In-room imaging and MR planning

Gradients

B 

0  =

• Recall that the resonant frequency is proportional to field strength

0

dB

G x

=

0

dx

• Magnetic gradient changes B 0 strength over distance • In MRI a linear gradient changes the resonant frequency in a given direction field

dB

G y

=

0

dy

dB

G z

=

) x xG B + =





(

0

dz

0