Table 2.
First- and second-order texture analysis parameter values of spleen parenchyma in initial and last CT examinations.
| First order | Initial CT | Last CT | p |
|---|---|---|---|
| Entropi | 5.02[4.02/5.65] | 5.00[4.47/5.57] | 0.762 |
| Minimum | –18[–154/22] | –27[–123/12] | 0.064 |
| 10th percentile | 27[–6/40] | 24[–56/46] | 0.212 |
| 90th percentile | 66[55/108] | 70[59/99] | 0.001* |
| Maximum | 108[70/218] | 121[79/199] | 0.001* |
| Mean | 46.47[30.80/73.18] | 48.02[14.79/66.13] | 0.080 |
| Median | 46[30/73] | 48[2/66] | 0.168 |
| Interquartile range | 22[11/48] | 25[13/101] | 0.001* |
| Range | 139[44/372] | 149[68/292] | 0.003* |
| Mean absolute deviation | 13.43[4.62/29.12] | 15.05[7.40/51.14] | 0.001* |
| Standard deviation | 16.91[7.34/36.94] | 19.15[9.30/59.12] | 0.001* |
| Skewness | 0.001[–0.975/0.183] | -0.013[–0.371/0.287] | 0.457 |
| Kurtosis | 3.17[2.8/9.5] | 3.18[1.99/4.46] | 0.092 |
| Variance | 286.08[53.81/1364.19] | 366.89[86.5/524.044] | 0.004* |
| Uniformity | 0.037[0.029/0.074] | 0.037[0.024/0.054] | 0.517 |
| Gray level co-occurrence | |||
| Autocorrelation | 1090.2[695.8/2165.9] | 1127.5[706.0/1797.8] | 0.962 |
| Joint average | 32.7[26.2/46.5] | 33.2[26.4/42.3] | 0.938 |
| Cluster prominence | 89869.5[17946.9/299918.1] | 87344.4[25378.6/761017.8] | 0.431 |
| Cluster tendency | 166.5[44.9/327.5] | 165.3[80.4/634.8] | 0.325 |
| Contrast | 90.2[20.9/152.1] | 95.2[35.5/889.8] | 0.153 |
| Correlation | 0.311[0.078/0.655] | 0.279[0.072/0.894] | 0.033* |
| Difference average | 7.5[3.6/9.8] | 7.6[4.7/9.5] | 0.271 |
| Difference entropy | 4.3[3.3/40678] | 4.3[3.7/9.7] | 0.611 |
| Difference variance | 33.6[5.2/56.2] | 35.1[13.2/53.7] | 0.109 |
| Joint energy | 0.002[0.001/0.006] | 0.002[0.001/0.003] | 0.545 |
| Joint entropy | 9.7[7.8/10.1] | 9.7[4.0/10.1] | 0.774 |
| Inverse difference moment | 0.128[0.097/0.243] | 0.124[0.100/0.190] | 0.353 |
| Inverse difference | 0.216[0.179/0.336] | 0.212[0.183/0.284] | 0.317 |
| Inverse variance | 0.129[0.101/0.903] | 0.128[0.102/0.199] | 0.717 |
| Maximum probability | 0.005[0.003/0.017] | 0.005[0.001/0.009] | 0.362 |
| Sum average | 65.4[52.4/92.9] | 66.5[52.8/84.6] | 0.918 |
| Sum entropy | 5.7[6.7/6.2] | 5.7[5.2/6.5] | 0.225 |
| Gray level run length matrix | |||
| Short run emphasis | 0.966[0.472/0.978] | 0.967[0.450/0.968] | 0.092 |
| Long run emphasis | 1.1[0.3/1.3] | 1.1[1.1/1.2] | 0.175 |
| Gray level nonuniformity | 153.3[72.0/417.0] | 131.1[34.5/386.5] | 0.001* |
| Run persentage | 0.955[0.911/0.970] | 0.956[0.451/0.968] | 0.133 |
| Gray level variance | 69.0[17.4/101.1] | 65.6[30.7/168.7] | 0.825 |
| Run variance | 0.051[0.032/0.107] | 0.047[0.035/0.078] | 0.051 |
| Run entropy | 5.3[4.5/5.6] | 5.3[4.8/5.9] | 0.852 |
| Low gray level run emphasis | 0.002[0.001/0.004] | 0.002[0.001/0.004] | 0.723 |
| High gray level run emphasis | 1138.4[752.7/2176.6] | 1178.3[765.7/1819.7] | 0.940 |