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• W2031650643 abstract "Abstract Purpose To compare T 1 values of blood and myocardium at 1.5T and 3T before and after administration of Gd‐DTPA‐BMA in normal volunteers, and to evaluate the distribution of contrast media between myocardium and blood during steady state. Materials and Methods Ten normal subjects were imaged with either 0.1 mmol/kg ( N = 5) or 0.2 mmol/kg ( N = 5) of Gd‐DTPA‐BMA contrast agent at 1.5T and 3T. T 1 measurements of blood and myocardium were performed prior to contrast injection and every five minutes for 35 minutes following contrast injection at both field strengths. Measurements of biodistribution were calculated from the ratio of ΔR 1 (Δ R 1myo /Δ R 1blood ). Results Precontrast blood T 1 values (mean ± SD, N = 10) did not significantly differ between 1.5T and 3T (1.58 ± .13 sec, and 1.66 ± .06 sec, respectively; P > 0.05), but myocardium T 1 values were significantly different (1.07 ± .03 sec and 1.22 ± .07 sec, respectively; P < 0.05). The field‐dependent difference in myocardium T 1 postinjection (T 1 @3T – T 1 @1.5T) decreased by approximately 72% relative to precontrast T 1 values, while the field‐dependent difference of blood T 1 decreased only 30% postcontrast. Measurements of Δ R 1myo /Δ R 1blood were constant for 35 minutes postcontrast, but changed between 1.5T and 3T (0.46 ± .06 vs. 0.54 ± .06, P < 0.10). Conclusion T 1 is significantly longer for myocardium (but not blood) at 3T compared to 1.5T. The differences in T 1 due to field strength are reduced following contrast administration, which may be attributed to changes in Δ R 1myo /Δ R 1blood with field strength. J. Magn. Reson. Imaging 2006. © 2006 Wiley‐Liss, Inc." @default.
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• W2031650643 date "2006-02-02" @default.
• W2031650643 modified "2023-10-17" @default.
• W2031650643 title "Effect of Gd-DTPA-BMA on blood and myocardial T1 at 1.5T and 3T in humans" @default.
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• W2031650643 doi "https://doi.org/10.1002/jmri.20504" @default.
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