Ct Tutor Exam 2 Wrong Answers Flashcards
The position of the seminal vesicles in the male pelvis should be located…
Posterior to the bladder and anterior to the rectum.
Which generation of scanners employs multi-row detector technology?
Third-generation
Right external iliac artery
Which factor(s) has no measurable effect on the spatial resolution?
- kVp
- Focal spot size
- Detector sampling frequency
- Matrix size
1 only
Normal GFR range
90 to 120 mL/min/1.73 m2
Right pulmonary artery
o reconstruct an image a second time with some change in technical factor is called ________________.
Retrospective
Which of the following are part of the CT tube?
Filament
Array processor
Collimator
Detectors
Filament
Which of the following is/are considered examples of a mild reaction to iodinated intravenous contrast media?
- Shock
- Pulmonary edema
- Vomiting
- Dyspnea
1 only
1 and 2 only
3 only
3 and 4 only
3 only
What is indicated by the arrow in the image?
Ascites
Internal carotid artery
Superior vena cava
A child’s pulse is
70-120
The limiting resolution of a CT scanner is 15 lp/cm, what is the smallest object size that can be resolved?
- 1 mm
- 3 mm
- 6 mm
- 0 mm
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.
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
False
the high voltage (not “frequency”) generator produces the tube voltage across the tube cathode and anode.
The average values for PT are between
10 to 14 seconds
Left internal iliac artery
The drug known as Solu-Cortef may be classified as a…
Bronchodilator
Anticholinergic
Antihistamine
Corticosteroid
Corticosteroid
Gas accumulating within a degenerating intervertebral disk is termed…
Vacuum phenomenon
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
True
Dirty fat inflammation
Corticosteroids are a type of hydrocortisone used during the treatment of anaphylactoid reactions to iodinated contrast materials.
True
False
False
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?
- A collision between the incoming electron and the nucleus of the target atom.
- A collision between the incoming electron and an electron in an inner shell of the target atom.
- 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
2 only
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
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.
Brachiocephalic artery
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
controls the voltage potential between the tube cathode and the anode.
kV
controls the filament current which controls the temperature of the cathode filament from which the electron beam is emitted.
mA or tube current
Characteristic radiation results from the collision between an incoming electron and an electron in an inner shell of the target atom.
True
False
True
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.
The pulse rate range for an infant is
100 – 180 BPM
Fibrous plaque
Arterial plaque
Calcific plaque
Non-calcific plaque
Calcific plaque
Left common carotid artery
Left internal carotid artery
Left subclavian artery
Left external carotid artery
Left common carotid artery
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
Collimation blocks x-ray electronically to control the thickness of the x-ray beam.
True
False
False
