SEARCH Articles Figures Tables CPMG R2 Relaxation Rate Dispersion CPMG echo trains CPMG method CPMG pulse imaging sequences CPMG pulse sequence CPMG sequence CPMG spin echo sequences CPMG train Carr-Purcell Meiboom-Gill (CPMG Carr-Purcell-Meiboom-Gill CPMG) experiment Chemical exchange process CPMG experiments Imaging with CPMG echoes