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Bushong Ch 6

The Xray Tube

Which term refer to the primary radiation used to form the image useful beam
What is the formula for calculated heat units on a 3-phase system kVP * mAs *1.4
When the filament current has risen to its maximum value because all available electrons have been used saturation current
The transfer of heat by the movement of hot matter to a colder place defines: convection
The positive side of the xray tube is the anode
The negative side of the xray tube is the cathode
The speed of the anode is calculated in rpms (rotations/revolutions per minute). Which rpms do you see when viewing various rating charts? 3400 and 10000
What materials are used in the anodes of xray tubes? copper, graphite, molybdenum
What are the external components of the xray tube? protective housing, glass or metal enclosure, support structure
Where is the stator located? Just outside the glass or metal enclosure of the tube, surrounding the rotor.
What are causes of xray tube failure? excessive and prolonged anode heating, high exposure on a cold anode, excessive anode temperature, tungsten vaporization due to excessive tube arcing
What are the functions of the anode? electrical conductor, mechanical support, thermal dissipater
What material is added to the filament to increase the efficiency of thermionic emission and prolong the life of the xray tube? thorium
What utilizes the angle of the anode to provide a more spacious target area and accommodate a higher heat load. line focus principle
The line focus principle provides a __________ effective focal spot size smaller
What is the effective focal spot? the area on the patient to which the beam is projected
Which portion of the xray tube is the negatively charged metal shroud that surrounds the filament? focusing cup
What are the parts of the cathode? filament and focusing cup
What are the functions of the protective housing of the xray tube? guarding against electric shock, shielding from excessive radiation exposure, mechanical support and protection
What does the anode angle have to do with the anode heel effect? the smaller the angle, the greater the heel effect
What is the vaporization of tungsten within the tube termed arcing
When electrons repel, they form a cloud around the filament making it difficult for electrons to be emitted because of electrostatic repulsion space charge effect
The area on the target where electrons are emitted focal spot
What is the anode heel effect based on the angle of the target, greater intensity on the cathode side of the beam
What powers the rotating anode electromagnetic induction motor
What is the main advantage of the induction motor reduces "coast time"
Created by: lkdickson
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