Bushong Ch 10
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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| show | 1) by coherent scattering, 2) through the Compton effect, 3) through the photoelectric effect, 4) by pair production, and 5) by photodisintegration.
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| What effects are important in making an x-ray image? | show 🗑
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| Eletromagnetic radiation interacts with structures that are similar in size to? | show 🗑
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| show | True
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| show | shorter
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| show | electrons; nuclei.
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| show | Classical scattering or Thompsons scattering.
Low energy x-rays (below 10 keV) and atoms
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| In Coherent Scattering the incident x-ray interacts with a target atom causing it to become? | show 🗑
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| show | True. Because the atom is just excited instead of ionized the incident x-ray and the scattered x-ray have the same wavelength and energy.
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| show | A slightly different direction.
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| show | energy
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| show | ionization.
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| Most coherent scattered x-rays are scattered in what direction? | show 🗑
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| show | Diagnostic radiology
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| show | The compton effect or compton scattering.
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| show | ionization
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| (Compton Effect) The ejected electron is called? | show 🗑
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| show | different; less
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| show | True
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| show | Its binding energy plus the kinetic energy with which it leaves the atom.
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| The mathematical formula for the Compton Effect is? | show 🗑
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| During a Compton interaction, most of the energy is divided between? | show 🗑
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| show | True
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| show | none
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| show | The compton electron
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| (Compton Effect) Even at 180 degrees of deflection, the scattered x-ray retains at least approximately how much of it's original energy? | show 🗑
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| (Compton Effect) x-rays scattered back in the direction of the incident x-ray beam is called? | show 🗑
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| show | Increases
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| The probability of the Compton effect is inversely proportional to x-ray energy (1/E) and independent of? | show 🗑
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| Compton scattering reduces? | show 🗑
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| Compton scattering in tissue can occur with all x-rays and therefore is of considerable importance in? | show 🗑
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| show | No useful information
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| show | True
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| (Photoelectric Effect) The electon removed from the atom is called? | show 🗑
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| show | The x-ray is totally absorbed.
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| (Photoelectric Effect) Photoelectric interaction produces what type of x-ray? | show 🗑
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| show | A vacancy in the K shell
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| A photoelectric interaction CANNOT occur unless the incident x-ray has energy how much energy? | show 🗑
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| show | False. It is directly proportionalx-ray to the third power of the x-ray energy and inversely proportional to the third power of the absorbing material.
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| True or False: The probability of the photoelectric effect is inversely proportional to the third power of the x-ray energy. | show 🗑
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| show | False. It does NOT occur during x-ray imaging.
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| If an incident x-ray has sufficient energy, it may escape interaction with electrons and come close enough to the nucleus of the atom to be influenced by the? | show 🗑
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| The interaction between the x-ray and the nuclear field causes the x-ray to???? and in it's place, ???? electrons appear, one ??? charged (positron) and one ????? charged. This is called | show 🗑
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| Pair production occurs with x-rays that have energies greater than? | show 🗑
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| (Pair Production) The x-ray interacts with? | show 🗑
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| (Pair Production) How many electrons that have opposite electrostatic charges are created. | show 🗑
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| (Pair Production) The energy equivalence of the mass of an electron has been calculated to be | show 🗑
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| show | 1.02 MeV
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| (Photodisintegration) X-rays with energy above approximately 10 MeV can escape interaction with electrons and the nuclear force field and will be absorbed by what? | show 🗑
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| (Photodisintegration) When the high energy x-ray is completely absorbed by the nucleus, the nucleus is raised to an excited state and instantly emits a nucleon or other nuclear fragment. This process is called what? | show 🗑
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| True or False: Photodisintegration does NOT occur in diagnostic radiology. | show 🗑
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| show | high energy; nucleus
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| show | True
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| show | True
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| (Differential absorption) occurs because of Compton scattering, photoelectric effect and x-rays transmitted through the patient. | show 🗑
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| show | Two, Compton effect and photoelectric effect.
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| (Differential Absorption) Compton scatter results in image noise. True of False? | show 🗑
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| (Differential absorption) increases as kVp is increased or reduced? | show 🗑
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| show | 1%
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| show | Differential absorption
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| show | True
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| show | the absorbed x-rays produce the white images on the radiograph, such as bones.
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| (differential Absorption) At low energies, most x-ray interactions with tissue are photoelectric. At high energies, Compton scattering predominates. True of False. | show 🗑
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| (Differential Absorbtion) The interaction of x-rays with tissue has what type of relationship to the mass density of the tissue regardless of the type of interaction? | show 🗑
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| show | Barium and iodine compounds.
Contrast agents.
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| Air is still used for contrast in some examinations of the colon along with barium; this is called? (Contrast Examinations) When used in this fashion, air is what type of contrast agent? | show 🗑
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| (Exponential Attenuation) When x-rays are incident on any type of tissue, they can interact with the atoms of that tissue through any of these five mechanisms. | show 🗑
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| (Exponential Attenuation) The relative frequency of interaction through each of the five interactions with matter depends on what? | show 🗑
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| (Exponential Attenuation) An interaction such as the photoelectric effect is called an absorption process because the x-ray disappears. ABSORPTION is an all-or-none condition for x-ray interaction. | show 🗑
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| show | Attenuation
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| (Exponential Attenuation) Attenuation is the product of? | show 🗑
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| (Exponential Attenuation) X-rays are attenuated exponentially which means what? | show 🗑
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| show | True.
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| show |
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Created by:
Baker RAD 2012
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