slides - Brainmapping.ORG
slides - Brainmapping.ORG
slides - Brainmapping.ORG
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Dipoles to Images<br />
B1 Field - RF Pulse<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 />
• B1 is a<br />
– radiofrequency (RF)<br />
• 42.58MHz/T (63MHz at 1.5T)<br />
– short duration pulse (~0.1 to 5ms)<br />
– small amplitude<br />
•
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