Image quality
7 important questions on Image quality
So what do you do when you want high contrast pictures?
So that there is difference between the different tissues.
What determines contrast of the picture? (2)
- photon energy (kV) (higher kV means everything will be penetrated; so less contrast)
- scattered radiation
What means a high or low attenuation coefficient?
High means => does not pass everything.
So a high kV will result in a low attenuation coefficient.
=> and also low contrast, because everything will be penetrated.
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Why do you want the patients as close to the detector as possible?
What is the difference between sharpness and contrast. What influences this?
- Sharp is hard edges => so less sharpness because of the effect of scattering electrons. Or because of large focal spots.
- Contrast is color => differences in attenuation coefficients
What happens when there are more photons per pixel?
When there is a lot of noise, when is this the most probematic?
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