Editing Scanco Administration (section)

===View RSQ projections and flat field===

It can be very useful to examine the projections that are contained in the RSQ file, as well as to see the flat field correction frames.

In the session manager, double click the RSQ file and the program ximage will open. Or, type:
  $ sh sym x
    X == "$UM:XIMAGE.EXE"
  $ x D0000018.RSQ
Then switch to xz view and go to the second slice (in this order). Then you should see a frame of the none attenuated beam (nothing in the beam, or Scanco calls it the I0 frame). If it is a multi stack measurement then there will be several copys of this frame in this image.

In an RSQ you have for each slice of the detector one dark current line and then the full intensity line followed form the radiographs taken under the different angles (sinogram). In the x direction is the detector line, in the y direction is the rotation angle (except dark and I0) and in the z direction is the z-direction of the scanner. If you switch the view to xz, then you can see the frames as acquired by the detector (or stacked frames all taken under the same rotation angle). Frame 1 is then the dark image and Frame 2 is the full intensity image.


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