Density on the Cards I score 55%.1st.x.
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| What is it called when you change distance while maintaining density? | New mAs Law.
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| What is Density? | The amount of light shined on one side of the film vs. amount of light shined through the film.
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| ma.time= | mAs
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| How much of a change in mAs is required to produce a visible change in film density? | 30%
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| What is TFD? | Total Film Distance. Same as FFD or SID.
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| What is OFD? | Object to Film Distance or air gap technique.
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| What is OID? | Object to Image Distance
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| Anything that increases scatter, increases what? | Density
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| What is the correct Developer temperature? | 95 degrees
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| To increase density, what do you do? What do you do to reduce density? | To increase, double the maS, To reduce, divide.
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| Anything you turn up on a machine, makes density do what? | Go up.
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| If an x-ray is too light, what do you do to change it? | Double the mAs.
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| Need more contrast? What do you do? | Go down with KVP, down with mAs.
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| What do you measure density with? | Densitometer.
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| What is the density scale? What makes the x-ray black? | .25 to 2.5 Angstroms. 2.5 is black. .25 is the lightest you can go as there is a blue tint.
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| What is the controlling factor for changing film density? | mAs
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| How should exposure time be changed when going from a slow screen to a medium screen? | Decrease the time.
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| Increasing the kVp will have what effect on density? | Density goes up.
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| Which technique would yield the greatest film density? | High mAs, shorter distance (i.e, 200 mAs, 36")
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| What is the result of an image if the FFD is increased without making the proper technique adjustment? | Decreased density.
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| What is the relationship between mAs and film density? | Direct
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| The added density on a film due to high development temperatures is referred to as: | Chemical fog
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| If you double the FFD, what happens to the beam intensity? | Decrease by 4
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| If FFD is doubled, what is the correct technique adjustment to maintain the same film density? | Increase by 4.
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| Film density needs to be increased; if the mA remains the same, what other technique factors can be adjusted to accomplish this? | Time and kVp
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| How can you maintain film density if a grid is introduced into the exam? | Increase the mAs
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| What structure in the body is considered radiopaque? | Bone
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| Beam restrictors have what kind of affect on beam quality? | Reduce
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| Decreasing the mA from 300 to 100 mA will do what to density? | Decrease
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| Changing exposure time from .6 sec to .08 will do what to density? | Decrease
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| Changing from a high speed screen to a medium speed screen will do what to density? | Decrease
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| Decreasing development temperature will do what to density? | Decrease
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| Increasing kVp from 60 to 100 kVp will do what to density? | Increase
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| Changing from non-grid to 8:1 grid will do what to density? | Decrease
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| Changing from a small to a large focal spot will do what to density? | Nothing....not affected.
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| Increasing FFD from 40" to 72" will do what to density? | Decrease
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| What effect does any OFD have on film density? | Decrease
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| Casting a part can make it almost twice as thick; how would this affect film density? | Decrease. Fiberglass, go up 30% wet or dry. Plaster: Dry: mAs x2, wet: mAs x4
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