Table 3.

Mean MCC and HD scores using U-Net for lymph node segmentation with single versus all scanners training strategy. P-values are based on MCC scores between train and test scanners when the U-Net is applied.

Train scanner		Test scanner	MCC	HD (μm)	P-value
Single scanner	A	A	0.80 ± 0.22	141.95 ± 82.36	2.72E − 25
		B	0.76 ± 0.23	85.03 ± 41.89
		C	0.81 ± 0.20	150.91 ± 79.45
		D	0.38 ± 0.40	248.79 ± 132.49
	B	A	0.78 ± 0.20	149.63 ± 83.08	3.74E − 29
		B	0.81 ± 0.20	87.52 ± 46.23
		C	0.79 ± 0.20	159.13 ± 78.71
		D	0.22 ± 0.27	284.86 ± 122.38
	C	A	0.78 ± 0.20	154.20 ± 91.41	1.02E − 44
		B	0.79 ± 0.20	90.81 ± 47.93
		C	0.81 ± 0.19	156.70 ± 79.84
		D	0.18 ± 0.22	292.53 ± 119.52
	D	A	0.69 ± 0.29	170.25 ± 100.26	2.52E − 16
		B	0.84 ± 0.18	74.77 ± 41.86
		C	0.87 ± 0.15	132.36 ± 71.71
		D	0.83 ± 0.19	149.67 ± 83.95
All scanners		A	0.82 ± 0.21	133.74 ± 76.78	1.03E − 19
		B	0.85 ± 0.21	80.00 ± 42.21
		C	0.82 ± 0.20	146.01 ± 71.24
		D	0.76 ± 0.25	162.67 ± 82.14