Tissue density is quantified using shear wave information in medical ultrasound scanning. Measurements of the tissue reaction to shear waves indicate tissue density. For example, shear wave velocity is linked with density using clinical study information. The shear wave velocity in a region, over the entire tissue, or at various locations is used to determine a corresponding density or densities. The tissue density information is used for categorization, estimation of disease risk, imaging, diagnosis, or other uses. The tissue may be breast tissue or other tissue.
