Basic Study
Copyright ©The Author(s) 2015.
World J Gastroenterol. Jan 7, 2015; 21(1): 214-220
Published online Jan 7, 2015. doi: 10.3748/wjg.v21.i1.214
Table 1 Comparison of detection rates for the region of contrast agent exudation between spectral computed tomography and multidetector row computed tomography in different phases
GroupingDetection result
TotalDetection rateχ2P value
DetectedNot detected
64-slice CT in the AP23123565.71%5.1850.023
spectral CT in the AP3143588.57%
64-layer CT in the PVP3233591.43%1.39310.238
spectral CT in PVP35035100.00%
Table 2 Comparison of contrast to noise ratios values of the exudation regions at each energy level and blood flow rate between portal venous phase and arterial phase
PVPAPtP value
40 keV19.35 ± 10.897.69 ± 6.68-2.41510.036
50 keV20.82 ± 11.268.78 ± 7.21-2.3800.035
60 keV20.63 ± 10.078.83 ± 6.75-2.5750.024
70 keV15.65 ± 8.175.93 ± 4.46-2.7620.017
80 keV10.46 ± 5.833.44 ± 2.41-2.9450.012
90 keV7.33 ± 3.922.31 ± 1.52-3.1570.008
100 keV5.83 ± 2.701.49 ± 1.01-3.9960.004
Mixed-energy image11.68 ± 6.383.58 ± 2.09-3.1890.015
F18.2987.823
P value0.0000.000
Table 3 Comparison of image quality scores at each energy level and blood flow rate between portal venous phase and arterial phase
PVPAPtP value
40 keV4.63 ± 0.583.46 ± 1.431.99910.081
50 keV4.46 ± 0.653.06 ± 1.202.7240.018
60 keV4.20 ± 0.772.97 ± 1.262.1950.049
70 keV3.54 ± 0.912.23 ± 0.922.6920.020
80 keV3.00 ± 0.831.97 ± 0.872.2630.043
90 keV2.46 ± 0.551.49 ± 0.493.4940.004
100 keV2.26 ± 0.541.09 ± 0.115.65010.001
Mixed-energy imaging3.60 ± 1.132.46 ± 1.061.9530.074
F52.54919.875
P value0.0000.000