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Windowing (CT)

Dr Henry Knipe ◉ ◈ and Andrew Murphy ◉ et al.

Windowing, also known as grey-level mapping, contrast stretching, histogram modification or contrast enhancement is the process in which the CT image greyscale component of an image is manipulated via the CT numbers; doing this will change the appearance of the picture to highlight particular structures. The brightness of the image is, adjusted via the window level. The contrast is adjusted via the window width.

On this page:

Article:

Window width
Upper and lower grey level calculation
Typical window width and level values
Related articles
References

Images:

Cases and figures

Window width

The window width (WW) as the name suggests is the measure of the range of CT numbers that an image contains.

A wider window width (2000 HU), therefore, will display a wider range of CT numbers. Consequently, the transition of dark to light structures will occur over a larger transition area to that of a narrow window width (<1000 HU).

Accordingly, it is important to note, that a significantly wide window displaying all the CT numbers will result in different attenuations between soft tissues to become obscured ¹.

Wide window

Defined as 400-2000 HU best used in areas of acute differing attenuation values, a good example is lungs or cortical tissue, where air and vessels will sit side by side.

Narrow window

Defined as 50-350 HU are excellent when examining areas of similar attenuation, for example, soft tissue.

Window level/center

The window level (WL), often also referred to as window center, is the midpoint of the range of the CT numbers displayed.

When the window level is decreased the CT image will be brighter and vice versa.

Upper and lower grey level calculation

When presented with a WW and WL one can calculate the upper and lower grey levels i.e. values over x will be white and values below y will be black.

the upper grey level (x) is calculated via WL + (WW ÷ 2)
the lower grey level (y) is calculated via WL - (WW ÷ 2)

For example, a brain is W:80 L:40, therefore, all values above +80 will be white and all values below 0 are black.

Typical window width and level values

Although this varies somewhat from institution to institution and vendor to vendor, window width and centers are generally fairly similar. The values below are written as width and level (W:x L:y) in Hounsfield units (HU).

head and neck
- brain W:80 L:40
- subdural W:130-300 L:50-100
- stroke W:8 L:32 or W:40 L:40 ³
- temporal bones W:2800 L:600
- soft tissues: W:350–400 L:20–60 ⁴
chest
- lungs W:1500 L:-600
- mediastinum W:350 L:50
abdomen
- soft tissues W:400 L:50
- liver W:150 L:30
spine
- soft tissues W:250 L:50
- bone W:1800 L:400

Quiz questions

References

Physics and imaging technology: CT

computed tomography (CT)
- CT technology
- dual energy CT
  - clinical applications of dual energy CT
    - virtual non-contrast imaging
    - abdominal
    - vascular
    - urinary system
    - musculoskeletal
- CT image reconstruction
- CT image quality
- CT dose
- CT contrast medium
  - iodinated contrast media
- coronary CT angiography
- CT artifacts
  - patient-based artifacts
    - motion artifact
    - transient interruption of contrast
  - physics-based artifacts
  - hardware-based artifacts
    - ring artifact
    - tube arcing
    - out of field artifact
    - air bubble artifact
    - helical and multichannel artifacts
- CT safety
- history of CT
  - Godfrey N Hounsfield

Article information

rID: 52108

Section: Radiography

Tag: snippet title, cases, cases

Synonyms or Alternate Spellings:

Graylevel mapping
Gray-level mapping
Grey-level mapping
Contrast stretching
Histogram modification
Greylevel mapping

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Cases and figures

Figure 1: CT window and algorithm effectsFigure 1: CT window and algorithm effects

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Figure 2: CT windowing - the importanceFigure 2: CT windowing - the importance

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