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View Diameter
The view diameter is the area that is being processed
during scanning of phantoms as well as during rasterization of
phantoms. By default, the view diameter is set equal
to the phantom diameter. It may be useful, especially for
experimental reasons, to process an area larger (and maybe even
smaller) than the phantom. Thus, during rasterization or during
projections, CTSim will ask for a view ratio,
VR. The view
diameter is then calculated as
Vd = Pd x VR
By using a
VR
less than 1, CTSim will allow
for a view diameter less than
phantom diameter.
This will lead to significant artifacts. Physically, this would
be impossible and is analogous to inserting an object into the CT
scanner that is larger than the scanner itself!