RAD - IMAGING STUDY QUESTIONS

which of the following will affect radiographic contrast
grid devices
small focal spot
beam restrictors

which of the following have an effect on recorded detail
focal spot size
kvp
source to image distance

intensyfying screens with a speed at 200 will:
require 50% less exposure than 100 speed screens
increase the production of scatter radiation
enable the radiographer to decrease the exposure time

which of the following is not a charactteristic of an intensyfiying screen:
high atomic number
high conversion efficiency
high phosphorescence
appropriate spectral matching

an increase in radiographic density will most likely result from:
kvp
mas
 grid ratio
fss

when IS screens continues to glow after the xray exposure has ended the screen is said to posses:
fluorescence
incandescence
luminescence
phosphorescence

radiographic sharpness(detail) is directly proportional to:
SID
screen speed
FSS

quantum mottle is most obvious when using:
slow speed screens
rare earth screens
fine grain film
minimal filtration

which of the following is NOT related to radiographic contrast
OID
grid
photon energy
FSS

umbra (geometric sharpness) is greatest where

direct exposure (non screen) radiography is rarely employed today because it:
produces excessive contrast
produces excessive density
produces insufficient detail
requires excessive pt dose

which of the following will cause an increase in subject contrast
increase of mas
increase grid ratio
decreasing kvp

which of the following contribute to quantum mottle
high speed film/screen combinations
high mAs, low kvp factors
low mas, high kv factors

which of the following will decrease recorded detail
increase fss
decrease in screen speed
an increase in SID
a decrease in OFD

which of the following is not classified as a rare earth phosphor
lathanum oxybromide
gadolinium oxysulfide
calcium tungstate
yttrium

the form of spectral matching refers to the fact that film sensitivity must be matched with the:
proper color screen fluorescence
correct kvp
correct ma level
proper developer concentration

with a given exposure as intensifying screen speed increases how is radiographic density affected:
density decreases
density increases
density remains unchanged
density is variable

what terms describes a picture element the smallest area represented in a digital image
pixel
coxel
matrix
modulation transfer function

when involuntary motion must be considered the exposure time may be cut in half if the kvp is
doubled
increased 15%
increased 25%
increased 35%

if the developer temperature in the automatic process is higher than normal what will be the effect on the finished radiograph:
decreased contrast
increased density
increased contrast

which of the following will increase contrast
increase collimation
increase grid ratio
increase SID

which of the following would increase the number of photons striking the IR
increase SID
increase OID
increase kvp
increase beam restriction

recorded detail is improved when an object is imaged by more perpendicular rays rather than divergent rays. this may be accomplished by
increase SID
incresing OID
decreasing SID
using an angle on tube

which of the following has an effect on radiographic density
collimation
kv selection
SID

all of the following will have an effect on recorded detail except:
FSS
SID
grid ratio
motion

which of the following are affected by film/screen combination
density
film contrast
recorded detail

the relative speed of the intensifying screen and the mAs needed to provide adequate density have which type of relationship:
inversely proportional
directly propoprtional
relative speed squared equals the mAs
non of the above

the layer of the IS closest to the film is
protective coat
base
relfective layer
emulsion layer

the reflective layer in the IS can be made of:
titanium dioxide
zinc sulfide
calcium tungstate
polyester

fluctuations in brightness that are unrelated to the object being imaged can be collectively described as:
image nose
matrxi size
picture elements
exposure latitude

which of the following would be the least likely cause of poor form film/screen contact
a foreign object in the cassette
dirt or dust in the IS
a warped casette
damage to the foam pressure pad the screen is mounted on

how much is the latent image is formed by light photons
99
75
15
32

how does the presence of a reflective layer affect patient dose
decreases amt of light hitting the film decreasing pt dose
requries increase in tech factors increasing pt dose
it increase the amt of light hitting the film therefore decreasing pt dose

the emission spectra for gadolinium oxysulfide is
green
blue
red
purple

which of the is not considered a way to measure film.screen resolution
lines per millimeter
lines spread function
pin hole camera
modulation transfer function

the normal life span of an IS is
10 yrs
5-7
1-2

window width in CR and DR controls what image property
density
contrast
recorded detail
algorithm

what would be the result of mismatching screen emission spectra
film would have excessive density
film would have inadequate density
film would be fogged
film would not be affect4ed

which of the following changes would not produce an increase in radiographic density?
10mas -13 mas
200 ma -100ma
.2sec to .7
50kv to 65kv

which of the following would not produce an increase in radiographic contrast
90-70kv
100 f/s speed to 400 f/s speed
heavy patient to thin patient
10:1 grid to 5:1 grid

which of the following will occur if exposure time is increased
ma increases
density increases
motion may increase

if the distance between the xray tube and the IR is doubled, the mAs required to maintain IR exposure or radiographic density for a repeat image is
doubled
halfed
quadrupled
reduced by 4

the relationship between time and density.IR exposure is
direct
inverse
directly proportional to the square of the distance
inversely proportional to the square of the distance

an increase in filtration would ___ contrast
increase
decrease
not affect

a decrease in replenishment rate would ___ film density
increase
decrease
not affect

a significant increase in ofd would ___ contrast
increase
decrease
not affect

an increase in flm/screen speed would ___ recorded detail

a decrease in ma would ___ density/IR exposure
increase
decrease
not affect