New Morphological Features for Grading Pancreatic Ductal Adenocarcinomas

Table 9

Evaluation results for distinguishing between Grade 1 and Grade 2 to each feature set.

Object	Feature set	TN	FP	FN	TP	SN (%)	SP (%)	PPV (%)	NPV (%)	ACC (%)
NEN	CNF	19.60	11.70	12.40	20.30	61.25	63.44	64.35	63.29	62.34
		(6.26)	(4.97)	(6.26)	(4.97)	(19.56)	(15.52)	(8.93)	(9.49)	(7.78)
	CLF	22.40	17.30	9.60	14.70	70.00	45.94	58.39	66.13	57.97
		(5.99)	(6.95)	(5.99)	(6.95)	(18.70)	(21.70)	(10.63)	(16.21)	(5.23)
Lumen	PLF	23.80	6.50	8.20	25.50	74.38	79.69	79.65	75.40	77.03
		(1.32)	(3.95)	(1.32)	(3.95)	(4.11)	(12.35)	(10.15)	(4.96)	(6.83)
	ALF	25.20	13.40	6.80	18.60	78.75	58.13	67.05	73.46	68.44
		(2.90)	(6.31)	(2.90)	(6.31)	(9.06)	(19.72)	(9.88)	(5.85)	(7.39)
	CEF	18.60	14.50	13.40	17.50	58.13	54.69	56.45	57.03	56.41
		(4.30)	(4.14)	(4.30)	(4.14)	(13.44)	(12.95)	(7.17)	(9.10)	(7.53)
EN	PEF	22.20	8.90	9.80	23.10	69.38	72.19	71.89	70.04	70.78
		(1.14)	(2.92)	(1.14)	(2.92)	(3.55)	(9.14)	(6.94)	(4.08)	(5.26)
	AEF	22.40	11.60	9.60	20.40	70.00	63.75	65.95	68.16	66.88
		(2.32)	(2.27)	(2.32)	(2.27)	(7.25)	(7.10)	(5.42)	(5.84)	(5.50)
	CDF	22.40	17.30	9.60	14.70	70.00	45.94	58.39	66.13	57.97
		(5.99)	(6.95)	(5.99)	(6.95)	(18.70)	(21.70)	(10.63)	(16.21)	(5.23)
Duct	PDF	23.80	6.50	8.20	25.50	74.38	79.69	79.65	75.40	77.03
		(1.32)	(3.95)	(1.32)	(3.95)	(4.11)	(12.35)	(10.15)	(4.96)	(6.83)
	ADF	25.10	13.20	6.90	18.80	78.44	58.75	67.25	73.40	68.60
		(2.88)	(6.21)	(2.88)	(6.21)	(9.02)	(19.42)	(9.75)	(5.88)	(7.31)
	CTF	22.40	17.30	9.60	14.70	70.00	45.94	58.39	66.13	57.97
		(5.99)	(6.95)	(5.99)	(6.95)	(18.70)	(21.70)	(10.63)	(16.21)	(5.23)
Tissue	PTF	23.80	6.50	8.20	25.50	74.38	79.69	79.65	75.40	77.03
		(1.32)	(3.95)	(1.32)	(3.95)	(4.11)	(12.35)	(10.15)	(4.96)	(6.83)
	ATF	25.10	13.20	6.90	18.80	78.44	58.75	67.25	73.40	68.60
		(2.88)	(6.21)	(2.88)	(6.21)	(9.02)	(19.42)	(9.75)	(5.88)	(7.31)

TP (true positive): the number of Grade 2s that are correctly classified as Grade 2s.
FP (false positive): the number of Grade 1s that are incorrectly classified as Grade 2s.
FN (false negative): the number of Grade 2s that are incorrectly classified as Grade 1s.
TN (true negative): the number of Grade 1s that are correctly classified as Grade 1s.