CT window and level presets: a printable cheat sheet.

Window width is the range of Hounsfield units (HU) shown as grey levels. Window level, also called the centre, is the HU at the middle of that range. The table below lists the presets built into NoustaView.

NoustaView built-in CT presets

Values vary between institutions and vendors; Radiopaedia's Windowing (CT) article lists common ranges.

Values reviewed by Dr. KW Chan, 14 October 2026.

How to apply a preset in NoustaView

The window presets give you a standard starting point, and the Shortcuts panel lists the key for each preset. The presets are on the keys 1 to 7 by default, and every shortcut can be rebound. From there, right-drag adjusts contrast.

Reading the numbers

A narrower width gives more contrast between similar densities, because fewer HU are spread across the same range of grey. A wider width gives lower contrast: it compresses that range, so high- and low-density structures can share one image. A lower level shifts the window towards lower-density tissue, which then shows in mid-grey.

Print this page

Use your browser's print command. The header, footer, call to action and Related list are hidden in the printed copy.