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Interpolation and Overlays

The control buttons in the lowest row define image interpolation and the degree of overlay information are

Activates a temporary 9-point smoothing filter for display purposes.

Enables/disables smooth image interpolation. Interpolation is needed because in most situations the resolution of the display viewport differs from the original image matrix. If this button is not active, the original rectangular pixels are shown.

Defines the image interpolation method (Trilinear, B-Spline, Mitchell = Default).


Displays a 20mm grid centered at the origin of the data set. Bold lines indicate the location of the image origin.

Displays patient/study information such as patient name, id, study date, etc as an image overlay.

Displays anatomical information. The annotations are the same as used in DICOM:
H - head, F - feet, A - anterior, P - posterior, R - right, L - left
For oblique orientations the letters are combined whereby the first letter indicates the direction closest to the current row/column direction.

Displays VOIs which have been defined for the current study.

A toggle to switch on/off all overlay information at once.

Note: the smoothing/interpolation functions serve only for image display enhancement. Statistical analyses are always performed with the original pixel values.