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. 2017 Apr 25;3:15. doi: 10.1038/s41531-017-0017-1

Fig. 4.

Fig. 4

Radio-opaque marker studies of colonic transit time (CTT) using the 7-day (60 marker) protocol. a Healthy control with rapid CTT (4 markers). b PD patient with increased CTT (28 markers). c PD patient with severely increased CTT (57 markers). Note that the markers are situated mostly in the descending and recto-sigmoid colon suggestive of “outlet obstruction” constipation