Exam (elaborations)
ARRT Bone Density Exam Study Set Exam 2024
- Course
- Institution
ARRT Bone Density Exam Study Set Exam 2024
[Show more]
Seller
Follow
Victorious23
Reviews received
Content preview
ARRT Bone Density Exam Study Set Exam2024
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 osteoporosis? - -
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? - -FRAX
-What is the major source of precision error in clinical practice? - -
Technologist
-What is the percentage of trabecular bone in the skeleton? - -20 %
-The forearm is not used to monitor the effects of therapy for osteoporosis
because....... - -rate of change in BMD is too slow
,-What site is mostly composed of cortical bone? - -Proximal forearm
-What are the advantages of QUS over x-ray methodologies for BMD
measurement? - --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? - -Iodine-125
-What is the texture index that evaluates the pixel gray-level variations in
lumber spine DXA images? - -TBS (Trabecular Bone Score)
-When does type 2 primary osteoporosis generally occur? - -after age 70
-What technique used images of the hand and an aluminum wedge? - -RA
(Radiograhic Absorptiometry)
-New bone is formed by the ___________? - -osteoblasts
-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? - --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.......... - --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 __________________ - -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......... - --body thickness
-degenerative changes
-fractures
-scan mode
-A great forearm scan should include....... - --forearm centered
-forearm straight
-free of artifacts
-Phantoms that mimic the shape and size of a skeletal region are called
______________________________. - -anthromomorphic phantoms
-What is the formula used to calculate BMD? - -BMD = BMC/Area
-How often should you perform the QA on the DXA unit? - -everyday you
scan
-Radiogammetry is the measurement of bones using skeletal
x-rays/radiographs. Which site was often used? - -metacarpals
-With voltage switching units, what type of calibration is used? - -continuous
internal calibration--wheel or drum
-For low energies, the most common process of absorption is the
________________________ effect. - -photoelectric
-What are some comparisons to the amount of effective dose given during a
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
-Why is the non-dominant arm used in bone densitometry? - -reference
values reflect non-dominant arm measurements
, -When measuring the proximal femur, how should the neck ROI be placed? -
-the neck ROI should be perpendicular to the femoral neck
-What is the bone edge detection methodology? - -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? - --energy shifting
-k-edge filters
-Why do you use the hip positioner during scanning of the proximal femur? -
-to place the femoral neck parallel to the tabletop
-Bisphosphonates prevent bone loss by.... - -reducing the activity of the
osteoclasts
-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? - --osteoclasts
-osteoblasts
-osteocytes
-What therapy mimics the effects of estrogen on bone and has
antiestrogenic effects in other tissue? - -Raloxifene
-In both men and women, bone mass increases until approximately what
age? - -30 years
-What must be performed in order to compare studies when a new machine
is bought? - -cross-calibration
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Victorious23. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $20.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
77988 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now