CT Image Quality and Noise in Computed Tomography
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Questions and Answers

What is the relationship between tube current (mA) and image noise in CT imaging?

  • Tube current and image noise are directly proportional.
  • Tube current has no effect on image noise in CT.
  • The relationship between tube current and image noise is complex and depends on other factors.
  • Tube current and image noise are inversely proportional. (correct)

    • How does increasing the scan time affect image noise in CT imaging?

  • Increasing the scan time has no effect on image noise.
  • Increasing the scan time increases image noise.
  • The effect of scan time on image noise depends on other factors.
  • Increasing the scan time decreases image noise. (correct)

    • What is the relationship between slice thickness and the number of x-rays reaching the detector in CT imaging?

  • Increasing slice thickness decreases the number of x-rays reaching the detector.
  • Increasing slice thickness has no effect on the number of x-rays reaching the detector.
  • Increasing slice thickness increases the number of x-rays reaching the detector. (correct)
  • The relationship between slice thickness and the number of x-rays reaching the detector is complex and depends on other factors.

    • How does patient size affect image noise in CT imaging?

    <p>Larger patient size increases image noise.</p> Signup and view all the answers

    What is the combined effect of tube current and scan time on image noise in CT imaging?

    <p>Tube current and scan time have a multiplicative effect on image noise.</p> Signup and view all the answers

    Which of the following CT technique factors has the most significant impact on image noise?

    <p>Tube current and scan time (mAs)</p> Signup and view all the answers

    What effect does increasing slice thickness have on image noise?

    <p>Decreases image noise</p> Signup and view all the answers

    How does increasing tube voltage (keV) affect image noise?

    <p>Decreases image noise</p> Signup and view all the answers

    What effect does decreasing tube voltage (keV) have on image noise and contrast?

    <p>Increases image noise and decreases contrast</p> Signup and view all the answers

    How do patient factors affect image noise?

    <p>Larger patients result in more image noise</p> Signup and view all the answers

    What is the effect of using a sharp (bone) reconstruction filter on image noise?

    <p>Enhances the appearance of image noise</p> Signup and view all the answers

    What is the effect of reducing the mAs value on image noise?

    <p>Increases image noise</p> Signup and view all the answers

    What is the primary cause of image noise in computed tomography (CT)?

    <p>Variations in the CT numbers of a uniform material</p> Signup and view all the answers

    How is the signal-to-noise ratio (SNR) related to image noise in CT?

    <p>A lower SNR indicates less noise in the image</p> Signup and view all the answers

    What is the effect of image noise on contrast resolution in CT?

    <p>Decreases contrast resolution by hindering the ability to distinguish details</p> Signup and view all the answers

    Which factor primarily determines the degree of image noise in CT?

    <p>The number of X-ray photons contributing to the image</p> Signup and view all the answers

    In CT imaging, what is the conventional average CT number for water?

    <p>0</p> Signup and view all the answers

    What is the visual manifestation of image noise in CT?

    <p>Grainy appearance on the cross-sectional image</p> Signup and view all the answers

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