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Exposure Factors

Chapter 5 - the Xray Tube

QuestionAnswer
The physical area of the focal track that is impacted actual focal spot
The positive side of the x-ray tube; serves as a target surface for high-voltage electrons from the filament, conducts the high voltage from the cathode back into the x-ray generator circuitry, and serves as the primary thermal conductor. anode
Consists of the anode, stator, and rotor. anode assembly
Permits the calculation of the time necessary for the anode to cool enough for additional exposures to be taken anode cooling charts
Due to the geometry of the angled anode target, the radiation intensity is greater on the cathode side, this is known as? anode heel effect
The negative side of the xray tube; produces a thermionic cloud, conducts the high voltage to the gap between the cathode and the anode, and focuses the electron stream as it heads for the anode. cathode
Consists of the filament, focusing cup, and associated wiring? cathode assembly
A two-filament arrangement within the xray tube dual-focus
The area of the focal spot that is projected out of the tube toward the object being radiographed effective focal spot
The entire cathode and anode assembly is housed within this glass or metal structure envelope
Photons that were not produced at the focal spot; also called off-focus radiation. extrafocal radiation
A small coil of thin thoriated tungsten wire filament
The portion of the anode where the high-voltage electron stream will impact? focal point
The portion of the anode where the high-voltage electron stream will impact; describes the circular path that will be impacted by the electron beam. focal track
A shallow depression in the cathode assembly designed to house the filament focusing cup
A very small focal spot; usually a fraction of a millimeter in size. fractional focal spot
A type of tube that quickly regulates the flow of electrons, producing x-ray photons. grid-controlled
Permits the calculation of the time necessary for the housing to cool enough for additional exposures to be made. housing cooling charts
Any photons that escape from the housing except at the port leakage radiation
Used to reduce the effective area of the focal spot line-focus principle
Photons that were not produced at the focal-spot; also called extrafocal radiation. off-focus radiation
The entire cathode and anode assembly is housed within this metal structure? protective housing
A guide regarding the most common technical factor combinations that can be used without overloading the tube radiographic tube rating charts
An anode assembly that turns during exposure rotating anodes
As kVp increases, a greater percentage of the thermionically emitted electrons are driven toward the anode saturation current
As more and more electrons build up in the area of the filament, their negative charges begin to oppose the emission of additional electrons. space charge effect
An anode assembly that is immobile stationary anodes
The portion of the anode where the high-voltage electron stream will impact the target
Provides a guide regarding the most common technical factor combinations that can be used without overloading the tube tube rating charts
A structure where the primary x-ray beams exit the envelope, which allows less absorption or scatter of photons. window
The parts within the cathode assembly that connect the elements of the assembly wiring
A two-filament arrangement within the x-ray tube dual focus
Photons that were not produced at the focal spot; also called extrafocal radiation. off-focus
Photons that were not produced at the focal spot; also called off-focus radiation. extrafocal, radiation
Atomic number of Molybdenum 42
The choice of metal for the source of x-ray photons because it has a high atomic number, a high melting point, and good heat conducting ability? Tungsten
What is the average life of the diagnostic x-ray tube filament? 6-9 hours
What is described as a shallow depression in the cathode assembly? Focusing cup
Which term represents the circular path that will be impacted by the electron beam? Focal Track
What is the most common diagnostic radiography target angle? 12 degrees
What is the only part of the cathode or anode that is outside the vacuum of the envelope? stator
What is the key function of the envelope? maintaining vacuum
What must be used to fill the space between the envelope and the tube housing? dielectric oil
What would be an example of how to extend tube life? do not make repeat exposures near tube loading limits
Exposure Factors Chapter 5 - The X-ray Tube
Popular Radiology sets

 

 



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