Deck 1: Modalities of Medical Imaging

Question 1

Which of the following shows the order of radiologic densities from most dense to least dense?

A) Metal, calcium, air, fat, water
B) Calcium, metal, fat, water, air
C) Metal, calcium, water, fat, air
D) Calcium, metal, fat, air, water
E) Metal, calcium, water, air, fat

Answer 1

Metal, calcium, water, fat, air

Question 2

The finding of an air-fluid level on a radiologic image may reveal all of the following except:

A) the presence of fluid in an air cavity such as a paranasal sinus.
B) the presence of gas and purulent fluid in an abscess.
C) the orientation of the patient when the radiograph was done.
D) the normal presence of fluid and air in the stomach.
E) the radiographic density of pathologic fluid.

Answer 2

the radiographic density of pathologic fluid.

Question 3

The three types of resolution fundamental to radiologic imaging are:

A) spatial, temporal, and color.
B) spatial, sensitivity, and contrast.
C) spatial, temporal, and sensitivity.
D) spatial, contrast, and color.
E) spatial, contrast, and temporal.

Answer 3

spatial, contrast, and temporal.

Question 4

Which of the following is not true about radiographic projections?

A) The heart appears larger in an AP than in a PA projection.
B) A portable x-ray of a supine bedridden patient would be an AP projection.
C) In a lateral projection, a side marker indicates the side of the patient closest to the detector.
D) Oblique projections always have the patient's right side closer to the detector.
E) Both AP and PA projections are viewed as if the patient is looking at you.

Question 5

Which of the following is not true about partial volume averaging?

A) It is more likely to occur in thin sections than in thicker sections.
B) It is applicable to CT.
C) It is applicable to MR.
D) It may result in a missed diagnosis because of an apparent loss of contrast resolution.

Question 6

A narrow CT window refers to:

A) a narrow opening by which ionizing radiation is emitted from the CT scanner.
B) a narrow opening in the CT gantry for the patient, which enhances image quality.
C) a CT scan in which small differences in CT attenuation are clearly visible.
D) a CT scan in which small differences in CT attenuation are less evident.

Question 7

In the most common T2-weighted MRI images without fat suppression:

A) fluid has high signal (shown as bright), and fat has low signal (shown as dark).
B) fluid has low signal, and fat has low signal.
C) fluid has high signal, and fat commonly also has high signal.
D) fluid has low signal, and fat has high signal.

Question 8

Ultrasound imaging:

A) is excellent for cortical bone.
B) is excellent for lung.
C) usually shows enhancement posterior to fluid structures.
D) is always based on using strict orthogonal planes.
E) should not be used on pregnant patients.

Question 9

Nuclear medicine:

A) has better contrast resolution than MRI.
B) has better spatial resolution than radiography.
C) provides more information about physiologic activity than CT.
D) involves significantly more ionizing radiation risks than CT.

Question 10

Which of the following is not true about gadolinium-based contrast material?

A) It is used with CT.
B) It is used with MRI.
C) It is associated with nephrogenic systemic fibrosis in a very small percentage of patients with advanced renal failure.
D) It generally differentiates vascularized tissue from relatively avascular tissue such as an area of fibrosis, and in the brain differentiates areas of intact blood-brain barrier from damaged or absent blood-brain barrier.

Question 11

Which of the following type of information is not part of a radiology report?

A) Patient demographic data
B) Clinical history
C) Differential diagnosis
D) Cost data
E) Modalities done

Question 12

Clinically relevant information should be included on a radiology order for all of the following reasons except:

A) to help focus the radiologist's attention on the acute clinical concern.
B) to improve the sensitivity and specificity of the radiologic interpretation.
C) for the benefit of the patient.
D) to increase the likelihood of the radiology report having clinical relevance.
E) to reduce expenses.