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• W2314413392 abstract "Objectives The aim of this study was to assess the impact of oral water and intravenous furosemide challenges on blood oxygenation level–dependent magnetic resonance imaging measurements in the kidney and to examine the contribution of R2 (=1/T2) to changes in R2* (=1/T2*). Materials and Methods This Health Insurance Portability and Accountability Act–compliant study had institutional review board approval, and written informed consent was obtained from all subjects. Nine healthy volunteers were imaged at 3 T on 2 visits. During each visit, a baseline fasting magnetic resonance acquisition was followed by a diuretic challenge: oral water load for the first visit and furosemide for the second. R2* and R2 values in the renal cortex and medulla were measured using multiple gradient echo and multiple spin echo sequences, respectively, and R2’ values were computed as R2’ = R2* − R2. Timed urinary output was also measured. Results Averaged across all subjects, the R2* response to furosemide was greater than to water and greater in the medulla than the cortex. The mean R2 responses exhibited the same trends but were uniformly smaller than the mean R2* responses. The peak changes in R2* and R2 appeared, on average, 10 to 14 minutes before peak urinary output. The median percentage contribution of R2 to R2* changes was 16% in the medulla after both challenges. In the cortex, the median contribution was 48% after water load and 58% after furosemide challenge. Conclusions The contributions of R2 to R2* changes after water load and furosemide challenge are not negligible, especially in the renal cortex. In routine clinical practice, R2* could be used alone as a rough surrogate for R2’ in the medulla. However, in the cortex, both R2 and R2* should be measured to obtain accurate values of R2’." @default.
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• W2314413392 date "2013-07-01" @default.
• W2314413392 modified "2023-09-23" @default.
• W2314413392 title "Renal Blood Oxygenation Level–Dependent Imaging" @default.
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• W2314413392 doi "https://doi.org/10.1097/rli.0b013e3182823591" @default.
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