2026 MRSE FINAL EXAMS ACTUAL QUESTIONS
AND ANSWERS SURE A+
✔✔What is the ASTM duration of time defined for heating effects? - ✔✔15 mins
continuous scanning
✔✔Where is translational force at a maximum? - ✔✔edge of bore
✔✔Where is translational force at a minimum? - ✔✔isocenter
✔✔Where is rotational force at a maximum? - ✔✔isocenter
✔✔Where are gradient fields at their maximum? - ✔✔inner periphery of bore
✔✔Do gradient fields extend outside the bore? - ✔✔yes
✔✔Do RF fields extend outside the bore? - ✔✔no
✔✔What kind of stainless steel is NOT ferritic? - ✔✔316L austenitic stainless steel
✔✔Cobalt is (paramagnetic/diamagnetic/ferromagnetic) - ✔✔ferromagnetic
,✔✔MP35N alloy is (ferrous/not ferrous) - ✔✔not ferrous
✔✔How much risk does a temporary epicardial pacing wire pose? - ✔✔minimal risk
because the wires are usually not ferrous and have a very short length that will not
create much heating
✔✔What is the minimum type and amount of padding to reduce a proximity or loop
burn? - ✔✔1 cm foam pad (thick enough, not impacted by sweat)
✔✔In which zones will a patient change for a fixed and mobile MRI? - ✔✔fixed: Zone 2.
mobile: Zone 3
✔✔Who is allowed to bring a patient into zone 4? - ✔✔Only level 2 MR personnel
✔✔Who is allowed to bring a patient into zone 3? - ✔✔Level 1 and 2 MR personnel
✔✔Force product formula - ✔✔Bo x gm [T^2/m], where Bo = static magnetic field and
gm = magnetic spatial gradient (dB/dx)
✔✔1 T = ____ G - ✔✔10,000 G
✔✔Maximum FDA static field strength for infant (<1 mo old) - ✔✔4 T
✔✔What is the resonance frequency for 1.5 T? - ✔✔64 MHz
✔✔What is the resonance frequency for 3 T? - ✔✔128 MHz
✔✔What is the resonance frequency for 7T? - ✔✔340 MHz
✔✔What is the resonant length at 1.5T? - ✔✔25 cm
✔✔What is the resonant length at 3T? - ✔✔13 cm
✔✔What is the resonant length at 7T? - ✔✔7 cm
✔✔What is the definition of MR Safe? - ✔✔non-magnetic, non-electrically conductive,
non-metallic
✔✔Patient heating is (linearly/quadratically/not) proportional to static field strength -
✔✔quadratically (requires higher RF frequencies to induce resonance, higher frequency
means more heating)
✔✔B1+rms is (linearly/quadratically/not) proportional to static field strength - ✔✔not
, ✔✔What are typical dose concentrations for gadolinium? - ✔✔500-1000 mM
✔✔What zone(s) are not "required" to have postings? - ✔✔Zone 1, Zone 2 (may not
exist)
✔✔ICNIRP limit for the general public - ✔✔400 mT
✔✔Would a control room ever be considered zone 4? - ✔✔No, but if the 5 gauss line
extends into it it could pose a hazard and require screening
✔✔Will an object that deflects 90 degrees 1 meter from isocenter on a 3T unit be safer
at 1.5T? - ✔✔not necessarily, due to magnetic saturation
✔✔Formula for translational force - ✔✔mg x tan(α), where mg = and α = deflection
angle
✔✔What is the boiling temperature of liquid helium? - ✔✔4.2 K
✔✔Current Density (J) formula - ✔✔J = ծ (E + v x B) where ծ = Electrical conductivity, B
= Magnetic flux density, v = Velocity, E = Electrical Field strength
✔✔During scanning, what area of the patient will experience heating? - ✔✔RF area of
exposure (slice not important)
✔✔IEC time-varying magnetic field limit - ✔✔3 T/s
✔✔What considerations should be given to a fetus in MRI scanning? - ✔✔hearing,
contrast, heating
✔✔As we move away from isocenter, the change in RF energy deposition falls off at a
factor of... - ✔✔10
✔✔What level of MR safety training at a minimum must an MR technologist have? -
✔✔Level 2
✔✔All patients who receive what kind of agent may have eGFR drawn per the ACR
Manual of Contrast Media v10.3? - ✔✔group 2
✔✔What is FPO:basic? - ✔✔A mode of operation defined by the IEC in which gradient
fields and RF heating are at an absolute minimum. Only applicable to 1.5 T
AND ANSWERS SURE A+
✔✔What is the ASTM duration of time defined for heating effects? - ✔✔15 mins
continuous scanning
✔✔Where is translational force at a maximum? - ✔✔edge of bore
✔✔Where is translational force at a minimum? - ✔✔isocenter
✔✔Where is rotational force at a maximum? - ✔✔isocenter
✔✔Where are gradient fields at their maximum? - ✔✔inner periphery of bore
✔✔Do gradient fields extend outside the bore? - ✔✔yes
✔✔Do RF fields extend outside the bore? - ✔✔no
✔✔What kind of stainless steel is NOT ferritic? - ✔✔316L austenitic stainless steel
✔✔Cobalt is (paramagnetic/diamagnetic/ferromagnetic) - ✔✔ferromagnetic
,✔✔MP35N alloy is (ferrous/not ferrous) - ✔✔not ferrous
✔✔How much risk does a temporary epicardial pacing wire pose? - ✔✔minimal risk
because the wires are usually not ferrous and have a very short length that will not
create much heating
✔✔What is the minimum type and amount of padding to reduce a proximity or loop
burn? - ✔✔1 cm foam pad (thick enough, not impacted by sweat)
✔✔In which zones will a patient change for a fixed and mobile MRI? - ✔✔fixed: Zone 2.
mobile: Zone 3
✔✔Who is allowed to bring a patient into zone 4? - ✔✔Only level 2 MR personnel
✔✔Who is allowed to bring a patient into zone 3? - ✔✔Level 1 and 2 MR personnel
✔✔Force product formula - ✔✔Bo x gm [T^2/m], where Bo = static magnetic field and
gm = magnetic spatial gradient (dB/dx)
✔✔1 T = ____ G - ✔✔10,000 G
✔✔Maximum FDA static field strength for infant (<1 mo old) - ✔✔4 T
✔✔What is the resonance frequency for 1.5 T? - ✔✔64 MHz
✔✔What is the resonance frequency for 3 T? - ✔✔128 MHz
✔✔What is the resonance frequency for 7T? - ✔✔340 MHz
✔✔What is the resonant length at 1.5T? - ✔✔25 cm
✔✔What is the resonant length at 3T? - ✔✔13 cm
✔✔What is the resonant length at 7T? - ✔✔7 cm
✔✔What is the definition of MR Safe? - ✔✔non-magnetic, non-electrically conductive,
non-metallic
✔✔Patient heating is (linearly/quadratically/not) proportional to static field strength -
✔✔quadratically (requires higher RF frequencies to induce resonance, higher frequency
means more heating)
✔✔B1+rms is (linearly/quadratically/not) proportional to static field strength - ✔✔not
, ✔✔What are typical dose concentrations for gadolinium? - ✔✔500-1000 mM
✔✔What zone(s) are not "required" to have postings? - ✔✔Zone 1, Zone 2 (may not
exist)
✔✔ICNIRP limit for the general public - ✔✔400 mT
✔✔Would a control room ever be considered zone 4? - ✔✔No, but if the 5 gauss line
extends into it it could pose a hazard and require screening
✔✔Will an object that deflects 90 degrees 1 meter from isocenter on a 3T unit be safer
at 1.5T? - ✔✔not necessarily, due to magnetic saturation
✔✔Formula for translational force - ✔✔mg x tan(α), where mg = and α = deflection
angle
✔✔What is the boiling temperature of liquid helium? - ✔✔4.2 K
✔✔Current Density (J) formula - ✔✔J = ծ (E + v x B) where ծ = Electrical conductivity, B
= Magnetic flux density, v = Velocity, E = Electrical Field strength
✔✔During scanning, what area of the patient will experience heating? - ✔✔RF area of
exposure (slice not important)
✔✔IEC time-varying magnetic field limit - ✔✔3 T/s
✔✔What considerations should be given to a fetus in MRI scanning? - ✔✔hearing,
contrast, heating
✔✔As we move away from isocenter, the change in RF energy deposition falls off at a
factor of... - ✔✔10
✔✔What level of MR safety training at a minimum must an MR technologist have? -
✔✔Level 2
✔✔All patients who receive what kind of agent may have eGFR drawn per the ACR
Manual of Contrast Media v10.3? - ✔✔group 2
✔✔What is FPO:basic? - ✔✔A mode of operation defined by the IEC in which gradient
fields and RF heating are at an absolute minimum. Only applicable to 1.5 T
