MRI Physics Flashcards
What does the effect known as the “magnetic he modena mic effect” result in?
Elevated T wave, as a conductive medium (e.g. blood) moves across the magnetic filed.
Passive shielding can be achieved by lining the exam room with?
Steel
The duty cycle is?
The time the gradients area on during a TR period.
The gradient rise time is?
The time it takes for a gradient to get to full amplitude.
The imaging sequence that is of most concern for the time varying magnetic field effects is?
Echo planar imaging.
The strength of the gradient magnetic field is measured in?
Field strength over distance (m/Tm or G/cm)
TVMF effects are a greater concern for which scan?
EPI
RF heating is more of a concern in what imaging sequence?
Fast spin echo
RF antenna effects can cause what three things?
Interference artifacts, thermal injury and flames
