DEXA Scans and Bone Densitometry
The art and science of measuring bone mineral content and density of specific skeletal
sites/the whole body - answer What is bone densitometry?
-Assess bone strength
-Diagnose diseases associated with low bone density
-Monitor therapy
-Predict fracture risk - answer What is bone densitometry used for?
ionizing radiation, ultrasound - answer Current bone densitometry techniques use ____
or ___
Dual-energy xray absorptiometry (DXA) - answer What is the most common type of
bone densitometry?
Scanning at two different x-ray photon energies and mathematically manipulating the
recorded signal to take advantage of the differing attenuation properties of soft tissue
and bone at the two energies - answer What is dual-energy xray absorptiometry?
-Low radiation dose
-Readily available
-Simple to use
-Short scan time
-High resolution images
-Precise
-Stable calibration - answerWhat are the advantages of dual-energy xray
absorptiometry?
-1920: first xray that demonstrated osteoporosis
-1930s: first article on bone mass quantification
-1960s: bone loss in astronauts sparked radiogrammetry
-1970s: quantitative computed tomography (QCT) emerged
-1970s and 1980s: first dedicated bone densitometry unit
-1987: first commercial DXA scanner
-1990s: development of smaller, portable units for peripheral scans - answerWhat is the
timeline of dexa scans?
Process of old bone resorption and new bone formation - answerWhat is bone
remodeling?
resorption and formation processes, middle age - answerStable bone mass requires
equal ______ and is the most stable in _____
The art and science of measuring bone mineral content and density of specific skeletal
sites/the whole body - answer What is bone densitometry?
-Assess bone strength
-Diagnose diseases associated with low bone density
-Monitor therapy
-Predict fracture risk - answer What is bone densitometry used for?
ionizing radiation, ultrasound - answer Current bone densitometry techniques use ____
or ___
Dual-energy xray absorptiometry (DXA) - answer What is the most common type of
bone densitometry?
Scanning at two different x-ray photon energies and mathematically manipulating the
recorded signal to take advantage of the differing attenuation properties of soft tissue
and bone at the two energies - answer What is dual-energy xray absorptiometry?
-Low radiation dose
-Readily available
-Simple to use
-Short scan time
-High resolution images
-Precise
-Stable calibration - answerWhat are the advantages of dual-energy xray
absorptiometry?
-1920: first xray that demonstrated osteoporosis
-1930s: first article on bone mass quantification
-1960s: bone loss in astronauts sparked radiogrammetry
-1970s: quantitative computed tomography (QCT) emerged
-1970s and 1980s: first dedicated bone densitometry unit
-1987: first commercial DXA scanner
-1990s: development of smaller, portable units for peripheral scans - answerWhat is the
timeline of dexa scans?
Process of old bone resorption and new bone formation - answerWhat is bone
remodeling?
resorption and formation processes, middle age - answerStable bone mass requires
equal ______ and is the most stable in _____
