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Level and window

Level and window (see image processing algorithms) can be set with Level/Window sliders and spin boxes or using histogram window.

Usually applicable to DICOM CT images:

Substance Housefield Units (HU)
Air −1000
Lung −500
Fat −100 to −50
Water 0
CSF 15
Kidney 30
Blood +30 to +45
Muscle +10 to +40
Grey matter +37 to +45
White matter +20 to +30
Liver +40 to +60
Soft Tissue, Contrast +100 to +300
Bone +700 (cancellous) to +3000 (dense)

Examine an image by changing window in small steps, specially inside soft tissue range.