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Density and Contrast
| Question | Answer |
|---|---|
| If you increase mAs then density will..... | increase |
| if you decrease mAs then density will.... | decrease |
| How are mAs and densityt related? inversely/directly | directly |
| What is the influencing factor of density? | kVp |
| What is the controlling factor of density? | mAs |
| If you increase your SID then denisty will decrese/increase? | decrease |
| If you increase OID then denisty will decrease/increase? | decrease |
| What does filtration alter? | intensity |
| if you decrease filtration then density will increase/decrease? | increase |
| Filtration and density have a ____ relationship. | inverse |
| Beam restriction will ______ scatter photons. | reduce |
| if you increase beam restriction the density will ______. | decrease |
| Increased part thickness will result in a _______ of density. | decrease |
| Additive pathology will increase/decrease density. | decrease |
| destructive pathology will increase/decrease density | increase |
| Grids and density have a _______ relationship. | inverse |
| A high grid ratio will do what to the density? | decrease |
| Film/screen speed has a _______ relationship with density. | direct |
| Film/screen speed and mAs have a _____ relationship to denisty. | direct |
| Definition of density _______________. | the degree of blackening on the film |
| Density is controlled by ____. | mAs |
| ____ controls the current through the xray tube. | mAs |
| What is governed by the 15% rule ? | kVp |
| optimal density is __-__? | 0.25-2.25 |
| grids absorb scatter radiation which affect ______. | density |
| change ___ by 30% in order to see a visible change in denisty. | mAs |
| when mAs is increased, SID decrease, kVp is increased, FSS is increased, grid ratio is decreased, beam restriction is dcreased......... density will _______. | increase |
| The difference between adjacnt densities is ________. | Contrast |
| The controlling factor of contrast is ___. | kVp |
| If you increase kVp then contrast will increase/decrease. | decrease |
| Few shades of gray, low kVp, short scale, narrow latitude will have a (high/low) contrast? | high |
| Many shades of gray, high kVp, long scale, wide latitude will have a (high/low) contrast. | low |
| If you increase mAs contrast will ____________. | Do nothing (no effect) |
| Does the anode heel effect affect contrast? | No |
| If you increase SID contrast will _______. | increase |
| Distance and Contrast are (directly/inversely) related? | directly |
| If you increase filtration contrast will _______. | decrease |
| If you increase beam restriction contrast will ______. | increase |
| Additive pathology will (increase/decrease) contrast. | decrease |
| Destructive pathology will (increase/decrease) contrast. | increase |
| A higher grid ratio will (increase/decrease) contrast. | increase |
| Will Film screen speed effect contrast? | no |
| Does film processing effect contrast? | Yes. |
| Increase temp time or rate of film processing the contrast will (increase/decrease) | decrease |
| Decreasing temp, time or rate during film processing will (increase/decrease) contrast. | increase |
| the difference between adjacent tissues or shades of gray | contrast |
| contrast is controlled by ___. | kVp |
| three forms of contrast are _____,______,______. | film, subject, developer |
| What would you use to to calculate the change in beam intensity? | inverse sqaure law |
| primary function of contrast is to ____ _____ _____. | make detail visible |
| what is produced by the photoelectric effect? | contrast |
| Short scale contrast is produced by _ _____ ___. | a lower kVp |
| High contrast has a (long/short) scale contrast. | short (few shades of gray) |
| Long scale contrast will have (low/high) contrast. | low |
| low contrast is produced at (high/low) kvp. | high |
| many shades of gray will have a (low/high) contrast. | low |
| Because grids reduce the amount of scatter contrast is (increased/decreased) | increased |
| Films with a (wide/narrow) latitude will have short scale contrast which means there are few shades of gray. | narrow |
Created by:
jwheeler29
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