CT Scan of chest question

Is there such a thing as "too much contrast" when a CT Scan of the chest is done? I'm asking because when I had one done in June, the nurse who was with me (I was on a constant heart monitor and had to have a nurse with me if I left the ward) said he was disgusted that the technician had injected so much contrast flui into me, and that the technician had seemed like she was too rushed and injected too much by accident.
Would more contrast show a different result to the right amount? Would it be more beneficial for the diagnosis, or would it not make any difference?
Thanks in advance for your assistance.

[Darcy Green Conaway, MD]

The main issue with receiving too much contrast is that it can damage your kidneys-- usually it is transient and resolves but can be a problem, especially if your kidneys were not normal before the test. Usually the technicians won't proceed with a CT without making sure your kidney function is normal. More contrast won't necessarily change the result, it is just an unnecessary risk.