ARMRIT MRI Registry Review and Practice
Exam Guide 2025/2026 U.S. Certification Prep –
Complete 150-Question Practice Exam with
Answers and Rationales
Core Domains Covered
• MRI Physics & Instrumentation – Nuclear magnetism, resonance,
relaxation (T1, T2, T2*), Larmor equation, coils, gradients, shimming,
magnet types
• Pulse Sequences & Image Contrast – Spin echo, gradient echo, inversion
recovery, fast spin echo, echo planar imaging (EPI), contrast weighting
• Patient Management & Safety – Screening, contraindications, implants,
claustrophobia, sedation, emergency preparedness, pregnancy
• MR Safety (Zone System) – Zones I–IV, cryogen safety, RF burns,
projectile hazards, acoustic noise, SAR, nerve stimulation
• Cross-Sectional Anatomy – Brain, spine, head/neck, musculoskeletal,
abdomen, pelvis, angiography
• Imaging Procedures – Positioning, protocol selection, coil placement,
parameter optimization
• Contrast Agents & Pharmaceutical Administration – Gadolinium-based
agents, nephrogenic systemic fibrosis (NSF), dosage, administration
• Equipment Operation & Quality Assurance – ACR phantom, calibration,
artifacts, troubleshooting, quality control
1. Which subatomic particle is primarily responsible for the magnetic
properties of an atom utilized in Magnetic Resonance Imaging?
A. Neutron
B. Electron
,C. Proton
D. Photon
Rationale: The hydrogen proton (¹H) is the nucleus used in MRI due to its
abundance in the human body and its magnetic moment. The proton acts like a tiny
bar magnet, aligning with the external magnetic field.
2. What is the primary function of shim coils in an MRI system?
A. To generate the powerful, static main magnetic field (B₀)
B. To transmit and receive radiofrequency (RF) energy
C. To correct for small inhomogeneities in the main magnetic field
D. To spatially encode the MR signal by creating gradient fields
Rationale: Shim coils are used to produce small magnetic fields that compensate
for non-uniformities in the main magnetic field (B₀). This improves image quality
by ensuring the field is as homogeneous as possible across the imaging volume.
3. The T1 process is also known as:
A. Spin-spin relaxation
B. Spin-lattice relaxation
C. Free induction decay
D. Phase coherence
Rationale: T1 relaxation is the process by which protons transfer energy to the
surrounding molecular lattice, allowing longitudinal magnetization to recover. It is
also called spin-lattice relaxation.
4. Which type of MR magnet requires cryogen to cool the magnetic coil to 4
degrees Kelvin (-269°C)?
A. Permanent magnet
B. Resistive magnet
C. Superconductive magnet
D. Electromagnet
,Rationale: Superconductive magnets require cryogens (liquid helium or nitrogen)
to maintain the coil at extremely low temperatures, allowing current to flow
without resistance. Most clinical MRI systems use superconductive magnets.
5. According to the Larmor equation, what determines the precise
precessional frequency of hydrogen protons?
A. The amplitude of the applied Radiofrequency (RF) pulse
B. The specific Gyromagnetic Ratio of hydrogen and the strength of B₀
C. The temperature of the cryogens cooling the magnet
D. The number of slices acquired in the pulse sequence
Rationale: The Larmor equation (ω = γ × B₀) states that precessional frequency is
the product of the gyromagnetic ratio (γ, a constant for each nucleus) and the
strength of the external magnetic field (B₀).
6. The gyromagnetic ratio of hydrogen at 1.0T is approximately:
A. 21.28 MHz/T
B. 42.58 MHz/T
C. 63.87 MHz/T
D. 127.74 MHz/T
Rationale: The gyromagnetic ratio (γ) for hydrogen is approximately 42.58
MHz/T. At 1.0 T, the Larmor frequency (ω) = 42.58 MHz. At 1.5 T, it is 63.87
MHz; at 3.0 T, it is 127.74 MHz.
7. T2 relaxation is also known as:
A. Spin-spin relaxation
B. Spin-lattice relaxation
C. Free induction decay
D. Longitudinal relaxation
Rationale: T2 relaxation is the process by which transverse magnetization decays
due to dephasing of spins caused by spin-spin interactions. It is also called spin-
spin relaxation.
, 8. The Free Induction Decay (FID) signal is the signal that:
A. Is collected to form an echo
B. Is produced immediately after the RF pulse before any gradients are
applied
C. Is produced by the gradient coils
D. Is produced by the shim coils
Rationale: The FID is the MR signal produced immediately after the RF pulse,
before any gradients are applied. It decays as the transverse magnetization
dephases.
9. Which of the following is NOT a type of MRI magnet?
A. Superconductive magnet
B. Resistive magnet
C. Permanent magnet
D. Paramagnetic magnet
Rationale: The three types of MRI magnets are superconductive, resistive, and
permanent. Paramagnetic refers to the property of certain materials (like
gadolinium) that are weakly attracted to magnetic fields.
10. The term "isocenter" in MRI refers to:
A. The center of the gradient coils
B. The point where the magnetic field is most homogeneous
C. The center of the RF coil
D. The point where the patient is positioned
Rationale: The isocenter is the point at the center of the magnetic field where the
field is most homogeneous. It is where the patient is typically positioned for
imaging.
11. What is the purpose of a Faraday cage (RF shield) in an MRI room?
Exam Guide 2025/2026 U.S. Certification Prep –
Complete 150-Question Practice Exam with
Answers and Rationales
Core Domains Covered
• MRI Physics & Instrumentation – Nuclear magnetism, resonance,
relaxation (T1, T2, T2*), Larmor equation, coils, gradients, shimming,
magnet types
• Pulse Sequences & Image Contrast – Spin echo, gradient echo, inversion
recovery, fast spin echo, echo planar imaging (EPI), contrast weighting
• Patient Management & Safety – Screening, contraindications, implants,
claustrophobia, sedation, emergency preparedness, pregnancy
• MR Safety (Zone System) – Zones I–IV, cryogen safety, RF burns,
projectile hazards, acoustic noise, SAR, nerve stimulation
• Cross-Sectional Anatomy – Brain, spine, head/neck, musculoskeletal,
abdomen, pelvis, angiography
• Imaging Procedures – Positioning, protocol selection, coil placement,
parameter optimization
• Contrast Agents & Pharmaceutical Administration – Gadolinium-based
agents, nephrogenic systemic fibrosis (NSF), dosage, administration
• Equipment Operation & Quality Assurance – ACR phantom, calibration,
artifacts, troubleshooting, quality control
1. Which subatomic particle is primarily responsible for the magnetic
properties of an atom utilized in Magnetic Resonance Imaging?
A. Neutron
B. Electron
,C. Proton
D. Photon
Rationale: The hydrogen proton (¹H) is the nucleus used in MRI due to its
abundance in the human body and its magnetic moment. The proton acts like a tiny
bar magnet, aligning with the external magnetic field.
2. What is the primary function of shim coils in an MRI system?
A. To generate the powerful, static main magnetic field (B₀)
B. To transmit and receive radiofrequency (RF) energy
C. To correct for small inhomogeneities in the main magnetic field
D. To spatially encode the MR signal by creating gradient fields
Rationale: Shim coils are used to produce small magnetic fields that compensate
for non-uniformities in the main magnetic field (B₀). This improves image quality
by ensuring the field is as homogeneous as possible across the imaging volume.
3. The T1 process is also known as:
A. Spin-spin relaxation
B. Spin-lattice relaxation
C. Free induction decay
D. Phase coherence
Rationale: T1 relaxation is the process by which protons transfer energy to the
surrounding molecular lattice, allowing longitudinal magnetization to recover. It is
also called spin-lattice relaxation.
4. Which type of MR magnet requires cryogen to cool the magnetic coil to 4
degrees Kelvin (-269°C)?
A. Permanent magnet
B. Resistive magnet
C. Superconductive magnet
D. Electromagnet
,Rationale: Superconductive magnets require cryogens (liquid helium or nitrogen)
to maintain the coil at extremely low temperatures, allowing current to flow
without resistance. Most clinical MRI systems use superconductive magnets.
5. According to the Larmor equation, what determines the precise
precessional frequency of hydrogen protons?
A. The amplitude of the applied Radiofrequency (RF) pulse
B. The specific Gyromagnetic Ratio of hydrogen and the strength of B₀
C. The temperature of the cryogens cooling the magnet
D. The number of slices acquired in the pulse sequence
Rationale: The Larmor equation (ω = γ × B₀) states that precessional frequency is
the product of the gyromagnetic ratio (γ, a constant for each nucleus) and the
strength of the external magnetic field (B₀).
6. The gyromagnetic ratio of hydrogen at 1.0T is approximately:
A. 21.28 MHz/T
B. 42.58 MHz/T
C. 63.87 MHz/T
D. 127.74 MHz/T
Rationale: The gyromagnetic ratio (γ) for hydrogen is approximately 42.58
MHz/T. At 1.0 T, the Larmor frequency (ω) = 42.58 MHz. At 1.5 T, it is 63.87
MHz; at 3.0 T, it is 127.74 MHz.
7. T2 relaxation is also known as:
A. Spin-spin relaxation
B. Spin-lattice relaxation
C. Free induction decay
D. Longitudinal relaxation
Rationale: T2 relaxation is the process by which transverse magnetization decays
due to dephasing of spins caused by spin-spin interactions. It is also called spin-
spin relaxation.
, 8. The Free Induction Decay (FID) signal is the signal that:
A. Is collected to form an echo
B. Is produced immediately after the RF pulse before any gradients are
applied
C. Is produced by the gradient coils
D. Is produced by the shim coils
Rationale: The FID is the MR signal produced immediately after the RF pulse,
before any gradients are applied. It decays as the transverse magnetization
dephases.
9. Which of the following is NOT a type of MRI magnet?
A. Superconductive magnet
B. Resistive magnet
C. Permanent magnet
D. Paramagnetic magnet
Rationale: The three types of MRI magnets are superconductive, resistive, and
permanent. Paramagnetic refers to the property of certain materials (like
gadolinium) that are weakly attracted to magnetic fields.
10. The term "isocenter" in MRI refers to:
A. The center of the gradient coils
B. The point where the magnetic field is most homogeneous
C. The center of the RF coil
D. The point where the patient is positioned
Rationale: The isocenter is the point at the center of the magnetic field where the
field is most homogeneous. It is where the patient is typically positioned for
imaging.
11. What is the purpose of a Faraday cage (RF shield) in an MRI room?
