Associations between ¹⁸F-FDG-PET, DWI, and DCE Parameters in Patients with Head and Neck Squamous Cell Carcinoma Depend on Tumor Grading

Table 6

Comparison of PET and DWI values between different tumor grades.

Parameters	G1 + 2	G3 + 4	Mann–Whitney
	Mean ± SD	Mean ± SD	values
	21.11 ± 8.37	17.79 ± 9.86	0.20
	8.92 ± 3.92	7.75 ± 3.40	0.28
× 10^−3 mm^2s^−1	0.74 ± 0.15	0.69 ± 0.28	0.65
× 10^−3 mm^2s^−1	1.16 ± 0.14	1.13 ± 0.25	0.47
× 10^−3 mm^2s^−1	1.75 ± 0.25	1.79 ± 0.34	0.96
	0.20 ± 0.13	0.20± 0.12	0.93
	0.39 ± 0.16	0.70 ± 0.85	0.22
	0.55 ± 0.19	0.49 ± 0.17	0.37