BONE DENSITOMETRY CHA.19 QUESTIONS & ANSWERS
What is bone densitometry? - Answer -general term that encompasses the art and
science of measuring the bone mineral content (BMC) and bone mineral density (BMD)
of specific skeletal sites or the whole body
What are the bone measurement values used for? - Answer -assess bone strength
assist with diagnosis of diseases
associated with low bone density
monitor effects of therapy for such diseases
predict risk of future fractures
What are the two techniques used to perform bone densitometry? - Answer -ionizing
radiation and ultrasound
What is the most widely used to measure bone density? - Answer -dual energy x-ray
absorptiometry
What is the advantage of DXA? - Answer -low radiation dose
short scan time
high resolution images
good precision
stable calibration
What is the differences between DXA and conventional radiography? - Answer --DXA
can be conceptualized as a subtraction technique
-bone density results are computed by proprietary software from the x-ray attenuation
pattern striking the detector, not from the scan image
-conventional, the x-ray machines vary from different manufacturers are operated in
essentially the same manner and produce identical images
-DXA radiation dose is lower than conventional radiography
When was osteoporosis first discovered? - Answer -1920s
What is radiographic absorptiometry? - Answer -taking a radiograph of bone with a
known standard, placing it in the ROI, and optically comparing densities
When was radiogrammetry introduced? - Answer -1960s
What technique enables quantitative measurement of the central area of the vertebral
body, where early bone loss occurs? - Answer -quantitative computed tomography
What were the first dedicated scanners dedicated to bone densitometry? - Answer -
single photon absorptiometry (SPA) and dual photon absorptiometry
What is bone densitometry? - Answer -general term that encompasses the art and
science of measuring the bone mineral content (BMC) and bone mineral density (BMD)
of specific skeletal sites or the whole body
What are the bone measurement values used for? - Answer -assess bone strength
assist with diagnosis of diseases
associated with low bone density
monitor effects of therapy for such diseases
predict risk of future fractures
What are the two techniques used to perform bone densitometry? - Answer -ionizing
radiation and ultrasound
What is the most widely used to measure bone density? - Answer -dual energy x-ray
absorptiometry
What is the advantage of DXA? - Answer -low radiation dose
short scan time
high resolution images
good precision
stable calibration
What is the differences between DXA and conventional radiography? - Answer --DXA
can be conceptualized as a subtraction technique
-bone density results are computed by proprietary software from the x-ray attenuation
pattern striking the detector, not from the scan image
-conventional, the x-ray machines vary from different manufacturers are operated in
essentially the same manner and produce identical images
-DXA radiation dose is lower than conventional radiography
When was osteoporosis first discovered? - Answer -1920s
What is radiographic absorptiometry? - Answer -taking a radiograph of bone with a
known standard, placing it in the ROI, and optically comparing densities
When was radiogrammetry introduced? - Answer -1960s
What technique enables quantitative measurement of the central area of the vertebral
body, where early bone loss occurs? - Answer -quantitative computed tomography
What were the first dedicated scanners dedicated to bone densitometry? - Answer -
single photon absorptiometry (SPA) and dual photon absorptiometry
