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Abstract #1233

Is Phonocardiogram Gating a Reliable Alternative to ECG Gating in Clinical Routine for CINE and Velocity-Encoded Phase Contrast Imaging?

Stefan Maderwald1, Stephan Orzada2, 3, Lars Haering4, Andreas Czylwik4, Thomas Schlosser3, Mark E. Ladd1, 3, Kai Nassenstein, 23

1Erwin L. Hahn Institute for Magnetic Resonance Imaging, University Duisburg-Essen , Essen, Germany; 2Erwin L. Hahn Institute for Magnetic Resonance Imaging, University Duisburg-Essen, Essen, Germany; 3Department of Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen, Essen, Germany; 4Department of Communication Systems, University Duisburg-Essen, Essen, Germany

In this study an in-house developed phonocardiogram (PCG) gating device was used to validate the diagnostic accuracy of acoustic triggered sequences in a clinical routine protocol at 1.5T. PCG- and ECG-gated cine imaging sequences for the assessment of LV global and regional function as well as velocity-encoded phase-contrast imaging sequences for flow quantification were compared. 147 consecutive patients were enrolled and evaluated. PCG-gated imaging was successful in 95%, ECG-gated in 100% of all patients. With cine imaging an excellent correlation between PCG and ECG was observed, whereas flow quantification measurements showed a wide limit of agreement for all variables analyzed.

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Keywords

abnormalities accurate acoustic additionally agreement aimed analyses analyzed aortic applications approaches artifacts artificial assessed assessment auscultation beneath beside called cardiac challenges chest cine clinical close cohort comparable comparing compensated compensation conductive conjunction consecutive contrast coronary delay device diagnostic differentiate directly disease displacement ejection elastic employed enable enables encoded enough enrolled examination excellent extent extraction fact feasible field filtering flow form forward fraction function furthermore gains gated gating generate global gradient healthy heart hydrodynamic important impulse inherent input insensitivity introduced known magnitude male many mark mass materials microphone minimize motion muscle nevertheless part parts patient patients post potential principle problem processing protocol qualitatively quality quantification quantitative random rather refinements regional relevant reliable resorting retrospectively reverse root routine scanner segments significantly software sternal strengths stroke suspected system systems systolic threshold tied tone tones toward trace trigger triggering twice ultrahigh validate valve valvular variables various velocity visually volume volumes wall whereas wide widespread year