Sorry to hear about your father. That is difficult, particularly on such a short timeline.
Though many of the other comments here are focused on the negative consequences of doing full body scans, I believe they are thinking about full body MRI and other tests using only today's technology.
They are correct, we can't or maybe I should say probably shouldn't give a doctor a full MRI and say "what do you see that might need to be addressed", however, we should be able to train an AI to say "look at this scan, is there anything that you would recommend the doctor take a closer look at".
This should probably be done in conjunction with blood work, and maybe even genetic testing, etc.
A doctor looking for something wrong has a TON of things to look at, and interactions between them, what other patients have had issues recently that might lead them in one direction or another due to their experience.
An AI can likely be trained to take a less biased, or perhaps more appropriately biased look at significantly more data than a person, and make recommendations to the expert doctor of what the AI suggests would be beneficial to look at.