Pseudo-projection–driven, self-gated cardiac cine imaging using cartesian golden step phase encoding

Liheng Guo, J. Andrew Derbyshire, Daniel A. Herzka

Research output: Contribution to journalArticlepeer-review

Abstract

Purpose: To develop and evaluate a novel two-dimensional self-gated imaging technique for free-breathing cardiac cine MRI that is free of motion-detection overhead and requires minimal planning for motion tracking. Methods: Motion along the readout direction was extracted solely from normal Cartesian imaging readouts near ky = 0. During imaging, the readouts below a certain |ky| threshold were scaled in magnitude and filtered in time to form “pseudo-projections,” enabling projection-based motion tracking along readout without frequently acquiring the central phase encode. A discrete golden step phase encode scheme allowed the |ky| threshold to be freely set after the scan while maintaining uniform motion sampling. Results: The pseudo-projections stream displayed sufficient spatiotemporal resolution for both cardiac and respiratory tracking, allowing retrospective reconstruction of free-breathing non-electrocardiogram (ECG) cines. The technique was tested on healthy subjects, and the resultant image quality, measured by blood-myocardium boundary sharpness, myocardial mass, and single-slice ejection fraction was found to be comparable to standard breath-hold ECG-gated cines. Conclusion: The use of pseudo-projections for motion tracking was found feasible for cardiorespiratory self-gated imaging. Despite some sensitivity to flow and eddy currents, the simplicity of acquisition makes the proposed technique a valuable tool for self-gated cardiac imaging. Magn Reson Med 76:417–429, 2016.

Original languageEnglish (US)
Pages (from-to)417-429
Number of pages13
JournalMagnetic resonance in medicine
Volume76
Issue number2
DOIs
StatePublished - Aug 1 2016

Keywords

  • cardiac imaging
  • golden step
  • motion tracking
  • pseudo-projections
  • respiratory motion
  • self-gating
  • self-navigation

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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