Stack #735079
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 | the number of electrons boiled off of the filament
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| what imaging system has a linear exposure relationship? | show 🗑
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| show | overexposed
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| ___ represents the different absorbtion characteristics of the body | show 🗑
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| with film/screen systems image density is represented by twhat? | show 🗑
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| What happens to density as processing developer temp. increases? | show 🗑
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| show | it decreases
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| the intensity of a beam is less on which end of the tube? | show 🗑
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| show | it increases
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| As kVp increases and everything else remains constant what happens to density | show 🗑
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| what is the absorbing material in a grid? | show 🗑
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| show | increase by a factor of 4
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| total filtration in the x-ray tube head assembly affects density by___ | show 🗑
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| show | it will decrease
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| which set will produce the highest contrast? 50@20, 58@10, 67@5, 77@2.5 | show 🗑
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| the lower the kVp the _____ resultant of contrast | show 🗑
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| what tissue group will likely have the greatest xray absorption? | show 🗑
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| show | 0.5 because the lowest difference between densities will present low contrast
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| show | sensitivity speck
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| what layer in general film is not duplicated? | show 🗑
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| which layer is manufactures to reduce eye strain? | show 🗑
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| a grid will _____ scatter production... how/why? | show 🗑
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| show | decrease
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| a compensating filter will ________ contrast | show 🗑
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| show | decreases
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| collimation ____ contrast | show 🗑
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| show | the scale of contrast
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| show | greater the
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| the lower the kVp the ____ the contrast | show 🗑
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| show | all of them
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| show | mAs
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| show | mAs
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| show | kVp
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| show | 65 mAs
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| show | 6 new mAs=24*(1/4)
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| if the collimation field is made smaller what will happen to the density if the mAs is not adjusted? | show 🗑
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| purpose of a grid? | show 🗑
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| show | 80
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| show | mAs
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| show | increase mAs because the photons that would have exposed the patient or the image receptor are removed.
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| to obtain a higher scale of contrast you must _____ kVp and ____mAs | show 🗑
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| show | a factor of 2
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| ____ controls the overall blackness of a radiograph? | show 🗑
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| show | longer;shorter
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| films with thicker emulsions or larger silver halide crystals will have ______ sharpness | show 🗑
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| in digital, changing a negative image to a positive image is called what? | show 🗑
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| adjusting the brightness and contrast is called what? | show 🗑
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| show | latent image
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| which kVp is capeable of producing the lowest contrast? 50,60,70,80 | show 🗑
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| which kVp setting will provide the most kenetic energy to filament electrons? | show 🗑
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| show | 20 less energy more chance of the photons being absorbed in the body less hitting the IR
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| show | fat
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| which tissue group has the highest water content? | show 🗑
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| what is the primary absorber of xrays in bone? | show 🗑
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| in which layer of the intensifying screen is xray energy converted into light? | show 🗑
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| show | emu;sion
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| once the halide crystals are exposed the sensitivity speck will first aquire what charge? | show 🗑
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| why is scatter exposure undesirable? | show 🗑
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| compensating filters in effect _____ tissue thickness and density | show 🗑
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| which OID would result in the greatest increase in radiographic contrast? 1,4,6,12 | show 🗑
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| show | increase
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| show | step up transformer
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| if the lead strips are 4.0 mm high and are separatedby an interspace of 025mm what is the grid ratio? | show 🗑
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| if lead strips are 2.0mm high and are separated by an interspace of.25mm what is the grid ratio? | show 🗑
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| s radiograph is produced using 85@8 without a grid. a second film is requested using an 8:1 grid with a conversion factor of 4 what mAs is needed? | show 🗑
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| 1st radiograph is 85@10 without a grid what would be the mAs if using a 16:1 grid?(conversion factor of 6) | show 🗑
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| show | 30* 5/6= 180/5 = 36 mAs
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| show | 1,3,4,5,6
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| when the patient thickness is more that 10cm the kVp should be | show 🗑
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| transmission is responsible for what? | show 🗑
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| absorption is responsible for | show 🗑
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| show | thinner;higher
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| contrast is _____ when a grid is used | show 🗑
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| what will go down, what must be increased, when a grid is placed in beam? | show 🗑
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| show | all lead sstrips are parallel to eachother, they absorb a large amount of the primary beam resulting in some cut-off
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| with a decrease in SID grid cut-off will | show 🗑
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| show | horizontal lead strips, vertical lead strips, primary beam must be centered perp. to grid, grid must remain flat
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| focused grid | show 🗑
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| focused linear grids | show 🗑
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| show | convergence line, narrow positioning latitude, improper centering results in periphereal cut-off, only useful at present SID distance
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| show | higher frequency grids
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| what are the four main grid errors? | show 🗑
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| show | off level
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| when a focused grid has partial grid cut-off over t he entire image nad it looks underexposed what type of error is it? | show 🗑
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| show | off focus
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| if complete grid cutoff occurs except in the central region of the central ray what error is it? | show 🗑
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| show | focused
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| show | kVp, degree of clean-up, patient dose
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Created by:
b.xray