DXA EXAM QUESTIONS 100% VERIFIED
ANSWERS.
What is the current standard of care for osteoporosis detection - ANSWERSDXA
What does DXA stand for - ANSWERSdual x-ray absorptometry
80% of human skeletal mass is made up of what kind of bone - ANSWERScompact
bone (cortical)
What do osteoclast do - ANSWERS- large cells that dissolve bone
- responsible for reabsorption
What do osteoblast do - ANSWERS- cells that form new bone
- responsible for formation
What is osteoporosis - ANSWERS- porous bone
- is a disease in which the density and quality of bone are reduce
- low bone mass and deterioration of bone tissue
- increase bone fragility
Name some risk factors for osteoporosis - ANSWERS- female gender
- Caucasian or Asian race
- thin and small bony frames
- family history
- smoking
- lack of exercise
- diet low in calcium
- poor nutrition and poor general health
Which fractures have the highest degree of morbidity and mortality - ANSWERShip
fractures
What does DXA scanning measure - ANSWERSbone mass in the hip, forearm or spine
What does DXA scanning compare an individuals BMD to - ANSWERScompare to
individual with peak bone mass in your 20's (Tscore) and an overage person of the
same age (Zscore)
What is a persons T score - ANSWERS- a comparison of persons bone density
- widely used parameter to interpret BMD
- marks how far BMD deviates from a sex matched young adult peak bone mass
(amount of bony tissue at end of skeletal maturation in your 20's)
, What is a person's Z score - ANSWERS- comparison of a person's bone density with
that of an average person of the same age and sex
- reference population matched by patients age (age less than 50)
What are some common anatomical structures measured in DXA scanning -
ANSWERShip, spine, forearm (bone compartments
What is the proper patient positioning for DXA of the hip - ANSWERSpatient is supine
with the leg in a 15-25 degree internal rotation
Why do we scan the spine - ANSWERS- optimal site for therapy
- high content of highly metabolic trabecular bone
What is important about scanning the forearm - ANSWERS- site to choice for diagnosis
for hyperparathyroidism
- use non-dominant arm
Trabecular/Cancellous Bone - ANSWERS- 20%
- spongy inner portion
- ex: spine, greater trochanter, radius, calcaneous
Osteoclast responsible for - ANSWERSresoprtion
Osteoblast responsible for - ANSWERSformation
What happens if there is an imbalance between the osteoclast and osteoblast? -
ANSWERS- removal of bone (resoprtion) occurs too quickly or formation of new bone
occurs too slowly
- osteoporosis
- increased fracture risk
What is the radiation dose during DXA scans - ANSWERS0.1 mrem/hour for pencil
0.3 mrem/hour for fan
Bone Densitometry - ANSWERS- noninvasive procedure for the measurement of bone
mineral density (BMD)
- plays an important role in the early diagnosis of osteoporosis, monitoring therapy and
predicting fracture risk
At least _______________ bone loss must occur before it can be visualized on a plain
radiograph - ANSWERS40%
Bone Densitometry began in.... - ANSWERSdentistry with plain radiographs of mandible
DXA - ANSWERS- dual energy x-ray absorptiometry
ANSWERS.
What is the current standard of care for osteoporosis detection - ANSWERSDXA
What does DXA stand for - ANSWERSdual x-ray absorptometry
80% of human skeletal mass is made up of what kind of bone - ANSWERScompact
bone (cortical)
What do osteoclast do - ANSWERS- large cells that dissolve bone
- responsible for reabsorption
What do osteoblast do - ANSWERS- cells that form new bone
- responsible for formation
What is osteoporosis - ANSWERS- porous bone
- is a disease in which the density and quality of bone are reduce
- low bone mass and deterioration of bone tissue
- increase bone fragility
Name some risk factors for osteoporosis - ANSWERS- female gender
- Caucasian or Asian race
- thin and small bony frames
- family history
- smoking
- lack of exercise
- diet low in calcium
- poor nutrition and poor general health
Which fractures have the highest degree of morbidity and mortality - ANSWERShip
fractures
What does DXA scanning measure - ANSWERSbone mass in the hip, forearm or spine
What does DXA scanning compare an individuals BMD to - ANSWERScompare to
individual with peak bone mass in your 20's (Tscore) and an overage person of the
same age (Zscore)
What is a persons T score - ANSWERS- a comparison of persons bone density
- widely used parameter to interpret BMD
- marks how far BMD deviates from a sex matched young adult peak bone mass
(amount of bony tissue at end of skeletal maturation in your 20's)
, What is a person's Z score - ANSWERS- comparison of a person's bone density with
that of an average person of the same age and sex
- reference population matched by patients age (age less than 50)
What are some common anatomical structures measured in DXA scanning -
ANSWERShip, spine, forearm (bone compartments
What is the proper patient positioning for DXA of the hip - ANSWERSpatient is supine
with the leg in a 15-25 degree internal rotation
Why do we scan the spine - ANSWERS- optimal site for therapy
- high content of highly metabolic trabecular bone
What is important about scanning the forearm - ANSWERS- site to choice for diagnosis
for hyperparathyroidism
- use non-dominant arm
Trabecular/Cancellous Bone - ANSWERS- 20%
- spongy inner portion
- ex: spine, greater trochanter, radius, calcaneous
Osteoclast responsible for - ANSWERSresoprtion
Osteoblast responsible for - ANSWERSformation
What happens if there is an imbalance between the osteoclast and osteoblast? -
ANSWERS- removal of bone (resoprtion) occurs too quickly or formation of new bone
occurs too slowly
- osteoporosis
- increased fracture risk
What is the radiation dose during DXA scans - ANSWERS0.1 mrem/hour for pencil
0.3 mrem/hour for fan
Bone Densitometry - ANSWERS- noninvasive procedure for the measurement of bone
mineral density (BMD)
- plays an important role in the early diagnosis of osteoporosis, monitoring therapy and
predicting fracture risk
At least _______________ bone loss must occur before it can be visualized on a plain
radiograph - ANSWERS40%
Bone Densitometry began in.... - ANSWERSdentistry with plain radiographs of mandible
DXA - ANSWERS- dual energy x-ray absorptiometry
