chapter 7
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| image formation | show 🗑
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| show | exit radiation
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| show | consists of transmitted and scatter x-ray photons. Forms the diagnostic image on the image receptor.
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| transmitted x-rays | show 🗑
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| image receptor | show 🗑
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| relationship between beam attenuation and x-ray photon energy | show 🗑
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| show | increased part = increased attenuation
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| show | increase density = increased attenuation
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| show | increased atomic # = increased attenuation
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| show | The amount of material required to reduce the amount of x-ray beam intensity to one-half its original value. affected by kvp and filtration.
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| filtration | show 🗑
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| show | The removal of x-ray photons from the beam due to absorption or scattering
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| why does beam attenuation occur? | show 🗑
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| show | 1.absorption
2.scatter
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| show | 1.Photoelectric effect
2.comptoon scattering
3.coherent/classical scattering
4.pair production
5.photodisintegration
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| show | complete absorption of the x-ray by knocking out the inner shell e- producing a photoelectron. The photoelectron leaves the atom. an electron from another shell drops down to fill the void and generates a secondary electron photon.
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| show | generally becomes scatter in the body and are absorbed which contributes to patient dose
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| show | occurs when the outer shell e- is ejected by x-ray photon (creates a secondary/secondary e-). The now lower energy photon changes direction and interacts with the image receptor.
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| what interaction is it when some x-ray photons interact with tissue but aren't absorbed and loses energy? | show 🗑
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| show | Probability depends on both the energy of beam and the composition of the anatomy.The energy of the beam must be greater than or equal to the binding force if the inner shell e-.Atoms with higher atomic #'s absorb more x-rays
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| what is the probability of Compton effect happening depend on? | show 🗑
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| show | occurs between very low energy x-ray photons and matter
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| What energy level must it be for a coherent/classical interaction to occur? | show 🗑
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| Does coherent/classical scatter cause ionization of the atom? | show 🗑
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| show | the incident photon interacts with electrons in an atom and causing the electrons to become excited and vibrate. The excited atom releases the excess energy as a scatter x-ray photon wit the same wavelength as the incident photon.
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| Is coherent/classical scatter diagnostic in radiology? | show 🗑
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| show | 1.Thomson
2.Rayleigh
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| show | Thomson involves a single e- of the atom and Rayleigh involves all of the electrons in the atom.
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| what happens when scatter reaches film? | show 🗑
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| show | increases it
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| What happens if scatter leaves the patient and doesn't strike the image receptor? | show 🗑
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| define- differential absorption | show 🗑
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| what are the 4 factors that image formation is the direct result of? | show 🗑
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| What is pair production used for? | show 🗑
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| what is the process of pair production? | show 🗑
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| what makes pair production an annihilation reaction? | show 🗑
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| What is photo disintegration used for? | show 🗑
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| In photo disintegration what does the x-ray interact with? | show 🗑
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| In photo disintegration how much photon energy is required? | show 🗑
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| What is the process of photo disintegration? | show 🗑
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| define- ionization | show 🗑
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| show | 1.gamma radiation
2.x-ray radiation
3.ultra violet radiation
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