CTs are uncommon in family medicine offices. They'd need to forfeit square feet that could otherwise be used for several exam rooms. The offices that do have them probably opt for really low-end ones. So "never"?
As an aside, I think GPs (General Practitioners) are probably phasing out a bit in favor of Physician Assistants and Nurse Practitioners. Though "Family Medicine" still employs lots of MDs.
When said GP has a few million to spend on stuff like this. And when they're no longer needed to send 80% of people home because they have the sniffles and need a doctor to tell them it's just a cold instead of ebola. (Because that's what GP's do in a lot of cases - deal with people who think they've got something worth going to a doctor for).
Yeah, my mom (who is a doctor) was just complaining about this, when she just started out she was a GP in pediatrics and said that 95% of cases were the common cold + over reacting parent, it made it much more difficult to find the interesting cases (read: actually sick kids who needed real treatment), she now works in ICUs and ERs and loves every minute.
As an aside, I think GPs (General Practitioners) are probably phasing out a bit in favor of Physician Assistants and Nurse Practitioners. Though "Family Medicine" still employs lots of MDs.