MRI Flashcards
MRI also known as ___
nuclear magnetic resonance imaging
father of MRI
Raymond Damadian
he won the nobel prize in physiology or medicine in 2003 for his contribution to the use of MRI in medical research and diagnostics
Paul C. Lauterbur
MRI is ideally suited for ___ ___ problems
soft tissue
zone that is freely accessible to public with minimal magnetic field exposure
zone 1 - general public
zone between zone 1 and more restricted zones, where patients are under general supervision and screening typically occurs
zone 2 - unscreened mri patients
zone that is restricted with physical barriers, where only screened personnel and patients are allowed and the MR control room is located
zone 3 - screened patients and personnel
room where the magnet is located, with the highest magnetic field exposure and strict access restrictions
zone 4 - screened mri patients under direct supervision of trained mri personnel
magnets field strength
imaging 0.2T to .
spectroscopy 2.0T to .
0.2T to 2.0T
2.0T to 7.0T
earth’s magnetic field
5 x 10^-5 Tesla
process whereby there is a sudden loss of absolute zero of temperature in the magnet coil so that they cease to be superconducting and become resistive thus eliminating magnetic field
quenching
when you should push emergency button?
uncontrollable fire in magnet room
life threatening accident
have a ring of magnets that forms an open hole or tube in the middle where you lie to get the images
closed bore mri
narrow with tight head to ceiling space that can cause anxiety and discomfort for some people but these mri machines take the best quality images
closed bore mri
has two flat magnets positioned over and under you with a large space between them for you to lie
open bore mri
generates the strong, static magnetic field necessary for mri
main magnet
these coils create variations in the magnetic field allowing for spatial encoding of the signals and precise localization of the tissue being imagined
gradient coils
these coils transmit radiowaves to excite the hydrogen atoms in the body and receive the signals emitted by the atoms which are then used to form images
radiofrequency coils
system that controls the entire image process including pulse sequences, data acquisition and image reconstruction
computer system
focuses on anatomy, showing fat and normal soft tissues as bright
T1 weighted
highlights fluid and abnormalities like tumors or inflammation
T2 weighted
similar to T2W, but suppresses CSF signal making it easier to see abnormalities
FLAIR
FLAIR
fluid attenuated inversion recovery
shows tissue water content, useful for evaluating some pathologies
proton density
