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With this window and level, how will structures less than 25 HU look?

With this window and level, how will structures less than 25 HU look?

With this window and level, how will structures less than 25 HU look?

Completely black

If a CT image is viewed with a window width of 100 HU and a level of 75 HU, what are the upper values of the window (in HU)

With this window and level W 100, L 75, how will structures more than 125 HU look?