CT Registry Review Test questions with 100% Correct Solutions
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Course
CT Registry
Institution
CT Registry
What control does the operator have over the x-ray in the CT exam?
a. the temperature and color of the x-ray can be tuned
b. the energy level and the quantity of x-rays can be selected
c. the volume and tone of the x-ray can be adjusted
d. the phase and frequency of the x-ray can be adjusted - ...
CT Registry Review Test questions with 100%
Correct Solutions
What control does the operator have over the x-ray in the CT exam?
a. the temperature and color of the x-ray can be tuned
b. the energy level and the quantity of x-rays can be selected
c. the volume and tone of the x-ray can be adjusted
d. the phase and frequency of the x-ray can be adjusted - Answer b
Which of the following statements if TRUE?
1. kV is the voltage potential between the tube cathode and anode while mA ultimately
controls the filament current and, thus, the temperature of the cathode filament.
2. kV controls the energy level of the x-ray photons and mA controls the number of x-ray
photons emitted from the tube.
3. although the kV and the mA affect the operation of the CT x-ray tube, the two
parameters have no bearing on the image quality
a. 1 only
b. 2 only
c. 1 & 2
d. 2 & 3 - Answer c
Which of the following does NOT affect the quantity of
x-rays that completely penetrates the patient?
1. the distance that the x-ray photons must travel on their course through the patient's
body
2. the molecular composition of the tissues through which the x-ray photons pass
,3. the type of detector material used
a. 1 only
b. 2 only
c. 3 only
d. 1, 2 & 3 - Answer c
___made helical imaging possible.
a. Multi-row detector scanners
b. The introduction of second generation scanners
c. The introduction of fourth generation scanners
d. Continuous rotation scanners - Answer d
Which of the following statements is FALSE regarding the collection of CT data?
a. long scan times are more desirable b/c they average out motion artifacts
b. the reconstruction process used to create the image occurs in the array processor
c. to collect the complete set of CT data, x-ray must passed through the body at many
different angles
d. the detectors measure x-rays which completely penetrate the patient. - Answer a
Which of the following is a component NOT normally located in the gantry of modern CT
system?
a. pre patient collimators
b. solid state detectors
c. array processor
d. x-ray tube - Answer c
,X-rays are used in CT b/c:
a. they are easily produced by the high frequency generator
b. they are less harmful than the heating effects of microwave radiation
c. they penetrate the body according to specific attenuation characteristics of each
tissue
d. the FDA imposes no limit on the dose to the patient - Answer c
X-rays are produced whenever fast moving electrons collide with any form of matter b/c
:
1. the electron splits into two x-ray photons of equal energy upon impact with the
matter
2. the electron loses kinetic energy which is converted into the emission of an x-ray
photon
3. the electron converts the electron it collides with into an x-ray photon
a. 1 only
b. 2 only
c. 3 only
d. 1, 2 & 3 - Answer b
Bremsstrahlung radiation does NOT include which type of electron activity?
1. collision between an incoming electron and the nucleus of the target atom
2. collision between an incoming electron and an electron in an inner shell of the target
atom
3. slowing down of an incoming electron due to the effect of passing close to the
positive charge of the nucleus of the target atom
a. 1 only
b. 2 only
c. 3 only
, d. 1, 2 & 3 - Answer b
The mA determines the :
a. quantity of x-ray photons
b. coefficient of attenuation
c. slice thickness
d. energy level of the x-ray photons - Answer a
Increased ___ will increase the likelihood that a given x-ray will penetrate a material.
1. kV
2. mA
3. exposure time
a. 1 only
b. 2 only
c. 3 only
d. 1, 2 & 3 - Answer a
Collimation:
a. is accomplished by electrically blocking x-ray
b. affects the scan time
c. limits the low energy x-ray photons and passes the high energy photons
d. is accomplished by physically blocking x-rays - Answer d
Scatter radiation is caused by:
a. miscalibrated detector
b. x-rays generated spontaneously in the ambient atmosphere
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