How to simulate the motion of water moleclues under magnetic field?

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Do you know any MR image dataset?

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Robert Tournier

Introduce some magnetic impurities (not in the brain) in water under inhomogeneous field or put water in a field gradient using the few magnetic oxygen atoms and vary the field and consequently its gradient

Ibrahim M. Ibrahim

Robert Tournier thank you sir. but I was asking for a software or a webserver to simulate the motion of water molecules under magnetic field