Module: Volume Fraction ()

Description:

For an introduction, see section Analysis.

This module computes the volume fraction of a binary or label image, using or not a mask. It outputs a spreadsheet with one row per label (non zero) or label per slice, and the following columns:

• Volume Fraction: the proportion of the image occupied by the objects.

  In the 2D case :
  

  
  

  In the 3D case :
  

  
  
• Label Volume: volume of (masked) label - in all 3D image or current slice depending on interpretation port, based on voxels size and current units.

  In the continuous case, the volume is defined as:

  
  

  
  

  In the discrete case, Volume is approximated by the sum of the voxel intensities in X:

  
  

  
  

  where = 1 if the voxel of coordinates is on the object.

• Total Volume: (if no mask) total volume of the image or slice, depending on interpretation, based on voxels size and current units.

  In the 2D case :
  

  
  

  In the 3D case :
  

  
  
• Mask Volume: (if mask) volume of mask - in all 3D image or current slice only depending on interpretation port, based on voxels size and current units.
• Label Voxel Count: volume of masked label in voxels number. See Label Volume description.
• Total Voxel Count: (if no mask) total volume of the image in voxels number. See Total Volume description.
• Mask Voxel Count: (if mask) volume of mask in voxels number. See Mask Volume description.
• Slice Index: index of the considered slice in 2D mode.
• Label id: Index of the considered label.

See also: Area, Euler Number, Average Object Area Per Slice, Object Boundary Area, Total Image Boundary Area, Average Object Number Per Slice, Object Specific Surface, Object Surface Density.

Connections:

Input Image [required]
The image to analyse. Supported types include: binary (Uniform Label Field with 2 labels) and label (Uniform Label Field) images.

Input Image Mask [optional]
The masking image. Supported types include: binary images (Uniform Label Field).

Ports:

Interpretation

This port specifies whether the input will be interpreted as a 3D volume or a stack of 2D images for processing.

• "3D": the module configuration is set to 3D. The image will be processed as a whole in 3D. Some measures are only available in this mode.
• "XY planes": the module configuration is set to 2D. The image will be processed slice per slice.