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Phantom Diameter
The phantom diameter is automatically calculated by CTSim from
the phantom definition. The maximum of the phantom length and
height is used to define the square that completely surrounds the
phantom. Let Pl be the width
and height of this square. The diameter of this boundary box,
Pd, is given by the
Pythagorean theorem and is
Pl x sqrt(2)
CT scanners collect projections around a
circle rather than a square. The diameter of this circle is
the diameter of the boundary square
Pd.
