B1 inhomogeneity and non-ideal slice profiles introduce contributions from stimulated and indirect echoes into the multi-echo spin-echo (MESE) T2 mapping sequence, leading to variations in quantitative T2 values across scanners and vendors despite the use of a harmonised scan protocol. This study used an EPG-based fitting method to include corrections for stimulated-echo effects, applied to phantom and ‘travelling kidney’ data collected on scanners from three different MR vendors (GE, Philips, Siemens). Compared with conventional monoexponential fitting, EPG-based fitting substantially reduced the inter-scanner variations of T2 measurements. This improves the harmonization of the MESE T2 mapping sequence across MR scanner vendors.
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