Well I spent a half hour of my life under the magnet of an "open" MRI machine yesterday. Still a bit claustrophobic. While I sort of understand the theory of the MRI, what I don't understand is what creates all the noise and racket. Any experts out there that can tell me whats going on?
-- Joe Leikhim K4SAT "The RFI-EMI-GUY"© "Treason doth never prosper: what\'s the reason? For if it prosper, none dare call it treason." "Follow The Money" ;-P
It's coming off the gradient magnets, usually. I hope all is ok and you won't receive any nasty diagnosis from the session.
-- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
Pulsed gradient coils. These are "small" 3-axis coils that sweep a gradient field across your innards, modulating the nuclear resonant frequencies of your molecules to produce the spatial resolution. These are generally water-cooled, with ballpark 20 KW constant-current drivers per axis, playing all sorts of weird waveforms.
They scanned my head last year, with the gradient coils around my head like some horror mask: noisy and boring.
John
A few years ago they scanned my sinuses.
I must admit a claustrophobic feeling also :-(
...Jim Thompson
-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC\'s and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | | | | America: Land of the Free, Because of the Brave | | | | Due to excessive spam, googlegroups, UAR & AIOE are blocked! |
That's probably because you guys don't have a house with a narrow crawl space. At least you can be sure that there won't be critters such as rattle snakes waiting inside that MRI tube.
-- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
No crawl space, but I can stand up straight in my attic... now partially floored for storage.
Mostly scorpions around here ;-)
...Jim Thompson
-- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC\'s and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | | | | America: Land of the Free, Because of the Brave | | | | Due to excessive spam, googlegroups, UAR & AIOE are blocked! |
Noisy & boring is right. I fell asleep briefly and was mildly scolded for it - they could see my eyeballs rolling around.
-- Joe
me
I had a rattle snake in my garage a couple of weeks ago.
Any obvious neural effects from the scanning fields?
-- Dirk http://www.transcendence.me.uk/ - Transcendence UK Remote Viewing classes in London
Is that because they check them every morning?
-- Dirk http://www.transcendence.me.uk/ - Transcendence UK Remote Viewing classes in London
-- How would he know? ;) JF
-- The coils? ;) JF
Thanks, nothing serious except a bad pain in my neck C5/C6 disk problems. It was a bit disheartening to hear the technician say "that looks real bad, you should get that fixed" Then I remembered she said same thing two years ago. The Dr reports it is same as before, only now it hurts worse. I guess I gotta do something :(
-- Joe Leikhim K4SAT "The RFI-EMI-GUY"© "Treason doth never prosper: what\'s the reason? For if it prosper, none dare call it treason." "Follow The Money" ;-P
Are they inside the machine or are they in the frame clamped around my head and neck?
-- Joe Leikhim K4SAT "The RFI-EMI-GUY"© "Treason doth never prosper: what\'s the reason? For if it prosper, none dare call it treason." "Follow The Money" ;-P
I told the tech to give me a time check every so often so I wouldn't lose my mind, then I worked out a design problem in my head for 30 minutes as a distraction. I can put up with a lot of stuff but being inside or under that thing creeps me out. I keep having visions of oxygen cylinders getting sucked through the drywall and crushing me or the magnet quenching and getting burned in a puff of steam.
-- Joe Leikhim K4SAT "The RFI-EMI-GUY"© "Treason doth never prosper: what\'s the reason? For if it prosper, none dare call it treason." "Follow The Money" ;-P
They should never say that. It's almost like a surgeon saying "Oh s..t! That wasn't good."
Must be painful. My sore ones are L4/L5/L6. The docs never figured out that I might have a magnesium deficiency. A CPA (!) gave me that hint. Taking them big Costco pills since two years. Knock on wood, in those two years it hasn't floored me once and that's a record.
-- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
They're moving? Wires loose? It certainly is noisy. I went into the tube last year. I'm pretty claustrophobic, but handled it OK. Not a chance of sleeping though. I certainly was ready to come out after a half-hour.
Find anything? ;-)
-- Keith
...and found nothing? 8-) SCNR. I'm surpirsed no one else took the shot.
Well, bits of him twitching abnormally might be a sign. Google TMS
-- Dirk http://www.transcendence.me.uk/ - Transcendence UK Remote Viewing classes in London
What an absurd fear. It quenches, a lot of cold helium blows out, the O2 in the room is displaced, and you die painlessly of asphixiation.
John
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