scatter and grids
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37 Terms
is penumbra worse with short or long SID
short
what is the slanting of lead in the grids called
canting
what kind of contrast does scatter reduce
subject c ontrast
how can you restore subject contrast
by using grid
what do you have to do to the technique when using a grid
raise
what is the cm of body part that grid should be used
13cm
what are some causes of scatter
high kvp, large field size, thick part
what kind of technique is best for ALARA
high kvp low mas
when hearing quality and potential difference what do you think of
kvp
geometrical quality affects what part of image
detail
scatter affects what part of image
visibility
what is air gap technique
increasing oid because scattter will diverge before hitting plate
with more OID what happens to receptor exposure
lowers
what kind of factor is blur
geometric
where is the affective focal spot
patient
what happens to penumbra when you increase SID
goes down
what happens to penumbra when you increase OID
goes up
what controls spatial resolution
focal spot size
when using the line focus principal, is the affective or actual focal spot smaller
affective
who invented grid
gustav bucky
what does a grid do
reduce scatter before hitting receptor
restores subject contrast in remnant beam
what grids are used for different SIDS
focus grids
who solved grid lines and how
hollis potter by moving them
how many lines of foil per inch can be in a grid
110
in a potter bucky grid, what motion does a recipricol motor have
back and forth
what motion does an oscilating motor have
circular
what is the grid ratio formula
height of strips/distance between
is a higher or lower ratio of height of strips to distance better
higher
what is a way to increase frequency of strips in grid
make strips thinner
what ratio of grid is used for chest
16:1
what ratio of grid is used for abdomen or 40 SID
12:1
what grid ratio is used for portables
6:1 or 8:1
what is grid frequency
number of lead lines per inch
what is contrast improvement factor formula
contrast with grid/
contrast without grid
what is the contrast improvement factor measured by
densitometer
what is the bucky factor
ratio of mAs required with a grid to mAs required without a grid in order to maintain remnant beam exposure
What is the Bucky factor formula
Mas1/mas2= BF1/BF2