Question 1

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 2

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. D

Question 3

All are risk factors for osteoporosis,except:

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. A

Question 4

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.

Question 5

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

Question 6

Bone-destroying cells are called:

Accepted Answer

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

Question 7

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 8

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 9

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.

Question 10

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 11

The bone densitometry parameters reported on the DXA printouts include which two of the following? (Select all that apply.)

Accepted Answer

A)  Area in centimeters squared (cm2) 
B)  Mass attenuation coefficient 
C)  BMD in g/cm2 
D)  Volumetric density 
A)  Area in centimeters squared (cm2) 
B)  Mass attenuation coefficient 
C)  BMD in g/cm2 
D)  Volumetric density

Question 12

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 13

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 postprocessing 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 postprocessing time of bone for the digital image.

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

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 16

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

Exam 19: Bone Densitometry

The most common osteoporotic fracture is found in the:

The purpose of bone densitometry is to:

All are risk factors for osteoporosis,except:

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

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

Bone-destroying cells are called:

Radiation dose for DXA scans is:

The T-score is used to assess:

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

The Z-score is used to determine:

The bone densitometry parameters reported on the DXA printouts include which two of the following? (Select all that apply.)

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?

Precision relates to the ability of the system to:

DXA calculations are based on:

Peak bone mass is reached at about age _____ years.

Preliminary Steps in Radiography

General Anatomy and Radiographic Positioning Terminology

Thoracic Viscera: Chest and Upper Airway

Abdomen

Upper Extremity

Shoulder Girdle

Lower Extremity

Pelvis and Hip

Vertebral Column

Bony Thorax

Cranium

Trauma Radiography

Contrast Arthrography

Myelography and Other Central Nervous System Imaging

Digestive System: Salivary Glands, alimentary Canal, and Biliary System

Urinary System and Venipuncture

Reproductive System

Mammography

Mobile Radiography

Surgical Radiography

Pediatric Imaging

Geriatric Radiography

Sectional Anatomy for Radiographers

Computed Tomography

Magnetic Resonance Imaging

Vascular,cardiac,and Interventional Radiography

Diagnostic Medical Sonography

Nuclear Medicine and Molecular Imaging

Radiation Oncology

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