NAME
  read CT slice - read a Computed Tomography (CT) data slice

AUTHOR
  Greg Johnson
  San Diego Supercomputer Center

SUMMARY
  Name          read CT slice

  Type          Input

  Inputs        none

  Outputs       field 2D 2-space scalar uniform

  Parameters    Name                   Type     Default   Min / Max
                slice resolution in x  typein   ""        unbounded
                slice resolution in y  typein   ""        unbounded
                header size            typein   "3416"    unbounded
                swap bytes             toggle   0         0 / 1
                filename               browser  ""        unbounded

DESCRIPTION
  The "read CT slice" module reads Computed Tomography slices in
  which each sample is represented by a 16-bit integer.  This module
  assumes that the specified file contains one slice only.  The CT
  data in a file may be preceded by a header of arbitrary size.
  This module ignores header information.

INPUTS
  None.

PARAMETERS
  slice resolution in x (typein)
       Specifies the width of the slice in terms of the number of
       sample points along the horizontal axis.

  slice resolution in y (typein)
       Specifies the height of the slice in terms of the number of
       sample points along the vertical axis.

  header size (typein)
       Specifies the number of bytes (comprising the slice header)
       that precede the actual CT sample points.

  swap bytes (toggle)
       Specifies that the two bytes representing each sample should
       be swapped as they are read in.  This is to provide a means
       of avoiding platform byte-order dependencies.

  filename (browser)
       Specifies the pathname of the file containing the CT slice
       to read.

OUTPUTS
  output (field 2D 2-space scalar uniform)
       An AVS field representation of the raw CT slice data.

EXAMPLE NETWORKS
  The following network reads a CT slice, applies a thresholding
  operation, and displays the result in a window (useful for
  separating out specific tissue types contained in the raw CT slice).

                            READ CT SLICE
                                    |
                                    |
                              THRESHOLD
                                    |
                                    |
                            IMAGE VIEWER

RELATED MODULES
  Modules that can process "read CT slice" output:

       Any module that can operate on AVS field 2D scalar short data
       including but not limited to "contour to geom", "threshold",
       "image viewer", "write CT slices", and the "ip" series of
       modules.

SEE ALSO
  The "write CT slices", "image viewer", and "ip" series of modules.