MRI Basics Flashcards
The liquid helium used in MRI is a type of:
CryoGEN
Superconductive magnets use a ______ to hold liquid helium.
CryoSTAT
MRI- related accidents are:
rarely reported
Of the 3 magnet types used in MRI, which can be routinely turned on and off?
Resistive
What is the summation of all the magnetic moments of individual spins along the same plane as the magnetic field is referred to as?
Longitudinal Magnetization Vector
Zone III is which area?
Patient Holding area
True/False
Hearing aids are okay to be worn in the magnet room.
False
True/False
A cardiac pacemaker is always a contraindication of having an MRI scan.
False
At minimum, a patient should be screened at least ___ times before entering the magnetic room. The 1st screening is done by _________.
3 times.
1st screening done by referring physician.
Anyone entering the magnet room must be screened by:
a qualified MRI Professional.
In case of sudden release of gaseous helium into the amgnet room, what is the FIRST action the technologist should take?
Remove the patient from the bore & magnet room.
A release of helium into the magnet room can lead to death caused by what?
asphyxiation
A quench is always:
Uncontrolled or controlled
An explosive conversion of liquid helium to gaseous helium is called a:
Quench
Helium liquifies at -453° or _______
4° K
As the distance of an object to the magnet decreases, the force exerted on the object _______
increases
the amount of force a magnet exerts on an object depends on the:
amount of ferrous material on the object and the distance to the center of the magnet.
When used properly, MRI has NO:
adverse biological effects
10,000 Guass is equivalent to:
1.0 Tesla
In the absence of a magnetic field, the orientation or “spins” of hydrogen protons are all:
random
Of the 3 magnet types used in MRI, which is the one used the most?
Superconductive
True/False:
The magnetic field strength of an MRI system can be determined by looking at its size
False
As magnetic field strength increases, the number of protons that align in the parallel direction of the magnetic field vs. the anti-parallel direction:
Increases.
