I was diagnosed with NHL follicular Lymphoma in 2007. I am just wondering if I really need to have a scan.

Dear Dr. Jag, I was diagnosed with NHL follicular Lymphoma in 2007. I had R-CHOP and my scans have been clear since then. My last scan was in July of 2009. I thought my Dr. would do another scan in a year...but 6 months after my last scan...he mentioned he wanted to do a bone marrow biopsy. I thought was kind of odd. He did not offer a reason he wanted to do it...but then saw how nervous it made me and he said that we could just wait. 3 months later...he brought back up the bone marrow biopsy again. I had the biopsy done...and it showed no signs of Lymphoma. I am just wondering if I really need to have a scan. I know you can have Lymphoma WITHOUT marrow involvement...so that worries me. Thanks for any suggestions! Sincerely, Kim