Module 2: Basic Principles of MRI Flashcards
Understand atomic structure and how this contributes to image formation. Explain magnetic moments, precession, net magnetization vectors, and the Law of Electromagnetism. State the Larmor Equation, and understand how to use it and its importance to MRI. Explain resonance, excitation, and the role of radio frequency and flip angles. Understand the basics of how an MRI signal is produced, and the role of free induction decay, relaxation, T1 recovery, and T2 decay. Define a pulse sequence, TR, and
What is the most abundant atom in the body?
Hydrogen
True of False: MRI can only image atoms who’s nuclei have an even mass number.
False. MRI can only image atom’s who’s nuclei have an odd mass number.
What are the three individual forces listed in the law of electromagnetism?
1) Motion
2) Magnetism
3) Charge
(If two of these forces are present the third is automatically induced)
What is the MR active isotope of the hydrogen nucleus typically used in clinical MRI?
Protium
List 6 MR active nuclei
hydrogen (H), carbon (C), nitrogen (N), fluorine (F), sodium (Na), and phosphorus (P)
List two reasons Hydrogen is ideal for MR imaging.
1) it is most abundant in the human body (we are 60% water, i.e. H2O)
2) it has an atomic and mass number of 1 (meaning it has a solitary proton which gives it a strong magnetic moment)
- All other All other MR active nuclei are present in much smaller amounts in the human body.
