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Scott Alexander's avatar

I don't think I dismissed the idea of doing incremental scans and taking the difference "out of hand". My point is that this is priced into everyone's discussions of how useful this is. "Doing a scan twice" isn't some kind of insane technological leap that it took an AI company to think of. Existing whole body MRIs are often done yearly. The reason this doesn't help much is that dangerous things aren't particularly well-distinguished from benign things based on how new they are or how quickly they grow (or rather, the degree to which they are is already included in the calculations I gave earlier).

Chris's avatar
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The amount of coverage the Midjourney scanner is getting is just bizarre. New imaging modalities are invented not infrequently, however, almost none of them make it past the lab. The current suite of medical imaging tools are actually very good, and while it's possible to beat them on one or two metrics, it's hard to do better as a whole. Not impossible, but you should treat announcements about revolutionizing medical imaging at the same level of credence as claims to have found a cure for cancer based on results in mice.

The real story here is that Midjourney failed as an AI company. They are no longer a top contender among image generation models (ranked #81 on artificial analysis, which is even worse than I thought). And they are trying to pivot as a last ditch attempt to get more funding.

As for specific reasons to think this will fail - the biggest issue is that the images on their website are completely non diagnostic. You can't claim to revolutionize imaging until you can actually produce useable images. Preferably with some clinical data to show that it can pick up pathology prospectively.

More specific reasons to think Ultrasound tomography won't work very well - sound waves scatter more than X-rays. The further away the target, the more noise gets introduced. Which is why ultrasound is traditionally a targeted modality - you place the scanner directly next to the area of concern. Ultrasound also doesn't penetrate bone very well. You can get a signal via full wave inversion, but so much of the sound waves are attenuated that you get a very noisy image that has so far not been clinically useful.

And on the point of harms from whole body screening, you're missing two things. The first is the third part payer problem - people aren't bearing the costs of screening and intervention - those costs are distributed, leading to a tragedy of the commons. If costs were totally out of pocket then sure this wouldn't be an issue. But second - lawsuits. A physician can decide not to intervene on findings that are 90% likely to be irrelevant. But in the remaining 10% of cases, there is potential for getting sued.

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