X-Ray Tube Anode and Cathode Assembly
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Questions and Answers

Which of the following is a key advantage of the brazed graphite anode disk design over the conventional all-metal disk?

  • Reduced weight, making it more suitable for spiral/helical CT imaging
  • Increased heat-storage capacity due to the high thermal capacity of graphite (correct)
  • Faster heat dissipation rates from the focal track
  • Improved focusing of the electron beam on the anode surface
  • What is the primary purpose of the focusing cup in the cathode assembly?

  • To focus the electron beam onto the anode surface (correct)
  • To dissipate heat generated in the cathode
  • To control the tube current and voltage
  • To increase the heat-storage capacity of the cathode
  • Which of the following is a key advantage of the chemical vapor deposition (CVD) graphite anode disk design over the brazed graphite disk?

  • Increased heat-storage capacity due to the high thermal capacity of graphite
  • The text does not provide any information about the advantages of the CVD graphite anode disk design over the brazed graphite disk (correct)
  • Faster heat dissipation rates from the focal track
  • Reduced weight, making it more suitable for spiral/helical CT imaging
  • How does the material used in the brazing process for the brazed graphite anode disk influence the operating temperature of the tube?

    <p>The material used in the brazing process influences the operating temperature of the tube, and higher temperatures result in higher heat-storage capacities and faster cooling of the anode.</p> Signup and view all the answers

    Which of the following is a key disadvantage of the conventional all-metal anode disk design compared to the brazed graphite disk?

    <p>All of the above</p> Signup and view all the answers

    What is the primary purpose of the rotor and bearing assembly in the anode assembly?

    <p>To allow the anode disk to rotate and distribute the heat load</p> Signup and view all the answers

    What is a key advantage of the upgraded x-ray tube shown in Fig. 6B compared to the conventional tube in Fig. 6A?

    <p>It can sustain higher power levels for longer durations.</p> Signup and view all the answers

    Which component of the x-ray tube has been redesigned to deal with heat generation and dissipation issues?

    <p>The anode assembly including anode rotation</p> Signup and view all the answers

    What is a disadvantage of using a glass envelope in x-ray tubes?

    <p>Electrical arcing can result from tungsten deposits on the glass.</p> Signup and view all the answers

    What is a potential advantage of using a metal envelope in x-ray tubes?

    <p>It solves the problem of electrical arcing caused by tungsten deposits.</p> Signup and view all the answers

    Which of the following components has NOT been explicitly mentioned as being redesigned in the upgraded x-ray tube?

    <p>Detector array</p> Signup and view all the answers

    What is a key difference between the anode disks in the upgraded x-ray tube (Fig. 6B) and conventional tubes?

    <p>The upgraded tube has a larger anode disk diameter.</p> Signup and view all the answers

    What is the purpose of using a liquid-bearing method in modern CT x-ray tubes?

    <p>To improve heat conduction between the anode disk and the liquid</p> Signup and view all the answers

    What is a characteristic of the anode disk design with a tungsten-rhenium layer deposited on the focal track?

    <p>It accommodates large, lightweight disks with fast cooling rates</p> Signup and view all the answers

    Why is the filler metal used in metal-joining processes required to have a lower melting point than the adjoining metal?

    <p>To enable the metal to flow smoothly into the joint</p> Signup and view all the answers

    Which component of the x-ray tube assembly is responsible for ensuring smooth rotation of the anode disk?

    <p>Bearing assembly</p> Signup and view all the answers

    What advantage does the CVD graphite anode disk design offer over conventional designs for spiral/helical CT x-ray tubes?

    <p>Provides large heat-storage capacity and fast cooling rates</p> Signup and view all the answers

    How does the liquid-bearing technology contribute to improving the performance of modern CT x-ray tubes?

    <p>By providing smoother rotation and improved heat conduction</p> Signup and view all the answers

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