A quantitative comparison of the influence of individual versus population-derived vascular input functions on dynamic contrast enhanced-MRI in small animals.

Loveless ME, Halliday J, Liess C, Xu L, Dortch RD, Whisenant J, Waterton JC, Gore JC, Yankeelov TE
Magn Reson Med. 2012 67 (1): 226-36

PMID: 21688316 · PMCID: PMC3179805 · DOI:10.1002/mrm.22988

For quantitative analysis of dynamic contrast enhanced magnetic resonance imaging data, the time course of the concentration of the contrast agent in the blood plasma, or vascular input function (VIF), is required. We compared pharmacokinetic parameters derived using individual and population-based VIFs in mice for two different contrast agents, gadopentetate dimeglumine and P846. Eleven mice with subcutaneous 4T(1) breast cancer xenografts were imaged at 7 T. A precontrast T(1) map was acquired along with dynamic T(1) -weighted gradient echo images before, during, and after a bolus injection of contrast agent delivered via a syringe pump. Each animal's individual VIF and derived population-averaged VIF were used to extract parameters from the signal-time curves of tumor tissue at both the region of interest and voxel level. The results indicate that for both contrast agents, K(trans) values estimated using population-averaged VIF have a high correlation (concordance correlation coefficient > 0.85) with K(trans) values estimated using individual VIF on both a region of interest and voxel level. This work supports the validity of using of a population-based VIF with a stringent injection protocol in preclinical dynamic contrast enhanced magnetic resonance imaging studies.

Copyright © 2011 Wiley-Liss, Inc.

MeSH Terms (16)

Algorithms Animals Breast Neoplasms Cell Line, Tumor Contrast Media Female Gadolinium DTPA Humans Image Interpretation, Computer-Assisted Magnetic Resonance Imaging Mice Mice, Inbred BALB C Models, Biological Organometallic Compounds Reproducibility of Results Sensitivity and Specificity

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