Impact on geometrical accuracy
Group y-terms for distortions in fase-encoding direction:
and solve for y
1
y y
y
G
y y
TGmy
Tzy
x Bm TG ym
y
1
) , ,(
y
G
G
B
y y
y
1
y
G
G
B
y y
y
1
Assuming that the errors in the gradient are independent of the gradient
step, this is equal to