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(A) Reconstructed PET images of free-breathing monkey (7-mm diaphragm motion) with uncorrected, gated, MRI-based motion correction methods. MRI motion–correction methods significantly increased contrast compared with uncorrected image (white arrows, C = contrast) but did not increase noise, unlike gated image, which had increased noise (blue arrows, σ = SD). (B) Tagged MR images with estimated motion fields (yellow box). Ref = reference.
