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The information you can get from light miscroscope images is quite limited though.

On the other hand, maybe it would be enough to filter out every cell that is not identified as a blood cell. This should be an easier task.

Probably we could direct only a small part of blood into this filtering machine at a time. Sounds like it would be still more like a machine detecting if there are cancer cells present in the bloodsteam rather than a machine eliminating metastasization.

I think the "cure cancer without biology" approach makes somewhat sense (I assume you would still need some biology :) ). Don't many surgeries already fall into this category? Let's say we made an automated colonoscopic machine that scanned the whole intestine and destroyed all abnormal colonic crypts. Now if this machine worked well, you would essentially cure at least those colon cancers that go through some aberrant crypt stage.