4.5 Article

Self-gated cardiac cine MRI

Journal

MAGNETIC RESONANCE IN MEDICINE
Volume 51, Issue 1, Pages 93-102

Publisher

WILEY
DOI: 10.1002/mrm.10664

Keywords

CMRI; gating; triggering; cine; cardiac

Funding

  1. Intramural NIH HHS [Z01 HL004608-08] Funding Source: Medline
  2. NATIONAL HEART, LUNG, AND BLOOD INSTITUTE [Z01HL004609, Z01HL004608] Funding Source: NIH RePORTER

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The need for ECG gating presents many difficulties in cardiac magnetic resonance imaging (CMRI). Real-time imaging techniques eliminate the need for ECG gating in cine CMRI, but they cannot off er the spatial and temporal resolution provided by segmented acquisition techniques. Previous MR signal-based techniques have demonstrated an ability to provide cardiac gating information; however, these techniques result in decreased imaging efficiency. The purpose of this work was to develop a new self-gated (SG) acquisition technique that eliminates these efficiency deficits by extracting the motion synchronization signal directly from the same MR signals used for image reconstruction. Three separate strategies are proposed for deriving the SG signal from data acquired using radial k-space sampling: echo peak magnitude, kymogram, and 2D correlation. The SG techniques were performed on seven normal volunteers. A comparison of the results showed that they provided cine image series with no significant differences in image quality compared to that obtained with conventional ECG gating techniques. SG techniques represent an important practical advance in clinical MRI because they enable the acquisition of high temporal and spatial resolution cardiac cine images without the need for ECG gating and with no loss in imaging efficiency. (C) 2003 Wiley-Liss, Inc.

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