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Bushong ch 7

The x-ray tube

QuestionAnswer
What is the name of the most frequently used support system? ceiling support
What components make up the external structure of the x-ray tube? support structure, protective housing, glass or metal enclosure
The ______ _______ provides mechanical support. protective housing
What is the positive side of the x-ray tube called? anode
What is the negative side of the x-ray tube called? cathode
This occurs when the tungsten vaporizes,coats the inside of the glass housing, and then causes the current to stray. arcing
What are the 2 parts of the cathode? filament, focusing cup
What is the most common cause of tube failure? tungsten vaporization
What is the filament made of? tungsten
The boiling off of electrons is known as? thermonic emission
What is the target of a rotating anode coated with? tungsten
What does thermonic emission cause to happen at the filament? space charge effect
WHat is the actual source of x-rays in the tube? the focal spot
What is the size of most filaments? 1-2 cm long, 2mm wide
When is the small focal spot used? when better spatial resolution is required
What turns the rotating anode? magnetic field
Name the 2 types of anodes. stationary and rotating
How much of the electron interaction with the anode turned into heat? 99%
What is the target of the anode? the area of the anode struck by electrons from the cathode
What is a rotating anode made of? tungsten alloy
High capacity tubes rotate at up to ________ rpm. 10,000
What components make up the induction motor? rotor, stator
what is the rotor? a shaft made of copper and soft iron
What is the stator? a series of magnets placed around the neck of the tube
What is the anode heel effect? When the intensity is greater on the cathode side than the anode
The smaller the ______ the greater the heel effect. angle
When imaging a larger patient, the ______ should be directed over the larger part. cathode
Due to the line focus principle, the target angle is made _______, so the effective focal spot is ________. smaller, smaller
What is the formula for Heat units of a 3phase 6 pulse x-ray machine? 1.41 X kVp X mA X s
What does it mean when a tube has 2 focal spot sizes or a dual tube? it has 2 filaments
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
Where is the stator located in the x-ray tube? outside the glass enclosure
Where is the rotor located in the x-ray tube? inside the glass enclosure behind the anode
What causes the anode heel effect? the angle of the stationary anode
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
The actual focal spot size is ______ than the effective focal spot size in the line focus principle. larger than
When the anode has pits or cracks in it, what caused this? the temp of the anode is excessive during a single exposure
Created by: radgirl37 on 2011-02-24



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