2016_Imaging for Physicists

Result: geometrical distortion in spin-echo imaging

zyx B ) , ,(

G zyxB x x x ) , ,( ∆

∆ +=

+

0

1

G

G

x

x

frequency-encoding (read-out) direction: • non-linearity of the gradient • static field inhomogeneity (= static difference in resonance frequency)

G B y y y ∆ +=

1

G

y

phase-encoding direction: • non-linearity of the gradient