I think the issue with this and the proposed ‘spa’ scan model is that the diffs are usually meaningless. We all have cysts, masses, and weird shapes that shift around and show up on imaging. Many of these shapes require biopsy to determine what they are. Without symptoms the false positive rate is ridiculously high.

Modern medicine sort of requires us to suspend the idea that we can know everything happening in our body at any given time. If we could develop a diagnostic technique to instantly determine if shapes in our bodies are malignant or benign something like frequent full body scans could be interesting, but they really just introduce noise right now.

> - ... and now we give you another FBS every so-many years, and only those things that are different from the previous scan are investigated.

The diff can be meaningless as well. All sorts of benign things develop with age.

The resolution is the problem. You can't do the type of cytology and histology needed to understand all disease with just scans.