Osteoporosis Evaluation W/QCT BMD

Quantitative Computed Tomography, or QCT Densitometry is a method used to measure bone mass. It is one of the three methods cited by the National Osteoporosis Foundation as useful and safe in the evaluation of osteoporosis. A QCT bone mass measurement is used to assess osteoporosis in the same way a cholesterol measurement is used for coronary heart disease or blood pressure for stroke.

The data are used to measure an important risk factor and determine the necessity, choice and efficacy of therapy. The principle underlying QCT Densitometry and other bone mass measurements (SPA, DPA, DXA/QDR) is that calcified tissue will absorb more X-RAYs than surrounding tissue so that the CT density measurement can be used to measure total bone mass within a sample of tissue.

The method used by Imaging Healthcare Specialists is the same one developed and used at the University of California, San Francisco, since 1978, using the same calibration phantom and scanning procedures. With proper technique, precision for the conventional (2D) method is 2-3%, and about 1% for 3D QCT scans, so monitoring patients at yearly intervals yields clinically useful results.


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