Not sure what screening tests to do now

[m b]

Have just reached my 1 yr anniv of being dx. I just had mamogram (right side) & chest x-ray (left side). My oncologist doesn't usually do annual bone scans or cat scans post treatment unless there is some symptoms to warrant them. One of the reasons is sometimes they can give you false positive. If the cancer does spread I just think it would be best to try and catch it early. Does anyone have annual catscans or MRI's to ck for brain mets? Thanks for your thoughts.

Dx 2/05 41years
ER+ / Her2 +
6/9 nodes positive
Lumpectomy 3/05
AC/Taxol
Masectomy 7/05
33 rads
Herceptin
Tomoxifin