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Abstract #0329

Evaluation of high-amplitude pilot-tone with interference cancellation (HAPTIC) cardiac gating at 0.55T in the challenging case of arrhythmia

Bilal Tasdelen1, Ecrin Yagiz1, Ye Tian1, and Krishna S. Nayak1
1Electrical and Computer Engineering, University of Southern California, Los Angeles, CA, United States

Synopsis

Keywords: Motion Correction, Arrhythmia, pilot tone, mid field

Motivation: Cardiac gating at 0.55T with pilot tone has been elusive because the pilot tone signal scales with B0 field strength, and cardiac motion is a weak modulation. High-amplitude pilot tone with interference cancellation (HAPTIC) addresses this issue, but has not yet been tested in challenging cases.

Goal(s): To evaluate HAPTIC cardiac gating at 0.55T in the challenging case of cardiac arrhythmia.

Approach: Four subjects with cardiac arrhythmia were scanned, and HAPTIC was compared against ECG recordings. Detected R-wave jitter and false positive/negative rates are reported.

Results: Cardiac motion extraction for arrhythmia patients at 0.55T using HAPTIC is possible, and we identify failure cases.

Impact: HAPTIC could potentially replace ECG gating, even in patients with cardiac arrhythmia. This would simplify clinical workflow and serve scanners that do not have an integrated ECG.

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