Ct Tutor Exam 2 Wrong Answers

Question 1

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

Answer 1

Posterior to the bladder and anterior to the rectum.

Question 2

Which generation of scanners employs multi-row detector technology?

Answer 2

Third-generation

Question 3

Answer 3

Right external iliac artery

Question 4

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

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

Answer 4

1 only

Question 5

Normal GFR range

Answer 5

90 to 120 mL/min/1.73 m2

Question 6

Answer 6

Right pulmonary artery

Question 7

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

Answer 7

Retrospective

Question 8

Which of the following are part of the CT tube?

Filament

Array processor

Collimator

Detectors

Answer 8

Filament

Question 9

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

Answer 9

3 only

Question 10

What is indicated by the arrow in the image?

Answer 10

Ascites

Question 11

Answer 11

Internal carotid artery

Question 12

Answer 12

Superior vena cava

Question 13

A child’s pulse is

Answer 13

70-120

Question 14

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

0. 1 mm
1. 3 mm
2. 6 mm
3. 0 mm

Answer 14

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.

Question 15

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

Answer 15

False

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

Question 16

The average values for PT are between

Answer 16

10 to 14 seconds

Question 17

Answer 17

Left internal iliac artery

Question 18

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

Bronchodilator

Anticholinergic

Antihistamine

Corticosteroid

Answer 18

Corticosteroid

Question 19

Gas accumulating within a degenerating intervertebral disk is termed…

Answer 19

Vacuum phenomenon

Question 20

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

Answer 20

True

Question 21

Answer 21

Dirty fat inflammation

Question 22

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

True

False

Answer 22

False

Question 23

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

Answer 23

2 only

Question 24

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

Answer 24

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.

Question 25

Answer 25

Brachiocephalic artery

Question 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

Answer 26

False

Question 27

controls the voltage potential between the tube cathode and the anode.

Answer 27

kV

Question 28

controls the filament current which controls the temperature of the cathode filament from which the electron beam is emitted.

Answer 28

mA or tube current

Question 29

Characteristic radiation results from the collision between an incoming electron and an electron in an inner shell of the target atom.

True

False

Answer 29

True

Question 30

Two conditions produce Bremsstrahlung radiation

Answer 30

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.

Question 31

The pulse rate range for an infant is

Answer 31

100 – 180 BPM

Question 32

Fibrous plaque

Arterial plaque

Calcific plaque

Non-calcific plaque

Answer 32

Calcific plaque

Question 33

Left common carotid artery

Left internal carotid artery

Left subclavian artery

Left external carotid artery

Answer 33

Left common carotid artery

Question 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

Answer 34

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

Question 35

Collimation blocks x-ray electronically to control the thickness of the x-ray beam.

True

False

Answer 35

False