Abstract #2268

Accuracy and precision of measured T1 in hepatic portal vein blood using a variety of Look- Locker and Modified Look-Locker Inversion Recovery sequences.

Svein Are Sirirud Vatnehol^1,2,3, Atle Bjørnerud⁴, Camilla Haglerød², Per Kristian Hol^1,3, Mahmood Amiry-Moghaddam^2,5, and Tryggve Holck Storås ⁴

¹The Intervention Center, Oslo University Hospital, Oslo, Norway, ²Oxy Solutions AS, Oslo, Norway, ³Faculty of Medicine, University of Oslo, Oslo, Norway, ⁴Dept. of Diagnostic Physics, Oslo University Hospital, Oslo, Norway, ⁵Institute of basic medical sciences, University of Oslo, Oslo, Norway

The longitudinal variation and averaged T1 measured in the hepatic portal vein (HPV) obtained with 12 variations of Look-Locker (LL) and Modified Look-Locker Inversion Recovery (MOLLI) sequences were compared to identify the sequence with least variation. Among the sequences studied, LL sequence with 5 beat readout and 45o flip angle and MOLLI with an acquisition scheme 10 beats readout, 5 beats recovery followed by 5 beat readout (10(5)5) were shown to be the most stable. Method of image analysis and the use of simulated versus real-time EKG did not significantly affect the stability of the T1-estimates.

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