Christine Austin, Lisa Bauer, Natalia Gudino, Prof. Mark Griswold, Prof. Robert

Brown

http://en.wikipedia.org/wiki/Magnetic_resonance_imaging

Superconducting Magnet

B0

The large “Main Magnet” causes protons to align with its field, B0.

B0

x

y

zRF Pulse

/2 Flip

Magnetization begins to precess about B0

ω= γ β0

•Design coil shape in computer

•Etch copper board

•Add capacitors

•Tune resonance frequency

•Match impedance

ω= 1

LC

Faraday’s Law

One Coil Two Coupled Coils

Top View Side View

1 - iM

12I

2 -

1

iC(I

1 - I

2) = 0

2 - iM

21I

1 -

1

iC(I

2 - I

1) = 0

1 - iM

12I

2 -

1

iC(I

1 - I

2) = 0

2 - iM

21I

1 -

1

iC(I

2 - I

1) = 0

Aal-Braij R., et al., PROC. INTL. SOC. MAG. RESON. MED. 17 (2009)

Thank you!