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• W4313403240 abstract "Background Optimal fluid status is an important issue in hemodialysis. Clinical evaluation of volume status and different diagnostic tools are used to determine hydration status in these patients. However, there is still no accurate method for this assessment. Purpose To propose and evaluate relative lean water signal (LWS rel ) as a water–fat MRI‐based tissue hydration measurement. Study Type Prospective. Population A total of 16 healthy subjects (56 ± 6 years, 0 male) and 11 dialysis patients (60.3 ± 12.3 years, 9 male; dialysis time per week 15 ± 3.5 hours, dialysis duration 31.4 ± 27.9 months). Field Strength/Sequence A 3 T; 3D spoiled gradient echo. Assessment LWS rel , a measurement of the water concentration of tissue, was estimated from fat‐referenced MR images. Segmentations of total adipose tissue as well as thigh and calf muscles were used to measure LWS rel and tissue volumes. LWS rel was compared between healthy subjects and dialysis patients, the latter before and after dialysis. Bioimpedance‐based body composition monitor over hydration (BCM OH) was also measured. Statistical Tests T ‐tests were used to compare differences between the healthy subjects and dialysis patients, as well as changes between before and after dialysis. Pearson correlation was calculated between MRI and non‐MRI biomarkers. A P value <0.05 was considered statistically significant. Results The LWS rel in adipose tissue was significantly higher in the dialysis cohort compared with the healthy cohort (246.8% ± 60.0% vs. 100.0% ± 10.8%) and decreased significantly after dialysis (246.8 ± 60.0% vs. 233.8 ± 63.4%). Thigh and calf muscle volumes also significantly decreased by 3.78% ± 1.73% and 2.02% ± 2.50% after dialysis. There was a significant correlation between changes in adipose tissue LWS rel and ultrafiltration volume ( r = 87), as well as with BCM OH ( r = 0.66). Data Conclusion MRI‐based LWS rel and tissue volume measurements are sensitive to tissue hydration changes occurring during dialysis. Evidence Level 2. Technical Efficacy Stage 3." @default.
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• W4313403240 date "2023-01-02" @default.
• W4313403240 modified "2023-10-17" @default.
• W4313403240 title "Assessing Tissue Hydration Dynamics Based on Water/Fat Separated <scp>MRI</scp>" @default.
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• W4313403240 doi "https://doi.org/10.1002/jmri.28581" @default.
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