Also known as Dual energy X-ray Absorptiometry or DEXA, bone densitometry is the technology used to measure and monitor changes in bone density. The gradual loss of density weakens the bones and leads to fractures. This condition is called osteoporosis. Many factors such as dietary habits and family history contribute to the development of this disease. A bone densitometer can let patients know whether or not they have osteoporosis or if they are at risk for developing the disease.