Spread To Liver - Ct Scan Shows

My husband has tumour removed in the rectum and went through chemo and radiotheraphy for 6 months. That was 2nd half of Yr 2004. This May, a CT scan revealed that there are nodules in the liver and the small intestine is distended.
The oncologist suggested that the small intestine is blocked by tumours (99% sure) and there is secondary spread in the liver.
Upon surgery, was found that the distended small intestine is due to blockages in the upper part of the rectum, caused by the previous surgery.
Just how accurate is CT scan to determine that the nodules in the liver is cancer spread?
Anyone can advise?

My husband also had a rectal tumor removed in Feb 2003, they found mets to his lungs through a PET Scan May of this year 2005. It is all pretty scary but you will find a strength that you did not know you had to get your husband and yourself through this tough time. I would request a PET Scan. My prayers are with you and your husband, as I know how tough it can be, but remain positive and enjoy each day