In 1984, Image Analysis introduced the first commercial QCT bone densitometry product. We have remained the leaders in CT bone densitometry while providing calibration phantoms and software for key bone density research, drug evaluations and more recently large multi-center calcium scoring studies. From the earliest commercial offering of QCT systems, Image Analysis has lead with significant software and phantom advancements. Currently our solid calcium hydroxyapatite phantoms and highly automated software with 3-D imaging processing, CT scanner standardization, solid QA-Torso phantom and techniques insure consistent performance, whether in a small hospital or a large multi-center study.