Ct Tutor Exam 2 Wrong Answers Flashcards

1
Q

The position of the seminal vesicles in the male pelvis should be located…

A

Posterior to the bladder and anterior to the rectum.

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2
Q

Which generation of scanners employs multi-row detector technology?

A

Third-generation

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3
Q
A

Right external iliac artery

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4
Q

Which factor(s) has no measurable effect on the spatial resolution?

  1. kVp
  2. Focal spot size
  3. Detector sampling frequency
  4. Matrix size
A

1 only

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5
Q

Normal GFR range

A

90 to 120 mL/min/1.73 m2

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6
Q
A

Right pulmonary artery

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7
Q

o reconstruct an image a second time with some change in technical factor is called ________________.

A

Retrospective

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8
Q

Which of the following are part of the CT tube?

Filament

Array processor

Collimator

Detectors

A

Filament

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9
Q

Which of the following is/are considered examples of a mild reaction to iodinated intravenous contrast media?

  1. Shock
  2. Pulmonary edema
  3. Vomiting
  4. Dyspnea

1 only

1 and 2 only

3 only

3 and 4 only

A

3 only

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10
Q

What is indicated by the arrow in the image?

A

Ascites

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11
Q
A

Internal carotid artery

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12
Q
A

Superior vena cava

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13
Q

A child’s pulse is

A

70-120

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14
Q

The limiting resolution of a CT scanner is 15 lp/cm, what is the smallest object size that can be resolved?

  1. 1 mm
  2. 3 mm
  3. 6 mm
  4. 0 mm
A

0.3 mm

To find the minimum object size that a CT scanner can resolve, the reciprocal value of the limiting resolution of the scanner must be calculated. The reciprocal of 15 lp/cm = 1/15 lp/cm. This is equal to 10/15 lp/mm which is equal to 0.6 mm/lp. 0.6 mm/lp is divided in half to account for a line pair being a line and the space adjacent to it. This scanner can resolve an object 0.3mm in size.

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15
Q

X-ray production in CT is produced using a high-frequency generator to produce the tube voltage across the tube cathode and anode.

True

False

A

False

the high voltage (not “frequency”) generator produces the tube voltage across the tube cathode and anode.

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16
Q

The average values for PT are between

A

10 to 14 seconds

17
Q
A

Left internal iliac artery

18
Q

The drug known as Solu-Cortef may be classified as a…

Bronchodilator

Anticholinergic

Antihistamine

Corticosteroid

A

Corticosteroid

19
Q

Gas accumulating within a degenerating intervertebral disk is termed…

A

Vacuum phenomenon

20
Q

The two events that produce x-ray photons (Bremsstrahlung radiation) useful in CT imaging result from the loss of kinetic energy from the incoming electron.

True

False

21
Q
A

Dirty fat inflammation

22
Q

Corticosteroids are a type of hydrocortisone used during the treatment of anaphylactoid reactions to iodinated contrast materials.

True

False

23
Q

Bremsstrahlung radiation is the type of interaction that produces the x-ray photons used in CT imaging. Which of the following types of electron activity does NOT result in Bremsstrahlung radiation?

  1. A collision between the incoming electron and the nucleus of the target atom.
  2. A collision between the incoming electron and an electron in an inner shell of the target atom.
  3. A slowing down of an incoming electron resulting from passing close to the positive charge of the target atoms nucleus.

1 only

2 only

3 only

1, 2, and 3

24
Q

Solid-state detectors ionize in response to an x-ray conversion resulting in a flash of light which is converted to an electrical signal.

True

False

A

False

Xenon ionizes in response to an x-ray conversion, solid-state detectors generate a flash of light which is converted to an electrical signal by means of a photodiode.

25
Brachiocephalic artery
26
mA is the voltage potential between the tube cathode and the anode while kV controls the filament current and the temperature of the cathode filament. True False
False
27
controls the voltage potential between the tube cathode and the anode.
kV
28
controls the filament current which controls the temperature of the cathode filament from which the electron beam is emitted.
mA or tube current
29
Characteristic radiation results from the collision between an incoming electron and an electron in an inner shell of the target atom. True False
True
30
Two conditions produce Bremsstrahlung radiation
1) the electron collides with the target atoms nucleus and 2) the electron is slowed down as it passes the positive charge of a target atoms nucleus.
31
The pulse rate range for an infant is
100 – 180 BPM
32
Fibrous plaque Arterial plaque Calcific plaque Non-calcific plaque
Calcific plaque
33
Left common carotid artery Left internal carotid artery Left subclavian artery Left external carotid artery
Left common carotid artery
34
An abnormal density of the liver is found to be a fatty infiltrate. The CT number for this area would most likely be in the range of -100 Hounsfield units. True False
True Fatty infiltrates greatly reduce the density of the liver. The minimal attenuation of fat results in a low CT number value in the range of -100 Hounsfield units
35
Collimation blocks x-ray electronically to control the thickness of the x-ray beam. True False
False