An Osteo CT or quantitative computed tomography (QCT) is used to measure bone mineral density (BMD). The high contrast discrimination of computed tomography can be used to examine the central skeleton for osteoporosis. Common CT scanners require a standard of reference to properly perform quantitative tissue analysis.
Osteo CT is the most accurate bone densitometry study, but is not widely available and delivers more radiation to the patient than dual energy x-ray absorptiometry.

Oxilan® is a radiographic contrast agent used in diagnostic imaging studies. The degree of contrast enhancement is directly related to the iodine content in the administered dose. Dependent on the iodine content, the osmolalities are 2.1 or 2.4 times that of plasma (285 mOsm/kg water).