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Exam (elaborations)

CT Review(questions well answered with latest update)

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  • Course
  • Computered Tomography
  • Institution
  • Computered Tomography

CT Review(questions well answered with latest update)

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  • August 9, 2024
  • 17
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • Computered Tomography
  • Computered Tomography
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BravelRadon
CT Review

The ability to display small objects, or define small objects distinctly describes? - correct answer
✔✔Spatial resolution



Tomography's root word "tomo" means? - correct answer ✔✔Cut, section, or layer



CT numbers are usually provided in the form of? - correct answer ✔✔Houndsfield units



The reduction in intensity of an x-ray beam as it interacts with matter is termed? - correct answer
✔✔attenuation



The most current and proper name for CT is? - correct answer ✔✔Computed Tomography



What is a major limitation of conventional radiography when compared to computed tomography?

-superimposition of tissues

-homogenous x-ray photon production

-increased radiation dose to the patient

-lack of digital imaging capabilities - correct answer ✔✔Superimposition of tissues



A CT scanner creates what type of images? - correct answer ✔✔cross-sectional



The thickness of a slice would be determined by what axis of the body? - correct answer ✔✔z-axis



Given the window setting of window width = 1200, and window level = -300, what would be the lowest
value in the range? - correct answer ✔✔-900



A ct image is displayed in a window with a level of 0 and a width of 500. What would the pixel values be?
- correct answer ✔✔pixels with values between -250 and +250 HU are assigned shades of grey

,RIO measurements include what?

-the area selected

-the average HU

-the standard deviation - correct answer ✔✔all of the above



As the displayed field of view decreases

1. less anatomy is selected

2. spatial resolution increases

3. spatial resolution decreases - correct answer ✔✔1 and 2



what CT number represents water? - correct answer ✔✔0



Window width represents what? - correct answer ✔✔image contrast



to view a CT image on a LCD monitor, data must undergo what? - correct answer ✔✔digital-to-analog
conversion



a 16 slice helical/spiral scanner produces how many images from a single slice of scan data? - correct
answer ✔✔16



what operation forms the basis for CT reconstruction? - correct answer ✔✔Fourier transform



how do we solve for mAs - correct answer ✔✔mA x time



what is a common kVp for pediatric patients? - correct answer ✔✔80 kVp



If we increase our matrix from 512 x 512 to 1024 x 1024, pixel size and spatial resolution do what? -
correct answer ✔✔pixel size decreases

spatial resolution increases

, Increasing our mA in CT allows us to do what? - correct answer ✔✔allows us to lower our scan time



Decreasing pixel size does what to the number of photons? - correct answer ✔✔decreases



Decreasing pixel size does what to noise? - correct answer ✔✔increases



Which matrix will have the most pixels?

a. 80x80

b. 256x256

c. 512x512

d. 1024x1024 - correct answer ✔✔1024x1024



How many pixels would a 1024x1024 matrix contain? - correct answer ✔✔1,048,576



When a matrix size is decreased from 1024^2 to 512^2 for the same field of view, which of the following
would be true?

1. the pixels will become larger

2. the pixels will become smaller

3. there will be a greater amount of volume averaging.

4. there will be less volume averaging - correct answer ✔✔1 and 3



A two dimensional square created by the x and y axis of the matrix is called - correct answer ✔✔picture
element



The z axis runs along what? - correct answer ✔✔the length of the body



The atomic number of an object or tissue and the amount of x-ray beam attenuated demonstrates what
type of relationship? - correct answer ✔✔direct

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