Unit 4 Flashcards
What is quantum mechanical description?
study of individual units behave and react to B0 and RF;
individual H+
What is classical mechanical description?
study of “groups”behave and react to B0 and RF;
net magnetic vector
What is nuclear magnetic moment?
magnetic strength and orientation of an object
What is net magnetization?
vector in which most magnetic moments are oreinted
What is precession?
wobbling of H+’s magnetic moment around B0
What is Larmor/resonant frequency?
frequency of precession
Unit of measure for Larmor/resonant frequency
MHz/T
What is resonance?
ability of M vector to gain energy from an RF
What is gyromagnetic ratio?
frequency of precession at 1T
What is laboratory frame of reference?
viewing the rotation from outside the rotation
What is rotating frame of reference?
viewing the rotation from inside the rotation
What is spin/proton density?
the more H+ in a sample, the greater the M
Relationship between the number of protons in the nucleus and magnetic moment
of protons not equal to # of neutron the atom has a magnetic moment
Relation between high/low energy states and parallel/antiparallel
High energy = antiparallel
Low energy = parallel
Orientation and strength of net magnetization in presence/absence of external field
Presence - M is w/ B0
Absence - there is no M
