3 ms·

Here's a well known and SFW training video about MRI magnets. It'll put the problem into perspective without needing eye-bleach. https://youtube.com/watch?v=kL

Here's a well known and SFW training video about MRI magnets. It'll put the problem into perspective without needing eye-bleach. https://youtube.com/watch?v=kLjxhuybFWo https://youtube.com/watch?v=kLjxhuybFWo

SwiftyBug 1y ago
That seems to be very strong. What's the effect of this type of magnetic field on the iron in our blood?
- goku12 1y ago
  Apparently, oxygenated hemoglobin and blood plasma are diamagnetic, while deoxygenated hemoglobin is paramagnetic. Meaning, magnetic properties are determined by the molecules, not its elements. I assume that whatever attraction or repulsion caused by even the MRI magnets are weak compared to the forces involved in Brownian motion. So don't expect anything substantial.
  - msgodel 1y ago
    That's not so surprising. Iron isn't magnetic in all its oxidation states.
    - goku12 1y ago
      Why were you downvoted? I was going to read more on it later. So far, I know that Iron III oxide is magnetic. I don't know anything about the other oxides, ions in other oxidation states or iron in other compounds. I wish the people explained the reason why they downvoted.
  - SwiftyBug 1y ago
    This reminds me of something I've always thought that Toph – spoiler about Avatar: The Last Airbender – should also be able to blood bend since she created metal bending and the blood is full of iron.
    - goku12 1y ago
      There is a scene in one of the X-men movies where Magneto escapes a completely non-metallic prison by extracting iron from a guard's body. I initially thought that Raven had injected him the previous day with something to increase his iron content. But realized later that she had injected metallic iron as a suspension. That aside, you don't need ferromagnetic substances for it be manipulated by magnetic fields. Anything conducting can be moved around by fluctuating magnetic fields. Even non-conducting paramagnetic or diamagnetic substance will eventually respond to very high strength magnetic fields - just not at the 'feeble' strengths of an MRI machine's superconducting magnets. Here is something I collected previously on the same fun topic: https://phanpy.social/#/fosstodon.org/s/111504060685437481?view=full https://phanpy.social/#/fosstodon.org/s/111504060685437481?v...
- privatelypublic 1y ago
  FYI: MRI magnetic fields are also incredibly predictable/uniform. Very interesting tech, dumping a 100-200 watts of RF energy into somebody, and listening to the results. Then somehow turning that into a 3d spacial image. Truly makes CT scanning look like easy mode.

SwiftyBug 1y ago

That seems to be very strong. What's the effect of this type of magnetic field on the iron in our blood?

goku12 1y ago
Apparently, oxygenated hemoglobin and blood plasma are diamagnetic, while deoxygenated hemoglobin is paramagnetic. Meaning, magnetic properties are determined by the molecules, not its elements. I assume that whatever attraction or repulsion caused by even the MRI magnets are weak compared to the forces involved in Brownian motion. So don't expect anything substantial.
- msgodel 1y ago
  That's not so surprising. Iron isn't magnetic in all its oxidation states.
  - goku12 1y ago
    Why were you downvoted? I was going to read more on it later. So far, I know that Iron III oxide is magnetic. I don't know anything about the other oxides, ions in other oxidation states or iron in other compounds. I wish the people explained the reason why they downvoted.
- SwiftyBug 1y ago
  This reminds me of something I've always thought that Toph – spoiler about Avatar: The Last Airbender – should also be able to blood bend since she created metal bending and the blood is full of iron.
  - goku12 1y ago
    There is a scene in one of the X-men movies where Magneto escapes a completely non-metallic prison by extracting iron from a guard's body. I initially thought that Raven had injected him the previous day with something to increase his iron content. But realized later that she had injected metallic iron as a suspension. That aside, you don't need ferromagnetic substances for it be manipulated by magnetic fields. Anything conducting can be moved around by fluctuating magnetic fields. Even non-conducting paramagnetic or diamagnetic substance will eventually respond to very high strength magnetic fields - just not at the 'feeble' strengths of an MRI machine's superconducting magnets. Here is something I collected previously on the same fun topic: https://phanpy.social/#/fosstodon.org/s/111504060685437481?view=full https://phanpy.social/#/fosstodon.org/s/111504060685437481?v...
privatelypublic 1y ago
FYI: MRI magnetic fields are also incredibly predictable/uniform. Very interesting tech, dumping a 100-200 watts of RF energy into somebody, and listening to the results. Then somehow turning that into a 3d spacial image. Truly makes CT scanning look like easy mode.