Animations courtesy of Karla Miller, Oxford
90
o
readout
180
o
position
encoding
Position
decoding
B -ΔB
B +ΔB
B
Without diffusion:
all spins have fixed
position
1. All spins accrue
phase depending on
their (static) position
2. 180
°
pulse flips
magnetization
3. All spins realign
Fully refocussed signal