astraboy

I had one today, christ it was loud! I mean loud enough to need earplugs! Can anyone know what was making all that racket?
Cheers in advance,
astraboy.

Stephb1986

its the magnets inside moving i had one on my head and that was really loud

^OPM^

That was it echoing that made it soo loud for you steph

FLAT ERIC

iTrader: (1)

Howstuffworks "How MRI Works"

Mark

astraboy

Cheers for the link, but it might as well be in portuguese
I think I need the big print version with pictures.
astraboy.

X30NGO

when i had my knee done it took 45 minutes and they gave me headphones and asked me what cd i wanted on!!! sounds like you went to the wrong hospital!!!


bongo

J4CKO

iTrader: (1)

I had my ******* ultrasounded, all was silent until they squirted cold gel on the area !

porkerboy

Something like -

A magnetic field is used to align the protons in your cells, and then radio waves are used to displace them thereby creating through computers etc a high quality image.

Something along those lines - bit basic and probably not completely accurate

Abdabz

I had one too... It was how I would imagine being tortured by fax machine noises would feel like . Very loud, then it goes quiet very quite then BAM!!! Noice again... never mind checking to see how my head works (or didnt at the time), it was my heart that needed checkin after that!!
It's all to do with magnet things, hence taking off all you metal before climbing on the board...
Astraboy, I hope all is OK with you and they dont keep you waiting 10 weeks for the results like they did with me...

Terminator X

iTrader: (7)

The magnet aligns "things" within your body to magnetic North, as they move back to their normal position an image is created & shown on their screen. Not sure what the loud noise is though ... the magnets?

TX.

stevem2k

I went to sleep when I had my scan

Probably helped that there was nothing actually wrong with me, I was just helping the wife out with some testing...

...not that I'm volunteering any more, she's now doing prostate cancer research and I know where the coil goes

Terminator X

iTrader: (7)

"The patient lies inside a large, cylinder-shaped magnet. Radio waves 10,000 to 30,000 times stronger than the magnetic field of the earth are then sent through the body. This affects the body's atoms, forcing the nuclei into a different position. As they move back into place they send out radio waves of their own. The scanner picks up these signals and a computer turns them into a picture. These pictures are based on the location and strength of the incoming signals."

TX.

Stephb1986

did any of you lot have the cage put over your face like your hanibal lecter???

astraboy

no it was my ankle that needed scanning, so they put me in feet first and put a cage over that. The biggest problem i had was resisting the urge to move, it was getting painful after 20 minutes and involuntary twitching is difficult to control when your foots gone to sleep!
oh and Abdabz, I have the luxury of only a 5 week wait, but its better than nothing.
astraboy.

Chelspeed

Interesting fact - when it was a scientific curiosity it used to be called nuclear magnetic resonance or NMR.

Then for some reason when they started using it in hospitals it suddenly needed a new name to become acceptable. No nuclear material involved as we usually know it but the nucleus of atoms is magnetically aligned so nuclear resonance. But now it's MRI, all soft, cuddly and friendly.

Another thought, the magnets are super conducting and cooled with liquid helium. Lots of these machines are trailer mounted and mobile, doing one day a week at each hospital. Bit scary having an accident with all that on board.

Matteeboy

I had one on my dodgy shoulder - I'm very glad I'm not claustrophobic -Twenty minutes head first in a small tube!

Hoppy

I was told the banging noise was the alternating current zapping back and forth. Ear defenders sorted that. But luckily i'm not claustrophobic

Brilliant machines though - x-ray showed no problem in my hip, which was obviously rubbish. MRI showed severe problems in one, and the other side not much better

Op Jan 17th, if it doesn't get cancelled (again :rolleyes; )

Richard.

Neanderthal

iTrader: (6)

Had one done on my back. Was told I could bring a CD to listen to if I wanted. Glad I didn't bother cause even with the ear phones on I doubt I could have heard it.
Had it done on BUPA so got handed an envelope containing the hard copy of the scan and a CD with some nifty viewing program on which I got to keep
My back's fubared though