On the Origin of Signal and Bandwidth of Converse Magnetoelectric Magnetic Field Sensors DOI Creative Commons
Elizaveta Spetzler, Benjamin Spetzler, Dennis Seidler

et al.

Advanced Sensor Research, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 16, 2024

Abstract Converse magnetoelectric sensors enable the detection of low‐frequency and low‐amplitude magnetic fields over a bandwidth several kilohertz by combining electrical excitation resonator via piezoelectric layer with an inductive readout. Here, comprehensive sensor model is presented to further foster development this promising concept. The relates output signal device characteristics, taking into account magnetoelastic electromechanical properties, geometry, operating conditions. system thoroughly experimentally analyzed validate model. Based on analysis, concept explained in detail, including origin its loss their connection magneto‐mechanical magnetostrictive layer. Significant advances have been made understanding converse sensors, providing solid basis for future improvements systems.

Language: Английский

Machine Learning-Based Automated Method for Effective De-noising of Magnetocardiography Signals Using Independent Component Analysis DOI

C. Kesavaraja,

S. Sengottuvel,

Rajesh Patel

et al.

Circuits Systems and Signal Processing, Journal Year: 2024, Volume and Issue: 43(8), P. 4968 - 4990

Published: May 13, 2024

Language: Английский

Citations

2
Optical pump magnetometers parametric correction method based on three-axis coil arrays DOI
Shuang Liang, Yanyan Zhu,

Junhuai He

et al.

Measurement, Journal Year: 2024, Volume and Issue: unknown, P. 115909 - 115909

Published: Oct. 1, 2024

Language: Английский

Citations

2
Development and validation of a clinical diagnostic model for myocardial ischaemia in borderline coronary lesions based on optical pumped magnetometer magnetocardiography: a prospective observational cohort study DOI Creative Commons
Shuwen Yang, Lanxin Feng, Mingduo Zhang

et al.

BMJ Open, Journal Year: 2024, Volume and Issue: 14(10), P. e086433 - e086433

Published: Oct. 1, 2024

To develop and validate a clinical diagnostic model based on optical pumped magnetometer magnetocardiography (OPM-MCG) for the detection of myocardial ischaemia in patients with borderline coronary lesions prior to invasive angiography (ICA).

Language: Английский

Citations

2
Single-board low-noise fluxgate magnetometer DOI Creative Commons
T. Dyer, Paul F. Griffin, Erling Riis

et al.

Journal of Applied Physics, Journal Year: 2024, Volume and Issue: 135(3)

Published: Jan. 17, 2024

Low-noise fluxgate magnetometers are normally comprised of three separate devices: a power supply, the sensor head/electronics and an analog-to-digital converter (ADC). This paper presents parallel rod magnetometer in single printed circuit board size=5×12 cm, weight=45 g, head average dissipation = 40 mW. The open-loop noise spectral density =5pTrms/Hz@1Hz, competitive with state-of-the-art devices. is realized using new amorphous wire core material programmable mixed-signal electronics low amplifier ADC noise. We have compared performance to low-noise observatory found sub-nT correlation when tracking Y (East-West) component Earth’s geomagnetic field.

Language: Английский

Citations

1
Magnetocardiography in the Evaluation of Sudden Cardiac Death Risk: A Systematic Review DOI Creative Commons
Thomas Lachlan, Hejie He, Kengo Kusano

et al.

Annals of Noninvasive Electrocardiology, Journal Year: 2024, Volume and Issue: 29(6)

Published: Oct. 25, 2024

ABSTRACT Sudden cardiac death (SCD) is responsible for 15%–20% of deaths globally/year, predominantly due to ventricular arrhythmias (VA) caused by vulnerable substrate. Identifying those at risk has proved difficult with several limitations current methods. We evaluated the evidence magnetocardiography (MCG) in predicting SCD events. searched Embase/Medline databases English language papers evaluating MCG patients VA. A total 119 were screened 27 included analysis (23 case–controlled, four cohort studies); study sizes varied ( n = 12 158). Etiology was ischemic cardiomyopathy (ICM) 22, dilated 2, arrhythmogenic 1 and mixed 2. In ICM there consistent discriminatory features seen using time‐based signal‐complexity measures that persisted when independence these parameters. Current flow demonstrated promising results other etiologies. The studied support role identifying substrate VA, particularly ICM.

Language: Английский

Citations

1
Accurate diagnosis of ischemic heart disease without exposure to radiation using non-stress unshielded magnetocardiography DOI Creative Commons

Kirsten Tolstrup,

Mojtaba Akhtari,

Donatella Brisinda

et al.

American Heart Journal Plus Cardiology Research and Practice, Journal Year: 2024, Volume and Issue: 49, P. 100483 - 100483

Published: Nov. 14, 2024

To evaluate the capability and accuracy of magnetocardiography (MCG) to identify patients with ischemic chest pain from those non-ischemic verify normalcy in MCG healthy subjects.

Language: Английский

Citations

1
Motion artifact variability in biomagnetic wearable devices DOI Creative Commons
Negin Ghahremani Arekhloo, Huxi Wang, Hossein Parvizi

et al.

Frontiers in Medical Technology, Journal Year: 2024, Volume and Issue: 6

Published: Oct. 17, 2024

Motion artifacts can be a significant noise source in biomagnetic measurements when magnetic sensors are not separated from the signal source. In ambient environments, motion up to ten times stronger than desired signals, varying with environmental conditions. This study evaluates variability of these and effectiveness gradiometer reducing them such settings. To achieve objectives, we first measured single channel output field conditions observe effect homogeneous gradient background fields. Our analysis revealed that artifact within an environment is primarily influenced by rather one. Subsequently, configured parallel vertical alignment direction vibration (X-axis). findings indicated ranging 1 nT/mm 10 nT/mm, single-channel sensor exhibited change 164.97 pT per mm unit increase, while showed only 0.75 pT/mm same range. Upon repositioning vertically (Y direction), perpendicular vibration, slope increased 196.85 pT, whereas 1.06 for highlight influence environments on demonstrate potential gradiometers mitigate effects. future, plan record signals both inside outside shielded room compare efficacy different designs under

Language: Английский

Citations

1
Cardiac magnetic field map topology quantified by Kullback–Leibler entropy identifies patients with clinically suspected myocarditis DOI Creative Commons

Marius Pille,

A. Gapelyuk,

Karsten Berg

et al.

Frontiers in Cardiovascular Medicine, Journal Year: 2023, Volume and Issue: 10

Published: Nov. 8, 2023

Background Myocarditis is a condition that can have severe adverse outcomes and lead to sudden cardiac death if remaining undetected. This study tested the capability of magnetic field mapping detect patients with clinically suspected myocarditis. could open up way for rapid, non-invasive, cost-effective screening cases before gold standard assessment via endomyocardial biopsy. Methods Historical maps ( n = 97) data from state-of-the-art magnetocardiography device 30) were analyzed using Kullback–Leibler entropy (KLE) dimensionality reduction topological quantification. Linear discriminant analysis was used discern between ongoing myocarditis healthy controls. Results The STT segment magnetocardiogram, i.e., section end S wave T wave, best suited both groups. Using 250-ms excerpt onset gave reliable classification control group historic (sensitivity: 0.83, specificity: 0.85, accuracy: 0.84) recent 0.69, 0.88, 0.80) KLE quantify topology map. Conclusion implementation based on reliably distinguish We implemented an automatized feature selection LDA replace observer-dependent manual thresholding in previous studies.

Language: Английский

Citations

3
Non-Invasive Electroanatomical Mapping: A State-Space Approach for Myocardial Current Density Estimation DOI Creative Commons
Erik Engelhardt, Eric Elzenheimer, Johannes Hoffmann

et al.

Bioengineering, Journal Year: 2023, Volume and Issue: 10(12), P. 1432 - 1432

Published: Dec. 16, 2023

Electroanatomical mapping is a method for creating model of the electrophysiology human heart. Medical professionals routinely locate and ablate site origin cardiac arrhythmias with invasive catheterization. Non-invasive localization takes form electrocardiographic (ECG) or magnetocardiographic (MCG) imaging, where goal to reconstruct electrical activity alternatives catheter electroanatomical would reduce patients' risks open new venues treatment planning prevention. This work introduces system state-based estimating heart from MCG measurements. Our enables arbitrary propagation paths velocities. A Kalman filter optimally estimates current densities under given measurements parameters. In an outer optimization loop, these parameters are then optimized via gradient descent. paper aims establish foundation future research by providing detailed mathematical explanation algorithm. We demonstrate feasibility our through simplified one-layer simulation. results show that algorithm can learn magnetic threshold-based segmentation into healthy pathological tissue yields DICE score 0.84, recall 0.77, precision 0.93.

Language: Английский

Citations

2
National cost savings, operational and safety benefits from use of magnetocardiography in the assessment of emergency department chest pain patients DOI Creative Commons
Christopher W. Baugh,

Margarita E. Pena,

Robert Takla

et al.

American Heart Journal Plus Cardiology Research and Practice, Journal Year: 2024, Volume and Issue: 45, P. 100434 - 100434

Published: Aug. 1, 2024

Patients frequently present to the emergency department (ED) with chest pain requiring further risk stratification. Traditional cardiac diagnostics such as stress testing may expose patients ionizing radiation, not be readily available, take significant time for and interpretation, adds cost workup. Magnetocardiography (MCG) is an alternative approach assess candidates more quickly efficiently than routine downstream testing.

Language: Английский

Citations

0