ARMRIT MRI Registry Review and Practice Exam
Guide 2025/2026 – U.S. Certification Prep
2025/2026 Complete 200-Question Practice Exam
with Answers and Explanations
SECTION 1: MRI PHYSICS AND FUNDAMENTALS
1. Magnetism can be defined as the ability of certain substances to attract:
• A) Iron, Cobalt, Nickel
• B) Copper, Silver, Gold
• C) Aluminum, Zinc, Tin
• D) Carbon, Silicon, Phosphorus
Answer: A) Iron, Cobalt, Nickel
Explanation: These are ferromagnetic materials that are strongly attracted to
magnetic fields and can be magnetized themselves.
2. The T1 process is also known as:
• A) Spin-Spin relaxation
• B) Spin-Lattice relaxation
• C) T2* relaxation
• D) Free induction decay
Answer: B) Spin-Lattice relaxation
Explanation: T1 relaxation, or spin-lattice relaxation, occurs when protons transfer
energy to the surrounding lattice (tissue), regaining longitudinal magnetization.
,3. T2 is the measurement of time for the transverse component of the net
magnetization vector to decrease what percentage of its maximum value after a
90° RF pulse?
• A) 63%
• B) 37%
• C) 50%
• D) 100%
Answer: B) 37%
Explanation: T2 relaxation time is defined as the time required for transverse
magnetization to decay to 37% of its maximum value (1/e of original).
4. The components of the gyromagnetic ratio are:
• A) Mass to volume
• B) Magnetic moment to angular momentum
• C) Charge to mass
• D) Frequency to wavelength
Answer: B) Magnetic moment to angular momentum
Explanation: The gyromagnetic ratio (γ) describes the ratio of a particle's
magnetic moment to its angular momentum, determining its precessional
frequency.
5. What is the gyromagnetic ratio of hydrogen?
• A) 42.58 MHz/T
• B) 63.87 MHz/T
, • C) 21.29 MHz/T
• D) 127.74 MHz/T
Answer: A) 42.58 MHz/T
Explanation: Hydrogen has a gyromagnetic ratio of approximately 42.58 MHz per
Tesla, meaning at 1.5T it precesses at 63.87 MHz.
6. Which molecule precesses closer to the Larmor frequency?
• A) Water
• B) Fat
• C) Both precess at the same frequency
• D) Neither
Answer: B) Fat
Explanation: Fat precesses at a frequency approximately 3.5 ppm (about 220 Hz at
1.5T) lower than water due to chemical shift, but it is closer to the Larmor
frequency for hydrogen protons.
7. Which type of MRI magnet requires cryogen to cool magnetic coils to 4
degrees Kelvin?
• A) Resistive magnet
• B) Permanent magnet
• C) Superconductive magnet
• D) Hybrid magnet
Answer: C) Superconductive magnet
Explanation: Superconductive magnets use liquid helium to cool niobium-titanium
coils to 4K, allowing zero resistance and very high magnetic fields (1.5T-7T).
, 8. Which cryogenic material can produce temperature as low as 4 degrees
Kelvin?
• A) Liquid nitrogen
• B) Liquid oxygen
• C) Liquid helium
• D) Liquid hydrogen
Answer: C) Liquid helium
Explanation: Liquid helium boils at 4.2K (-269°C), making it essential for cooling
superconductive magnet coils.
9. Which type of MRI magnet requires no electricity and can weigh from 18,000
lb. to 200,000 lb.?
• A) Superconductive
• B) Resistive
• C) Permanent
• D) Electromagnet
Answer: C) Permanent magnet
Explanation: Permanent magnets, made from ferromagnetic materials like
neodymium-iron-boron, maintain a constant field without electricity but are very
heavy and limited to lower field strengths.
10. Which type of electromagnetic coils produce smaller magnetic fields that
allow spatial localization?
• A) RF coils
• B) Gradient coils
• C) Shim coils
Guide 2025/2026 – U.S. Certification Prep
2025/2026 Complete 200-Question Practice Exam
with Answers and Explanations
SECTION 1: MRI PHYSICS AND FUNDAMENTALS
1. Magnetism can be defined as the ability of certain substances to attract:
• A) Iron, Cobalt, Nickel
• B) Copper, Silver, Gold
• C) Aluminum, Zinc, Tin
• D) Carbon, Silicon, Phosphorus
Answer: A) Iron, Cobalt, Nickel
Explanation: These are ferromagnetic materials that are strongly attracted to
magnetic fields and can be magnetized themselves.
2. The T1 process is also known as:
• A) Spin-Spin relaxation
• B) Spin-Lattice relaxation
• C) T2* relaxation
• D) Free induction decay
Answer: B) Spin-Lattice relaxation
Explanation: T1 relaxation, or spin-lattice relaxation, occurs when protons transfer
energy to the surrounding lattice (tissue), regaining longitudinal magnetization.
,3. T2 is the measurement of time for the transverse component of the net
magnetization vector to decrease what percentage of its maximum value after a
90° RF pulse?
• A) 63%
• B) 37%
• C) 50%
• D) 100%
Answer: B) 37%
Explanation: T2 relaxation time is defined as the time required for transverse
magnetization to decay to 37% of its maximum value (1/e of original).
4. The components of the gyromagnetic ratio are:
• A) Mass to volume
• B) Magnetic moment to angular momentum
• C) Charge to mass
• D) Frequency to wavelength
Answer: B) Magnetic moment to angular momentum
Explanation: The gyromagnetic ratio (γ) describes the ratio of a particle's
magnetic moment to its angular momentum, determining its precessional
frequency.
5. What is the gyromagnetic ratio of hydrogen?
• A) 42.58 MHz/T
• B) 63.87 MHz/T
, • C) 21.29 MHz/T
• D) 127.74 MHz/T
Answer: A) 42.58 MHz/T
Explanation: Hydrogen has a gyromagnetic ratio of approximately 42.58 MHz per
Tesla, meaning at 1.5T it precesses at 63.87 MHz.
6. Which molecule precesses closer to the Larmor frequency?
• A) Water
• B) Fat
• C) Both precess at the same frequency
• D) Neither
Answer: B) Fat
Explanation: Fat precesses at a frequency approximately 3.5 ppm (about 220 Hz at
1.5T) lower than water due to chemical shift, but it is closer to the Larmor
frequency for hydrogen protons.
7. Which type of MRI magnet requires cryogen to cool magnetic coils to 4
degrees Kelvin?
• A) Resistive magnet
• B) Permanent magnet
• C) Superconductive magnet
• D) Hybrid magnet
Answer: C) Superconductive magnet
Explanation: Superconductive magnets use liquid helium to cool niobium-titanium
coils to 4K, allowing zero resistance and very high magnetic fields (1.5T-7T).
, 8. Which cryogenic material can produce temperature as low as 4 degrees
Kelvin?
• A) Liquid nitrogen
• B) Liquid oxygen
• C) Liquid helium
• D) Liquid hydrogen
Answer: C) Liquid helium
Explanation: Liquid helium boils at 4.2K (-269°C), making it essential for cooling
superconductive magnet coils.
9. Which type of MRI magnet requires no electricity and can weigh from 18,000
lb. to 200,000 lb.?
• A) Superconductive
• B) Resistive
• C) Permanent
• D) Electromagnet
Answer: C) Permanent magnet
Explanation: Permanent magnets, made from ferromagnetic materials like
neodymium-iron-boron, maintain a constant field without electricity but are very
heavy and limited to lower field strengths.
10. Which type of electromagnetic coils produce smaller magnetic fields that
allow spatial localization?
• A) RF coils
• B) Gradient coils
• C) Shim coils
