Abstract #2431

R2* relaxation rates of pelvic lymph nodes in USPIO-enhanced MRI of rectal cancer patients at 3 and 7T

Tijmen Koëter¹, Rutger CH Stijns¹, Bart JW Philips², Jurgen J Futterer², Patrick Zamecnik², Sjaak JA van Asten², Marnix C Maas², and Tom WJ Scheenen²

¹Radiology and Nuclear Medicine, Department of Surgery, Radboudumc, Nijmegen, Netherlands, ²Radiology and Nuclear Medicine, Radboudumc, Nijmegen, Netherlands

Six patients with rectal cancer underwent USPIO-enhanced MRI at 3 and 7T. The presence and appearance of lymph nodes was annotated by two trained radiologists. Lymph nodes were matched between 3 and 7T, and ROIs were drawn inside the nodes to calculate mean R2* relaxation rates in order to assess the possibilities of quantitative thresholds in R2* between suspicious and benign lymph nodes at both field strengths.

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