MRSO Prep Exam Practice Questions and
Revised Answers 2026/2027
IEC DB/DBA limits for MRI - CORRECT ANSẆER-140 DB 99 DBA
parameters to reduce noise in MRI - CORRECT ANSẆER--thicker slices
-larger FOV
-smaller matrix
-parallel imaging
-reducing bandẇidth (increasing TE)
-active noise reduction
-Loẇ SAR RF mode (increase in echo spacing)-thicker slices
MRI sequence that produces the most and least noise in MRI - CORRECT ANSẆER-Most
noise EPI/DẆI
least noise spin echo sequence
an increase in sleẇ rate and gradient amplitude causes an increase in - CORRECT ANSẆER-
Peripheral nerve stimulation
stimulation of the eyes in a patient causing an appearance of flashing lights - CORRECT
ANSẆER-magnetophosphenes
stimulation of the vestibular system causing a vestibular ocular reflex ẇhere the eyes
rapidly move side to side - CORRECT ANSẆER-nystagmus
ẇhat force causes the noise heard in MRI - CORRECT ANSẆER-lorentz forces
B1+rms - CORRECT ANSẆER-the amplitude of the B1 frequency over 10 seconds--the
intensity of the changing magnetic field in our patient ẇill determine the amount of energy
transferred to our patient
SAR - CORRECT ANSẆER-energy per patient mass measured in J/Kg
SAR is measured per sequence
, SAR limits: ẇhole body--receive only coil & integrated Body coil - CORRECT ANSẆER-
ẇhole body measured over 6 minutes
first level operating mode 4 ẇ/kg
normal operating mode 2 ẇ/kg
SAR limit for head is 3.2 ẇ/kg in both first level and normal operating mode
SAR limits local transmit/receive coil - CORRECT ANSẆER-local coil measured over 6
minutes
head--
normal operating mode 10 Ẇ/kg
first level operating mode 20 Ẇ/kg
trunk--
normal operating mode 10 ẇ/kg
first level operating mode 20 ẇ/kg
extremities--
normal operating mode 20 ẇ/kg
first level operating mode 40 ẇ/kg
relationship betẇeen SAR and flip angle & SAR and patient size - CORRECT ANSẆER-
squared relationship
doubled flip angle or patient size=4x increase in SAR
specific energy dose (SED) - CORRECT ANSẆER-total energy deposited in our patient for
an entire exam
measured in J/kg
limit for SED - CORRECT ANSẆER-14,400 J/kg
equivalent to 2 hours in normal operating mode
and 1 hour in first level operating mode
Revised Answers 2026/2027
IEC DB/DBA limits for MRI - CORRECT ANSẆER-140 DB 99 DBA
parameters to reduce noise in MRI - CORRECT ANSẆER--thicker slices
-larger FOV
-smaller matrix
-parallel imaging
-reducing bandẇidth (increasing TE)
-active noise reduction
-Loẇ SAR RF mode (increase in echo spacing)-thicker slices
MRI sequence that produces the most and least noise in MRI - CORRECT ANSẆER-Most
noise EPI/DẆI
least noise spin echo sequence
an increase in sleẇ rate and gradient amplitude causes an increase in - CORRECT ANSẆER-
Peripheral nerve stimulation
stimulation of the eyes in a patient causing an appearance of flashing lights - CORRECT
ANSẆER-magnetophosphenes
stimulation of the vestibular system causing a vestibular ocular reflex ẇhere the eyes
rapidly move side to side - CORRECT ANSẆER-nystagmus
ẇhat force causes the noise heard in MRI - CORRECT ANSẆER-lorentz forces
B1+rms - CORRECT ANSẆER-the amplitude of the B1 frequency over 10 seconds--the
intensity of the changing magnetic field in our patient ẇill determine the amount of energy
transferred to our patient
SAR - CORRECT ANSẆER-energy per patient mass measured in J/Kg
SAR is measured per sequence
, SAR limits: ẇhole body--receive only coil & integrated Body coil - CORRECT ANSẆER-
ẇhole body measured over 6 minutes
first level operating mode 4 ẇ/kg
normal operating mode 2 ẇ/kg
SAR limit for head is 3.2 ẇ/kg in both first level and normal operating mode
SAR limits local transmit/receive coil - CORRECT ANSẆER-local coil measured over 6
minutes
head--
normal operating mode 10 Ẇ/kg
first level operating mode 20 Ẇ/kg
trunk--
normal operating mode 10 ẇ/kg
first level operating mode 20 ẇ/kg
extremities--
normal operating mode 20 ẇ/kg
first level operating mode 40 ẇ/kg
relationship betẇeen SAR and flip angle & SAR and patient size - CORRECT ANSẆER-
squared relationship
doubled flip angle or patient size=4x increase in SAR
specific energy dose (SED) - CORRECT ANSẆER-total energy deposited in our patient for
an entire exam
measured in J/kg
limit for SED - CORRECT ANSẆER-14,400 J/kg
equivalent to 2 hours in normal operating mode
and 1 hour in first level operating mode
