slides - Brainmapping.ORG
slides - Brainmapping.ORG
slides - Brainmapping.ORG
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NMR Signal Detection<br />
8-Channel Head Coil<br />
Each coil element has a unique sensitivity profile.<br />
• Coil only detects Mxy<br />
• Coil does not detect Mz<br />
• Coil must be properly oriented<br />
Faraday’s Law<br />
of Induction<br />
✓<br />
V (t) / sin<br />
M xy<br />
Radiology<br />
Radiology<br />
Dipoles to Images<br />
Gradients – Gx, Gy, & Gz<br />
µ Magnetic Moment<br />
M z<br />
M xy<br />
S (t)<br />
⇥<br />
S k<br />
I ( x)<br />
Bulk Magnetization<br />
Transverse Magnetization<br />
Received Signal<br />
k-space signal<br />
Image<br />
} B 0<br />
} B 1<br />
} Coil<br />
} Gradients<br />
} FFT<br />
17<br />
Radiology
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