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Improved pixel-by-pixel MRI R2* relaxometry by nonlocal meansFeng, Yanqiu; He, Taigang; Feng, Meiyan; Carpenter, John-Paul; Greiser, Andreas; Xin, Xuegang; Chen, Wufan; Pennell, Dudley J.; Yang, Guang-Zhong; Firmin, David N. · Magnetic Resonance in Medicine · 2014