2017 Imaging for Physicists Coursebook

466-467 / 1363

Effect of b-values on DWI:
free diffusion
b=500 b=1000 b=1500 b=2000 b=2500
Mean DWI (50 directions)
b=0
300
0
Water phantom
(NiS04.6H20/NaCL)
Signal, DWI ln S/S0 ADC
b-value (s/mm2) b-value (s/mm2) b-value (s/mm2)
(mm2/s) (mm2/s)
SNR ≒ 1 SNR ≒ 1
0
200
400
600
800
1000
1200
0 500 1000 1500 2000 2500
-4.5
-4
-3.5
-3
-2.5
-2
-1.5
-1
-0.5
0
0 500 1000 1500 2000 2500
0
0.0005
0.001
0.0015
0.002
0.0025
500 1000 1500 2000 2500
Litcofsky & Tazoe, Pittsburg University