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Whole-body magnetic resonance imaging at 0.05 Tesla

science.org

131–140 of 159 posts

Re: Whole-body magnetic resonance imaging at 0.05 Tesla

#131
> applying machine learning to the output of a lower-power MRI device

So, we get worse SNR data from the device and then enhance it with compressed knowledge from millions of past MRI images? Isn't it like shooting the movie with Grandpa's 8mm camera and then enhancing and upscaling it like those folks on YouTube do with historical footage?

Re: Whole-body magnetic resonance imaging at 0.05 Tesla

#132

Earlier quoted context omitted.

I still remember the zoom and enhance joke they played on red dwarf. Parody has become reality.

Immortalized in Super Troopers (2001). https://youtu.be/KiqkclCJsZs

Also "Space Force" has an "Enhance!" scene:

https://www.youtube.com/watch?v=FVOydVwOO4M

Re: Whole-body magnetic resonance imaging at 0.05 Tesla

#133
post #120

That Science let this through peer review and editor filtering is pretty damning. This wouldn't pass 5 minutes of review here on Hacker News.

> This wouldn't pass 5 minutes of review here on Hacker News.

Neither did Dropbox.

Re: Whole-body magnetic resonance imaging at 0.05 Tesla

#134
Awkward, I was expecting to be reading an article about Tesla moving into the medical industry. Who's idea was it to name the unit of magnetic flux density after a car company? This is worse than that time I ended up reading an article about a shallow river crossing

Re: Whole-body magnetic resonance imaging at 0.05 Tesla

#135
post #117
post #90

Earlier quoted context omitted.

Some of us want a record of what was, not a hallucination of what might have or could have been. Courts, for example. Forensic science was revolutionized by widespread adoption of photography leading to a reduction of the importance given to witnesses. Who also hallucinate what might have happened.

Pretty much all modern digital cameras are using heuristics and algorithms to construct the image you see - it's not just a sensor grid and a bitmap file and it hasn't been for a long time.

There are differences of kind here.

The important property is how the pixels are correlated with the physical reality being imaged - because the goal is to reason and learn about the depicted subject though information in the photo. Heuristics and algorithms for demosaicing, white balance, auto-brightness/dynamic range, lens collection, removing motion blur, etc. improve the correlation or improve our ability to see it. This is fine, though you need to be aware at time which properties of the image are to be treated as relative vs. absolute.

This is also a far cry from having your camera think, "I'm a consumer camera! Normies often shoot pictures of the Moon, so this fuzzy circle must be it; let me paste a high-resolution photo of the Moon there", or "gee, normies often shoot sportsball, so this green thing must be astroturf, and this grey blob is probably the ball", etc.

Re: Whole-body magnetic resonance imaging at 0.05 Tesla

#136
post #87
post #51

Earlier quoted context omitted.

This is an excellent ponit, and I don't know where to exactly draw the line ("I know it when I see it"). I personally use "auto" (probably heuristic, maybe soon-ish AI-powered) features to adjust levels, color balance etc. Using AI to add things that are _not at all present_ in the original crossed the line into digital art vs photography for me.

There was the small complication of the fact that the moon texture that Samsung got caught putting onto moon-shaped objects in photos is, of course, the same side of the same moon.

Sort of, kind of, but not shot at the same time, and not at the same location.

I would object slightly less if they made a model (3D or AI) that captures the whole side of the Moon in high detail, and used that, combined with precise location and date/time, to guide resolving the blob in camera input into a high-resolution rendering *that matches, with high accuracy and precision, what the camera would actually see if it had better optics and sensor*. It still feels like faking things, but at least the goal would be to match reality as close as possible.

Re: Whole-body magnetic resonance imaging at 0.05 Tesla

#137
post #117
post #90

Earlier quoted context omitted.

Some of us want a record of what was, not a hallucination of what might have or could have been. Courts, for example. Forensic science was revolutionized by widespread adoption of photography leading to a reduction of the importance given to witnesses. Who also hallucinate what might have happened.

Pretty much all modern digital cameras are using heuristics and algorithms to construct the image you see - it's not just a sensor grid and a bitmap file and it hasn't been for a long time.

Big difference between a fancy interpolation algorithm that compiles to 500 bytes and another that takes many more orders of magnitude of space because it also contains data used to add details from what it thinks other similar photographs have

Re: Whole-body magnetic resonance imaging at 0.05 Tesla

#138
post #32

Earlier quoted context omitted.

> Imagine going to a restaurant, ordering French onion soup, and getting a bowl of brown food coloring in water. Welcome to England!

I still remember the zoom and enhance joke they played on red dwarf. Parody has become reality.

https://www.youtube.com/watch?v=EMBkWtDAPBY

Re: Whole-body magnetic resonance imaging at 0.05 Tesla

#139
post #87
post #51

Earlier quoted context omitted.

This is an excellent ponit, and I don't know where to exactly draw the line ("I know it when I see it"). I personally use "auto" (probably heuristic, maybe soon-ish AI-powered) features to adjust levels, color balance etc. Using AI to add things that are _not at all present_ in the original crossed the line into digital art vs photography for me.

There was the small complication of the fact that the moon texture that Samsung got caught putting onto moon-shaped objects in photos is, of course, the same side of the same moon.

> the moon texture that Samsung got caught putting onto moon-shaped objects in photos is, of course, the same side of the same moon.

Probably not exactly the same side and orientation. https://en.wikipedia.org/wiki/Libration#Lunar_libration: “over time, slightly more than half (about 59% in total) of the Moon's surface is seen from Earth due to libration”

Re: Whole-body magnetic resonance imaging at 0.05 Tesla

#140
post #24

A few months ago there were articles going around about how Samsung galaxy phones were upscaling images of the Moon using AI [0]. Essentially, the model was artificially adding landmarks and details based on its training set when the real image quality was too poor to make out details. Needless to say, AI upscaling as described in this article would be a nightmare for radiologists. 90% of radiology is confirming the…

The Samsung phone wasn’t a technological advancement, it was sheer fraud. A camera is supposed to take pictures of what it sees. Imagine going to a restaurant, ordering French onion soup, and getting a bowl of brown food coloring in water.

I wouldn't go that far to call it as a fraud, unless you call literally every phone-with-camera manufacturer these days a fraud. Then I agree as my trusty old nikon fullframe always catches only whats there, including noise and instability that modern phones handle easily.

People were commenting on that thread how apple phone ie mirrored only bunny within bigger picture of a bunny in the grass (thats rather hilarious 'bug'), and we all know how apple consistently removes all moles and wrinkles, changes completely skin tone and overall tonality like every single picture looks like its taken in the golden sunset hour. Ie that nasty samsung is much more truthful when it comes to this, including latest flagships.

That's outright lying too, IMHO much worse - moon is tidally locked so showing exactly same side with same features for millions of years, so they were adding details that are there, just impossible to see on non-stabilized tiny plastic lens&sensor combo in the night.

Making somebody 20 years younger, much prettier and changing their overall look on most important feature we humans have, doing it by default without any real option to turn it off, does a lot of long term body-perception damage in young folks.

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