Endoscopic ultrasound elastography for solid pancreatic lesions

Table 3 The histogram parameters[5,21,45]

Images	Parameters	Information	Interpretation
Gray scale images	Mean	Mean of the gray levels	Higher mean value indicates softer tissue
	Standard deviation	Standard deviation of the gray levels	Higher value indicating heterogeneous hardness
	ASM	Measure of the homogeneity on the gray scale image
	Contrast	Measure of local gray level variation on the gray scale image
	Correlation	Measure of gray level linear
		dependence on the gray scale image
	Entropy	Measure of the randomness of gray level distribution
	IDM	Measure of the homogeneity on the gray scale image
	Skewness	Measure of the asymmetry of the gray level distribution	Higher value indicating higher or lower hardness
	Kurtosis	Measure of the “peakedness” of the gray level distribution	Higher value indicating concentration of a specific hardness
Black and white image	% area	Percentage of the white area (= hard area)
	Mean of Complexity	Complex ratio of the shape of the white area (= hard area) and is calculated as periphery2/area of the white area