Formation of a CT Image - Tomographic Acquisition
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Questions and Answers

What is the range of the floating point numbers resulting from the CT reconstruction process?

  • From 0.0 to 1.0 (correct)
  • From -300 to -90
  • From -1000 to 3095
  • From -90 to +3000

    • Which of the following represents the CT number for water in the patient?

  • -1000
  • 30
  • 0 (correct)
  • -90

    • For dense bone and areas with high contrast agent, what is the approximate range of CT numbers?

  • +30 to +3000 (correct)
  • -1000 to 3095
  • 0 to 50
  • -300 to -90

    • How are CT images normalized and truncated for clinical use?

    <p>To a range between -1000 and 3095</p> Signup and view all the answers

    What does a CT(x,y) number in an image represent?

    <p>The Hounsfield unit at that point</p> Signup and view all the answers

    How does the CT number in a pixel relate to the attenuation coefficient for that voxel?

    <p>They are directly proportional</p> Signup and view all the answers

    Which physical property of tissue influences Compton scatter in CT images?

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

    What is the role of the linear attenuation coefficient in forming contrast in medical CT?

    <p>It plays a dominant role in forming contrast based on tissue density</p> Signup and view all the answers

    What does the window width determine in CT imaging?

    <p>The contrast of the image</p> Signup and view all the answers

    How are helical CT data sets interpolated to compensate for differences in source paths?

    <p>Interpolated into a series of planar image data sets</p> Signup and view all the answers

    What is the purpose of Helical CT scanning producing a helical trajectory around the patient?

    <p>To reduce patient dose</p> Signup and view all the answers

    In CT imaging, how does slice thickness affect the contrast produced from an object?

    <p>It produces greater contrast from background when positioned at the center of the CT slice</p> Signup and view all the answers

    What is true about detector arrays used in modern CT systems?

    <p>They use solid-state scintillator detectors</p> Signup and view all the answers

    What is the purpose of the convolution technique in CT image reconstruction?

    <p>To remove noise and produce sharper images</p> Signup and view all the answers

    Which algorithm is known for providing fine detail in CT images but with increased noise?

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

    What does a sharp filter do in CT image reconstruction?

    <p>Enhances spatial resolution</p> Signup and view all the answers

    How are pixels and voxels related in a CT image?

    <p>The pixel width and height are equal to the voxel width and height</p> Signup and view all the answers

    Which step precedes the application of the CT reconstruction algorithm in CT image formation?

    <p>Preprocessing of raw data</p> Signup and view all the answers

    What is the main function of filtered back projection in CT image reconstruction?

    <p>To build up the CT image in the computer</p> Signup and view all the answers

    Which technique is used to blur raw data during CT image formation?

    <p>Convolution technique</p> Signup and view all the answers

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