Perfusion imaging by arterial spin labeling (ASL) can be highly sensitive to the transit time from the labeling site to the tissue. We report the results of a study designed to separate the transit time and perfusion contributions to activation in ASL images accompanying motor and visual stimulation. Fractional transit time decreases were found to be comparable to fractional perfusion increases...

This prospective study investigated the value of segmental colonic transit time studies in the surgical treatment of slow transit constipation. Overall, 346 patients with chronic constipation were analysed; slow transit constipation was diagnosed in 86 (25 per cent). Based on the results of segmental colonic transit time studies, 18 patients underwent partial left-sided colectomy and 24 subtota...

The study of the dynamic relationship between topological structure of a transit network and the mobility patterns of transit vehicles on this network is critical towards devising smart and time-aware solutions to transit management and recommendation systems. This paper proposes a time-varying graph (TVG) to model this relationship. The effectiveness of this proposed model has been explored by...