Optimal b value of diffusion-weighted imaging on a 3.0T magnetic resonance scanner in Crohn’s disease

Table 1 Crohn’s disease activity index

Signs and symptoms	Multiplication factor
Number of liquid or very soft stools per day in a week	2
Abdominal pain (0 = none; 1 = mild; 2 = moderate; 3 = severe)	5
Number of complications	20
Taking loperamide/opiates for diarrhea (0 = no, 1 = yes)	30
Abdominal mass (0 = none, 2 = questionable, 5 = definite)	10
Hematocrit: male (47-Hct); female (42-Hct)	6
Percentage below predicted body weight	1
Evaluation	< 150: remission
	150-450: moderate-severe
	> 450: very serious