FieldTrip

Note that this reference documentation is identical to the help that is displayed in Matlab when you type “help ft_datatype_volume”.

  FT_DATATYPE_VOLUME describes the FieldTrip MATLAB structure for volumetric data.
 
  The volume data structure represents data on a regular volumetric
  3-D grid, like an anatomical MRI, a functional MRI, etc. It can
  also represent a source reconstructed estimate of the activity
  measured with MEG. In this case the source reconstruction is estimated
  or interpolated on the regular 3-D dipole grid (like a box).
 
  An example volume structure is
            dim: [181 217 181]         the dimensionality of the 3D volume
      transform: [4x4 double]          affine transformation matrix for mapping the voxel coordinates to the head coordinate system
        anatomy: [181x217x181 double]  the numeric data, in this case anatomical information
 
  Required fields:
    - transform, dim
 
  Optional fields:
    - anatomy, prob, stat, grey, white, csf, or any other field with
      dimensions that are consistent with dim
 
  Deprecated fields:
    - dimord
 
  Obsoleted fields:
    - none
 
  Revision history:
 
  (2011) The dimord field was deprecated and we agreed that volume
  data should be 3-dimensional and not N-dimensional with arbitary
  dimensions. In case time-frequency recolved data has to be represented
  on a 3-d grid, the source representation should be used.
 
  (2010) The dimord field was added by some functions, but not by all
 
  (2003) The initial version was defined
 
  See also FT_DATATYPE, FT_DATATYPE_COMP, FT_DATATYPE_DIP, FT_DATATYPE_FREQ,
  FT_DATATYPE_MVAR, FT_DATATYPE_RAW, FT_DATATYPE_SOURCE, FT_DATATYPE_SPIKE,
  FT_DATATYPE_TIMELOCK, FT_DATATYPE_VOLUME