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Radiography Johnston Ch.7 and Sherer Ch.3 Exam
Terms in this set (47)
which interaction is the major source of occupational exposure?
contrast media is used to increase what type of interaction?
which interaction is the primary contributor to image fog?
which of the following is the result of excitation of an orbital electron without removing it from its shell?
which of the following is not a type of interaction between x-radiation and biologic matter?
which of the following terms refers to the radiation that occurs when an electron drops down from an outer orbit to fill a vacancy in an inner orbit of the parent atom?
which of the following interactions results in the conversion of matter into energy?
the x-ray photon energy required to initiate pair production is:
differences in density level between radiographic images of adjacent structures as seen in a completed radiograph define:
particles associated with electromagnetic radiation that have no mass or electric charge are:
__________ controls quality, or penetrating power, of the photons in the x-ray beam, and to some degree also affects the quantity or number of photons in the beam.
_________ controls the quantity of radiation that is directed toward a patient during a selected x-ray exposure.
what is the term for when x-rays interact with human tissue electromagnetic energy is transferred from the x-rays to the atoms of the patient's biologic material
what is the target anode made up of?
what are 2 reasons tungsten is used as a target material?
high melting point, high atomic number
formed ONLY when direct transmission x-ray photons reach the image receptor
optimal x-ray image
what is the inherent filtration
what is the added filtration
what is the total filtration
the x-ray photon beam that emerges from the x-ray tube and is directed toward the image receptor
in diagnostic radiology the energy of the electrons is expressed in ___________
volts or kilovolts
when an x-ray beam passes through a patient, it goes through a process called __________
when obtaining a radiographic image, because many billions of small-angle scatter events occur, a greater overall exposure of the IR occurs, producing ___________
where is the importance of coherent scattering between x-radiation and matter
not important in any energy range
where is the importance of photoelectric absorption between x-radiation and matter
where is the importance of compton scattering between x-radiation and matter
diagnostic radiology and therapeutic radiology
where is the importance of pair production between x-radiation and matter
where is the importance of photodisinegration between x-radiation and matter
mass density of different body structures influences _________
what is the diagnostic radiology energy range:
23 to 150 kVp
a relatively simple process that results in no loss of energy as x-rays scatter
occurs with low-energy photons
the less a given structure attenuates radiation, the ________ will be its radiographic density on a radiographic film
the more a given structure attenuates radiation, the ________ will be its radiographic density on a radiographic film
sets the midpoint of the range of densities visible on the image
is a monitor function that can change the lightness or darkness of the image on a display monitor
if tissues or structures that are similar in atomic number composition, and mass density must be distinguished, use of appropriate ________ ________ may be needed to ensure visualization of those kisses or structures in the radiographic image
positive contrast media:
negative contrast media:
list the 5 types of x-ray interactions:
classical scattering, compton scattering, photoelectric effect, pair production, photo disintegration
occur throughout the diagnostic range (20 to 120 kVp) and involve inner-shell orbital electrons of tissue atoms
occurs only with very high-energy photons of 1.02 meV or greater; creates a positron and electron
occurs when photons with extremely high energies of more than 10 meV strike the nucleus of the atom and make it unstable
the difference between the x-ray photons that are absorbed photoelectrically versus those that penetrate the body
refers to those x-ry photons that are transmitted through the body and reach the image receptor
has higher mass and higher atomic number making it absorb the beam
refers to those photons that are attenuated by the body and do not reach the image receptor
absorption equates ______ ______
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