-field strength
-RF frequency / coil
-scan parameters: type, # RF pulses, TR, # of slices per TR
-pt characteristics: weight, height, body part
-assumed tissue conductivity
UNRELATED to SAR... although the higher the SAR, the more profound the
consequences
-no skin to skin contact
-do not create loops with coil cables
-have coil cables exit as close to center of bore as possible
-pad between coil cable and patient
-items with metallic backing (drug patches, space blanket)
-ekg electrodes
-fabrics containing metallic fibers (copper fibers, stump shrinker)
If within volume of transmit coil
Term 6 of 91
Elongated Conductors with high risk of heating at 1.5T:
differences in resonant wavelength.
(length of lead matches wavelength)
(wavelength longer at lower field strengths)
muscle
0.5-1.0 cm of padding
not sheet or blanket
25-30 cm
, Term 7 of 91
Purpose of RF (B1) field
tuning components
magnetic field and electric field
receive only
excite hydrogen protons
short bursts (pulses)
Term 8 of 91
Near-field burns
excite hydrogen protons
contact with bore wall
watts/kg
closest to patient inside bore behind thin cover
Term 9 of 91
Cause of tissue heating
-research mode
-can not be used currently, clinically
-transmit only
-receive only
-transmit/receive
Magnetic induction results in eddy currents of conductive tissue
magnetic induction
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