100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
MRSO - RADIO FREQUENCY - MODULE 4 Questions & Correct Revised Verified Answers $12.99   Add to cart

Exam (elaborations)

MRSO - RADIO FREQUENCY - MODULE 4 Questions & Correct Revised Verified Answers

 3 views  0 purchase
  • Course
  • MRSO
  • Institution
  • MRSO

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...

[Show more]

Preview 2 out of 13  pages

  • August 30, 2024
  • 13
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • MRSO
  • MRSO
avatar-seller
Examsplug
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

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller Examsplug. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $12.99. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

77254 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling
$12.99
  • (0)
  Add to cart