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MRSO - RADIO FREQUENCY - MODULE 4 Questions & Correct Revised Verified Answers $12.99
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MRSO - RADIO FREQUENCY - MODULE 4 Questions & Correct Revised Verified Answers
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When determining RF energy, strength of magnetic field is measured in - Answer mT Main biological effect of exposing tissue to electromagnetic radiation in that frequency range - Answer tissue heating Cause of tissue heating - Answer Magnetic induction results in eddy currents of conductive tis...

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  • August 30, 2024
  • 13
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • mrso radio frequency module 4 questions corr

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MRSO - RADIO FREQUENCY - MODULE 4
Questions & Correct Revised Verified Answers
When determining RF energy, strength of magnetic field is measured in - Answer mT


Main biological effect of exposing tissue to electromagnetic radiation in that frequency
range - Answer tissue heating


Cause of tissue heating - Answer Magnetic induction results in eddy currents of
conductive tissue


Tissue heating is mostly ______________ with very little _______________ - Answer
peripheral , deep body heating


How patient dissipates RF power - Answer cooling.


If the input is greater than the output, heating occurs.


SAR (specific absorption rate) - Answer RF power absorbed per unit mass of tissue


SAR is SPECIFIC to: - Answer body part and tissue


SAR represents - Answer ABSORPTION of RF into the body/tissues


SAR is the - Answer RATE of RF exposure and absorption


SAR is measured in - Answer watts/kg

, SAR is proportional to: - Answer -the power of 2 for system's resonant frequency (factor
of 4)
-the power of 2 for B1 amplitude of RF field (doubling flip angle with increase SAR by
factor of 4)
-the power of 5 for the pt's circumference
-patient's average conductivity


Is muscle or fat more conductive? - Answer muscle


SAR is not measured, it is: - Answer estimated via algorithms that differ with MR
manufacturer


There is no standard for SAR estimations - Answer each vendor uses different algorithm


Estimations of SAR are based on: - Answer -field strength
-RF frequency / coil
-scan parameters: type, # RF pulses, TR, # of slices per TR
-pt characteristics: weight, height, body part
-assumed tissue conductivity


It is widely accepted that most if not all vendors are very
___________________________ in their SAR estimates - Answer conservative


SAR is believed to serve as a - Answer crude measure of heating potential

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