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What mainly controls OD?
What mainly controls Contrast?
T/F Optic Density (OD) is controlled by kVp?
F, controlled by MAs
Diff b/t light & dark exposure?
- Light = underexposed
- Dark = overexposed
What % of MA change is necessary to change density?
at least 30%
What to do with MAs if film is underexposed?
What to do with MAs if film is overexposed?
half the MAs
What happens to MAs with a 15% increase or decrease in kVp?
- 15% increase = doubling MAs
- 15% decrease = halfing MAs
kVp to OD relation
As kVp increases so does OD (And vice-a-versa)
What happens to OD and contrast with a 15% increase in kVp and halfing the MAs?
- OD = same
- Contrast = decrease
Desired SID (source-image-distance)
What happens to image when tube ray is angled?
What do you do with a dark film with no contrast?
decrease kVp (increases contrast)
What do you do if the structures appear but they are too dark or light?
What do you do if the film is light and no structures are seen?
Which has more density, light or dark?
MA change w/ obesity, edema, Osteoporosis, 6-12 yrs., infants?
- Obesity = 50% increase
- Edema = 30% increase
- Osteo = decrease 30-50%
- 6-12 yrs. = reduce 30-50%
- infants-6 yrs = 75% decrease
What would you like to do?
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