Have you always wanted to express your passion for MRI physics but never knew how? (Come on, admit it.) If only there was an easy way of breaking into a conversation about the intrinsic nature of spin!
Well fear not, dear reader, now there is a way. Get in touch with your inner geek with Revising MRI relaxation-time wear. It’s not nerdy and sad, honest.
Put your suggestions for wry / sarcastic / witty / obscure t-shirt captions in a comment at the end of the page.
Comfortable relaxation-time wear
Get to know your inner geek.
[Note: I make no money on these]
I Precess
The earth’s magnetic field is between ~30-60μT, depending where you are on the planet
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Diamagnetic Girl
Everything is diamagnetic!
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I Precess
Does that make you dizzy?
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Diamagnetic Bloke
Can you have a diamagnetic personality?
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She Precesses
Your head spinning yet?
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Tell ‘em Girl
Got a Zeeman splitting headache?
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Tell ‘em
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Tell ‘em
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How are you precessing? The nuclear magnetism of the hydrogen protons in your body are sensing the Earth’s magnetic field. Because of the spin property of these nucleons, they precess around the direction of the external field. A stable anisotropic distribution of spins then forms, causing a net magnetisation to be present.
How are you repulsive? All materials are diamagnetic. Orbiting electrons in a material (i.e. you) are affected by an external magnetic field, such as that of the Earth. Their orbits change and as a result they generate their own magnetic field which opposes the external magnetic field within the sample (this is Lenz’s Law). But diamagnetism is usually very, very weak, and is overwhelmed by thermal motion of molecules.
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This entry was posted by Dave Higgins on Tuesday, July 18th, 2006, at 9:22 am, and was filed in All posts, Miscellaneous.
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