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RE: The MRI and Looping: For Ambient & Experimental Music?
amazing how strong the magnetic field is in the room. Walk in with a 6"
needle about 2mm in diameter at the end of a string and watch it levitate and
align itself with the field....catheters, etc. are a problem because they also
will induce eddy currents and raise the temperature in the patient if
blood circulation is impeded. Metal in the body isn't necessarily a
problem if it has "grown into" the surrounding tissue; if it's long and thin
there are eddy current problems but dislodging it in the body isn't a problem
unless it's a newer implant of sorts.
internal communication is either fiber optics or old fashioned tubes depending
on the system.
field obviously gets stronger the closer one is, that's why a parabolic
mic from the doorway or perhaps using the tube technology in reverse would be
the way to go.
I was talking with one of the techs at the hospital
where I work about this discussion. He told me that there is nothing metal in
the room. In fact if you have a tattoo, they pack it in ice because something
in the ink reacts to the high magnetism and makes it really hot. I asked about
the Microphone they have in the room and he was telling me that all the
communication wiring is done with fiber optics. I was wondering about using a
couple of contact pickups, I have a few McIntyres kicking around here, on the
door or the window and seeing what it would pickup. If I get a chance, I can
ask about it if you like.
At 02:09 PM 12/7/2005, you wrote:
would be outstanding. Perhaps putting the recording in the control room of
the MRI facility and having the wires run into the room, two stereo
microphones on either side of the machine would be ideal, but that may not
be feasible. Even a basis minidisc recorder with a small stereo microphone
attached would be good enough raw material for me!
Your comment about the
headphones explains why the headphones they put on me were attached to
plastic tubing that ran to the control room...just the like good ol' fashion
communication system in boats and submarines! I think a mic would be
fine outside the machine. When I had my MRI, there were plenty of objects in
the room around the machine...I just couldn't have any metallic objects on
my body inside it. They were really concerned about that. I was shot in the
leg by a .357 magnum when I was a teenager, which left several pieces of
soft lead in my leg, which were removed surgically. That was enough for them
to open their manual and search for data on that caliber of gun, types of
bullets, copper vs. lead shells, etc.