First Generation CT Systems: Parallel-Beam Geometry
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First Generation CT Systems: Parallel-Beam Geometry

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Questions and Answers

What distinguishes third-generation CT scanners from second-generation scanners?

  • Translation motion and single detector
  • Multiple detectors and stationary detectors
  • Pencil beam and single detector
  • Fan beam and rotating detectors (correct)

    • Which characteristic is unique to fourth-generation CT scanners?

  • Rotating x-ray source inside a fixed detector array (correct)
  • Translation motion and single detector
  • Fan beam and rotating detectors
  • Electron beam scanning

    • What is a key feature of fifth-generation CT scanners?

  • Curved detector array with several hundred detectors
  • Fan beam and rotating detectors
  • Translation motion with multiple detectors
  • Electron beam scanning with a stationary detector array (correct)

    • How do third-generation CT scanners acquire projection data for a single image?

    <p>Using fan beam rotation with no translation motion</p> Signup and view all the answers

    Why are the reconstruction algorithms for second-generation CT scanners simpler compared to third-generation ones?

    <p>Third-generation scanners handle fan-beam projection data</p> Signup and view all the answers

    What is a characteristic of first-generation CT systems?

    <p>Use a parallel-beam geometry</p> Signup and view all the answers

    Why was the scanner in the first generation limited?

    <p>Only head scans could be performed</p> Signup and view all the answers

    What advantage does the highly collimated beam provide in first-generation CT systems?

    <p>Excellent rejection of scattered radiation</p> Signup and view all the answers

    What type of scan geometry do second-generation CT systems use?

    <p>Translate/rotate</p> Signup and view all the answers

    Why does the second generation of CT systems have an advantage over the first generation?

    <p>Faster scan time per slice</p> Signup and view all the answers

    What was one of the challenges faced by the first-generation CT systems?

    <p>Generated a lot of heat and required elaborate cooling systems</p> Signup and view all the answers

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