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Two different dynamic decoupling strategies, the classic CPMG and the morerecently proposed UDD protocol are compared in the context of magneticresonance imaging (MRI). Both sequences were implemented on a 3T human MRIsystem and relaxometry was performed for a variety of tissue-mimicking agar andagarose gels. We find that CPMG provides moderately better decoupling than\UDD. The results are consistent with experimental noise spectra obtained from\textit{in vivo} spectroscopy results, which suggest that the type of noisespectra obtained would favor \CPMG. Theoretical coherence pathway analysisfurther suggests that \UDD\ is more susceptible to systematic errors due tostatic magnetic and radio-frequency field inhomogeneity or imperfect excitationand refocusing pulse profiles.

Comparison of CPMG and Uhrig Dynamic Decoupling (UDD) for tissue refocusing in MRI