Bone Density Registry Exam Prep Newest 2026-2027

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Bone Density Registry Exam Prep Newest 2026-2027 Actual Exam With Complete Questions And Correct Detailed Answers (Verified Answers) |Already Graded A+

Should a vertebra with a previous fracture (new or old) be included in a PA L-spine DXA? - ANSWER-no. because it can inaccurately increase the BMD for that vertebra

Why do you count the lumbar spine from L5-L1 instead of L1-L5 for a DXA scan? - ANSWER-so that you don't accidentally factor in a T-spine vertebra as it will lower total BMC and possibly create a false positive result

Why is L5 not to be included in a PA DXA scan? - ANSWER-it has too much interference with the pelvis

what shape is L5's vertebra? - ANSWER-dog bone/ bow tie

What shape is L4 vertebra in? - ANSWER-H or X

what is unique about L3's shape? - ANSWER-it has the largest transverse processes.

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what shape is L1-L3 vertebra in? - ANSWER-. U or Y

what are the 6 parts of an individual vertebra? - ANSWER-Body pedicles lamina spinus process transvers process articulating surface

What part of the body does a pereferal QCT look at? - ANSWER-the forearm.which is best for patients who's bones are still growing

what is Dual Energy QCT used for? - ANSWER-to eliminate error from marrow fat

marrow fat decreases with age true/false - ANSWER-false

How does QCT work? - ANSWER-patient is scanned in the CT scanner with a phantom.8-10mm slices through 2 or more vertebral body (T12-L3).only looks at trabecular portion of the vertebral body. 2 / 4

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What is Quantiative CT (QCT)? - ANSWER-BMC given via CT scan of the L-spine

What is the difference between SXA and DXA? - ANSWER-SXA is the counter part to single photon absorptiometry, but is now obsolete since DXA is more available

what does a Morphometric x-ray absorptiometry look for? - ANSWER- looks for spinal fx in the lateral spine

What are the 2 different KVp used in DEXA? - ANSWER-low energy is around 60KVp high energy is around 120KVp

How is DXA different from DPA? - ANSWER-DXA uses x-ray generators rather than a radioactive isotope.faster scan times

what is Dual Photon Absorptiometry (DPA)? - ANSWER-works the same as SPA, but uses a radioactive material that produces 2 different KV intensity's.doesn't need a water bath, so it could scan central sites.

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why were SPA and DPA considered un precise? - ANSWER-because of the radioactive decay over time followed by sudden increase in radioactivity when old source was replaced

what is Single Photon Absorptiometry (SPA)? - ANSWER-uses a single radioactive material that produces 1 level of radiation as a radiation source scanned forearms and heels because it needs a water bath to insure uniformity.

describe Radiographic Absorptiometry (RA). - ANSWER-2 x-rays of the left hand are taken on non screen film at 2 different KVp techniques it is then sent to a lab and digitized for computer analysis of the ring and middle finger is good for long term reproducible results

what is Radiographic Photodensitometry? - ANSWER-was the starter technology for SPA, DPA, and current DXA is a radiograph of the bone alongside a step wedge which is then measured with a photodensity scanner and compared to known BMD correlations with the step wedge densitys

what is the Radiologic Osteoporosis Score? - ANSWER-uses radiogrammetry of the femur and the bio-concavity of the L-spine to determine BMD

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