Author Topic: Remove all metal items before going to MR scan  (Read 3107 times)

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Offline Askold

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Remove all metal items before going to MR scan
« on: October 07, 2014, 01:36:54 am »
Demonstrational video explains the dangers of bringin metal items to MR Imaging enviroment:

<a href="http://www.youtube.com/watch?v=6BBx8BwLhqg" target="_blank">http://www.youtube.com/watch?v=6BBx8BwLhqg</a>


An article from American Journal of Roentgenology concerning an actual case of someone with a metal item in MR: http://www.ajronline.org/doi/full/10.2214/ajr.178.5.1781092

In this particular case that metal item happened to be a .45ACP pistol. 'MURRICA STRONG!!! RIGHT TO BEAR ARMS!!! RAARHG!!!



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Offline Sleepy

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Re: Remove all metal items before going to MR scan
« Reply #1 on: October 07, 2014, 07:06:49 am »
Wow, that's ridiculous. I have an MRI roughly every year, and restrictions have gotten even tighter recently. I used to be allowed to wear my normal clothes for the procedure, but now they force me to change into a hospital gown. They also freaked out at me one time because they thought I might be pregnant (all I said was that I hadn't had a period lately, because birth control does that). They're careful as hell.
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Offline Old Viking

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Re: Remove all metal items before going to MR scan
« Reply #2 on: October 07, 2014, 03:20:00 pm »
Do they realize those machines probably cost close to $100?
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Offline Ultimate Paragon

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Re: Remove all metal items before going to MR scan
« Reply #3 on: October 07, 2014, 03:31:19 pm »
Wow, that's ridiculous. I have an MRI roughly every year, and restrictions have gotten even tighter recently. I used to be allowed to wear my normal clothes for the procedure, but now they force me to change into a hospital gown. They also freaked out at me one time because they thought I might be pregnant (all I said was that I hadn't had a period lately, because birth control does that). They're careful as hell.

Well, I guess they don't want to take any unnecessary chances.

Offline Svata

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Re: Remove all metal items before going to MR scan
« Reply #4 on: October 07, 2014, 03:42:18 pm »
Do they realize those machines probably cost close to $100?

You, uh, might be missing a zero or two in there.
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Offline Cerim Treascair

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Re: Remove all metal items before going to MR scan
« Reply #5 on: October 07, 2014, 06:43:22 pm »
Uh... YEAH! I thought this was common fucking knowledge! MRI's use incredible magnetic fields! DUH!
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Offline Søren

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Re: Remove all metal items before going to MR scan
« Reply #6 on: October 07, 2014, 06:48:33 pm »
People with dodgy tattoos can't even get mris. When I got an MRI I was asked where I got mine
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Offline chitoryu12

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Re: Remove all metal items before going to MR scan
« Reply #7 on: October 07, 2014, 09:52:57 pm »
Do they realize those machines probably cost close to $100?

You, uh, might be missing a zero or two in there.

He said close. Not how close.
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Offline Hoplite

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Re: Remove all metal items before going to MR scan
« Reply #8 on: October 22, 2014, 10:19:10 pm »
Yup. I got kicked out of a MRI room because I had a bismuth bandage patch over a 2nd degree burn. Bismuth is a metallic element.

It took a good two weeks to get another appointment.
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Offline Sigmaleph

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Re: Remove all metal items before going to MR scan
« Reply #9 on: October 22, 2014, 11:03:11 pm »
Interesting. When people think "metal near magnets", they're usually thinking of ferromagnetic stuff (iron and iron alloys like steel being the most common example), which has a very strong response to magnetic fields. Bismuth is diamagnetic, which means that it's repelled by magnets rather than attracted to them, and that this response is, relatively speaking, very weak (for reference, water is diamagnetic. Not as much as bismuth, but still).

My point being that, metallic or not, bismuth is not going to react to the MRI like something made of steel would. Maybe its high diamagnetism means you get bad results or something.
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Offline Svata

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Re: Remove all metal items before going to MR scan
« Reply #10 on: October 22, 2014, 11:24:49 pm »
Or, being repelled from the sides, would either lift and/or tear through (if on side nearest magnet) whatever limb/part of your torso it was attached to.
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Offline chitoryu12

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Re: Remove all metal items before going to MR scan
« Reply #11 on: October 23, 2014, 12:36:58 am »
Or, being repelled from the sides, would either lift and/or tear through (if on side nearest magnet) whatever limb/part of your torso it was attached to.

Depends on the relative strength of everything. It's perfectly possible that any repelling strong enough to move the limb the bandage is attached to would simply tear the bandage off. And it could only go through the body if it was already dense or sharp enough to do so simply by being pushed hard enough (and cloth bandages with minor amounts of metal aren't exactly heavy weights).
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Offline Svata

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Re: Remove all metal items before going to MR scan
« Reply #12 on: October 23, 2014, 12:58:58 am »
Fair enough. It was just a guess based on what ferromagnetic things would di if pushed into the opposite direction.
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Offline Sigmaleph

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Re: Remove all metal items before going to MR scan
« Reply #13 on: October 23, 2014, 01:45:58 pm »
Or, being repelled from the sides, would either lift and/or tear through (if on side nearest magnet) whatever limb/part of your torso it was attached to.

The key thing is that diamagnetic effects are much weaker than ferro- ones, and even a strongly diamagnetic material like bismuth should only result in very weak forces. But it's not like I've done the math on it, so don't take my word for it.
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