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physics hw 10-1,2,3
physics
Question | Answer |
---|---|
what is not one if the 5 basic xray interactions with matter | bremsstahlung |
which interaction contributes to image noise | compton scattering |
what occurs in a compton interaction | an atom is ionized |
during the compton effect, most of the incident xray energy is given to what | scattered xray |
after compton scattering, the scattered xray has | longer wavelength |
compton interaction affects the image by increasing what | noise (fog) |
the probability that an xray will interact with an outershell electron is influenced principally by what | the energy of the incident xray |
the compton effect is | independent of Z |
the compton effect is | the prinicple source of image noise (fog) |
the probability that an xray will undergo compton interaction | decreases with increasing xray energy |
the compton ineteraction involves so called "unbound" electrons because | they have a very low binding energy |
which xray interaction does not cause ionization | classical scattering |
comptom scattered xrays | have a lower energy that the incident xray |
the photaelectric affect is principally associated with | absorption of an xray |
what has the lowest effective atomic number | fat |
during photoelectric interaction | an electron is emitted from the atom |
the radiologic image is formed principally by | photoelectric interactions |
as a result of photoelectric interaction | an electron leaves the atom |
the photelectric effect is | the complete absorption of an xray with the subsequent emission of an electron |
the probability of photoelectric effect varies as what function of xray energy | E-3 |
the probabilty of photoelectric effect varied as what function of target atomic number | Z3 |
anatomic structures that readily transmit xrays | are called radiolucent |
differential absorption is basically the result of differences between | photoelectric effect and transmission |
when a radiograph is taken | low KVP is necessary when soft tissue is imaged because it leads to high photoelectric effect |
what has the greatest mass density | bone |
the colon is imaged during a barium enema exam principallyu because of differences in | subject atomic number |
air contrast studues such as a colon examination are successful principally for what reason | there are differences in effective atomic number adn there are differences in mass density |
to optimize xray mammography | the main xray interaction should be the photoelectric effect |
differential absorption between bone and soft tissue occurs principally for what reason | there is a difference in effective atomic number |
angiography with iodinated compounds | works principally because of differences in effective atomic number |
differential absorption is | the difference between those xrays that are absorbed and those that are transmitted |
as KVP increases the relative numebr of xrays | that interact with tissue decreases |
how is photoelectric interaction with tissue related to the mass density of the tissue | it is proportional |
lungs are images on a chest radiograph principally because in differences in what | tissue mass density |
differential absorption between lung and soft tissue occurs principally because of what | the difference in mass density |
the reduction in intensity of an xray beam after it passes through tissue is called what | attenuation |
xray tranmssion decreases exponentially which also means | the number of xrays is never reduced to zero |
which process contributes most to the radiologic image | photoelectric effect |
high KVP in chest radiography will | reduce patient dose |
increasing KVP in xray imaging will | reduce skin dose |
in high KVP chest radiography contrast depends most upon | mass density |
microcalcifications are imaged on mammograms because | of atomic number |
more contrast is present from a barium exam than from an iodine exam because | barium has a higher concentration |
photoelectric effect is proprtional to | Z3 |
what will increase the energy of brems radiation | xray tube voltage |
at 60 KEV in soft tissue, what predominates | compton scattering |