this post was submitted on 30 Jul 2024
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Science Memes

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628
scan scam (mander.xyz)
submitted 2 months ago by [email protected] to c/[email protected]
19 comments fedilink hide all child comments
 
all 22 comments
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[–] yesman 77 points 2 months ago (3 children)

[–] [email protected] 21 points 2 months ago

Holy shit that is so wrong, and I am here for it.

[–] [email protected] 9 points 2 months ago (1 children)

Jesus Fucking Krist

[–] MehBlah 3 points 2 months ago

Turn left on to Kennedy blvd.

[–] BreadOven 33 points 2 months ago (1 children)

Having to look up MRA. It's just MRI (NMR) but with contrast that goes specifically to the brain (maybe carb-based)?

[–] [email protected] 16 points 2 months ago (1 children)

Magnetic Resonance Angiogram. Yeah it's an MRI. I guess they're processing it somehow to enhance bloodflow like FMRI. Seems like it doesn't require contrast.

[–] SacralPlexus 11 points 2 months ago (1 children)

Radiologist here. 👋🏻

You are right it does not require contrast. The scan uses a special technique to reduce signal from tissue that isn’t moving so only things that are moving produce high signal and show up “bright.” Since blood is the only thing really moving in the brain - voila!

[–] [email protected] 3 points 2 months ago (1 children)

Neat, I was thinking it was something like motion amplification. I guess the lungs would mess with imaging of the torso, or can you pick the motion frequency to isolate bloodflow but ignore respiration?

[–] SacralPlexus 5 points 2 months ago (1 children)

The lung motion is be a problem but it is still done in some situations and the radiologist just tries their best with any motion artifacts. Since the blood vessels are so big in the chest it kind of works out, but it turns out better with contrast.

[–] [email protected] 3 points 2 months ago

I see. I started reading this article which describes a whole host of different techniques. It really seems to be exploiting the physics of NMR to get this enhancement (or deficit), along with the image processing. It's really interesting but I'd need a while to get my head around it.

[–] Mango 20 points 2 months ago

Malady of the brain

[–] [email protected] 9 points 2 months ago (3 children)

Is it really an x-ray of the brain? Surely that's just of the skull.

[–] [email protected] 15 points 2 months ago

Technically it's both. It's just that the bones stand out much more than the soft squishy insides.

[–] [email protected] 7 points 2 months ago (1 children)

All of them are XYZ of the head,

[–] [email protected] 2 points 2 months ago

Nice

[–] [email protected] 4 points 2 months ago

There are brain x-rays called pneumoencephalographs where they replace the cerebrospinal fluid with air, x-ray, and then put the fluid back. Pneumoencephalography and angiography were really the only neuroimaging techniques available for most of the 20th century, so it was pretty common.

[–] [email protected] 8 points 2 months ago

Does the brain belong to Vince McMahon?

[–] [email protected] 4 points 2 months ago

It's the perfect antimeme

[–] [email protected] 3 points 2 months ago

I love it!