You need to read those things literally. It doesn't mean CT scans should be used whenever a doctor thinks. It means that a doctor evaluating a TBI should be ok

You need to read those things literally. It doesn't mean CT scans should be used whenever a doctor thinks. It means that a doctor evaluating a TBI should be ok with using it. Basically, the odds switch when there is an additional symptom that there is something wrong with the head.