1 | P a g e | © copyright 2024/2025 | Grade A+
MRSO - RADIO FREQUENCY - MODULE 4
Questions & 100% Correct Answers
Purpose of RF (B1) field
✓ ~~> excite hydrogen protons
RF energy is absorbed by tissues
✓ ~~> within the volume of the RF transmit coil. This is a thermogenic
process.
Thermogenic process
✓ ~~> Results in production of heat. Ex: RF energy absorption
MRI local and whole-body tissue heating is due to
✓ ~~> magnetic induction
Types of RF coil designs
✓ ~~> -linearly polarized
-circularly polarized (quadrature)
Function of coils
Master01 | September, 2024/2025 | Latest update
, 2 | P a g e | © copyright 2024/2025 | Grade A+
✓ ~~> -transmit only
-receive only
-transmit/receive
Most common type of coil used
✓ ~~> receive only
Integrated body coils are capable of functioning
✓ ~~> -as transmit/receive coil
-as transmit only coil
When receive only coil is used, RF energy is transmitted by
✓ ~~> the integrated body coil
Modern integrated body coils are
✓ ~~> circularly polarized
Quadrature mode
✓ ~~> -some 3T systems have option
-Advantage: dielectric shading reduction
Master01 | September, 2024/2025 | Latest update
, 3 | P a g e | © copyright 2024/2025 | Grade A+
-safety considerations with implants/devices
RF Power Distribution Maps
✓ ~~> -specific to vendor and transmit coil
-graph: horizontal axis represents z
-100% power is at isocenter (distance from isocenter should be identical on
each side)
-measured in cm
-used for vendor integrated transmit coil only, not transmit/receive head or
knee coil
Purpose of RF Power Distribution Map
✓ ~~> determine percentage of RF frequency power at a given location
within the volume of the radiofrequency transmit coil
-if metal item can not be removed, this map would be useful.
The further from isocenter, the _______ the RF power exposure
✓ ~~> less
Master01 | September, 2024/2025 | Latest update
MRSO - RADIO FREQUENCY - MODULE 4
Questions & 100% Correct Answers
Purpose of RF (B1) field
✓ ~~> excite hydrogen protons
RF energy is absorbed by tissues
✓ ~~> within the volume of the RF transmit coil. This is a thermogenic
process.
Thermogenic process
✓ ~~> Results in production of heat. Ex: RF energy absorption
MRI local and whole-body tissue heating is due to
✓ ~~> magnetic induction
Types of RF coil designs
✓ ~~> -linearly polarized
-circularly polarized (quadrature)
Function of coils
Master01 | September, 2024/2025 | Latest update
, 2 | P a g e | © copyright 2024/2025 | Grade A+
✓ ~~> -transmit only
-receive only
-transmit/receive
Most common type of coil used
✓ ~~> receive only
Integrated body coils are capable of functioning
✓ ~~> -as transmit/receive coil
-as transmit only coil
When receive only coil is used, RF energy is transmitted by
✓ ~~> the integrated body coil
Modern integrated body coils are
✓ ~~> circularly polarized
Quadrature mode
✓ ~~> -some 3T systems have option
-Advantage: dielectric shading reduction
Master01 | September, 2024/2025 | Latest update
, 3 | P a g e | © copyright 2024/2025 | Grade A+
-safety considerations with implants/devices
RF Power Distribution Maps
✓ ~~> -specific to vendor and transmit coil
-graph: horizontal axis represents z
-100% power is at isocenter (distance from isocenter should be identical on
each side)
-measured in cm
-used for vendor integrated transmit coil only, not transmit/receive head or
knee coil
Purpose of RF Power Distribution Map
✓ ~~> determine percentage of RF frequency power at a given location
within the volume of the radiofrequency transmit coil
-if metal item can not be removed, this map would be useful.
The further from isocenter, the _______ the RF power exposure
✓ ~~> less
Master01 | September, 2024/2025 | Latest update
