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ARRT BONE DENSITY EXAM STUDY SET COMPLETE ANSWERS 100% CORRECT (LATEST 2024 / 2025 )
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ARRT BONE DENSITY EXAM STUDY SET COMPLETE ANSWERS 100% CORRECT (LATEST 2024 / 2025 )
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ARRT BONE DENSITY EXAM STUDY SETCOMPLETE ANSWERS 100% CORRECT (LATEST )
1. Cancellous bone is also known as ?: Trabecular bone
2. How would you start labeling the vertebral bodies on a PA lumbar scan?-
: Start at L4 and count/label up
3. With changes in rotation of the femoral neck, what happens?: Increases theBMD
4. If daily QC fails, what should be your first step of action?: -repeat the scan
-if scan fails again, then call for help
5. Although the technology is similar with all of the DXA units, the BMDresults are
different because..........:
-different calibration standards
-algorithms to calculate BMD
-differences in the ROI
-different databases
6. The primary mechanism of action of antiresorptive therapies is the directinteraction with
the : osteoclasts
7. Which site is preferred for determination of fracture prediction?: proximalfemur
8. What is one disease not associated with low BMD?: osteopetrosis
9. DXA results may be influenced by.........:
-body thickness
-degenerative changes
-fractures
-scan mode
,10. A great forearm scan should include.......: -forearm centered
-forearm straight
-free of artifacts
11. Phantoms that mimic the shape and size of a skeletal region are called
.: anthromomorphic phantoms
12. What is the formula used to calculate BMD?: BMD = BMC/Area
13. How often should you perform the QA on the DXA unit?: everyday you scan
14. Radiogammetry is the measurement of bones using skeletal x-rays/radiographs. Which
site was often used?: metacarpals
15. With voltage switching units, what type of calibration is used?: continuousinternal
calibration--wheel or drum
16. For low energies, the most common process of absorption is the
effect.: photoelectric
17. What are some comparisons to the amount of effective dose given duringa central DXA
scan?: -less than a day of background radiation
-less than a round trip from Boston to LA
-one-tenth of a chest xray
18. Why is the non-dominant arm used in bone densitometry?: reference valuesreflect non-
dominant arm measurements
19. When measuring the proximal femur, how should the neck ROI be placed?-
: the neck ROI should be perpendicular to the femoral neck
20. What is the bone edge detection methodology?: it tests the machines abilityto distinguish
bone from soft tissue
21. What are the two most common methods for shifting the energies in DXAunits?: -energy
shifting
-k-edge filters
,22. Why do you use the hip positioner during scanning of the proximal femur?-
: to place the femoral neck parallel to the tabletop
23. Bisphosphonates prevent bone loss by....: reducing the activity of the osteo-clasts
24. If a patient has a history of hyperparathyroidism, what would the preferredsite be for
evaluation?: 33% or 1/3 of the forearm
25. What is important for serial monitoring?: precision
26. What pharmaceutical may be suggested for a woman with a high risk ofbreast cancer and
elevated lipids?: Evista (Raloxifene)
27. What year was the Bone Mass Measurement Act proposed?: 1997
28. What type of osteoporosis is a result of menopause?: Primary OsteoporosisType 1
29. What classes of cells are involved in bone remodeling?: -osteoclasts
-osteoblasts
-osteocytes
30. What therapy mimics the effects of estrogen on bone and has antiestro-genic effects in
other tissue?: Raloxifene
31. According to the WHO criteria, what is the diagnosis of osteoporosis basedon the
measurement of bone density?: 2.5 SD or more below the young adult peak bone density
32. What is the gold standard technique for measuring bone density?: DXA
33. Cancellous bone is also know as?: Trabecular Bone
34. What is the anatomical landmark on the proximal femur that gives the
best visual indication of the degree of rotation of the proximal femur?: LesserTrochanter
35. Which lumbar vertebra is described as having a characteristic shape of anX or and H on
a DXA PA spine scan?: L4
36. Is Forteo a bisphosphonate?: NO
37. 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
38. What is the most important clinical consequence of osteoporosis?: Fracture
39. What is the name of the tool that integrates clinical information in a quantitative manner
to predict a 10-year probability of major osteoporoticfracture for both men and women?:
FRAX
40. What is the major source of precision error in clinical practice?: Technologist
41. What is the percentage of trabecular bone in the skeleton?: 20 %
42. The forearm is not used to monitor the effects of therapy for osteoporosisbecause.......: rate
of change in BMD is too slow
43. What site is mostly composed of cortical bone?: Proximal forearm
44. What are the advantages of QUS over x-ray methodologies for BMD mea-surement?: -
ultrasound is comparatively inexpensive
-patients are not subjected to ionizing radiation
-ultrasound exams are quick to perform
45. What is the name of the isotope that was used in SPA?: Iodine-125
46. What is the texture index that evaluates the pixel gray-level variations inlumber spine
DXA images?: TBS (Trabecular Bone Score)
47. When does type 2 primary osteoporosis generally occur?: after age 70
48. What technique used images of the hand and an aluminum wedge?: RA(Radiograhic
Absorptiometry)
49. New bone is formed by the ?: osteoblasts
50. In both men and women, bone mass increases until approximately whatage?: 30 years
51. What must be performed in order to compare studies when a new machineis bought?:
cross-calibration
52. Which acronym best describes the least amount of BMD change that canbe statistically
significant?: LSC
53. What are the 2 types of bone?: -cortical
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