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Center-Detector Length
The center-detector length,
C,
is the distance from the center of
the phantom to the center of the detector array. The center-detector length is set as a ratio,
CR,
of the view radius. The center-detector length is
calculated as
F = (Vd / 2) x CR
For parallel geometry scanning, the center-detector length doesn't matter.
A value of less than 1 is physically impossible and it analagous to
having the detector array inside of the view diameter.