Diagnostic mri slice thickness selection

interaction of magnetic fields in time

describe the bloch equation

dM/dt = M(t) x gammaB(t)

bloch equation

T1 and T2

used to distinguish materials in MRI

42.57 MHz/Tesla

larmor frequency of proton

frequency = B_0 gamma/2pi

larmor frequency equation

resonance

maximum transfer of energy from em wave to net magnetizaiton

match em wave frequency to spin frequency

how to maximize energy transfer ffrom em wave to net magnetization

T2

describes the relaxation of the spread

T1

describes the relaxation of the magnet moving back up to follow B0

RF pulse

type of wave used to move magnet

weaker

magnetic field around/from magnet gets (stronger/weaker) during T2

current

what does the drop in magnetic field during T2 lead to