pTRACK-generated normalized average T2 signal intensity and fistula volume are accurate and sensitive measures of perianal Crohn's disease activity. - Naim, Iyad; Greer, Christian; Bhatnagar, Gauraang; Hoad, Caroline; Evans, Jon; Poon, Dennis; Radford, Shellie; Tucknott, Seb; Menys, Alex; Moran, Gordon William (British Journal of Radiology, 2026)