Typically, a CT is done to remeasure tumor(s) to see if/how much chemo has caused it/them to shrink.

Thank you Nancyjac - your answer here and to all other questions have been informative and practical.

They can use it to take a peek at what's happening with your tumor(s), for better or worse, to help assess the efficacy of your treatments, see what you're dealing with at this point in time, and help make decisions on where to go from here.

http://imaging.cancer.gov/patientsandproviders/cancerimaging/ctscans
http://www.cancer.gov/cancertopics/pdq/treatment/pancreatic/Patient/page1/AllPages

Were they giving you Gemzar for all your chemo?
Good luck with your results.

I had a CT scan on the last lymph nodes that came swelling up in my neck. Was told by my primary care dr. thats all he would need to decide to do a biopsy. (I wanted the biopsy right now) After the scan, the reading from the radiology dept. said it was "non impressive". Then we done the biopsy, turned out to be malignant. The scan is helpful, I've had a ton of them,but not the final word sometimes. but it does great showing how the tumors shrink.

my husband, who just finished treatments is scheduled to have a CT scan every 3 months to monitor for tumor growth or swelling. hopefully, he won't have any of that, and hopefully yours too will be good results