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MRSO RADIO FREQUENCY MODULE 4 QUESTIONS AND ANSWERS $9.00   Add to cart

Exam (elaborations)

MRSO RADIO FREQUENCY MODULE 4 QUESTIONS AND ANSWERS

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MRSO RADIO FREQUENCY MODULE 4 QUESTIONS AND ANSWERS

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  • September 24, 2024
  • 103
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • mrso
  • MRSO
  • MRSO
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91 Multiple choice questions

Term 1 of 91
Over half of reports of patient injuries are the result of

UNRELATED to SAR or SED

Patients can and have been burned at low SAR values

RF-related burns

Mostly conductive materials followed by bore contact

can differ significantly at different field strengths

UNRELATED to SAR... although the higher the SAR, the more profound the
consequences

Term 2 of 91
SAR is the

ABSORPTION of RF into the body/tissues

body part and tissue


each vendor uses different algorithm


RATE of RF exposure and absorption

,Term 3 of 91
How patient dissipates RF power

cooling.


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

Normal: 2-10 W/kg
1st Level: 4-10 W/kg
2nd Level: >(4-10) W/kg

Normal: 3.2 W/kg
1st Level: 3.2 W/kg
2nd Level: >3.2 W/kg

within the volume of the RF transmit coil. This is a thermogenic process.

Term 4 of 91
Head SAR per operating mode (6 min):

UNRELATED to SAR... although the higher the SAR, the more profound the
consequences

iron oxide-based ink

(not enough information regarding neon tattoos)


Normal: 3.2 W/kg
1st Level: 3.2 W/kg
2nd Level: >3.2 W/kg

Normal: 2 W/kg
1st Level: 4 W/kg
2nd Level: >4 W/kg

,Term 5 of 91
Burns from conductive metals

-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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