Table 2.

Tumor volume change under diverse operations in relation to the accurately outlined tumor

Dataset		Erosion	Smoothing	Dilation	Dilation5	Dilation7
NPC group	CET1-w	0.767 (0.757–0.777)	0.991 (0.989–0.992)	1.350 (1.334–1.366)	1.606 (1.579–1.634)	1.976 (1.932–2.021)
	T2-w	0.745 (0.734–0.757)	0.987 (0.985–0.988)	1.388 (1.369–1.407)	1.675 (1.641–1.708)	2.089 (2.035–2.144)
SLN group	DWI	0.664 (0.639–0.674)	0.959 (0.952–0.964)	1.578 (1.531–1.598)	2.080 (1.979–2.107)	2.858 (2.654–2.882)
	T2-FS	0.788 (0.773–0.802)	0.985 (0.983–0.987)	1.333 (1.307–1.358)	1.609 (1.560–1.658)	2.019 (1.933–2.105)

Note that the value (mean with 95% confidence interval) in the table represents the ratio of the tumor volume after corresponding operations to the original volume

Erosion erosion operation, Smoothing smoothing operation, Dilation dilation with structural element radius size of 3, Dilation5 dilation with structural element radius size of 5, Dilation7 dilation with structural element radius size of 7