G.P.G biomedical

Dual Energy X-ray Absorptiometry

Enrollment No. 136230303525AMAR PANDEY

What is DEXA Scanning?

DEXA scan is an instrument used to measure the densit used to measure the density of bones. DEXA stands for dual energy X-ray absorptiometry. It is now also called DXA scan.

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Osteoporosis

The bones in our skeleton are made of a thick outer shell and a strong inner mesh filled with collagen (protein), calcium salts and other minerals.

•Normal bone on left•Osteoporotic bone on right

T The inside looks like honeycomb, with blood vessels and bone marrow in the spaces between bone.

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Use x-ray beam which has two different averagex-ray energies• Measure attenuation at high and low energies• Calculate area density at each point by solvingtwo simultaneous equations• Calculate BMC, bone area and average BMD• No need to keep total thickness constant

Block Diagram Of Dexa

Application DXA scans are used primarily to evaluate bone

However, it has been suggested that, while very accurately measuring minerals and lean soft tissue (LST), DXA may provide skewed results as a result of its method of indirectly calculating fat mass by subtracting it from the LST and/or body cell mass (BCM) that DXA actually measures.

DXA scans are also used to assess adiposity in children, especially to conduct clinical research

mineral density.

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Advantages This method is precise, accurate, and reliable. DEXA measurements are based on a three compartmental model rather than two compartment as in most other methods. DEXA can also distinguish regional as well as whole body parameters of body composition. As such, it is considered a reference standard, and the latest body composition research uses this method.

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•The equipment is expensive, and often requires trained radiology personnel to operate.•It is so costly device.•We can’t do this on pregnant woman and small childs. •The diagnosis of using this device is so costly because of this poor people cant affort this treatment.

Disadvantages:

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