Prediction of Overall Survival and Progression-Free Survival by the ¹⁸F-FDG PET/CT Radiomic Features in Patients with Primary Gastric Diffuse Large B-Cell Lymphoma

Table 2

Radiomic parameters.

Index	Matrix	Parameter
Conventional indices		SUVmin, SUVmean, SUVmax, SUVpeak, SUVStd
Advanced indices		MTV, TLG
Histogram-derived parameters		Skewness, kurtosis, entropy, energy
Shape-derived parameters		Sphericity, compacity
Texture features	GLCM	Homogeneity, energy, contrast, correlation, entropy, dissimilarity
	GLRLM	SRE/LRE, LGRE/HGRE, SRLGE/SRHGE, LRLGE/LRHGE, GLNU/RLNU, RP
	NGLDM	Coarseness, contrast, busyness
	GLZLM	SZE, LZE, LGZE, HGZE, SZLGE, SZHGE, LZLGE, LZHGE, GLNU, ZLNU, ZP

MTV: metabolic tumor volume; TLG: total lesion glycolysis; GLCM: gray-level cooccurrence matrix; GLRLM: gray-level run length matrix; SRE/LRE: short/long-run emphasis; LGRE/HGRE: low/high gray-level run emphasis; SRLGE/SRHGE: short run low/high gray-level emphasis; LRLGE/LRHGE: long-run low/high gray-level emphasis; GLNU/RLNU: gray-level nonuniformity/run length nonuniformity; RP: run percentage; NGLDM: neighborhood gray-level difference matrix; GLZLM: gray-level zone-length matrix; SZE/LZE: short/long-zone emphasis; LGZE/HGZE: low/high gray-level zone emphasis; SZLGE/SZHGE: short-zone low/high gray-level emphasis; LZLGE/LZHGE: long-zone low/high gray-level emphasis; GLNU/ZLNU: gray-level nonuniformity or zone-length nonuniformity; ZP; zone percentage.