To produce a high quality image we need both accurate
volume data and good rendering techniques. Several papers have explored
the effect of scan parameters, such as collimation, table increment(pitch),
and reconstruction interval on the accuracy of the data
produced [2], [4].
Brink et al. showed that for contrast material-enhanced vessels, a decrease in collimation from 2 mm to 1 mm resulted in an increase in noise. Also, the noise is doubled when collimation is decreased from 3 mm to 2 mm. It makes almost no difference in the final image whether 0.5 mm or 1.0 mm reconstruction intervals are used. A pitch of 2 is marginal for 2 mm collimation. Accurate data for analyzing renal artery stenosis is best depicted with 3 mm collimation, 2 mm - 4 mm pitch (table increment) and 1 mm reconstruction interval.