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Evaluation of reconstruction fidelity based on undersampling and reconstructing fully-sampled 3He datasets acquired from one of the healthy subjects. Difference images and structural similarity (SSIM) maps for fully-sampled data versus factor 2 or 3 acceleration are shown on the right. Image differences were slightly higher and SSIM index values were slightly lower for R = 3 compared to R = 2 (see text for values).
