progressive quizzes Flashcards
1 T is equal to _____ gauss
10,000
in the event of a quench, the scan room should be evacuated to avoid
frostbite & asphyxiation
the amount of signal in an image divided by the amount of noise is called
SNR
how often should imaging coils be inspected for safety
every time you use them
the liquid helium used to cool the magnet’s coils has a temperature of
-452 degrees fahrenheit
the RF pulses used in MR are best considered to be
non-ionizing & low energy
5 Gauss is equivalent to ___ T
0.0005 T
how many pairs of gradients are there
3
T/F: a saturation pulse or band is placed either within or outside the FOV to reduce artifacts such as breathing motion
true
list the 3 magnetic states of material
ferrous
diamagnetic
paramagnetic
SAR is measured in
W/kg
RF irradiation is expressed as
SAR
gadolinium ions are considered to be
paramagnetic
gadolinium is best seen on what type of weighted image
T1
what sequence would best demonstrate MS plaques
T2 FLAIR
at isocenter the unit of magnetic strength is measured in
tesla
area outside of scanner is measured in
gauss
TR controls
T1 weighting
TE controls
T2 weighting
what is a good general range for a short TR on a 1.5 magnet
400-700
what imaging plane is best at demonstrating the achilles tendon
sagittal
how many gauss would be in a 7T magnet
70,000
which sequence would be best used to help diagnose avascular necrosis, a bone bruise, or an infection
STIR
which nerve is affected by carpal tunnel syndrome
median
an increased size in a coil, will ____ noise
increase
another name for the main magnetic field is
B0
a material that weakly repels a magnetic field with no measurable magnetic properties of its own is called
diamagnetic
which plane is useful for visualizing scoliosis of the spine
coronal
