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RADT 334 X-Ray Tube

Radiographic Physics review covering x-ray tube

QuestionAnswer
What system is an external component of the x-ray tube that consists of the floor to ceiling, ceiling and c-arm? support system
What makes up the enclosure component in the external component of the x-ray tube? glass and metal
What part of the internal component of the x-ray tube contains the filament(s) and focusing cup? cathode
What are the parts of the anode in the internal component of the x-ray tube? rotating and stationary
What part of the x-ray tube controls leakage and scatter radiation, isolates the high voltages and provides a means to cool the tube? protective housing
The x-ray tube is a vacuum containing two electrodes (cathode and anode), what maintains this vacuum? enclosure
What is the negative side of the x-ray tube? cathode
What is the coil of wire that emits electrons when heated? filament
Where is the filament embedded? focusing cup
The focusing cup is negatively charged to keep the ________ to a small area of the anode. electron beam
What is the space charge called? (when the electrons are in the vicinity of the filament before acceleration to the anode) electron cloud
When the cloud of electrons makes it hard for subsequent electrons to be emitted because of electrostatic repulsion this is referred to as _________. space charge effect
When the tube current rises with increasing voltage to a maximum value, this is referred to as the ________. saturation current
When better spatial resolution is required what focal spot would you want? small
What focal spot would you use when large body parts are imaged and when higher techniques are used that will generate high heat? large
What is the positive side of the x-ray tube? anode
What are the three functions of the anode? electrical conductor, mechanical support for the target and thermal dissipater
Which material of the anode contains a high atomic number, thermal conductivity and a high melting point? tungsten
Which materials of the anode have a lower mass density and a high melting point? molybdenum and graphite
Where are x-rays emitted? the focal spot
An angled target allows for a larger area for heating while maintaining a _______. small focal spot
The effective focal spot is the area projected onto the _____ and ______. patient and image receptor
Where are the electrons interacting with the target? actual focal spot
When the intensity of the x-ray beam is weaker on the anode side, this is called? anode heel effect
What three areas on the patient can being aware of the anode heel effect allow for correction resulting in a better image? foot, chest and abdomen
What type of radiation reduces image contrast, increases skin dose, extends the size of the focal spot and are produced outside of the focal spot? extrafocal radiation
What is the most frequent cause of abrupt failure in an x-ray tube? electron arcing
Excessive heat results in what to the x-ray tube? reduced tube life
What are the three types of rating charts? radiographic rating chart, anode cooling chart and housing cooling chart
Created by: sadugan