Alternative breast exams

I've heard of Breast Thermographic and Breast Ultrasonic examinations, but curious as to how either of these are performed. My wife has full, heavy breasts with dense tissue, and I imagine her to be a candidate for some additional types of screening. Does anyone have experience with these types of procedures?

There is also a new test which is like a breast pumps which are attached to your breast. It tries to get fluid from the nipples. The fluid (if any) is then sampled. The obgyn from the TV shot The Doctor's had an episode with one. It is on youtube somewhere.

I believe these are diagnostic tests, not a replacement for screening done by palpation. Technology can't replace human interaction.