Which of the following refers to atoms with an odd mass number?
Isotopes
The stronger the external magnetic field (B₀), the:
Higher the precessional frequency
What is the term for hydrogen nuclei aligning with B₀?
Parallel alignment
The MR signal is detected in which plane?
Transverse
The hydrogen nucleus used in MRI is called:
Protium
The ______________ field is responsible for the resonance in MRI.
B1
The principle that explains how a changing magnetic field induces an electromotive force is called ___________.
Faraday’s Law
The Larmor Equation is given by:
ω₀ = B₀ × γ
What are ions?
Atoms with an excess or deficit of electrons
The NMV is the net magnetic vector resulting from excess spin-up nuclei.
True
What does the term “alignment” refer to in MRI?
The orientation of magnetic moments relative to Bo
The phenomenon in which hydrogen nuclei wobble when placed in a magnetic field is called:
Precession
What are protons?
Positively charged elements of the atomic nucleus
The process of energy absorption by hydrogen nuclei during an RF pulse is called:
Resonance
What does the mass number of an atom represent?
Sum of protons and neutrons
What is the longitudinal plane in MRI?
Axis parallel to Bo
What does the Boltzmann equation predict?
The number of spins in each energy level
What type of electromagnetic radiation is used in MRI to excite hydrogen nuclei?
Radiofrequency (RF)
What is the gyomagnetic ratio of hydrogen at 1 Tesla?
42.58 MHz
What is the unit of precessional frequency?
Megahertz (MHz)
Which particles spin around the nucleus of an atom?
Electrons
What is the primary magnetic field of the MRI scanner denoted as?
B₀
The process of returning to thermal equilibrium is known as ___________.
Relaxation
What does the term “flip angle” refer to in MRI?
The angle at which the NMV is flipped relative to Bo
