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