X-Ray Tube Anode and Cathode Assembly

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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?

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. (D) 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?

All of the above (D) Signup and view all the answers

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

To allow the anode disk to rotate and distribute the heat load (B) 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?

It can sustain higher power levels for longer durations. (B) Signup and view all the answers

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

The anode assembly including anode rotation (C) Signup and view all the answers

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

Electrical arcing can result from tungsten deposits on the glass. (A) Signup and view all the answers

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

It solves the problem of electrical arcing caused by tungsten deposits. (A) 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?

Detector array (D) 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?

The upgraded tube has a larger anode disk diameter. (A) Signup and view all the answers

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

To improve heat conduction between the anode disk and the liquid (D) 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?

It accommodates large, lightweight disks with fast cooling rates (D) 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?

To enable the metal to flow smoothly into the joint (A) Signup and view all the answers

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

Bearing assembly (D) 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?

Provides large heat-storage capacity and fast cooling rates (C) Signup and view all the answers

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

By providing smoother rotation and improved heat conduction (C) Signup and view all the answers