In-room imaging and MR planning

Effect of b-values on DWI: free diffusion

Water phantom (NiS04.6H20/NaCL)

Mean DWI (50 directions)

300

SNR ≒ 1

SNR ≒ 1

0

b=0

b=500

b=1000

b=1500

b=2000

b=2500

Signal, DWI

ln S/S0

ADC

(mm 2 /s) 0.0025

(mm 2 /s)

1200

-4.5 -4 -3.5 -3 -2.5 -2 -1.5 -1 -0.5 0

1000

0.002

800

0.0015

600

0.001

400

0.0005

200

0

0

0

500 1000 1500 2000 2500

0 500 1000 1500 2000 2500

500 1000 1500 2000 2500

b-value (s/mm 2 )

b-value (s/mm 2 )

b-value (s/mm 2 )

Litcofsky & Tazoe, Pittsburg University