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Fig. 4. Graph shows standard deviation (SD) values of eight regions
of interest on multidetector high-resolution CT of phantom. Highest SD values
and lowest SD values are indicated with lines, and mean SD values are
indicated with points. There is no significant difference between SD values of
axial 1.25 mm x 4i (four images per gantry rotation) mode and those of
helical 1.25-mm high-quality mode on multidetector CT. However, there were
significant differences between SD values of axial mode and those of helical
high-quality mode (p<0.01), between those of axial mode and
helical high-speed mode (p<0.05), and between those of helical
high-quality mode and helical high-speed mode (p<0.01) of same
slice collimation. Noise of axial mode was larger than that of helical
high-quality mode, but smaller than that of helical high-speed mode on same
slice thickness.
= mean value.
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