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• W2565492510 abstract "Purpose To develop a motion‐robust wave‐encoding technique for highly accelerated free‐breathing abdominal MRI. Methods A comprehensive 3D wave‐encoding‐based method was developed to enable fast free‐breathing abdominal imaging: (a) auto‐calibration for wave‐encoding was designed to avoid extra scan for coil sensitivity measurement; (b) intrinsic butterfly navigators were used to track respiratory motion; (c) variable‐density sampling was included to enable compressed sensing; (d) golden‐angle radial‐Cartesian hybrid view‐ordering was incorporated to improve motion robustness; and (e) localized rigid motion correction was combined with parallel imaging compressed sensing reconstruction to reconstruct the highly accelerated wave‐encoded datasets. The proposed method was tested on six subjects and image quality was compared with standard accelerated Cartesian acquisition both with and without respiratory triggering. Inverse gradient entropy and normalized gradient squared metrics were calculated, testing whether image quality was improved using paired t ‐tests. Results For respiratory‐triggered scans, wave‐encoding significantly reduced residual aliasing and blurring compared with standard Cartesian acquisition (metrics suggesting P < 0.05). For non‐respiratory‐triggered scans, the proposed method yielded significantly better motion correction compared with standard motion‐corrected Cartesian acquisition (metrics suggesting P < 0.01). Conclusion The proposed methods can reduce motion artifacts and improve overall image quality of highly accelerated free‐breathing abdominal MRI. Magn Reson Med 78:1757–1766, 2017. © 2016 International Society for Magnetic Resonance in Medicine." @default.
• W2565492510 created "2017-01-06" @default.
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• W2565492510 date "2016-12-09" @default.
• W2565492510 modified "2023-10-17" @default.
• W2565492510 title "Autocalibrating motion-corrected wave-encoding for highly accelerated free-breathing abdominal MRI" @default.
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• W2565492510 doi "https://doi.org/10.1002/mrm.26567" @default.
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