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ARRT Bone Density Exam Study Guide-Exam Bank| 400 + Questions with Expert Verified Answers| Success Guaranteed| Newest 2025-2026! According to the WHO criteria, what is the diagnosis of osteoporosis based on the measurement of bone density? 2.5 SD or more below the young adult peak bone density What is the gold standard technique for measuring bone density? DXA Cancellous bone is also know as? 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? Lesser Trochanter Which lumbar vertebra is described as having a characteristic shape of an X or and H on a DXA PA spine scan? L4 Is Forteo a bisphosphonate? NO Quantitative Computated Tomography (QCT) -measurements are volumetric -trabecular bone can be isolated from cortical bone -accuracy may be affected by marrow fat Peripheral BMD measurements are advocated for _____________? Screening What is the most important clinical consequence of
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According to the WHO criteria, what is the diagnosis of osteoporosis based on the measurement of bone density? 2.5 SD or more below the young adult peak bone density What is the gold standard technique for measuring bone density? DXA Cancellous bone is also know as? 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? Lesser Trochanter Which lumbar vertebra is described as having a characteristic shape of an X or and H on a DXA PA spine scan? L Is Forteo a bisphosphonate? NO Quantitative Computated Tomography (QCT)
Cancellous bone is also known as _______________? Trabecular bone How would you start labeling the vertebral bodies on a PA lumbar scan? Start at L4 and count/label up With changes in rotation of the femoral neck, what happens? Increases the BMD If daily QC fails, what should be your first step of action?
The primary mechanism of action of antiresorptive therapies is the direct interaction with the __________________ osteoclasts Which site is preferred for determination of fracture prediction? proximal femur What is one disease not associated with low BMD? osteopetrosis DXA results may be influenced by.........
If a patient has a history of hyperparathyroidism, what would the preferred site be for evaluation? 33% or 1/3 of the forearm What is important for serial monitoring? precision What pharmaceutical may be suggested for a woman with a high risk of breast cancer and elevated lipids? Evista (Raloxifene) What year was the Bone Mass Measurement Act proposed? 1997 What type of osteoporosis is a result of menopause? Primary Osteoporosis Type 1 What classes of cells are involved in bone remodeling?
Bone mineral density is expressed as......... g/cm squared How many times should you scan a patient with in-vivo precision study?
LSC (Least Significant Change) A DXA scanner that uses a single detector and a pinhole collimator is a........ pencil beam scanner Regarding Shewart Rules, the control limits are based on what percentage of the average values? 1.5% (3 SD) What is the sum of the data values divided by the number of values? mean A DXA system that employs a rare earth filtered x-ray source uses what type of detector? pulse counting The characteristic shapes of the vertebrae seen on the DXA image are primarily based on the appearance of the ____________ elements. posterior Accuracy
males or females under age 20 What is the name of the isotope used in DPA? Gadolinium- 153 What bone parameter is measured in grams? BMC The region of the proximal femur lying on the border of the femoral neck and the greater trochanter is termed the.............. Ward's Area What are the diagnosis guidelines for children?
What skeletal site may be preferred for assessing early menopause following an oophorectomy? spine An increase in the overall bone mass of a patient is closely related to an accelerated rate of bone ___________ and a reduced amount of _______________. formation; resorption What scan measures the most trabecular bone? QCT of the spine What are 2 types of exercise that are great for your bones?
54 million The _____ is the only validated skeletal site for the clinical use of QUS in osteoporosis. heel Standard Deviation (SD) measure of the variability or the spread of data around the mean As _______ increases, the risk for a hip fracture increases independent of the BMD HAL (hip axis length) What is the scanning pattern used with the pencil beam? rectilinear What does Sievert refer to? effective dose What is accuracy most important for? diagnosis *less important for serial monitoring Standard Scores (SS) indicate how many standard deviations above or below the average value in question actually lies Precision
ability to reproduce a measurement when performed under identical conditions T-score number of SD an individual's BMD is from the average BMD for sex-matched young normal peak bone mass Quantitative Ultrasound (QUS) measures the broadband attenuation properties of bone Bone loss occurs when __________ exceeds ____________ resorption; formation Osteoporosis skeletal disorder characterized by compromised bone strength WHO definition of osteoporosis T-score of - 2.5 SD or below Primary Osteoporosis
What is the major inorganic compound of bone? calcium phosphate crystals Bone consists of ______% of organic substances 25% Bone consists of ____% of inorganic substances 75% Appendicular skeleton pelvic girdle, limbs, hands and feet Weight bearing sites