Drug patches can cause MRI burns

Discussion in 'The Watercooler' started by gcvmom, Mar 5, 2009.

  1. gcvmom

    gcvmom Here we go again!

  2. Lothlorien

    Lothlorien Active Member Staff Member

    Thanks for the info. This is important.
  3. Marg's Man

    Marg's Man Member

    I wrote something about this sort of thing happening in Star's "nye knot nye nung neersed" thread.

    In that thread we talking about piercings and other extreme 'decorations'. They will have to divest themselves of all their piercings if they ever get a MRI done. The "M" stands for magnetic and the magnet involved generates SERIOUSLY strong fields.

    At these strengths metal inclusions can be literally pulled out of the body in a straight line. That is why you see those warnings about pacemakers, metallic prosthtetics, key and other metal things outside MRI units. Remember the cartoons where Tweety-pie or the Roadrunner hold up a magnet and Sylvester gets 'attacked' by a drawer full of kitchen knives? This can literally happen around a big MRI magnet. If the metals are not large enough, severe burns can result. Even metallic inks used in some tattoos can cause trouble. So I was not too surprised when I read that it was the foil backing often used in patches causing problems.

    'Non-magnetic' doesn't mean anything either. To magnets with that much power everything is magnetic. (Anyone wanting a lesson in atomic structure and diamagnetic fields explaining this statement can PM me. I'm not going into it here unless demand justifies it.)

    Marg's Man
    Last edited: Mar 5, 2009
  4. Star*

    Star* call 911........call 911

    High-gain, self-amplified spontaneous emission free-electron lasers (SASE FEL's), with proposed operation in wavelengths extending down to x rays, require intense relativistic electron beams, which under certain conditions can generate large diamagnetic fields. The action of these fields has the potential to seriously degrade FEL performance. It is shown here(If you could see my doodling) by both analysis and simulation that the finite size of the electron beams diminishes this effect so that it is negligible for proposed SASE FEL's.

    and well, that is all I know about diamagnetic fields for today. :tongue:
  5. gcvmom

    gcvmom Here we go again!

    The smarty-pants corner is wide open, Star*. Trot your donkey-lovin' booty on over there! :tongue:
  6. Star*

    Star* call 911........call 911

    Smarty-pants :tongue:or smart-donkey? Either way, thank you for the compliment!