Question 1

Accuracy in bone densitometry relates to the ability of the system to:

Accepted Answer

A)  measure the true value of an object. 
B)  reproduce the same results in repeat measurements of the same object. 
C)  reflect the bone measurement by the scanner software. 
D)  measure the variability of the spread of data values around the mean. 
A)  measure the true value of an object. 
B)  reproduce the same results in repeat measurements of the same object. 
C)  reflect the bone measurement by the scanner software. 
D)  measure the variability of the spread of data values around the mean. A

Question 2

The most common osteoporotic fracture is found in the:

Accepted Answer

A)  hips. 
B)  femurs. 
C)  vertebrae. 
D)  ankles. 
A)  hips. 
B)  femurs. 
C)  vertebrae. 
D)  ankles. C

Question 3

The measurement of bone density uses two different beam energies, allowing the separation of soft tissue and bone due to:

Accepted Answer

A)  filtration differences in the beam. 
B)  mass attenuation coefficient differences. 
C)  BMD population calculations. 
D)  the two-dimensional area. 
A)  filtration differences in the beam. 
B)  mass attenuation coefficient differences. 
C)  BMD population calculations. 
D)  the two-dimensional area. B

Question 4

The purpose of bone densitometry is to:

Accepted Answer

A)  establish the diagnosis of osteoporosis. 
B)  assess the response to osteoporosis therapy. 
C)  measure bone mineral density. 
D)  do all of the above. 
A)  establish the diagnosis of osteoporosis. 
B)  assess the response to osteoporosis therapy. 
C)  measure bone mineral density. 
D)  do all of the above.

Question 5

Radiation dose for DXA scans is:

Accepted Answer

A)  twice as much as for a diagnostic lumbar x-ray. 
B)  half as much as for a lumbar CT examination. 
C)  similar to natural background radiation. 
D)  similar to a diagnostic hand x-ray. 
A)  twice as much as for a diagnostic lumbar x-ray. 
B)  half as much as for a lumbar CT examination. 
C)  similar to natural background radiation. 
D)  similar to a diagnostic hand x-ray.

Question 6

When obtaining patient history for a bone density exam the technologist should obtain the patient's:
1)history of fractures.
2)standing height and weight.
3)insurance information.

Accepted Answer

A)  1 and 2 
B)  1 and 3 
C)  2 and 3 
D)  1, 2, and 3 
A)  1 and 2 
B)  1 and 3 
C)  2 and 3 
D)  1, 2, and 3

Question 7

The T-score is used to assess:

Accepted Answer

A)  the reference population. 
B)  fracture risk for the patient. 
C)  if the measured BMD is reasonable. 
D)  patient age and bone loss. 
A)  the reference population. 
B)  fracture risk for the patient. 
C)  if the measured BMD is reasonable. 
D)  patient age and bone loss.

Question 8

Patient positioning should be exactly the same for all scans because:

Accepted Answer

A)  the images need to look the same over time. 
B)  the results will be more precise, reflecting a true biologic change. 
C)  that will allow scans from different manufacturers to be comparable. 
D)  radiologists want the same positioning to read the images. 
A)  the images need to look the same over time. 
B)  the results will be more precise, reflecting a true biologic change. 
C)  that will allow scans from different manufacturers to be comparable. 
D)  radiologists want the same positioning to read the images.

Question 9

Peak bone mass is reached at about age _____ years.

Accepted Answer

A)  10 to 20 
B)  20 to 30 
C)  30 to 40 
D)  40 to 50 
A)  10 to 20 
B)  20 to 30 
C)  30 to 40 
D)  40 to 50

Question 10

A BMD measurement from a patient is most useful when it can be compared statistically to:

Accepted Answer

A)  the same patient age population. 
B)  a population living in the same area. 
C)  multiple scans on the same patient. 
D)  an appropriate sex-matched reference population. 
A)  the same patient age population. 
B)  a population living in the same area. 
C)  multiple scans on the same patient. 
D)  an appropriate sex-matched reference population.

Question 11

What is the chief benefit of using a high and low x-ray energy source with a DXA system?

Accepted Answer

A)  Reduces patient dose significantly 
B)  Reduces wear and tear on the x-ray tube to change energies 
C)  Demonstrates attenuation difference between bone and soft tissue 
D)  Reduces post-processing time of bone for the digital image 
A)  Reduces patient dose significantly 
B)  Reduces wear and tear on the x-ray tube to change energies 
C)  Demonstrates attenuation difference between bone and soft tissue 
D)  Reduces post-processing time of bone for the digital image

Question 12

Which of the following is not a risk factor for osteoporosis?

Accepted Answer

A)  Daily physical activity 
B)  Alcohol consumption 
C)  Low body weight 
D)  Low calcium intake 
A)  Daily physical activity 
B)  Alcohol consumption 
C)  Low body weight 
D)  Low calcium intake

Question 13

Bone-destroying cells are called:

Accepted Answer

A)  osteoblasts. 
B)  osteoclasts. 
C)  cancellous. 
D)  cortical. 
A)  osteoblasts. 
B)  osteoclasts. 
C)  cancellous. 
D)  cortical.

Question 14

Precision relates to the ability of the system to:

Accepted Answer

A)  measure the true value of an object. 
B)  reproduce the same results in repeat measurements of the same object. 
C)  reflect the bone measurement by the scanner software. 
D)  measure the variability of the spread of data values around the mean. 
A)  measure the true value of an object. 
B)  reproduce the same results in repeat measurements of the same object. 
C)  reflect the bone measurement by the scanner software. 
D)  measure the variability of the spread of data values around the mean.

Question 15

Risk factors for falling and causing fractures are:
1)antidepressants.
2)impaired muscle strength.
3)environmental hazards.

Accepted Answer

A)  1 and 2 
B)  1 and 3 
C)  2 and 3 
D)  1, 2, and 3 
A)  1 and 2 
B)  1 and 3 
C)  2 and 3 
D)  1, 2, and 3

Question 16

The Z-score is used to determine:

Accepted Answer

A)  the reference population. 
B)  fracture risk for the patient. 
C)  if the measured BMD is reasonable. 
D)  patient age and bone loss. 
A)  the reference population. 
B)  fracture risk for the patient. 
C)  if the measured BMD is reasonable. 
D)  patient age and bone loss.

Question 17

DXA calculations are based on:

Accepted Answer

A)  body position and bone density. 
B)  bone density only. 
C)  soft tissue only. 
D)  soft tissue and bone. 
A)  body position and bone density. 
B)  bone density only. 
C)  soft tissue only. 
D)  soft tissue and bone.

Question 18

Which vertebral region(s) is (are) analyzed during a DXA scan?

Accepted Answer

A)  T12 
B)  T7 to L1 
C)  L1 to L5 
D)  L4 to S2 
A)  T12 
B)  T7 to L1 
C)  L1 to L5 
D)  L4 to S2

Exam 33: Bone Densitometry

Accuracy in bone densitometry relates to the ability of the system to:

The most common osteoporotic fracture is found in the:

The measurement of bone density uses two different beam energies, allowing the separation of soft tissue and bone due to:

The purpose of bone densitometry is to:

Radiation dose for DXA scans is:

When obtaining patient history for a bone density exam the technologist should obtain the patient's: 1)history of fractures. 2)standing height and weight. 3)insurance information.

The T-score is used to assess:

Patient positioning should be exactly the same for all scans because:

Peak bone mass is reached at about age _____ years.

A BMD measurement from a patient is most useful when it can be compared statistically to:

What is the chief benefit of using a high and low x-ray energy source with a DXA system?

Which of the following is not a risk factor for osteoporosis?

Bone-destroying cells are called:

Precision relates to the ability of the system to:

Risk factors for falling and causing fractures are: 1)antidepressants. 2)impaired muscle strength. 3)environmental hazards.

The Z-score is used to determine:

DXA calculations are based on:

Which vertebral region(s) is (are) analyzed during a DXA scan?

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