 The investigators have studied the potential of breast computed tomography bCT for breast imaging under an NIH-funded Biomedical Research Partnership BRP grant R01 EB002138-10, and 4 breast CT scanners have been developed that have imaged over 600 women to date under more than one IRB-approved protocol. The BRP grant cannot be renewed, and with this resubmitted R01 grant application, the investigators seek to finalize the investigators research in breast CT - The specific aims have been significantly modified as a result of the first critique, and the investigators now focus on a narrower set of remaining issues. 