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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. ${blacksquare}$ = mean value.

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