Metric optimized gating for fetal cardiac MRI

Michael S. Jansz, Mike Seed, Joshua F.P. Van Amerom, Derek Wong, Lars Grosse-Wortmann, Shi Joon Yoo, Christopher K. MacGowan

Research output: Contribution to journalArticlepeer-review

51 Scopus citations

Abstract

Phase-contrast magnetic resonance imaging can be used to complement echocardiography for the evaluation of the fetal heart. Cardiac imaging typically requires gating with peripheral hardware; however, a gating signal is not readily available in utero. No successful application of existing technologies to human fetal phase-contrast magnetic resonance imaging has been reported to date in the literature. The purpose of this work is to develop a technique for phase-contrast magnetic resonance imaging of the fetal heart that does not require measurement of a gating signal. Metric optimized gating involves acquiring data without gating and retrospectively determining the proper reconstruction by optimizing an image metric. The effects of incorrect gating on phase contrast images were investigated, and the time-entropy of the series of images was found to provide a good measure of the level of corruption. The technique was validated with a pulsatile flow phantom, experiments with adult volunteers, and in vivo application in the fetal population. Images and flow curves from these measurements are presented. Additionally, numerical simulations were used to investigate the degree to which heart rate variability affects the reconstruction process. Metric optimized gating enables imaging with conventional phase-contrast magnetic resonance imaging sequences in the absence of a gating signal, permitting flow measurements in the great vessels in utero.

Original languageEnglish (US)
Pages (from-to)1304-1314
Number of pages11
JournalMagnetic Resonance in Medicine
Volume64
Issue number5
DOIs
StatePublished - Nov 2010
Externally publishedYes

Keywords

  • Fetal MRI
  • Gating
  • Image metric
  • Phase contrast
  • Post-processing

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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