Apple's iPhone 7 Plus decided to add another lense to be able to make better pictures. Meanwhile Walabot who started with wanting to build a breast cancer detection technology released a 600$ device that can look 10cm into walls. Thermal imaging also got cheaper.
I think it would be possible to build a 1500$ device that could combine those technologies and also add a laser that can shift color. A device like this could bring medicine forward a lot.
A lot of area's besides medicine could likely also profit from a relatively cheap 3D scanner that can look inside objects.
Developing it would require Musk-level capital investments but I think it would advance medicine a lot if a company would both provide the hardware and develop software to make the best job possible at body scanning.
These studies cost tens or hundreds of millions of dollars, take months or years to run, and then the process of getting the FDA to approve your product takes more millions of dollars and more years. At the end you have approval for a particular product for a particular purpose, and if you want to launch v2.0 or to use the product's measurements in a new kind of analysis for a new disease, you need to go through the approval process again.
This is entirely incompatible with quickly evolving technology in a market with many small / new players trying out various ideas. You end up with only a company the size of Apple being able to launch an Apple Watch, and even then it only being able to tell you your heartrate.
If the Apple Watch had advanced sensors for e.g. blood spectroscopy, and people could write programs that would tell you your blood sugar rates, and other people would write apps to tell if you had diabetes or advise you on insulin dosage, and people could side-load these apps without going through the Apple Store (maybe Android would be more appropriate), do you think the FDA wouldn't step in?
The FDA might shut down the independent App developers but I don't think the would shut down the Apple Watch for being able to run those Apps.
I don't think a breast cancer screening study would cost hundreds of millions. You could go to a hospital that does breast cancer screening and let every patient scan themselves with a device while they are in the dressing room.
Then you can gather the statistics of whether the software can reliably produce the same diagnosis as the existing technology.
Yes. Especially at the beginning you would have most of the software being developed by the company who sells the device. Business wise that means it might be very worthwhile for a company who develops this technology because they might have a monopoly on the marketplace.