2016_Imaging for Physicists

Result: geometrical distortion in spin-echo imaging

zyx B ) , ,(

G zyxB x x x ) , ,( ∆

∆ +=

+

0

1

G

G

x

x

In the frequency-encoding direction, both the non-linearity of the frequency- encoding gradient and static field inhomogeneity cause geometric distortions

G B y y y ∆ +=

1

G

y

In the phase-encoding direction, distortions are solely caused by the non- linearity of the phase-encoding gradient