Non-Hodgkin lymphoma response evaluation with MRI texture classification

Table 7 Summary table of texture parameters ranked 1-10 with Fisher and POE+ACC methods according to test subgroup T2-weighted images and imaging timepoints E1 and E2.

T2-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
MinNorm	14.090	24.380	0.861	0.636
CO-OCCURENCE MATRIX PARAMETERS
Difference variance S(1,-1)	24.802	17.121	0.249	0.266
Sum average S(2,2)	38.483	23.527	0.552	0.163
Contrast S(3,0)	22.618	45.195	0.087	0.025
Contrast S(3,3)	23.282	48.345	0.152	0.102
Contrast S(4,0)	26.599	44.458	0.221	0.013
Contrast S(4,4)	31.083	41.015	0.116	0.049
Difference variance S(4,4)	35.305	32.674	0.196	0.019
Contrast S(4,-4)	40.897	22.850	0.013	0.266
Sum average S(4,-4)	10.802	1.906	0.345	0.210
Contrast S(5,0)	30.110	41.229	0.422	0.007
Sum of squares S(5,0)	64.138	7.335	0.807	0.076
Difference variance S(5,0)	34.811	32.369	0.917	0.009
Contrast S(0,5)	41.519	29.671	0.055	0.210
Contrast S(5,5)	39.461	38.040	0.133	0.102
Sum of squares S(5,5)	80.906	0.000	0.972	0.906
RUN-LENGTH MATRIX PARAMETERS
Short run emphasis, 90°	10.659	12.516	0.087	0.149
Fraction of image in runs, 90°	11.662	12.685	0.101	0.124
ABSOLUTE GRADIENT PARAMETERS
Mean	18.036	44.271	0.046	0.287
Skewness	63.599	15.598	0.382	0.492

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