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MR physics refresher: contrast

S

0

(T2w)

S

0

* e

-bD

S = S

0

・

e

-bD

b = diffusion gradient

D = diffusion coefficient

S = M

0

・

(1 - e

-TR/T1

)

・

(e

-TE/T2

)

・

e

-bD

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