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Many reasons for artifacts
• Magnetic field errors
– Gradient artifacts
– Susceptibility artifacts
– Water-fat shift
• Geometrical artifacts show
up in a particular direction
x
G
x
G
zyx B
G
zyxB x x
x
) , ,(
) , ,(
0
1
∆
+
∆
+=
y
G
G
B
y y
y
∆
+=
1