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radio contrast

caseys summer class

QuestionAnswer
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
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
Created by: hseratt
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