Electronic Posters: Cardiovascular

Thursday 13:30-14:00 Computer 39

13:30 3740. Comparison of Techniques for the Measurement of Tissue-Blood Partition Coefficients in Healthy and Infarcted Myocardium

James W. Goldfarb^1,2, Wenguo Zhao<sup>1

1</sup>Saint Francis Hospital, Roslyn, NY, United States; ²Program in Biomedical Engineering, Stony Brook University, Stony Brook, NY, United States

The purpose of this study was to investigate the temporal dynamics a two-compartment tissue-blood partition coefficient and compare it to estimates using a three-compartment model. In 25 individuals with chronic myocardial infarctions, blood Gd-concentration was modeled with a bi-exponential and myocardial tissue Gd-concentration with a three-compartment model. It was found that the measurement of the tissue-blood partition coefficient based on the ratio of T1 relaxation time differences is time dependent.. The measurement of the tissue-blood partition coefficient using a three compartment model yields similar values between infarcted and viable myocardium. T1 relaxation differences are likely due to a third trapping compartment.