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35 Cards in this Set
- Front
- Back
What are the four essential elements required for x-ray production?
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A target, a vacuum, an electron source, and a high potential difference
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The target of the X-ray tube is made of?
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Tungsten
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A device for removing long wavelength radiation from the primary beam is?
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Filter
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The process of making an "electron cloud" surrounding a hot cathode is referred to as?
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Thermionic Emission
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The greatest portion of the x-ray beam is made up of?
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Bremsstrahlung radiation
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Below what KVp level is characteristic radiation no longer produced?
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70 KVp
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What is required to move the electron stream rapidly across the x-ray tube?
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High potential difference
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What percentage of the total energy applied to an x-ray tube target is converted into x-rays
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Less than 1%
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What types of radiation are produced at the anode?
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Characteristic and Bremsstrahlung Radiation
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what type of radiation is produced by the sudden slowing and direction change of the electron stream as kinetic energy is converted to other energy forms?
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Bremsstrahlung radiation
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What type of radiation is formed within the target atoms as a result of interactions with the K shell electrons?
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Characteristic Radiation
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The purpose of rotating the x-ray tube target is to?
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Increase the heat capacity of the anode
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A smaller effective focal spot will yield?
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Greater image sharpness
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A larger actual focal spot size will yield?
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Greater tube heat capacity
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The anode heel effect is a phenomenon of x-ray production that results in ?
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Uneven distribution of radiation within the field
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The penetrating power of the x-ray beem is controlled by varying the?
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Kilovoltage
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The MAs used for an exposure determines the?
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Quantity of radiation in the exposure
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An x-ray exposure is made using the following factors: 400 mA .02 Sec, 80 KVp, 40 inches SID and the large focal spot, in this case, the value of mAs is
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80 mAs
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Tungsten has a high melting point? True or False?
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True
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The added filtration required for general-purpose diagnostic x-ray units that have 0.5 mm Al equivalent of inherent filtration is?
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2.0 mm Al equivalent
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What is the primary advantage of x-ray beam filtration?
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Lowers the patient dose
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A steeper target angle provides?
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Smaller effective focal spot
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Filtration_____?_____ the average wavelength of the x-ray beam.
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Decreases
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The filament is made out of what and is on the cathode or the anode side?
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Tungsten and is on the Cathode side
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99% of kinetic energy is converted into?
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Heat
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What radiation occurs above 70 kVp?
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Characteristic Radiation
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What radiation occurs below 69 kVp?
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Bremsstrahlung Radiation
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What is the purpose of the rotating anode?
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To dissapate heat
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Using the anode heel effect always put the thicker body part where? Cathode or Anode?
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Cathode
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The penetrating power of the x-ray beam is varyied by?
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The kVps
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The unit used to indicate the quantity of exposure is?
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Milliampere-seconds or mAs
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What is used to measure the rate of current flow across the x-ray tube?
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Milliamperage
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the process of removing the long-wavelength photons from the x-ray beam
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Filtration
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How much filtration is inherent (built in)?
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0.5mm Al equiv.
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What is the total filtration for an x-ray machine?
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2.5mm Al equiv.
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