Abstract #4642

Real-time Respiratory Correction of the Pilot Tone Cardiac Signal to Stabilize Triggering during Breath-holds

Yue Pan^1,2,3, Mario Bacher², Rizwan Ahmad^1,4, Orlando P Simonetti^1,3,5, and Peter Speier²

¹Department of Biomedical Engineering, The Ohio State University, Columbus, OH, United States, ²Siemens Healthineers AG, Erlangen, Germany, ³Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, OH, United States, ⁴Department of Electrical and Computer Engineering, The Ohio State University, Columbus, OH, United States, ⁵Division of Internal Medicine, The Ohio State University Wexner Medical Center, Columbus, OH, United States

Synopsis

Keywords: Motion Correction, Cardiovascular, Pilot Tone, Cardiac Trigger

Motivation: This research aims to refine Pilot Tone (PT) cardiac triggering, which can be impacted by changes in signal amplitude caused by breath-holding.

Goal(s): Its primary goal is to develop and validate a real-time correction algorithm that improves the PT cardiac trigger stability during breath-holds without introducing additional variability during free breathing.

Approach: The algorithm analyzes PT data for respiratory patterns to adapt beat-by-beat amplitude correction of the cardiac signal. The methodology was tested with different breathing paradigms at 1.5T and 3T to assess robustness.

Results: The correction successfully adjusted PT cardiac signal amplitude, reducing missed triggers across respiratory patterns without increasing triggering variation.

Impact: The described real-time correction improves the reliability of cardiac PT triggers during inspiratory breath-hold maneuvers, increasing the opportunities to replace ECG triggering with PT triggering, and therefore to eliminate the need for ECG leads.

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