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MRI data were validated by immunohistochemical staining of the contrast agent and leakage of fluorescently labeled BSA-FAM coinjected with the MRI contrast agent. Leakage of plasma proteins and deposition of a provisional matrix can support inflammation and stimulate remodeling of the colonic vasculature. Thus, the plasma protein leakage from the colonic microvasculature at the focal inflammatory patches could be quantified by MRI, providing a biomarker for assessment of disease progression. Magn Reson Med, 2011. ? 2011 Wiley-Liss, Inc. ""To test the hypothesis that a noninvasive dynamic contrast enhanced MRI (DCE-MRI) derived interstitial volume fraction (ve) and/or distribution volume (VD) were correlated with tumor cellularity in cerebral tumor. T1-weighted DCE-MRI studies were performed in 18 athymic rats implanted with U251 xenografts. http://www.selleckchem.com/products/pf-562271.html After DCE-MRI, sectioned brain tissues were stained with Hematoxylin and Eosin for cell counting. Using a Standard Model analysis and Logan graphical plot, DCE-MRI image sets during and after the injection of a gadolinium contrast agent were used to estimate the parameters plasma volume (vp), forward transfer constant (Ktrans), ve, and VD. http://www.selleckchem.com/products/VX-765.html Parameter values in regions where the standard model was selected as the best model were: (mean �� S.D.): vp = (0.81 �� 0.40)%, Ktrans = (2.09 �� 0.65) �� 10?2 http://www.selleck.cn/products/azd6738.html min?1, ve = (6.65 �� 1.86)%, and VD = (7.21 �� 1.98)%. The Logan-estimated VD was strongly correlated with the standard model's vp + ve (r = 0.91, P