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
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