2026 MRSE UPDATED EXAMS SCRIPT QUESTIONS
AND ANSWERS SURE A+
✔✔IEC auditory limits - ✔✔MRI Equipment: 140dB, Patient Limit: 99dBA
✔✔Drop-off, signal loss, and misregistration are caused by what? - ✔✔gradient and/or
RF system errors
✔✔What is the name for the increase in reactions with a contrast agent with newly
introduced agents - ✔✔The Weber effect
✔✔What parameter has the greatest effect on peripheral nerve stimulation (PNS)? -
✔✔echo time
✔✔What is rheobase and what are typical values? - ✔✔The minimum electrical field to
produce stimulation in muscle. 2.2 V/m or 20 T/s
✔✔Magnetic flux density (B) formula - ✔✔B = µ (H+M) where µ = Permeability (H/m ),
M = Magnetism, H = Magnetic field strength
✔✔Larmor equation - ✔✔ω = y x Bo, Bo= Magnetic flux density of static field, ω =
Precessional frequency [Hz], y = Gyromagnetic ratio [T]
, ✔✔Induced Magnetic Field (M) formula (magnetism) - ✔✔M = X * H, where X = Mass
susceptibility, H = Magnetic field strength
✔✔Magnetic torque (T) formula - ✔✔T = M x B x SinѲ, where M = Magnetism, B =
Magnetic flux density, Ѳ = angle relative to Bo
✔✔Magnetism (M) formula - ✔✔M= XM*B/ µ, where µ = Permeability (H/m), XM =
magnetic susceptibility, B = magnetic flux density, M is parallel to the applied field
✔✔Intensity of magnetism (X) formula (magnetic susceptibility) - ✔✔X = M/H, where M
= Magnetism, H = Magnetic field strength
✔✔Permeability (µ) formula - ✔✔µ = µ0 (X+1), where µ0 = , X = Magnetic Susceptibility
✔✔What is the Lenz force? - ✔✔Generated by moving a conductive material thru a
changing magnetic flux. The result is an opposing magnetic field proportional to the
movement speed thru a magnetic flux, the magnetic field's strength, and the exposed
conductor's surface area
✔✔Nickel is (paramagnetic/diamagnetic/ferromagnetic) - ✔✔ferromagnetic
✔✔Remanence - ✔✔describes how well a ferromagnetic object retains its magnetic
field
✔✔Coercivity - ✔✔describes how well a ferromagnetic material can become
demagnetized in an applied magnetic field.
✔✔Curie temperature - ✔✔temperature at which a metal loses its ferromagnetic
properties
✔✔What is shimming? - ✔✔manipulation of the magnetic field at isocenter to be uniform
✔✔What is passive shimming? - ✔✔Using ferrous materials placed at specific locations,
commonly seen with lower field units
✔✔What is active shimming? - ✔✔utilizes current running through solenoids
surrounding isocente
✔✔What is responsible for the "missile effect" or projectiles? - ✔✔magnetic spatial
gradient
✔✔What is passive shielding? - ✔✔Ferrous materials used to contain the static
magnetic field, such as the Faraday cage around Zone 4
AND ANSWERS SURE A+
✔✔IEC auditory limits - ✔✔MRI Equipment: 140dB, Patient Limit: 99dBA
✔✔Drop-off, signal loss, and misregistration are caused by what? - ✔✔gradient and/or
RF system errors
✔✔What is the name for the increase in reactions with a contrast agent with newly
introduced agents - ✔✔The Weber effect
✔✔What parameter has the greatest effect on peripheral nerve stimulation (PNS)? -
✔✔echo time
✔✔What is rheobase and what are typical values? - ✔✔The minimum electrical field to
produce stimulation in muscle. 2.2 V/m or 20 T/s
✔✔Magnetic flux density (B) formula - ✔✔B = µ (H+M) where µ = Permeability (H/m ),
M = Magnetism, H = Magnetic field strength
✔✔Larmor equation - ✔✔ω = y x Bo, Bo= Magnetic flux density of static field, ω =
Precessional frequency [Hz], y = Gyromagnetic ratio [T]
, ✔✔Induced Magnetic Field (M) formula (magnetism) - ✔✔M = X * H, where X = Mass
susceptibility, H = Magnetic field strength
✔✔Magnetic torque (T) formula - ✔✔T = M x B x SinѲ, where M = Magnetism, B =
Magnetic flux density, Ѳ = angle relative to Bo
✔✔Magnetism (M) formula - ✔✔M= XM*B/ µ, where µ = Permeability (H/m), XM =
magnetic susceptibility, B = magnetic flux density, M is parallel to the applied field
✔✔Intensity of magnetism (X) formula (magnetic susceptibility) - ✔✔X = M/H, where M
= Magnetism, H = Magnetic field strength
✔✔Permeability (µ) formula - ✔✔µ = µ0 (X+1), where µ0 = , X = Magnetic Susceptibility
✔✔What is the Lenz force? - ✔✔Generated by moving a conductive material thru a
changing magnetic flux. The result is an opposing magnetic field proportional to the
movement speed thru a magnetic flux, the magnetic field's strength, and the exposed
conductor's surface area
✔✔Nickel is (paramagnetic/diamagnetic/ferromagnetic) - ✔✔ferromagnetic
✔✔Remanence - ✔✔describes how well a ferromagnetic object retains its magnetic
field
✔✔Coercivity - ✔✔describes how well a ferromagnetic material can become
demagnetized in an applied magnetic field.
✔✔Curie temperature - ✔✔temperature at which a metal loses its ferromagnetic
properties
✔✔What is shimming? - ✔✔manipulation of the magnetic field at isocenter to be uniform
✔✔What is passive shimming? - ✔✔Using ferrous materials placed at specific locations,
commonly seen with lower field units
✔✔What is active shimming? - ✔✔utilizes current running through solenoids
surrounding isocente
✔✔What is responsible for the "missile effect" or projectiles? - ✔✔magnetic spatial
gradient
✔✔What is passive shielding? - ✔✔Ferrous materials used to contain the static
magnetic field, such as the Faraday cage around Zone 4
