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MRSO - RADIO FREQUENCY - MODULE 4 Questions & Correct Revised Verified Answers
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MRSO - RADIO FREQUENCY - MODULE 4 Questions & Correct Revised Verified Answers
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MRSO - RADIO FREQUENCY - MODULE 4Questions & Correct Revised Verified Answers
First Level Controlled: One or more outputs reach a value that can cause
physiologic stress to patients which needs to be controlled by medical supervision
Operating mode outputs refer to: - Answer -Switched Gradients (db/dt)
-radiofrequency field (B1)
Whole Body SAR per operating mode (6 min): - Answer Normal: 2 W/kg
1st Level: 4 W/kg
2nd Level: >4 W/kg
Partial Body SAR per operating mode (6 min): - Answer Normal: 2-10 W/kg
1st Level: 4-10 W/kg
2nd Level: >(4-10) W/kg
Head SAR per operating mode (6 min): - Answer Normal: 3.2 W/kg
1st Level: 3.2 W/kg
2nd Level: >3.2 W/kg
2nd Level Controlled Mode - Answer -research mode
-can not be used currently, clinically
1st Level Controlled Mode - Answer -physiological stress is
possible -medical supervision/monitoring should be used
, -user acknowledgment required
-advisable to use normal mode or 2W/kg for whole body SAR as much as possible
Patient's ability to dissipate heat can be affected by: - Answer -bore temperature
-ambient temperature of the room
-relative humidity
-air flow rate
-prespiration
-blood flow
Purpose of RF (B1) field - Answer excite hydrogen protons
RF energy is absorbed by tissues - Answer within the volume of the RF transmit coil. This
is a thermogenic process.
Thermogenic process - Answer Results in production of heat. Ex: RF energy absorption
MRI local and whole-body tissue heating is due to - Answer magnetic induction
Types of RF coil designs - Answer -linearly
polarized -circularly polarized (quadrature)
Function of coils - Answer -transmit only
-receive only
-transmit/receive
Most common type of coil used - Answer receive only
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