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. Author manuscript; available in PMC: 2011 Feb 1.
Published in final edited form as: Phys Med Biol. 2010 Feb 11;55(5):R1–R63. doi: 10.1088/0031-9155/55/5/R01

Figure 9.

Figure 9

(a) Principle of magnetization transfer imaging. The polymer proton pool has a short T2 and thus covers a broader frequency line shape than the free water proton pool. By use of off-resonance saturation rf pulses part of the polymer protons is saturated. Because of magnetization transfer, polymer protons are exchanged with the water protons resulting in a decrease in longitudinal magnetization. (b) The observed relative signal decrease (MTR) is due to both direct saturation of the water protons (Mdir) and to magnetization transfer between the water proton pool and the polymer proton pool (MMT) (De Deene et al 2006a). Reproduced with permission.