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DWI
Low b value
High b value
ADC map
b =
γ
2
G
2
δ
2
(
∆
-
δ
/3)
•
b-value
related to gradient strength & timing
•
Two or more b-values needed to measure
apparent diffusion
coefficient
(ADC in units of mm
2
/s)
(units of s/mm
2
)
S(b) = S0e
-ADC.b