caseys summer class
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each of the black spaces below before clicking
on it to display the answer.
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| 1. Define Radiographic Contrast. | The difference between adjacent densities within the radiographic image
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| 2. What is the primary controlling factor for contrast | kVp
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| 3. What are the two types of contrast seen in medical radiography | Long scale (low contrast) and short scale (high contrast
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| 4. Describe long scale contrast | Many shade of gray; also referred to as low contrast
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| 5. Describe short-scale contrast. | Few shades of gray; mainly black and white image (also called high contrast)
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| 6. Which of the two types of contrast exhibit a wide exposure latitude | Long scale contrast
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| 7. Which of the two types of contrast is a product of low kVp | Short scale contrast (high contrast)
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| 8. What factors compose radiographic contrast | Image receptor (film) contrast and subject contrast
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| 9. What influences image receptor (film) contrast |
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| 10. Characteristics of the film and processing what determines subject contrast | Size, shape, and attenuating characteristics of the material being irradiated
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| 11. Which of the two contrast factors should be standardized | Image receptor (film) contrast
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| 12. What effect do grids have on contrast |
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| 13. How does increasing filtration affect contrast | Contrast is decreased slightly because filtration increases the average photon energy of the beam
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| 14. How does tighter collimation affect contrast | Tighter collimation reduces the number of photons available, thus reducing the amount of scatter and increasing contrast (shortens the scale of contrast)
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| 15. How does mAs affect contrast | mAs alters density of image and therefore affects contrast
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