In-room imaging and MR planning

180 o

90 o

position encoding

Position decoding

readout

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

B -ΔB

B

B +ΔB

Animations courtesy of Karla Miller, Oxford