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. Author manuscript; available in PMC: 2011 Sep 1.
Published in final edited form as: Magn Reson Med. 2010 Sep;64(3):680–687. doi: 10.1002/mrm.22459

FIGURE 4.

FIGURE 4

2-D exchange spectroscopy (REXSY) representative of all HCB specimens. Each of the three T2 components appear on the main diagonal (running lower-left to upper-right), which represents stationary nuclear spins that do not transit between pools during the 200 ms REXSY mixing period and thus maintain a fixed T2. Off-diagonal cross peaks, observed between the two short-lived T2 components, indicate spins that exchange via magnetization transfer mechanisms. Thus, the protons relaxing with T2 ≈ 60 μs and ≈ 400 μs are in molecular contact during the mixing period but effectively remain isolated from the long-lived protons.