Image Formation and Processing in Computed Tomography
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Questions and Answers

What is the primary function of an analog-to-digital converter (ADC) in a digital computer?

  • To display the output digital image on a monitor
  • To convert analog signals into digital signals (correct)
  • To convert digital signals into analog signals
  • To process the digital image

    • What does each pixel in a digital image represent?

  • The average attenuation of all tissue being imaged (correct)
  • The brightness level of a single tissue type
  • The size of the pixel in the image
  • The color of the tissue being imaged

    • What is the effect of decreasing the Field of View (FOV) on pixel size, assuming the matrix size is constant?

  • The pixel size decreases (correct)
  • The pixel size becomes undefined
  • The pixel size increases
  • The pixel size remains the same

    • What is the purpose of converting the output digital image back into an analog signal?

    <p>To display the image on a monitor</p> Signup and view all the answers

    What is the formula to calculate the pixel size?

    <p>Pixel size = FOV / Matrix size</p> Signup and view all the answers

    What can be adjusted to alter the image contrast and brightness in computed tomography?

    <p>Window Width and Window Level</p> Signup and view all the answers

    What is the formula to calculate the upper grey level in computed tomography?

    <p>WL + (WW ÷ 2)</p> Signup and view all the answers

    What is the purpose of post-processing in computed tomography?

    <p>To manipulate raw data and image data</p> Signup and view all the answers

    What is the lower grey level when the Window Level is 0 and the Window Width is 1000?

    <p>-500</p> Signup and view all the answers

    What is the name of the window with a Window Width of 150 and a Window Level of 600?

    <p>Lung window</p> Signup and view all the answers

    What will be the value of the upper grey level when the Window Level is 80 and the Window Width is 40?

    <p>120</p> Signup and view all the answers

    What is the typical window width value used to image the mediastinum?

    <p>350</p> Signup and view all the answers

    What is the effect of a narrow window width on an image?

    <p>It decreases the number of shades of grey</p> Signup and view all the answers

    What is the purpose of adjusting the window width and level in CT imaging?

    <p>To optimize the image quality for a specific area of interest</p> Signup and view all the answers

    What is the typical window level value used to assess the lung fields?

    <p>-600</p> Signup and view all the answers

    What is the effect of a wide window width on an image?

    <p>It decreases the contrast between different structures</p> Signup and view all the answers

    Which of the following structures has a high attenuation value?

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

    What is the main advantage of Volume Rendering in Computed Tomography?

    <p>It allows the image to display multiple tissues and their relationship to one another.</p> Signup and view all the answers

    Which 3D image technique is favored in Computed Tomography?

    <p>Volume Rendering (VR)</p> Signup and view all the answers

    What is the main characteristic of 3D Maximum Intensity Projection (MIP) Rendering?

    <p>It selects pixels with highest attenuation value along any arbitrary line.</p> Signup and view all the answers

    What is the result of using 3D Maximum Intensity Projection (MIP) Rendering in Computed Tomography?

    <p>It tends to display bone and contrast filled structures.</p> Signup and view all the answers

    What is the purpose of 3D Minimum Intensity Projection (MinIP) Rendering in Computed Tomography?

    <p>To reconstruct an image by selecting the pixels with lowest attenuation value from the line.</p> Signup and view all the answers

    What is the purpose of defining a Region of Interest (ROI) on an image?

    <p>To perform statistical calculations such as mean and standard deviation</p> Signup and view all the answers

    Which of the following is a function of the 'tools' in image display?

    <p>Region of Interest (ROI) definition</p> Signup and view all the answers

    What is the unit of measurement for average CT numbers?

    <p>Hounsfield Units (HU)</p> Signup and view all the answers

    What is the purpose of a histogram in Computed Tomography?

    <p>To display the distribution of CT numbers</p> Signup and view all the answers

    What is the term for the area on the image defined by the operator for statistical calculations?

    <p>Region of Interest (ROI)</p> Signup and view all the answers

    What is the benefit of using Virtual Reality (VR) and Maximum Intensity Projection (MIP) in image display?

    <p>To enhance the visualization of complex structures</p> Signup and view all the answers

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