Table 1. Comparisons of different parameters in tumor and the normal rectal wall.

Parameters	Tumor	Normal	CV (tumor)	t	P*
Standard-ADC (×10−3 mm2/s)	0.820 ± 0.072	1.414 ± 0.132	8.78%	30.787	<0.001
Slow ADC-Mono (×10−3 mm2/s)	0.609 ± 0.049	1.080 ± 0.095	8.05%	35.213	<0.001
Fast ADC-Mono (×10−3 mm2/s)	10.692 ± 4.003	12.366 ± 7.185	37.44%	1.42	0.161
f-Mono	0.278 ± 0.044	0.414 ± 0.094	15.83%	9.913	<0.001
Slow ADC-bi (×10−3 mm2/s)	0.538 ± 0.167	1.155 ± 0.259	31.04%	14.866	<0.001
Fast ADC- bi (×10−3 mm2/s)	42.891 ± 19.588	70.358 ± 28.677	45.67%	6.104	<0.001
f- bi	0.318 ± 0.069	0.306 ± 0.085	21.70%	0.812	0.42
α value	0.724 ± 0.043	0.781 ± 0.074	5.94%	4.704	<0.001
DDC (×10−3 mm2/s)	0.850 ± 0.141	1.722 ± 0.415	16.59%	15.707	<0.001

All values are expressed as mean ± SD. f-Mono, f-bi and α have no unit. DDC (distributed diffusion coefficient), α (alpha, the heterogeneity of intra-voxel diffusion), CV (coefficient of variation).

^*The comparison between tumor and normal rectal wall for every parameter was used by the Student’s Test. P < 0.05 was considered significant.