Non-Hodgkin lymphoma response evaluation with MRI texture classification

Table 4 Summary table of texture parameters ranked 1-10 with Fisher and POE+ACC methods according to test subgroup T1-weighted images and imaging timepoints E1 and E2.

T1-WEIGHTED IMAGES	R&R	R&R	Wilcoxon	Wilcoxon
E1-E2 analyses	Repeatability % of total	Reproducibility % of total	Slice thickness <8 mm p	Slice thickness >= 8 mm p
HISTOGRAM PARAMETERS
Percentile, 1%	15.349	0.069	0.286	0.672
CO-OCCURENCE MATRIX PARAMETERS
Difference entropy S(1,0)	6.874	25.411	0.074	0.018
Difference entropy S(0,1)	7.725	26.783	0.074	0.028
Difference entropy S(1,1)	6.970	24.413	0.139	0.018
Difference entropy S(2,0)	8.409	28.186	0.114	0.018
Sum average S(0,2)	52.143	4.597	0.285	0.499
Difference entropy S(2,2)	11.265	22.824	0.093	0.018
Difference entropy S(3,0)	15.434	11.836	0.241	0.018
Angular second moment S(5,-5)	18.976	7.234	0.093	0.612
Sum of squares S(5,-5)	58.267	1.780	0.721	0.310
Sum average S(5,-5)	15.420	16.235	0.445	1.000
RUN-LENGTH MATRIX PARAMETERS
Grey level nonuniformity, 0°	6.015	43.441	0.051	0.128
Grey level nonuniformity, 90°	8.822	35.055	0.028	0.091
Grey level nonuniformity, 45°	4.635	13.324	0.028	0.176
Grey level nonuniformity, 135°	4.734	39.630	0.037	0.249
ABSOLUTE GRADIENT PARAMETERS
Variance	28.133	22.699	0.445	0.018
AUTOREGRESSIVE MODEL PARAMETERS
Teta 2	65.193	2.741	0.575	0.237
Teta 4	66.319	2.285	0.575	0.398

Texture parameters are given in rows. In the columns R&R repeatability and reproducibility of total, and Wilcoxon test for fat saturation series grouped with image slice thickness less than 8 mm, and 8 mm or thicker.

ISSN: 1756-9966