the amount of radiation involved in a ct scan would not justify the use as a screening test for the general population. it would probably cause more cancer than it would find. there are very specific symptoms and signs that would indicate an intracranial problem so it would be best to screen these patients first with a neurological exam rather than just recommending that all people get a brain ct scan. just like a pap smear or mammogram.
should people get "regular" ct scans (or some other head scan) to check for tumors in the brain (before its too late). i just feel that diagnosing/finding tumors early in the process of formation is the best way to prevent serious damage and i understand that tumor growth would exhibit certain symptoms but it is possible that people under high stress/anxiety may think its just because of their lifestyle when in fact there may be a more serious underlying issue. also tumor growth in brain regions that control personality (ie. how outgoing you are being socially awkward etc) may be harder to call a symptom