I have an idea for a new thread...

[TNT1]

 

Hence the troll pic... Trolls and *er talk not allowed on this thread.

[HowellingWulf]

MJ looking at those burns i take it you in the MRI service/supply business? could you tell me if there is a specific reason the helium is at -269C because that is very very close to absolute zero so im thinking that there must be some reason?

Absolute zero is in fact -273.15 deg C. The boiling point of He is -269 deg C which means it wont be in liquid form at atmospheric conditions. Probably flashed over and got a freezer burn... Just guessing here...

[patches]

patches,

 

surgical implants are usually made out of Titanium wich is not magnetic making it safe to go for a MRI

 

I thought as much... but then I thought about how big this implant is and remembered from 3rd year Science of Materials that a 1m long 50mm diamter bar of surgical grade titanium is was around R70 000... I then thought the doctors may have gone cheapskate on me, haha!

[DaLoCo]

[Face Plant]

RB you are right about the temp of absolute Zero but The laws of thermodynamics state that absolute zero cannot be reached using only thermodynamic means, thats why i said that its very very close to absolute zero so theoretically -269 could be the coldest they can get Helium using normal thermodynamic means

[HowellingWulf]

http://www.airninja.com/pictures/seattle/fremont-troll.jpg

 

Cruds. Imagine that thing underneath the bridge at Witkoppen on the Spruit. I would crap myself!

[HowellingWulf]

RB you are right about the temp of absolute Zero but The laws of thermodynamics state that absolute zero cannot be reached using only thermodynamic means, thats why i said that its very very close to absolute zero so theoretically -269 could be the coldest they can get Helium using normal thermodynamic means

 

Buggered if I know. Mech. Eng this side. Thermo was never my strong suite, nor chemistry.

[MTBer wannabee]

So what does the asterix (*) stand for in the topic?

[TNT1]

So what does the asterix (*) stand for in the topic?

 

There are two numbers that shall not be mentioned here, that appear in numerous threads, they would be in place of the *.

[MTBer wannabee]

There are two numbers that shall not be mentioned here, that appear in numerous threads, they would be in place of the *.

[Capricorn]

There are two numbers that shall not be mentioned here, that appear in numerous threads, they would be in place of the *.

 

sounds like you running a numbers gang..

[splat]

So what does the asterix (*) stand for in the topic?

 

 

peopol?

[AndreZA]

This car took 350hrs to paint.

 

http://www.blogcdn.com/www.autoblog.com/media/2011/04/01-2011-camaro-airbursh.jpg

 

http://www.blogcdn.com/www.autoblog.com/media/2011/04/03-2011-camaro-airbursh.jpg

 

http://www.blogcdn.com/www.autoblog.com/media/2011/04/04-2011-camaro-airbursh.jpg

 

http://www.blogcdn.com/www.autoblog.com/media/2011/04/06-2011-camaro-airbursh.jpg

 

http://www.blogcdn.com/www.autoblog.com/media/2011/04/08-2011-camaro-airbursh.jpg

 

http://www.blogcdn.com/www.autoblog.com/media/2011/04/17-2011-camaro-airbursh.jpg

 

http://www.blogcdn.com/www.autoblog.com/media/2011/04/26-2011-camaro-airbursh.jpg

[Caerus]

This car took 350hrs to paint.

 

http://www.blogcdn.com/www.autoblog.com/media/2011/04/01-2011-camaro-airbursh.jpg

 

http://www.blogcdn.com/www.autoblog.com/media/2011/04/03-2011-camaro-airbursh.jpg

 

http://www.blogcdn.com/www.autoblog.com/media/2011/04/04-2011-camaro-airbursh.jpg

 

http://www.blogcdn.com/www.autoblog.com/media/2011/04/06-2011-camaro-airbursh.jpg

 

http://www.blogcdn.com/www.autoblog.com/media/2011/04/08-2011-camaro-airbursh.jpg

 

http://www.blogcdn.com/www.autoblog.com/media/2011/04/17-2011-camaro-airbursh.jpg

 

http://www.blogcdn.com/www.autoblog.com/media/2011/04/26-2011-camaro-airbursh.jpg

 

Thats awesome, I would be to scared to drive it.

[Captain Fastbastard Mayhem]

And took 1.5 to lose all its resale value...

[The expat cyclist]

@MJ loves MTB... when the machine is in operation, does the magnet's power increase... or is it the same whether operating or standby, and it's only the imaging unit that becomes active?

 

I ask because a couple of years ago I was sent for a head MRI. I was rather concerned as I have a metal bar bolted and wired across my ribcage. I couldn't remember didn't know what metal it was. I didn't think a ferrous metal would be used but if it was Stainless Steel, it could have had slightly magnetic properties (as is found on lesser grade St/Steel).

 

I told the radiologist about the etal bar, and she said "well, we'll just have to start it up and if it starts hurting, or gets hot, let us know".

 

Not very re-assuring right?! But luckily no problems.

 

So yeah... like you say the magnet is always on... so I would have had issues when I entered the room... right?!

The magnetic field is always at the same strength.

However, RF (radio frequency) is also part of the system. It gets transmitted by the machine to help create the image. Maybe the radiographer thought your implant can act as an antenna...But I doubt that.

 

The machine has plenty safety features to stop you from getting hurt. Plenty. It is safer than x-rays and CT's!!! The only thing it can not control is what you take into it.

 

Pacemakers are really the only thing that should be kept WELL away from MRI's.

Don't really know of implants being made of anything else than Ti or stainless steel or chinese steel...

 

Prosthetics is a different story.