CT Scan First Generation

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Questions and Answers

What characterizes First-generation CT systems?

  • Multiple X-ray sources
  • Rotating X-ray source and detector
  • Stationary X-ray source and detector
  • Single X-ray source (pencil beam or parallel-beam geometry) (correct)

What happens during the scan process in First-generation CT systems?

  • The source and detector move in opposite directions
  • The source translates in a linear motion across the patient (correct)
  • The detector is stationary and the source moves in a circular motion
  • The source and detector rotate simultaneously in a scan plane

What is an advantage of First-generation CT systems?

  • Low cost
  • Ability to scan entire body
  • Flexibility in the choice of scan parameters (correct)
  • Fast scan time

What is a limitation of First-generation CT systems?

<p>Scan time is very slow (B)</p> Signup and view all the answers

What is generated during the operation of First-generation CT systems?

<p>A lot of heat (D)</p> Signup and view all the answers

What type of scans can be performed using First-generation CT systems?

<p>Only head scans (A)</p> Signup and view all the answers

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Study Notes

First-Generation CT Systems

  • Characterized by single X-ray source with parallel-beam geometry
  • Uses a single highly collimated X-ray pencil beam and detector directed across the patient isocenter
  • Multiple measurements of X-ray transmission obtained by translating X-ray source and detector simultaneously in a scan plane
  • Beam translated in a linear motion across the patient to obtain a projection profile
  • Process repeated for a given number of angular rotations (approximately 1 degree) until source and detector rotated by 180 degrees
  • Advantages:
    • Simplicity
    • Good view-to-view detector matching
    • Flexibility in choosing scan parameters (resolution and contrast)
    • Highly collimated beam provides excellent rejection of scattered radiation
  • Limitations:
    • Only head scans can be performed
    • Generates a lot of heat, requiring elaborate cooling system
    • Scan time is very slow (about 1 minute per slice, averaging 25-30 minutes per scan)

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