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Abstract #3660

Evaluation of background phase errors from eddy currents and mechanical oscillations in phase contrast magnetic resonance imaging

Simon Olof Anders Thalén1,2, Michael Loecher1,2, and Daniel Bruce Ennis1,2
1Radiological Sciences Laboratory, Stanford University, Stanford, CA, United States, 2Division of Radiology, Veterans Administration Health Care System, Palo Alto, CA, United States

Synopsis

Keywords: Flow, System Imperfections: Measurement & Correction, Phase Error

Motivation: Background phase errors in PC-MRI include eddy currents and mechanical oscillations. Relative contributions over a wide range of velocity encoding gradients (VENCs) remain underexplored.

Goal(s): To evaluate background phase errors across clinically relevant VENCs, characterizing the impact of eddy currents and mechanical oscillations.

Approach: Waveforms with a range of VENCs were generated, and the gradient impulse response function was used to predict phase errors as a sum of eddy current and mechanical oscillation effects. Phantom experiments across different VENCs were conducted.

Results: Eddy current effects dominated lower VENCs. Between approximately 52 and 92 cm/s the phase error was largely oscillatory.

Impact: The necessary correction for background phase errors depends on the VENCs, which explains why errors are protocol dependent.

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