Image-based coronary tracking and beat-to-beat motion compensation: Feasibility for improving coronary MR angiography

Maneesh Dewan, Gregory D. Hager, Christine H. Lorenz

Research output: Contribution to journalArticlepeer-review

Abstract

A method to reduce the effect of motion variability in MRI of the coronary arteries is proposed. It involves acquiring real-time low-resolution images in specific orthogonal orientations, extracting coronary motion from these images, and then using this motion information to guide high-resolution MR image acquisition on a beat-to-beat basis. The present study establishes the feasibility and efficacy of the proposed approach using human motion data in an offline implementation, prior to future online implementation on an MRI scanner. To track the coronary arteries in low-resolution real-time MR images in an accurate manner, a tracking approach is presented and validated. The tracking algorithm was run on real-time images acquired at 15-20 frames per second in four-chamber, short-axis, and coronal views in five volunteers. The systolic and diastolic periods in the cardiac cycles, computed from the extracted motion information, had significant variability during the short time periods typical of cardiac MRI. It is also demonstrated through simulation analysis using human tracked coronary motion data that accounting for this cardiac variability by adaptively changing the trigger delay for acquisition on a beat-to-beat basis improves overall motion compensation and hence MR image quality evaluated in terms of SNR and CNR values.

Original languageEnglish (US)
Pages (from-to)604-615
Number of pages12
JournalMagnetic resonance in medicine
Volume60
Issue number3
DOIs
StatePublished - Sep 2008

Keywords

  • Adaptive trigger delay
  • Coronary magnetic resonance angiography
  • Heart rate variability
  • Image-based motion tracking
  • Motion compensation
  • Template tracking

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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