Journal
MAGNETIC RESONANCE IN MEDICINE
Volume 53, Issue 1, Pages 159-168Publisher
WILEY
DOI: 10.1002/mrm.20331
Keywords
CMR; gating; triggering; navigator; cine
Funding
- Intramural NIH HHS [Z01 HL004608-08] Funding Source: Medline
- NATIONAL HEART, LUNG, AND BLOOD INSTITUTE [Z01HL004608, Z01HL004609, Z01HL004607] Funding Source: NIH RePORTER
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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. Published 2004 Wiley-Liss, Inc.
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