Phantom study to assess the precision of T1 estimation by four fitting algorithms (BLESSPC, InSiL, IG fit, and Original fit) for MOLLI 5(3)3 acquisitions at FA=35° and FA=50°. Precision is represented using coefficients of variation (CoV) based on 5 repeated scans. For T1 > 400ms, the original fit was the most precise, while for very short T1 (T1 = 217.5 ms), BLESSPC and InSiL were more precise than IG fit and the original fit. IG fit was the least precise method for phantoms with T1 < 1000 ms. The CoVs of IG fit for T1 = 218 ms > 5%, which are out of the display range in (a) and (b).