Evaluating the Impact of High Intensity Interval Training on Axial Psoriatic Arthritis Based on MR Images

. 2022 Jun 8;12(6):1420. doi: 10.3390/diagnostics12061420

Intensity features	$i_{1}$	Grey-level intensity value of the central pixel
	$i_{2}$	Mean of grey-level intensity values
	$i_{3}$	Median of grey-level intensity values
	$i_{4}$	Standard deviation of grey-level intensity values
	$i_{5}$	Minimum of grey-level intensity values
	$i_{6}$	Maximum of grey-level intensity values
	$i_{7}$	Semi-interquartile range of the grey-level intensity values
Gradient features	$g_{1}$	Sum of $L 1_{n o r m}$
	$g_{2}$	Sum of $L 2_{n o r m}$
	$g_{3}$	Mean of $L 1_{n o r m}$
	$g_{4}$	Mean of $L 2_{n o r m}$
	$g_{5}$	Standard deviation of $L 1_{n o r m}$
	$g_{6}$	Standard deviation of $L 2_{n o r m}$
	$g_{7}$	Median of $L 1_{n o r m}$
	$g_{8}$	Minimum of $L 1_{n o r m}$
	$g_{9}$	Maximum of $L 1_{n o r m}$
	$g_{10}$	Semi-interquartile range of $L 2_{n o r m}$
GLCM features	$\sqrt{f_{1}}$	energy
	$f_{2}$	contrast
	$f_{3}$	correlation
	$f_{5}$	homogeneity (inverse difference moment)
GLCM: grey level co-occurrence matrix