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. Author manuscript; available in PMC: 2014 Aug 26.
Published in final edited form as: NMR Biomed. 2013 Jan 10;26(7):810–828. doi: 10.1002/nbm.2899

Figure 6.

Figure 6

Two strategies to create CEST contrast when using fast MRI sequences: a) Pulse sequence diagram of a PARACEST detection method with a multiple-echo imaging scheme; b) Pulse sequence diagram of a PARACEST detection method with a short repetitive saturation scheme. For both schemes, m represents the number of selective saturation pulses that comprise 's, and R represents the number of repetitions. For presat-RARE, n represents the number of echos that are acquired per excitation (a.k.a., RARE factor), the product of n and N represents the number of phase encoding steps, and the first lobe of Gread alternates in phase for each successive echo. For presat-FLASH, N represents the number of phase encoding steps. Reproduced from Fig.1 in reference (91) with permission.