Bone Densitometry || with Detailed Solutions.
bone densitometry correct answers a general term that encompasses the art and science of
measuring the bone mineral content and the bone mineral density of specific skeletal sites or the
whole body
bone mineral content correct answers BMC
bone mineral density correct answers BMD
bone strength
assist with diagnosis of diseases associated with low bone density
monitor the effects of therapy for such diseases, and predict risk of future fractures correct
answers what four things are the bone measurement values used to assess
dual energy X-ray absorptiometry correct answers what is the most versatile and widely used
technique to perform bone densitometry
dual energy X-ray absoprtiometry correct answers DXA
low radiation dose
wide availability
ease of use
short scan time
high resolution images
good precision
stable calibration correct answers advantages to DXA
subtraction technique correct answers DXA can be conceptualized as a _____ technique
region of interest correct answers ROI
lower correct answers the effective radiation dose for DXA is considerably ____ than that of
conventional radiography
Radiographic absorptiometry correct answers this involved taking a radiograph of bone with a
known standard, placing it in the ROI, and optically comparing the densities.
late 1970s correct answers when did CT emerge
quantitative computed tomography correct answers QCT
quantitative computed tomography correct answers QCT; bone density measure, more expensive
than DXA; sensitive to vertebral changes & has more radiation
single photon absorptiometry correct answers SPA
, single photon absorptiometry correct answers this was based on physical principles similar to
those for DXA and was not a subtraction technique but relied on a water bath or other medium to
eliminate the effects of soft tissue
dual photon absorptiometry correct answers DPA
dual photon absorptiometry correct answers a measure of bone density that measures the amount
of radiation absorbed by the bones
1987 correct answers in what year was the first commercial DXA scanner introduced
pencil-beam collimation correct answers Dual energy x-ray absorptiometry system using a
circular pinhole x-ray collimator that produces a narrow x-ray stream, which is received by a
single detector. Its motion is serpentine (or raster) across or along the length of the body. Modern
systems have improved scan time and image quality. Off-centering of the object does not cause
geometric distortion.
array-beam collimation correct answers Dual energy x-ray absorptiometry system that uses a
narrow "slit" x-ray collimator and a multielement detector. The motion is in one direction only,
which greatly reduces scan time and permits supine lateral spine scans. It introduces a slight
geometric distortion at the outer edges, which necessitates careful centering of the object of
interest.
hip and spine correct answers DXA of the ___ and ____ is still the most widely accepted method
for measuring bone density
support
manufactures red blood cells
stores minerals necessary for life correct answers what are the three functions of the skeleton
cortical and trabecular correct answers what are the two basic types of bones
compact correct answers what is another term for cortical bone
cancellous correct answers what is another term for trabecular bone
cortical correct answers what type of bone forms the dense, compact outer shell of all bones and
the shafts of the long bones
80 correct answers the cortical bone supports weight, resists bending and twisting, and accounts
for about __% of the skeletal mass.
spine
hip
calcaneus
bone densitometry correct answers a general term that encompasses the art and science of
measuring the bone mineral content and the bone mineral density of specific skeletal sites or the
whole body
bone mineral content correct answers BMC
bone mineral density correct answers BMD
bone strength
assist with diagnosis of diseases associated with low bone density
monitor the effects of therapy for such diseases, and predict risk of future fractures correct
answers what four things are the bone measurement values used to assess
dual energy X-ray absorptiometry correct answers what is the most versatile and widely used
technique to perform bone densitometry
dual energy X-ray absoprtiometry correct answers DXA
low radiation dose
wide availability
ease of use
short scan time
high resolution images
good precision
stable calibration correct answers advantages to DXA
subtraction technique correct answers DXA can be conceptualized as a _____ technique
region of interest correct answers ROI
lower correct answers the effective radiation dose for DXA is considerably ____ than that of
conventional radiography
Radiographic absorptiometry correct answers this involved taking a radiograph of bone with a
known standard, placing it in the ROI, and optically comparing the densities.
late 1970s correct answers when did CT emerge
quantitative computed tomography correct answers QCT
quantitative computed tomography correct answers QCT; bone density measure, more expensive
than DXA; sensitive to vertebral changes & has more radiation
single photon absorptiometry correct answers SPA
, single photon absorptiometry correct answers this was based on physical principles similar to
those for DXA and was not a subtraction technique but relied on a water bath or other medium to
eliminate the effects of soft tissue
dual photon absorptiometry correct answers DPA
dual photon absorptiometry correct answers a measure of bone density that measures the amount
of radiation absorbed by the bones
1987 correct answers in what year was the first commercial DXA scanner introduced
pencil-beam collimation correct answers Dual energy x-ray absorptiometry system using a
circular pinhole x-ray collimator that produces a narrow x-ray stream, which is received by a
single detector. Its motion is serpentine (or raster) across or along the length of the body. Modern
systems have improved scan time and image quality. Off-centering of the object does not cause
geometric distortion.
array-beam collimation correct answers Dual energy x-ray absorptiometry system that uses a
narrow "slit" x-ray collimator and a multielement detector. The motion is in one direction only,
which greatly reduces scan time and permits supine lateral spine scans. It introduces a slight
geometric distortion at the outer edges, which necessitates careful centering of the object of
interest.
hip and spine correct answers DXA of the ___ and ____ is still the most widely accepted method
for measuring bone density
support
manufactures red blood cells
stores minerals necessary for life correct answers what are the three functions of the skeleton
cortical and trabecular correct answers what are the two basic types of bones
compact correct answers what is another term for cortical bone
cancellous correct answers what is another term for trabecular bone
cortical correct answers what type of bone forms the dense, compact outer shell of all bones and
the shafts of the long bones
80 correct answers the cortical bone supports weight, resists bending and twisting, and accounts
for about __% of the skeletal mass.
spine
hip
calcaneus
