QCT Method Promises to Give Much Précised Results In the Bone Density Measurement  

In the medical term, bone density denotes to the available matter per cubic centimeter of bones. This matter can be measured by several procedures known as densitometry that are often performed in the radiology or nuclear medicine departments. Densitometry methods like QCT bone density are painless and noninvasive measurements that involve minimal exposure of radiation. These measurements are commonly made over the lumber spine and over the upper part of the hip, and probably the bone density test is taken for the diagnosis of osteoporosis.

There are various types of tests and all are non-invasive. These tests include dual energy x-ray absorptiometry (DXA or DEXA), quantitative computed tomography (QCT), qualitative ultrasound, single photon absorptiometry, dual photon absorptiometry, digital x-ray radiogrammetry, and single energy x-ray absorptiometry (SEXA). The results are scored by two measures, the T-score and the Z-score. These scores indicate the amount of mineral density; negative scores show the lower bone density, whereas positive scores indicate higher amount of minerals.

Quantitative computed tomography (QCT) is one of the three methods cited by the National Osteoporosis Foundation. It is a safe and useful method for the evaluation of osteoporosis. Through this method, measurement can be assessed in the same way a cholesterol scaling is used for coronary heart disease or blood pressure for stroke. QCT and DEXA both can measure spinal bone mass in the peripheral skeleton where bone density is slow to change in response to disease therapy. Lateral DXA has been shown to have a sensitivity intermediate between the high sensitivity of QCT and somewhat lower one of traditional DXA for the detection of osteoporosis.  


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