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