ArticleMagnetic resonance in medicine2025
Contactless cardiac gating at 0.55T using high-amplitude pilot tone with interference cancellation (HAPTIC).
Article in Magnetic resonance in medicine, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed.
- Dynamic Mode Decomposition (DMD) for Low-Latency Real-Time Cardiac MRI.Magnetic resonance in medicine · 2026Article
- 4D Flow MRI at 0.6 T-Self-Gating Versus Camera-Based Respiratory Binning.Bioengineering (Basel, Switzerland) · 2026Article
- Free-breathing 3D pulmonary ventilation mapping at 0.55 T using stack-of-spiral out-in bSSFP.Magnetic resonance in medicine · 2026Article
- Contactless cardiac gating at 0.55T using high-amplitude pilot tone with interference cancellation (HAPTIC).Magnetic resonance in medicine · 2025Article
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Authors and funding
5 authors.
Funding
Abstract
purposeTo enable contactless cardiac gating at 0.55T using pilot tone (PT). Current PT methods are unable to extract weak motions, including cardiac motion, at lower B
methodsWe utilize high-amplitude pilot tone with interference cancellation, termed HAPTIC. The use of high amplitude PT improves sensitivity to cardiac motion, but introduces noise leakage into the imaging bandwidth. This leakage is removed using External Dynamic InTerference Estimation and Removal (EDITER) interference cancellation. HAPTIC performance at 0.55T is evaluated in healthy volunteers and patients with cardiac arrhythmia, over a 100-fold range in PT amplitude. Contactless HAPTIC gating performance is compared against conventional electrocardiogram (ECG). Noise enhancement due to HAPTIC is evaluated using noise-only scans acquired with varying PT amplitude levels.
resultsWe demonstrate robust extraction of cardiac PT signals at 0.55T, with cardiac gating (ECG vs. HAPTIC) jitter <9 ms, and noise enhancement ˜12%-35%. We demonstrate the ability to track cardiac and respiratory phase during real-time MRI and demonstrate reliable separation of cardiac and respiratory phases for retrospective binning using HAPTIC. Furthermore, we demonstrate that HAPTIC provides accurate cardiac gating in the challenging case of arrhythmia to showcase initial feasibility.
conclusionHAPTIC enables contactless cardiac gating at 0.55T, which has not previously been demonstrated with any PT variant. This could simplify clinical workflow and could serve as a solution for mid- and low-field MRI scanners that do not include built-in physiological monitoring.
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