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Pubmed for Handhelds

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  • Title: Preliminary investigation of respiratory self-gating for free-breathing segmented cine MRI.
    Author: Larson AC, Kellman P, Arai A, Hirsch GA, McVeigh E, Li D, Simonetti OP.
    Journal: Magn Reson Med; 2005 Jan; 53(1):159-68. PubMed ID: 15690515.
    Abstract:
    Segmented cine MRI generally requires breath-holding, which can be problematic for many patients. Navigator echo techniques, particularly successful for free-breathing coronary MRA, are incompatible with the acquisition strategies and SSFP pulse sequences commonly used for cine MRI. The purpose of this work is to introduce a new self-gating technique deriving respiratory gating information directly from the raw imaging data acquired for segmented cine MRI. The respiratory self-gating technique uses interleaved radial k-space sampling to provide low-resolution images in real time during the free-breathing acquisition that are compared to target expiration images. Only the raw data-producing images with high correlation to the target images are included in the final high-resolution reconstruction. The self-gating technique produced cine series with no significant differences in quantitative image sharpness to series produced using comparable breath-held techniques. Because of the difficulties associated with breath-holding, the respiratory self-gating technique represents an important practical advance for cardiac MRI. , Inc.
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