Windowing

• Focuses our gray scale to the tissues of interest – this is the "window width"
• Highlights subtle differences in tissues
• All densities below the specified values are black
• All densities above the specified values are white

Soft Tissue Window

• It is now very easy to tell the difference between fat (dark grey) and soft tissue (light grey)
• Notice that air (outside of patient) and lungs look exactly the same because they are outside of our specified window of HU values

Lung Window

• On the previous image we were unable to see the large pneumothorax
• Can now easily differentiate lung tissue from air in pneumothorax

Bone Window

• Can see differences in bony cortex and medulla
• Easier to detect fractures

Brain WIndow

• Window can be set narrowly enough that we can distinguish the very small differences in white matter and grey matter
• White matter is slightly less dense than grey matter due to presence of lipid-containing myelin

BRAIN IMAGE NEEDS TO BE REPLACED WITH ONE FROM PACS