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Sherer Ch2

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
amount of energy absorbed per mass unit   show
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glass and aluminum in the housing assembly comprise this   show
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show primary radiation  
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show 1/3 the kVp selected  
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reduction of the number of primary photons in the x-ray beam through absorption & scatter as the beam passes through the patient   show
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show direct transmission  
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show indirect transmission  
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the optimal image is formed when only _____ _____ photons reach the IR   show
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show primary photons  
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photons that emerge from the tissue and strike the radiographic IR   show
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show attenuation  
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show small angle scatter  
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show the same as the incident photon  
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undesirable, additional density. Result of scatter   show
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energy range most likely to produce coherent scattering   show
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what happens to x-ray photons that are coherently scattered   show
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what energy range is most likely to yield photoelectric absorption   show
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show K or L shell electrons  
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what kind of interaction is most likely to occur between 60-90 kVp   show
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show a photoelectron  
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what are the byproducts of coherent scattering?   show
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show Compton scatter  
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What kind of interaction is likely to occur between 1.022 MeV - 50 MeV   show
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show Photodisintegration  
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show coherent scatter, compton scatter, photoelectric absorption, pair production, photodisintegration  
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show compton scatter & photoelectric absorption  
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What are the other names for Coherent scattering   show
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relatively simple process that results in no loss of energy as x-rays scatter   show
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Coherent scattering takes place at mostly what energy level?   show
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show incoherent, inelastic, modified scattering  
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show compton scattering  
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interaction when an outer shell electron is ejected from its shell   show
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show 35 keV  
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show photoelectric absorption  
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type of interaction where incident photon surrenders all its energy to orbital electron & ceases to exist   show
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show photoelectron  
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show increases / does  
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show characteristic photon or characteristic x-ray (fluorescent radiation)  
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show Auger effect  
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Auger effect is said to be a radiationless effect why?   show
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show fluorescent yeild  
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Auger effect more likely in materials with higher or lower Z#   show
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show lower  
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byproducts of photoelectric absorption   show
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show Increases markedly as energy of incident photon increases, and Z# decreases  
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show effective atomic number  
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show influences attenuation. Density increase leads to corresponding increase in photon absorption. Z# & density play role in attenuation  
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body part thickness factor   show
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show greater  
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greater amt of photoelectric absorption, the ___ the contrast in an image between adjacent structures for different Z#   show
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show they increase  
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show to distinguish between structures with similar atomic numbers or mass densities  
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what are common positive contrast agents and why?   show
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Administration of contrast media can lead to _____ patient dose   show
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show Pair Production  
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show increased  
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what happens in pair production   show
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probability of pair production interactions become significant at what energy level?   show
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show positron decay  
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show positron  
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unstable nuclei used in PET imaging   show
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interaction that occurs above 10MeV in high energy radiation therapy treatment   show
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high energy photon collides with nucleus, which absorbs all the photons energy & nucleus emits neutron, proton, deutron, or alpha particle   show
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Created by: jen.studer
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