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(A) Recovery of the longitudinal magnetization after a radiofrequency excitation (T1) values in ascending and (B) descending colons of healthy volunteers and constipated patients given psyllium 3.5 g or 7 g t.d.s. (C) Fasting T1 in descending colon and its correlation with % water as assessed by freeze drying of the next stool passed after the MRI scan. Reproduced from [32], John Wiley and Sons 2019, with permission.
