The x-ray tube
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What is the name of the most frequently used support system? | ceiling support
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| What components make up the external structure of the x-ray tube? | support structure, protective housing, glass or metal enclosure
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| The ______ _______ provides mechanical support. | protective housing
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| What is the positive side of the x-ray tube called? | anode
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| What is the negative side of the x-ray tube called? | cathode
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| This occurs when the tungsten vaporizes,coats the inside of the glass housing, and then causes the current to stray. | arcing
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| What are the 2 parts of the cathode? | filament, focusing cup
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| What is the most common cause of tube failure? | tungsten vaporization
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| What is the filament made of? | tungsten
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| The boiling off of electrons is known as? | thermonic emission
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| What is the target of a rotating anode coated with? | tungsten
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| What does thermonic emission cause to happen at the filament? | space charge effect
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| WHat is the actual source of x-rays in the tube? | the focal spot
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| What is the size of most filaments? | 1-2 cm long, 2mm wide
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| When is the small focal spot used? | when better spatial resolution is required
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| What turns the rotating anode? | magnetic field
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| Name the 2 types of anodes. | stationary and rotating
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| How much of the electron interaction with the anode turned into heat? | 99%
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| What is the target of the anode? | the area of the anode struck by electrons from the cathode
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| What is a rotating anode made of? | tungsten alloy
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| High capacity tubes rotate at up to ________ rpm. | 10,000
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| What components make up the induction motor? | rotor, stator
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| what is the rotor? | a shaft made of copper and soft iron
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| What is the stator? | a series of magnets placed around the neck of the tube
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| What is the anode heel effect? | When the intensity is greater on the cathode side than the anode
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| The smaller the ______ the greater the heel effect. | angle
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| When imaging a larger patient, the ______ should be directed over the larger part. | cathode
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| Due to the line focus principle, the target angle is made _______, so the effective focal spot is ________. | smaller, smaller
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| What is the formula for Heat units of a 3phase 6 pulse x-ray machine? | 1.41 X kVp X mA X s
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| What does it mean when a tube has 2 focal spot sizes or a dual tube? | it has 2 filaments
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| What does each tube rating charts have in common with one another? | they are all the maximum eposure times that is safe for the tube
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| Where is the stator located in the x-ray tube? | outside the glass enclosure
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| Where is the rotor located in the x-ray tube? | inside the glass enclosure behind the anode
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| What causes the anode heel effect? | the angle of the stationary anode
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| This occurs when the electrons bounce off the focal spot and land on other areas of the target, causing x-rays to be produced outside the focal spot(scatter). | off focus radiation
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| The actual focal spot size is ______ than the effective focal spot size in the line focus principle. | larger than
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| When the anode has pits or cracks in it, what caused this? | the temp of the anode is excessive during a single exposure
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