Pitch in CT Scans
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Questions and Answers

Which generation of CT scanners used a slice-by-slice image acquisition technique?

  • Second
  • Fourth (correct)
  • Third
  • First

    • What is one limitation of conventional slice-by-slice CT scanning?

  • Longer inter-scan delay times
  • Slice-to-slice misregisteration
  • Inaccurate generation of 3-D images
  • All of the above (correct)

    • What can be missed in slice-by-slice CT scanning due to inconsistent breathing?

  • Tumors
  • Large lesions
  • Small lesions (correct)
  • Bone fractures

    • Which generation of CT scanners solved the problem of inter-scan delays through continuous rotation of the x-ray tube?

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

    What type of motion geometry does the spiral (helical) CT scanner use?

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

    What is the main advantage of the spiral (helical) CT scanner over conventional slice-by-slice scanning?

    <p>Faster scanning speed</p> Signup and view all the answers

    Which generation of CT scanners introduced the spiral (helical) technique?

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

    Which technology is required for data transfer from the rotating gantry in Spiral CT scanners?

    <p>Slip rings</p> Signup and view all the answers

    What is the major advantage of slip-ring technology in CT scanners?

    <p>Faster scan times and minimal interscan delays</p> Signup and view all the answers

    What is the formula to calculate the pitch in spiral CT scanners?

    <p>Pitch = Table feed or travel (mm) / slice thickness</p> Signup and view all the answers

    What is the pitch ratio in spiral CT scanners when the table travels a distance equal to slice thickness or beam collimation?

    <p>1:1</p> Signup and view all the answers

    What is the typical range of pitch values in spiral CT scanners?

    <p>1 to 2</p> Signup and view all the answers

    What are the effects of increasing the pitch in spiral CT scanners?

    <p>Scan times will be reduced</p> Signup and view all the answers

    What is the volume coverage in spiral CT scanners?

    <p>Volume coverage = pitch x slice thickness</p> Signup and view all the answers

    Which of the following is true about pitch in CT scanning?

    <p>Pitch = 1 means patient moves exactly one slice thickness per revolution of tube table motion during one tube rotation</p> Signup and view all the answers

    What is the effect of pitch on dose in CT scanning?

    <p>Dose is inversely proportional to pitch</p> Signup and view all the answers

    What are the advantages of spiral CT scanning?

    <p>Scans complete volume of tissue in very short scan times</p> Signup and view all the answers

    What are the limitations of spiral CT scanning?

    <p>Requires X-ray tubes with higher thermal capacity and cooling rates</p> Signup and view all the answers

    What is the basic idea behind multislice spiral CT?

    <p>To widen the x-ray beam in the z-direction and use multiple rows of detectors to collect data for more than one slice at a time</p> Signup and view all the answers

    What are the advantages of a multislice CT scanner?

    <p>Improved volume coverage and faster scan times</p> Signup and view all the answers

    What is the primary difference between single-slice CT and multislice CT hardware?

    <p>In multislice CT, there are multiple parallel rows of detectors instead of a single row</p> Signup and view all the answers

    Which type of CT scanner uses a wider diverging cone beam instead of a fan beam?

    <p>Bager 36 Cone beam geometry</p> Signup and view all the answers

    What determines the slice thickness in single detector array CT systems?

    <p>Physical collimation of the incident x-ray beam</p> Signup and view all the answers

    Which clinical application involves collecting up to 64 (128 - 256) slices simultaneously?

    <p>Multislice CT</p> Signup and view all the answers

    What is the effect of increasing the pitch by a factor of 4 in a dual-slice CT scanner?

    <p>Increased volume coverage in less time with no loss of image quality</p> Signup and view all the answers

    What determines the slice thickness of multiple detector array CT scanners?

    <p>Width of the detectors in the slice thickness dimension</p> Signup and view all the answers

    Which technology is required for data transfer from the rotating gantry in spiral CT scanners?

    <p>Slip-ring technology</p> Signup and view all the answers

    Which generation of CT scanners introduced the spiral (helical) technique?

    <p>Bager 38</p> Signup and view all the answers

    What is the main advantage of the spiral (helical) CT scanner over conventional slice-by-slice scanning?

    <p>Greater volume coverage</p> Signup and view all the answers

    What is the typical range of pitch values in spiral CT scanners?

    <p>1.0-2.0</p> Signup and view all the answers

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