Is it Safe to Get an MRI?

http://www.titojankowski.com/is-it-safe-to-get-an-mri

by titojankowski • 13 years ago

4 9 13 years ago

PaulHoule• 13 years ago

I think the real risk is that your radiologist might get a false positive condition that leads to you getting a dangerous procedure you don't need.

titojankowski4• 13 years ago

Oh yea, that's a great one, I'll add it to the list!

titojankowski4• 13 years ago

Getting an MRI without a medical reason has an extra risk. If you and your radiologist/doctor aren't focused on a "problem area", you might just find one anyway. Here's story in the New York Times about a person who went in for a CT Scan for stomach pains, but ended up "discovering" a harmless lump in her adrenal mass. Of course, it cost more than a thousand dollars of further testing to declare it "benign". Surely I have some artery that “looks constricted” or an “abscess” to fret about. I'd say this is the biggest risk for me getting an MRI "just for the data".

Because of this, I'm considering skipping the analysis after the scan. Just save the file to Google Drive and get another scan to compare to in 5 or 10 years.

http://well.blogs.nytimes.com/2013/01/17/the-fallout-of-a-ch...

Updated the post to include this section

ozh• 13 years ago

there's an M in MRI (for "Magnetic") just because "Nuclear" didn't have the same harmless ring to it.

This is not something to do for fun.

titojankowski4• 13 years ago

Any particular risks you're alluding to?

pasbesoin• 13 years ago

While I'm not in a position to assess the risks, and unintended side-effects have been documented, e.g. unexpected elevation of mood in subjects receiving cranial MRI, I will note that the "nuclear" in NMR, of which MRI is an off-shoot/specialization, refers to the structure being imaged rather than to a nuclear reaction with the latter's attendant risks.

I remember when this technology was "up and coming" and "NMR" was the term/acronym. I wondered a bit when "MRI" started cropping up; perhaps you are right that "nuclear" was a bit scary for the general/patient population.

https://en.wikipedia.org/wiki/Nuclear_magnetic_resonance

https://en.wikipedia.org/wiki/Magnetic_resonance_imaging

dialmaster• 13 years ago

Well, then at least you'll have it.

code_diego_code• 13 years ago

I'm a former NMR spectroscopist (a chemist who works with the same technology as MRI devices--though at even higher magnetic field strengths to in order to study the shapes of various molecules). I've quite spent a lot of time working around high-field superconducting NMRs without incident.

To clarify the the "nuclear" part, magnetic resonance technology does not in any way involve nuclear reactions or the ensuing radiation from such, so you can rest easy on that one.

Additionally, MRI also doesn't utilize any ionizing radiation in the scanning process. This is one of the major advantages of imaging via MRI technology as opposed to using x-rays in traditional radiography or newer CT technologies.

What happens in NMR is that certain atomic nuclei like to align themselves with the magnetic field that they happen to find themselves in, much in the same way that you might see iron filings on a piece of paper aligning themselves with the magnetic field lines created by a toy magnet. This is where we get the M, or magnetic, part of MRI.

When these aligned nuclei are then exposed to radio waves, they will absorb and slightly later, re-emit the signal at specific resonance frequencies. This is where the R in MRI comes from. Now the trick is that the exact frequency where this happens depends on how the electrons surrounding that nucleus are arranged (which is mainly a function of what other atoms might be bonded to the one yu're looking at).

The timing and frequency at which this radio re-emission occurs allows chemists and radiologists to determine various bits of information about the different environments that these particular atoms have found themselves in, making it a very useful tool for determining chemical properties or non-invasively taking pictures of the interior of people's bodies.

Around very high-field magnets (particularly the superconducting types used in research NMR spectrometers and high-resolution closed tube MRI scanners), however, you do need to be careful about the magnets--and what ferromagnetic objects you may be bringing near or into them and how the field may affect them.

I trust most MRI techs and spectroscopists understand the proper safety procedures around their machines well enough to not allow themselves or their patients to create hazardous situations involving the magnets. These are some delicate and very expensive machines. That being said, failures can be quite spectacular--imagine Magneto and Iceman having a battle royale in your lab.

I think this is quite enough for one post, I'll leave the medical risks involving contrast dyes and incidentalomas to those more knowledgeable than myself.

titojankowski4• 13 years ago

Cool, thanks for sharing your experience! OK if I repost this comment on my blog? (Or maybe you want to repost it yourself?)

Thanks! Looking forwards to writing more about this.

Tito

Is it Safe to Get an MRI?

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