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.
pg. 1
,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.
pg. 2
,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.
pg. 3
, 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
pg. 4
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.
pg. 1
,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.
pg. 2
,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.
pg. 3
, 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
pg. 4
