CT Exam Review_Image Production
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Science
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University
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Practice Problem
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Easy
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Ashley Brock
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35 questions
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1.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
Which of the following reduces the scatter radiation reaching the detectors?
Post-patient collimation
Pre-patient collimation
Pre-detector collimation
Answer explanation
Pre-detector collimation and post-patient collimation are synonymous. Both terms describe a device designed to remove scatter radiation before it reaches the detector.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is the primary interaction between x-ray photons and tissue during computed tomography?
Compton effect
Bremsstrahlung
Coherent scatter
Characteristic
Answer explanation
Owing to the high-energy beam used in CT, the Compton effect is the predominant interaction between x-ray and matter. CT scanners use between 120 and 140 kVp, yielding x-ray energies with averages between 70 and 80 keV.
Tags
NGSS.HS-PS4-4
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The process by which electrons are produced at the cathode of a CT x-ray tube is known as:
rectification.
thermionic emission.
isotropic emission.
anode heel effect.
Answer explanation
When the cathode of an x-ray tube is heated, electrons are released through the process of thermionic emission. It is these electrons that are then accelerated toward the anode for x-ray production.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The assignment of different generations to CT scanners is based on the configuration of the:
patient and gantry.
tube and collimators.
anode and cathode.
tube and detectors.
Answer explanation
CT scanners are often placed into one of several different "generations." The differences in generations are based on the relationship of the tube and detectors and the position of each during data acquisition.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
When one is using a third-generation CT scanner, it is important that reference detectors positioned at the peripheral portions of the detector array be exposed to:
homogeneous radiation.
unattenuated radiation.
monochromatic radiation.
remnant radiation.
Answer explanation
Reference detectors are used to measure incident radiation intensity. This information is used by the computer during the calculation of the linear attenuation coefficient. If the patient is placed incorrectly within the gantry, the reference detectors may be partially blocked, causing an out-of-field artifact.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In 1979, the scientists __________ and __________ shared the Nobel Prize for their research in computed tomography.
Answer explanation
Dr. Godfrey Hounsfield and Dr. Allan Cormack shared the Nobel Prize for their work on the development of computed tomography in 1979.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The type of compensating filter used at the x-ray tube of a CT scanner is called a:
Answer explanation
The bow-tie filter used at the x-ray tube of a CT scanner absorbs a larger amount of radiation at the periphery of the patient, where the part thickness is reduced. The center of the patient is placed at the center of the filter, where the largest amount of radiation is allowed to pass through. The use of this type of filter attempts to compensate for the differences in thickness of the often oval-shaped patient.
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