ARRT Bone Density Exam Study Set Questions And Answers Rated A+ 2024/25.
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ARRT Bone Density
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ARRT Bone Density
ARRT Bone Density Exam Study Set Questions And Answers Rated A+ 2024/25.
According to the WHO criteria, what is the diagnosis of osteoporosis based on the measurement of bone density? - correct answer. 2.5 SD or more below the young adult peak bone density
What is the gold s...
ARRT Bone Density Exam Study Set
Questions And Answers Rated A+ 2024/25.
According to the WHO criteria, what is the diagnosis of osteoporosis based on the
measurement of bone density? - correct answer. 2.5 SD or more below the young
adult peak bone density
What is the gold standard technique for measuring bone density? - correct answer.
DXA
Cancellous bone is also know as? - correct answer. Trabecular Bone
What is the anatomical landmark on the proximal femur that gives the best visual
indication of the degree of rotation of the proximal femur? - correct answer. Lesser
Trochanter
Which lumbar vertebra is described as having a characteristic shape of an X or and H
on a DXA PA spine scan? - correct answer. L4
Is Forteo a bisphosphonate? - correct answer. NO
Quantitative Computated Tomography (QCT) - correct answer. -measurements are
volumetric
-trabecular bone can be isolated from cortical bone
-accuracy may be affected by marrow fat
Peripheral BMD measurements are advocated for _____________? - correct answer.
Screening
,What is the most important clinical consequence of osteoporosis? - correct answer.
Fracture
What is the name of the tool that integrates clinical information in a quantitative manner
to predict a 10-year probability of major osteoporotic fracture for both men and women?
- correct answer. FRAX
What is the major source of precision error in clinical practice? - correct answer.
Technologist
What is the percentage of trabecular bone in the skeleton? - correct answer. 20 %
The forearm is not used to monitor the effects of therapy for osteoporosis because....... -
correct answer. rate of change in BMD is too slow
What site is mostly composed of cortical bone? - correct answer. Proximal forearm
What are the advantages of QUS over x-ray methodologies for BMD measurement? -
correct answer. -ultrasound is comparatively inexpensive
-patients are not subjected to ionizing radiation
-ultrasound exams are quick to perform
What is the name of the isotope that was used in SPA? - correct answer. Iodine-125
What is the texture index that evaluates the pixel gray-level variations in lumber spine
DXA images? - correct answer. TBS (Trabecular Bone Score)
When does type 2 primary osteoporosis generally occur? - correct answer. after age
70
What technique used images of the hand and an aluminum wedge? - correct answer.
RA (Radiograhic Absorptiometry)
New bone is formed by the ___________? - correct answer. osteoblasts
Cancellous bone is also known as _______________? - correct answer. Trabecular
bone
How would you start labeling the vertebral bodies on a PA lumbar scan? - correct
answer. Start at L4 and count/label up
With changes in rotation of the femoral neck, what happens? - correct answer.
Increases the BMD
,If daily QC fails, what should be your first step of action? - correct answer. -repeat
the scan
-if scan fails again, then call for help
Although the technology is similar with all of the DXA units, the BMD results are
different because.......... - correct answer. -different calibration standards
-algorithms to calculate BMD
-differences in the ROI
-different databases
The primary mechanism of action of antiresorptive therapies is the direct interaction with
the __________________ - correct answer. osteoclasts
Which site is preferred for determination of fracture prediction? - correct answer.
proximal femur
What is one disease not associated with low BMD? - correct answer. osteopetrosis
DXA results may be influenced by......... - correct answer. -body thickness
-degenerative changes
-fractures
-scan mode
A great forearm scan should include....... - correct answer. -forearm centered
-forearm straight
-free of artifacts
Phantoms that mimic the shape and size of a skeletal region are called
______________________________. - correct answer. anthromomorphic
phantoms
What is the formula used to calculate BMD? - correct answer. BMD = BMC/Area
How often should you perform the QA on the DXA unit? - correct answer. everyday
you scan
, Radiogammetry is the measurement of bones using skeletal x-rays/radiographs. Which
site was often used? - correct answer. metacarpals
With voltage switching units, what type of calibration is used? - correct answer.
continuous internal calibration--wheel or drum
For low energies, the most common process of absorption is the
________________________ effect. - correct answer. photoelectric
What are some comparisons to the amount of effective dose given during a central DXA
scan? - correct answer. -less than a day of background radiation
-less than a round trip from Boston to LA
-one-tenth of a chest xray
Why is the non-dominant arm used in bone densitometry? - correct answer.
reference values reflect non-dominant arm measurements
When measuring the proximal femur, how should the neck ROI be placed? - correct
answer. the neck ROI should be perpendicular to the femoral neck
What is the bone edge detection methodology? - correct answer. it tests the
machines ability to distinguish bone from soft tissue
What are the two most common methods for shifting the energies in DXA units? -
correct answer. -energy shifting
-k-edge filters
Why do you use the hip positioner during scanning of the proximal femur? - correct
answer. to place the femoral neck parallel to the tabletop
Bisphosphonates prevent bone loss by.... - correct answer. reducing the activity of
the osteoclasts
If a patient has a history of hyperparathyroidism, what would the preferred site be for
evaluation? - correct answer. 33% or 1/3 of the forearm
What is important for serial monitoring? - correct answer. precision
What pharmaceutical may be suggested for a woman with a high risk of breast cancer
and elevated lipids? - correct answer. Evista (Raloxifene)
What year was the Bone Mass Measurement Act proposed? - correct answer. 1997
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