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Table 2 Results of quantitative analysis

From: Feasibility of utilizing ultra-low-dose contrast medium for pancreatic artery depiction using the combination of advanced virtual monoenergetic imaging and high-concentration contrast medium: an intra-patient study

Parameters ND-CM images* LD-CM images* LD-CM VMI+ images* p1 value p2 value p3 value
Average value (HU)
Aorta 337.8 ± 55.36 260.16 ± 73.08 1029.76 (735.08 ,1223.75)  < 0.0001  < 0.0001  < 0.0001
Celiac artery 343.42 ± 56.01 285.32 (213.88, 325.31) 1078.28 (817.35, 1219.92)  < 0.0001  < 0.0001  < 0.0001
SMA 346.65 ± 60.24 285.27 (211.30, 336.15) 1034.77 (713.07, 1227.04)  < 0.0001  < 0.0001  < 0.0001
Right Erector spinae muscles 53.76 ± 6.26 53.68 ± 4.98 66.79 ± 10.60 0.3471  < 0.0001  < 0.0001
Image noise (HU)
Right Erector spinae muscles 19.99 ± 3.67 19.79 ± 3.33 44.15 ± 9.41 0.5136  < 0.0001  < 0.0001
Signal to noise ratio (SNR)
Aorta 13.38 ± 2.92 10.38 ± 2.64 12.06 ± 3.29  < 0.0001** 0.0465** 0.0113**
Celiac artery 15.27 ± 4.10 11.94 ± 3.64 13.67 (10.27, 15.27)  < 0.0001 0.6911  < 0.0001
SMA 15.1 ± 3.45 11.58 ± 3.55 14.25 ± 5.09  < 0.0001 1.0000  < 0.0001
Contrast to noise ratio (CNR)
Aorta 14.57 ± 3.64 10.46 ± 3.81 20.71 ± 7.30  < 0.0001  < 0.0001  < 0.0001
Celiac artery 14.86 ± 3.71 10.85 ± 4.00 21.23 ± 7.17  < 0.0001  < 0.0001  < 0.0001
SMA 15.03 ± 3.94 10.86 ± 4.06 21.00 ± 7.30  < 0.0001  < 0.0001  < 0.0001
  1. Data are means ± standard deviations or Median (P25, P75)
  2. *ND-CM: normal dose contrast medium (320 mgI/kg), LD-CM: low dose contrast medium (224 mgI/kg), VMI+ LD-CM images: advanced virtual monoenergetic imaging of LD-CM images
  3. **p value was calculated by R
  4. P1: the difference between ND-CM images and LD-CM images; P2: the difference between ND-CM images and VMI+ LD-CM images; P3: the difference between LD-CM images and VMI+ LD-CM images by using the randomized block ANOVA analysis or Friedman test. p < 0.05 is considered statistically significant