Ct Tutor Exam 3 Wrong answers

Question 1

Which of the following is considered a non-ionic contrast material? 1. iodamide 2. iohexol 3. iothalamate 4. diatrizoate

Answer 1

2

Question 2

the percent of total available x-rays that actually enter the detector chamber.

Answer 2

capture efficiency

Question 3

The focal spot size is a geometric factor that influences___

Answer 3

spatial resolution

Question 4

Contrast resolution is dependent on (4)

Answer 4

section(slice)width, algorithm selection, detector sensitivity, and noise

Question 5

Which of the following will reduce the appearance of noise in the CT image? 1. Use of a wide window width 2. Increase in mAs 3. Increase in slice thickness

Answer 5

1,2, and 3 The appearance of noise in the CT image can be reduced by increasing mAs and increasing the slice thickness. Both of these cause an increase in the number of photons that penetrate the slice. The more photons the less noticeable noise will appear. The perception of noise is also decreased by using a wide window width.

Question 6

the portion of the internal carotid artery as it enters the bony skull is called the carotid__?

Answer 6

siphon

Question 7

number 5

Answer 7

ulna

Question 8

the percent of x-rays entering the chamber which collides with the detector atoms.

Answer 8

absorption efficency

Question 9

type of scan used in brain perfusion imaging:

Answer 9

dynamic

Question 10

iopamidol (Isovue), Iohexol (Omnipaque), and iopromide (Ultravist)

Answer 10

non-ionic contrast

Question 11

An acoustic neuroma (schwannoma) is formed from Schwann cells of the eighth cranial nerve (vestibulocochlear nerve). This type of cranial mass is best imaged with CT examinations of the:

Answer 11

internal auditory canals.

Question 12

Answer 12

Corpus callosum

Question 13

Answer 13

Falx cerebri

Question 14

responsible for translating the commands into machine language and then sending each code to the appropriate system component.

Answer 14

The host computer

Question 15

The commands from the technologist are most often received by the _______ of the computer.

Answer 15

System console

Question 16

reconstructs images from the detector signals after they are sampled and digitized.

Answer 16

the array processor

Question 17

The post-processing technique that would include only the bone tissue of a CT examination of the pelvis would be…

Answer 17

Thresholding

Question 18

limiting the computer to include pixels with only a certain range of CT number values a three-dimensional model of a specific tissue can be rendered. This technique is called

Answer 18

thresholding.

Question 19

Answer 19

Main pulmonary artery

Question 20

The primary point of interaction between the operator and the rest of the imaging system is the

Answer 20

system console

Question 21

reconstructs images from the detector signals after they are sampled and digitized.

Answer 21

The array processor

Question 22

The major disadvantage of the early back-projection method of image reconstruction is the appearance of the

Answer 22

Star artifact

Question 23

Answer 23

Scaphoid

Question 24

The partial volume artifact is reduced with the use of a

Answer 24

smaller slice width

Question 25

The production of the scatter radiation absorbed by the patient and detectors is caused by an interaction of the x-ray photon and matter, termed

Answer 25

Compton interaction

Question 26

The diastolic pressure range for an adult is

Answer 26

60 – 80 mm Hg

Question 27

Systolic pressure range for an adult is

Answer 27

110 – 140 mm Hg

Question 28

Answer 28

Anterior cerebral artery

Question 29

Non-ionic contrast media have an average osmolality of

Answer 29

750 mOsm/kg of water

Question 30

A patient is positioned for a CT examination of the right foot. Which of the following accurately describes the position of the patient?

Answer 30

Supine with knees flexed and plantar surface of feet resting on the table

Question 31

Answer 31

Splenic artery

Question 32

Answer 32

Glenoid cavity

Question 33

the source of the electron beam

Answer 33

The cathode filament

Question 34

Answer 34

Ascending colon

Question 35

What is the average range for activated partial thromboplastin time?

Answer 35

28 – 34 seconds

Question 36

The aperture size determines the

Answer 36

slice or section thickness

Question 37

Answer 37

Capitate

Question 38

When the CT technologist selects the thickness of the slice the ___ is determined.

Answer 38

focal spot size

Question 39

Answer 39

Internal carotid artery

Question 40

Answer 40

Middle cerebral artery

Question 41

Answer 41

Greater wing of sphenoid

Question 42

an infant’s pulse rate averages between

Answer 42

100 to 180 BPM.

Question 43

A child pulse rate is between

Answer 43

80 and 120 BPM

Question 44

An adult pulse rate averages between

Answer 44

70 to 100 BPM.

Question 45

Answer 45

Hamate

Question 46

The cause of the cupping artifact is?

Answer 46

The tissues of the body attenuate low energy photons.