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CT EXAM #1 RETAKE EXAM QUESTIONS AND ANSWERS
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CT EXAM #1 RETAKE EXAM QUESTIONS AND ANSWERS
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CT EXAM #1 RETAKE EXAMQUESTIONS AND ANSWERS
NOT considering patient motion, and with all other factors equal, which of the following
CT scanning methods generates the best image quality, free from artifacts,
demonstrating the greatest detail?
a. conventional scan
b. localizer scan
c. helical scan - Answer-a conventional scan
The stationary metal contacts through which electrical signals are transferred to and
from the rotating slip ring are knownas the:
a. detectors
b. electrical brushes
c. CT x-ray tube
d. power supply - Answer-b. electrical brushes
Which of the following might improve our ability to visualize a tiny lung nodule?
1. decrease the acquired slice thickness
2. decrease the reconstructed slice thickness
3. decrease the reconstruction interval - Answer-1 & 3
Which of the following will result in displaying a wider range of CT numbers as shades
of gray on the CT images?
a. increasing the window level
b. increasing the window width
c. decreasing the window width
d. decreasing the window level - Answer-b. increasing the window width
Which of the following will yield the lowest patient dose (assuming all other parameters
are the same)?
a. mA = 100 1 sec rotation
b. mA = 200 1 sec rotation
c. mA = 100 0.5 sec rotation
d. mA = 200 0.5 sec rotation - Answer-c. mA = 100 0.5 sec rotation
On a MDCT scanner, which of the following may be TRUE when acquiring thicker slices
compared to thinner slices?
1. attenuation information from adjacent detector arrays is added together
2. the x-ray beam is collimated to a greater thickness
3. the same anatomical regions is scanned in less time - Answer-1, 2 and 3
How many shades of gray can be found in 1 pixel of a digital image? - Answer-1
, On a conventional CT scan on an MDCT scanner that acquires the data from sixteen
contiguous 1 mm slices in one rotation in order to have the next group of slices be
contiguous at the end of the rotation the table should move ___________ mm - Answer-
16 mm
Which of the following events is responsible for changing the raw data into image data?
a. attenuation
b. reconversion
c. ionization
d. reconstruction - Answer-d. reconstruction
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. the energy level
and the quantity of x-rays can be selected
The CT x-ray tube:
a. produces the beam of x-rays
b. shields the patient from the x-rays
c. measures the x-ray information coming from the patient
d. moves the patient table during the scan - Answer-a. produces the beam of x-rays
Though which component are most of the commands from the technologist entered?
a. ADC
b. amplifier
c. array processor
d. operators console - Answer-d. operators console
The attenuation information measured by the detectors is called the:
a. CT image
b. back projection
c. filtered data
d. raw data - Answer-d. raw data
Which of the following will increase the number of x-ray photons produced by the Ct x-
ray tube?
a. decreased kV
b. increased mA
c. decreased mA
d. increased kV` - Answer-b. increased mA
A detector array:
a. is stationary in all scanner designs commercially available today
b. was first seen on first generation CT scanners
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