A key colonic function is the formation of faeces and the growth and proliferation of the microbiota. This process is little described as it is difficult to study in vivo. We aimed to investigate it using MRI which can non-invasively monitor changes in the colonic content. In 8 healthy volunteers we observed the initial process of faecal formation following purgation. The results suggest that MRI can provide new insights into the important physiological process of faeces formation and establishment of the microbiome in the colon.
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