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. Author manuscript; available in PMC: 2010 Dec 2.
Published in final edited form as: Biomaterials. 2008 Feb 1;29(12):1901–1911. doi: 10.1016/j.biomaterials.2007.12.042

Fig. 4.

Fig. 4

(a) X-ray microradiographs of a gradient scaffold library (75 mm long) plus controls are shown. The white line down the middle of the gradient is from the steel wire. (b) Optical density (OD) was determined for 10 sections (7.5 mm) along microradiographs. Libraries were averaged and error bars are standard deviation (n = 2). OD values for controls are shown on ends of plot. Linear regression line has a Pearson correlation coefficient of 0.99 (P < 0.0001). (c) Data from Panel (b) was used to calculate library composition (solid circles) using the OD values of control scaffolds (pDTEc and pI2DTEc) for calibration. For comparison, library composition determined by FTIR (Fig. 2b) is shown (open circles). Linear regression lines had the Pearson correlation coefficients of 0.99 (P < 0.0001) and 0.98 (P < 0.0001) for OD (solid line) and FTIR (dashed line), respectively.