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. Author manuscript; available in PMC: 2010 May 11.
Published in final edited form as: Magn Reson Med. 2008 Dec;60(6):1433–1443. doi: 10.1002/mrm.21771

Figure 2. Comparison of polymer blend and porcine bone proton relaxation parameters, and typical SMRI images of polymer phantoms.

Figure 2

a) Single-pulse proton spectrum of the 20% PEO/PMMA blend. The molecular weights of PEO and PMMA were 3,400 and 35,000 respectively. The linewidth at half height of the polymer is around 1.9 kHz at room temperature. b) WASPI spectrum of a porcine bone specimen without projection gradients. The full width of the observed resonance at half height is around 1.8 kHz. c) Polymer phantom: T1 = 3.6 s, excitation angle = 12°. d) Porcine bone specimen: T1 = 3.4 s, excitation angle=13°. T1s were obtained by fitting data acquired with progressive-saturation sequences to Eq. [3]. e) The typical SMRI images of four polymer phantoms, whose densities were 1.171, 0.800, 0.557 and 0.402 g/cm3 respectively. f) The least squares fit of known polymer calibration phantom densities to their MRI intensities, r2= 0.99.