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19 Cards in this Set
- Front
- Back
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DXA
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Dual energy x-ray absorptiometry
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SXA
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single energy x-ray absorptiometry
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RA
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radiographic absorptiometry
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QCT
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quantitative CT
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Does bone densitometry reveal the cause of bone loss?
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NO
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What principle is BMD based on?
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Bone absorbs photons generated by the tube in proportion to the calcium density in the bone
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How is BMD calculated
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A numerical value is obtained by computing the difference in #'s of photons entering and emerging from the body part imaged
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How does QCT measure BMD
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uses calibration phantom and software to measure VERTEBRAL BMD
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which method provides true 3D measurements?
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QCT
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What yields the highest diagnostic accuracy for detection?
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Trabecular
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Pure trabecular yields highest accuracy for what part?
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low VERTEBRAL
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Which method calculates BMD after subtracting the soft tissue absorption?
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DXA
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What sites can DXA measure?
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Central skeletal, Hip, Spine
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How does SXA account for soft tissue?
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Body part is immersed in water bath to simulate uniform soft tissue thickness
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Where is SXA used?
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Distal skeletal sites
heel, forearm |
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What part does RA use?
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Fingers
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Which method uses an aluminum step wedge?
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RA
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What does the software average in RA?
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BMD of middle phalanges of 2,3,4th digits
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What can BMD tell you?
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Detect low bone mass
Predict chance of future fractures Confirm a Dx Distinguish osteoporosis fracture from other spinal abnormalities Monitor effects of treatment |
