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. Author manuscript; available in PMC: 2013 Dec 1.
Published in final edited form as: Magn Reson Med. 2012 Jan 31;68(6):1774–1784. doi: 10.1002/mrm.24186

FIGURE 4. Observed effects of a sech AFP pulse on cortical bone water longitudinal magnetization.

FIGURE 4

T2 spectra (A) from a representative bone specimen at equilibrium and following an AFP pulse (5ms/5kHz) show a largely saturated bound water component (T2 ≈ 0.4 ms) and inverted pore water (T2 > 1 ms), as represented by the negative spectral amplitudes (see Methods for details). The ratio of AFP-prepared to equilibrium T2 spectral peak areas gives the APF efficiency parameter α, shown in B for a variety of AFP bandwidths (error bars represent ±1 SD across specimens).