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19 Cards in this Set

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