My partner and I purchased a dedicated ultrasound unit 2 years ago and use it as you do--90% breast, 5-7% thyroid, and 3-5% miscelaneous. We, too, have only a 7.5 MH transducer, but find it very adequate. Our unit is made by Acoustic Imaging and has proven to be very dependable and reliable. We have not had to have a single service call except for the power cord which became frayed, and it was repaired easily for $30. We can't imagine a breast practice without our own ultrasound. We diagnose about 80% of our breast cancers in our office at the first office visit with US assisted needle biopsy (FNA and Core). Our patients love it and we love it. I'm sure the insurance companies also love it, but we get no "points" for saving them many $. We also do many "no charge" ultrasound examinations. We don't charge if a patient comes to the office with an ultrasound in hand, although it is worthless to us. We don't feel right in charging again, so we do our procedure for free. We do charge for the biopsy, if we do it. It is my opinion that primary care physicians should not send patients to radiologists for ultrasound exams unless the radiologists are skilled at interventional ultrasound procedures. It makes no sense to get an ultrasound exam by a technologist, have it interpreted by a radiologist at great expense, then send the patient to a surgeon. The surgeon should be prepared to use his or her knowledge of breast disease to use ultrasound appropriately in the office setting. This would avoid unnecessary duplication of services and, more importantly, do what is most appropriate and convenient for our patients!