FIG. 1.

(a) Diagram of the AREX_double,vdc and MTR_double,vdc sequences, which have label and reference scans that vary the flip angle of the pulse trains while maintaining the same average irradiation power. Unlike in our previous work, the DC varies, with the train of π pulses at 70% dc and the 2π pulses at 30% dc. (b) Simulated amide labeling efficiency (η) vs. DC for π and 2π pulse trains at a B_{avg power} of 1 µT.