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Scan Diameter
By default, the entire view diameter is scanned. For
experimental purposes, it may be desirable to scan an area either
larger or smaller than the view diameter. Thus, the concept
of scan ratio, SR,
arises. The scan diameter,
Sd, is the diameter over
which x-rays are collected and is defined as
Sd = Vd x SR
By default and
for all ordinary scanning, the scan ratio is to 1.
If the scan ratio is less than 1, you can expect
significant artifacts.