Ferrofluid Used as MRI Contrast Agent: Heat Risk?

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    Ferrofluid Mri
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anorred
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so it seems ferrofluids might be used for mri scanners as contrast agents. Wouldn't the ferrofluid get hot?
 
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The strong field is static, I don't know the power of the weaker fields. In addition, if they are in good thermal contact to the environment the heat gets distributed quickly. I would not expect problems from heat.
 

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