Basic Principles of CT Scanners: Generations of CT
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Questions and Answers

What distinguishes fifth-generation CT scanners from fourth-generation scanners?

  • The electron beam hits a fixed anode.
  • The detector array rotates around the patient.
  • The x-ray source becomes an integral part of the system design. (correct)
  • The x-ray source rotates around the patient.

Which generation of CT scanners uses a rotating x-ray source inside a fixed detector array?

  • Second generation
  • Third generation
  • Fifth generation
  • Fourth generation (correct)

In fifth-generation CT scanners, what material is the anode made of?

  • Copper
  • Aluminum
  • Steel
  • Tungsten (correct)

How do fourth-generation CT systems differ from third-generation systems?

<p>Fourth-generation systems have a rotating x-ray source inside a fixed detector array. (B)</p> Signup and view all the answers

Which type of CT scanner produces collimated fan beam x-rays with no moving parts?

<p>Fifth generation (C)</p> Signup and view all the answers

What was the significant advancement in the first-generation CT scanners?

<p>The use of a single highly collimated X-ray pencil beam and detector (A)</p> Signup and view all the answers

Which of the following statements accurately describes the evolution of CT scanners?

<p>The X-ray beam shape evolved from pencil beam to narrow beam to fan beam (C)</p> Signup and view all the answers

Who was the pioneer behind the development of the first CT scanner?

<p>Godfrey Hounsfield (B)</p> Signup and view all the answers

What was the initial application of the first CT scanner developed by Godfrey Hounsfield?

<p>Brain study (B)</p> Signup and view all the answers

Which of the following statements accurately describes the detector arrangement in first-generation CT scanners?

<p>A single detector moving in parallel with the X-ray beam (B)</p> Signup and view all the answers

What was the primary advantage of the advancements in CT scanner technology over time?

<p>Decreased scan time (C)</p> Signup and view all the answers

What was the primary limitation of first-generation CT scanners?

<p>They could only perform head scans (D)</p> Signup and view all the answers

What was the key difference between first and second-generation CT scanners?

<p>Second-generation scanners used a fan beam instead of a pencil beam (B)</p> Signup and view all the answers

What was the primary advantage of using a fan beam in second-generation CT scanners?

<p>Reduced scan time (A)</p> Signup and view all the answers

In first-generation CT scanners, how was the translation and rotation motion achieved?

<p>Both the source and the detector translated and rotated around the patient (C)</p> Signup and view all the answers

What was the purpose of the highly collimated beam in first-generation CT scanners?

<p>To reject scattered radiation from the patient (B)</p> Signup and view all the answers

What was the approximate scan time for a single slice in second-generation CT scanners?

<p>20 seconds (B)</p> Signup and view all the answers

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