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Table 1 Summary values of attenuation (measured in HU) of the ROIs before and after administration of contrast medium (with the Standard Deviation)

From: Carotid artery intra-plaque attenuation variability using computed tomography

  Mean SD Minimum Maximum 2.5–97.5 P Normal Distr.
ROI 1 basal 33.818 11.0074 14 49 14.000–49.000 0.3899
ROI 1 contrast 40.273 9.1879 24 51 24.000–51.000 0.6966
ROI 2 basal 41.364 7.5534 28 52 28.000–52.000 0.5753
ROI 2 contrast 51.273 10.2868 31 62 31.000–62.000 0.0512
ROI 3 basal 41.909 11.5884 27 57 27.000–57.000 0.0872
ROI 3 contrast 56.273 13.8859 31 72 31.000–72.000 0.3031
ROI 4 basal 49.273 20.7079 28 99 28.000–99.000 0.0254
ROI 4 contrast 68.818 19.0778 43 101 43.00–101.000 0.8457
SD ROI 1 basal 7.545 2.1616 5 11 5.000–11.000 0.5274
SD ROI 1 contrast 10.364 4.081 5 20 5.000–20.000 0.0547
SD ROI 2 basal 11.818 4.3547 4 17 4.000–17.000 0.6073
SD ROI 2 contrast 17.091 9.7719 5 34 5.000–34.000 0.6494
SD ROI 3 basal 7.909 2.0226 5 11 5.000–11.000 0.3265
SD ROI 3 contrast 10.091 4.6574 4 18 4.000–18.000 0.6571
SD ROI 4 basal 10.455 4.5905 5 20 5.000–20.000 0.5176
SD ROI 4 contrast 15.545 6.1703 9 25 9.000–25.000 0.157