The Basics of MRI: T1 vs. T2
The Basics of MRI: T1 vs. T2
The Basics of MRI: T1 vs. T2
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Frank Minja, HMS III<br />
Gillian Lieberman, MD<br />
<strong>The</strong> Other Spin - Precession<br />
• <strong>The</strong> external magnetic field exerts a torque on the tiny<br />
magnetic moments causing them to precess around the<br />
vertical axis.<br />
• Thus the tiny magnetic moments, parallel or anti-parallel,<br />
are not fixed in space, but are in constant precession<br />
around the vertical axis <strong>of</strong> the external magnetic field.<br />
• <strong>The</strong> rate <strong>of</strong> precession (Larmor frequency) is proportional<br />
to the strength <strong>of</strong> the external magnetic field.<br />
• Precession around the vertical axis<br />
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