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Rad Grids

QuestionAnswer
what would be the only advantage of a linear parallel grid over a linear focus grid? place grid at any SID
what is the advantage of a focus grid over a linear grid do not get grid cutoff, only in periphery
if you have a situation where you had no control over SID then what grid would you want to use? parallel grid
what is defined by the loss of density due to absorption of the image forming beam by the lead strips grid cutoff
if you have two grids, either linear focus or linear non focused perpedicular to each other would be ....? is there any positioning latitude then? Crossed Grid. No
what is grid focusing range or grid radius when we have a focus grid *
whats the purpose of a potter bucky moving grid? what are the two motions it moves? move out the grid line. oscillating and receptacle
does the grid start before or after exposure before, and has to continue until after
what is the definition of grid ratio the height of the grid divided by the interspace width. grid ratio= h/D h(height of grid) D(Interspace material) it can be aluminum(Best), plastic or carbon fiber
if we have a higher ratio grid which we would use anytime when thier is more scatter produced, what would happen to interspace? would the grid be more or less efficent? get smaller. More
what are the rules of thumb for using a grid greater 60 Kvp and more than 10cm in pathology
whats the formula for grid ratio h/D
what are some common grid ratio's we might use? 5:1, 2:1, 6:1, High ratio 16:1, 10:1, 12:1
what is defined when the number of lead strips per unit measure. how does that help determine the efficency of a grid? grid frequency. *
if we were doing film screen technology what would be the most efficent grid you could buy high ratio low freq
bucky factor amount of exposure patient recieves with a grid vs. without a grid.
contrast improvement factor looks at the contrast on image with a grid vs. a contrast on a image without a grid
what is the air-gap *
whats an alternative when using film screen technology backwards cassette
with electronic imaging, what causes the moire effect thick lead lines
what is the type of radio-opaque material used for grids lead
what are some types of radio lucicent material used for grid carbon fiber, plastic, aluminum
what two factors determine grid efficency grid ratio and frequency(amount of lead)
what is a disadvantage of using a grid increase patient dose
what is the main purpose of a grid clean up scatter
if we clean up scatter what happens to contrast Increases
when we use a grid why do we have to increase technique. because everything is being absorbed
what % of the useful density is from scatter on a chest? abdomen 50, 90
what is scatter weaken photons from patient that change direction
what technical factor controls amount of scatter produce kvp
what are some patient factors that control amount of scatter pathology,type of tissue,thickness
if you use a grid that is more efficent would we clean up more or less scatter more
what are two ways a manufacture can make a grid more efficent high grid ratios(thiner interspace), low frequency (thicker lead lines)
so if you have less of an interspace and thick lead lines, very effiecent grid. do you have a lot of positioning latitude no
if we clean up scatter properly what does that do to our image. how does it improve the image better contrast, improved visibility detail
what is contrast density difference, more black than white
if we increase the ratio of the grid to make it more efficent, what do we have to do to our techniques to compenstate for the loss of density increase technique(mAs, Kvp), patient does increase
which with electronic imaging system do the recomend today which better meets ALARA standards kvp
where is the highest % of scatter produced 180 degrees highest quanity , but 90 degrees gets the highest intesty
scatter is what % or what fraction of the xray photon 1/1000 or .1%
which two tissues in your body make the most scatter adipose, muscle(fluid filled)
do grids have anything to do with production of scatter No, But they will reduce after it is produced.
if we are doing a chest at the chest board what kvp do we use. if we have high kvp would we have more or less scatter produced, then would we want to use a what type of ratio grid 117 high. thicker than 10 cm, so use grid. more, higher
what do we use for abd work low kvp 70-80, so use intermediate speed grid(10:1, 12:1)
what grid ratio do we use on portable xrays 8:1
why is it better to do kvp than mas less patient dose
for mAs ratio 5:1, 6:1, 8:1, 12:1, 15:1 what do you multiply by (for non grid to grid) 5:1(2), 6:1(3), 8:1(4), 12:1(5), 15:1(6)
what is the definition of grid cutoff loss of density due to bad angle that causes image forming rays to be absorb by lead strips
of focus grid was upside down on chest xray where would you see the cutoff severe peripheral, where both lung shadows should be
where would you see cutoff if you have a grid that was off center more to one side than another
what is the purpose of using a focus grid vs. a parallel grid to prevent periphreal cutoff,
what happens if we dont use right SID periphreal
where would be the cutoff if the central ray is perpendicular to grid lines image would be light*
if we use a grid and dont change technique whats going to happen to density go down, so increase kvp or mas to maintain it, and the contrast improves
Created by: johnsoni1986