Bone Densitometry Questions and Answers Fully Solved 100%
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Bone Densitometry
Institution
Bone Densitometry
primary osteoporosis - ️️Type I - postmenopausal
* caused by bone resorption exceeding bone formation -> estrogen deprivation in
women
Type II - senile or age related
* occurs in aging men & women from decreased ability to build bone
History - ️️1930's - 1st pub. for interest in bon...
Bone Densitometry
primary osteoporosis - ✔️✔️Type I - postmenopausal
* caused by bone resorption exceeding bone formation -> estrogen deprivation in
women
Type II - senile or age related
* occurs in aging men & women from decreased ability to build bone
History - ✔️✔️1930's - 1st pub. for interest in bone mass quantification (pioneering
work done in dentistry)
* Radiogammetry - introduced in 1960's; bone lose in astronauts
1970's - CT; quantitative measurement of vertebral body, Quantitative Computed
Tomography (QCT)
- 1st scanners dedicated to bone densitometry 70's & 80's
1987 - 1st commercial DXA scanner introduced
1988 - Bone Mass Measurement Act (BMMA) - reimb. for medicare pts
1990's - smaller, more portable, less complex tecniques for measuring the peripheral
skeleton
Bone measurement values - ✔️✔️used to assess bone strength, assist w/ diagnosis of
diseases assoc. w. low bone density (osteoporosis), monitor the effects of therapy for
such diseases, and predict risk of future fractures
Dual energy x-ray absorptiometry (DXA) - ✔️✔️low rad dose, wide availability, ease of
use, short scan time, high-resolution images, good precision & stable calibration
* subtraction technique - eliminate contributions of soft tissue & measure x-ray
attenuation of only bone
Bone densitometry - ✔️✔️art & science of measuring the bone mineral content (BMC)
& bone mineral density (BMD) of specific skeletal sites or the whole abody
bone remodeling process - ✔️✔️equivalent of a new skeleton is formed about every 7
years
peak bone mass - ✔️✔️reached at approx. 20 - 30 years of age;
middle age is a stable period
decreasing bone mass begins @ approx. 50 yrs. in women & 65 yrs. in men
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