Question | Answer |
1. Define Radiographic Contrast. | The difference between adjacent densities within the radiographic image |
2. What is the primary controlling factor for contrast | kVp |
3. What are the two types of contrast seen in medical radiography | Long scale (low contrast) and short scale (high contrast |
4. Describe long scale contrast | Many shade of gray; also referred to as low contrast |
5. Describe short-scale contrast. | Few shades of gray; mainly black and white image (also called high contrast) |
6. Which of the two types of contrast exhibit a wide exposure latitude | Long scale contrast |
7. Which of the two types of contrast is a product of low kVp | Short scale contrast (high contrast) |
8. What factors compose radiographic contrast | Image receptor (film) contrast and subject contrast |
9. What influences image receptor (film) contrast | |
10. Characteristics of the film and processing what determines subject contrast | Size, shape, and attenuating characteristics of the material being irradiated |
11. Which of the two contrast factors should be standardized | Image receptor (film) contrast |
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 |
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) |
15. How does mAs affect contrast | mAs alters density of image and therefore affects contrast |