Table 4.

Package-specific default GLCM parameters and GLCM parameters that were modified to maximize consistency among radiomics packages.

GLCM parameter	A1	A2	MaZda	IBEX
Package-specific default
Gray-level limits	$[-\mathrm{1500,1500}]$	[Min PV, Max PV]	[1,4096]	[Min PV, Max PV]
Number of gray levels	3001	64	256	(Max PV – Min PV)
Number of directions	4	8	4	8
Consistenta GLCM parameters
Gray-level limits	[Min PV, Max PV]	[Min PV, Max PV]	1 to 4096b	[Min PV, Max PV]
Number of gray levels	64	64	64	64
Number of directions	8	8	4b	8

PV = pixel value.

^aParameters were modified to maximize consistency across packages.

^bThese parameters could not be modified.