Apparent diffusion coefficient-based histogram analysis differentiates histological subtypes of periampullary adenocarcinoma

Table 3 Results of apparent diffusion coefficient histogram analysis between intestinal-type and pancreatobiliary-type periampullary adenocarcinoma

	b = 800 s/mm2			b = 1000 s/mm2
	IPAC	PPAC	P	IPAC	PPAC	P
Mean	1.38±0.33	1.24±0.24	0.146	1.33±0.25	1.11±0.25	0.009
5th	1.01 ± 0.23	0.93 ± 0.25	0.312	0.99 ± 0.22	0.85 ± 0.27	0.094
10th	1.07 ± 0.24	0.99 ± 0.24	0.259	1.06 ± 0.23	0.89 ± 0.26	0.040
25th	1.22 ± 0.31	1.09 ± 0.24	0.146	1.16 ± 0.24	0.99 ± 0.25	0.030
50th	1.37 ± 0.33	1.23 ± 0.24	0.123	1.31 ± 0.25	1.09 ± 0.25	0.011
75th	1.51 ± 0.37	1.36 ± 0.25	0.159	1.47 ± 0.28	1.21 ± 0.25	0.004
90th	1.66 ± 0.40	1.49 ± 0.28	0.136	1.61 ± 0.32	1.32 ± 0.26	0.004
95th	1.76 ± 0.42	1.56 ± 0.30	0.136	1.68 ± 0.33	1.40 ± 0.28	0.010
ADCmin	0.87±0.32	0.82±0.30	0.583	0.89±0.24	0.79±0.27	0.227
ADCmax	1.93±0.51	1.73±0.37	0.178	1.84±0.32	1.54±0.36	0.008
Entropy	3.56±0.55	3.55±0.56	0.926	3.46±0.56	3.40±0.60	0.748

Apparent diffusion coefficient values are expressed as ×10^-3 mm²/s. IPAC: Intestinal-type periampullary adenocarcinoma; PPAC: Pancreatobiliary-type periampullary adenocarcinoma; ADC: Apparent diffusion coefficient.