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. Author manuscript; available in PMC: 2013 Mar 1.
Published in final edited form as: Neuroimage. 2011 Dec 10;60(1):1–6. doi: 10.1016/j.neuroimage.2011.11.091

Fig. 3.

Fig. 3

in vivo MTRasym is associated with tissue pH during acute stroke. MTRasym can be described as a superposition of pH-dependent APT contrast (APTR) and MT asymmetry baseline shift (ΔMTR′asym). The labile amide proton concentration and ΔMTR′asym were numerically solved from Eq.2, being 1/867 and −7.44%, respectively. In addition, we calculated the contralateral normal tissue pH from quantitative APT MRI (Eq. 4), and overlaid its MTRasym (open squares).