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• W3047513581 abstract "Purpose To describe and validate a simultaneous proton density fat‐fraction (PDFF) imaging and water‐specific T 1 mapping (T 1(Water) ) approach for the liver (PROFIT 1 ) with mapping and low sensitivity to calibration or inhomogeneity. Methods A multiecho gradient‐echo sequence, with and without saturation preparation, was designed for simultaneous imaging of liver PDFF, , and T 1(Water) (three slices in ~13 seconds). Chemical‐shift‐encoded MRI processing yielded fat‐water separated images and maps. T 1(Water) calculation utilized saturation and nonsaturation‐recovery water‐separated images. Several variable flip angle schemes across k‐space (increasing flip angles in sequential RF pulses) were evaluated for minimization of T 1 weighting, to reduce the dependence of T 1(Water) and PDFF (reduced flip angle dependence). T 1(Water) accuracy was validated in mixed fat‐water phantoms, with various PDFF and T 1 values (3T). In vivo application was illustrated in five volunteers and five patients with nonalcoholic fatty liver disease (PDFF, T 1(Water) , ). Results A sin 3 (θ) flip angle pattern (0 < θ < π/2 over k‐space) yielded the largest PROFIT 1 signal yield with negligible dependence for both T 1(Water) and PDFF. Mixed fat‐water phantom experiments illustrated excellent agreement between PROFIT 1 and gold‐standard spectroscopic evaluation of PDFF and T 1(Water) (<1% T 1 error). In vivo PDFF, T 1(Water) , and maps illustrated independence of the PROFIT 1 values from inhomogeneity and significant differences between volunteers and patients with nonalcoholic fatty liver disease for T 1(Water) (927 ± 56 ms vs. 1033 ± 23 ms; P < .05) and PDFF (2.0% ± 0.8% vs. 13.4% ± 5.0%, P < .05). was similar between groups. Conclusion The PROFIT 1 pulse sequence provides fast simultaneous quantification of PDFF, T 1(Water) , and with minimal sensitivity to miscalibration or inhomogeneity." @default.
• W3047513581 created "2020-08-10" @default.
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• W3047513581 date "2020-08-04" @default.
• W3047513581 modified "2023-10-12" @default.
• W3047513581 title "Simultaneous <b>pro</b>ton density <b>f</b>at‐fraction and <b>i</b>maging with water‐specific <b>T₁</b> mapping (PROFIT₁): application in liver" @default.
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• W3047513581 doi "https://doi.org/10.1002/mrm.28434" @default.
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