Instead of casting a net of unknown quality every month, comparing against a null dataset (there does not exist a large dataset of these scans with outcomes for given markers).
Why not advocate cheap, easy blood/urine tests with higher frequency? Those tests do have large reference datasets with outcomes. And they have prescriptive value: there is likely more benefit to catching hypertension or diabetes earlier in more people.
Personally, I think you've swallowed some kind of health insurance industry black pill, whether you know it or not.
I don't need to, I've lived in Japan and done the Ippan Kenshin which is the once a year health checkup. It consists of getting your weight, height blood pressure measured, an eye test, urine tests for diabetes and a blood test for cholesterol. That's very reasonable.
The one thing some doctors still tend to do is a chest-xray, which is not reasonable. They do it because tuberculosis was widespread in post-war Japan and they just kept doing it, but it has no positive impact on mortality rates.