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RADT 334

unit 6

QuestionAnswer
What is the negative side of the x-ray tube? Cathode
coil of wire that emits electrons filament
What is the positive side of the x-ray tube? Anode
What is the anode most commonly made of? Tungsten, Molybdenum, Graphite
What is the purpose of the protective housing? guard against excessive radiation and electric shock
What are the primary parts of the cathode? filament and focusing cup
What is the most common cause of tube failure? tungsten vaporization
T/F glass enclosures are better than metal enclosures false
these enclosure tubes maintain a constant electric potential between the electrons of the tube current and the enclosure metal
What are filaments usually made of? thoriated tungsten
Why is tungsten used for filaments? higher thermionic emission, melting point of 3410 degrees Celsius, does not easily vaporize
Which focal spot is used for better spatial resolution? small focal spot
Which focal spot is used for large body parts? large focal spot
Which focal spot uses an mA of 300 or lower? small focal spot
Which focal sport uses an mA of 400 or more? large focal spot
How is focal spot size selected? using the mA station selector on the operating console
What are the two types of anodes? stationary and rotating
this type of anode is used for dental x-ray imaging and some portable imaging systems stationary
This type of tube is used for general-purpose x-ray tubes rotating
Rotating anodes produce ______ x-ray beams high-intensity
What purpose does the anode serve? an electrical conductor, radiates heat, and contains the target
This results in a smaller effective focal spot size that the actual focal spot size line-focus principle
What are two advantages of the line-focus principle? improves spatial resolution and heat capacity
According to the Anode Heel Effect, is the intensity more or less on the cathode side? more
What causes Anode Heel Effect? The x-rays emitted toward the anode side must traverse a greater thickness of target material than those directed toward the cathode
The _____ the anode angle, the larger the heel effect smaller
How can x0ray tube life be extended? use minimum radiographic factors and the use of faster image receptors
What is a cause of tube failure? high temperatures can cause melting and pitting
What is another cause of tube failure? maintaining high temperatures for long periods of time
What chart is used to determine how much technique is safe for tube operation? x-ray tube rating chart
What chart is used to determine how long you should let the tube cool before making another exposure? cooling chart
Created by: brooke91