2017 Imaging for Physicists Coursebook

Impact on geometrical accuracy

Group y-terms for distortions in fase-encoding direction:

y Tzy x Bm TG ym y 1 ) , ,( 

y y TGmy





G     

 

y y

and solve for y 1

B   

G

y

y y

1

G



y

Assuming that the errors in the gradient are independent of the gradient step, this is equal to

B  

G

y

y y

1

G

y