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(

)

(

)

y

G

G

distorted

Tzyx Bm

tnzyx B

tnzyxB

mnzyx

mnzyx

y

x

) , ,(

) , ,(

) , ,(

, , , ,

, , , ,

0

∆ −

∆+

∆+

Φ=

Φ

γ

γ

γ

With:

Φ

distorted

the distorted phase evolution

Φ

the ideal phase evolution:

Distortion of phase evolution

(

)

y y

x

TG ym tn xG mnzyx

∆ −∆ =

Φ

γ

γ

, , , ,