Clinical magnetocardiography: the unshielded bet—past, present, and future

Frontiers in Cardiovascular Medicine, Год журнала: 2023, Номер 10

Опубликована: Авг. 10, 2023

Magnetocardiography (MCG), which is nowadays 60 years old, has not yet been fully accepted as a clinical tool. Nevertheless, large body of research and several trials have demonstrated its reliability in providing additional diagnostic electrophysiological information if compared with conventional non-invasive electrocardiographic methods. Since the beginning, one major objective difficulty need to clean weak cardiac magnetic signals from much higher environmental noise, especially that urban hospital environments. The obvious solution record magnetocardiogram highly performant magnetically shielded rooms provided ideal setup for decades demonstrating potential this technology. However, only few institutions had resources install run routinely such expensive technically demanding systems. Therefore, increasing attempts made develop cheaper alternatives improve signal-to-noise ratio allowing MCG unshielded In article, most relevant milestones MCG's journey are reviewed, addressing possible reasons beyond currently long-lasting reach breakthrough leveraging authors’ personal experience since early 1980s attempting finally bring patient's bedside many thus far. Their nearly four foundational experimental between solutions summarized referenced, following original vision be intended an unrivaled method contactless assessment electrophysiology advanced electroanatomical imaging, through multimodal integration other non-fluoroscopic imaging techniques. Whereas all above accounts past, available innovative sensors more affordable active shielding technologies, present demonstrates novel systems developed tested multicenter adopting both built-in future will mostly dependent on results ongoing progress sensor technology, relatively soon foreseen provide multiple construction compact, affordable, portable, even wearable devices inside environments perhaps also ambulatory patients.

Язык: Английский

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Modeling and suppression of magnetic noise in nanocrystalline magnetic shielding system considering residual loss magnetic noise and interlayer effects

Measurement, Год журнала: 2025, Номер unknown, С. 117216 - 117216

Опубликована: Март 1, 2025

Язык: Английский

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All-optical dual-axis zero-field atomic magnetometer using light-shift modulation

Physical Review Applied, Год журнала: 2024, Номер 21(1)

Опубликована: Янв. 16, 2024

Functional imaging equipment based on miniaturized atomic magnetometers with array arrangement exhibits promising prospects in biomagnetic scenarios. However, crosstalk from the modulated magnetic field between adjacent sensors degrades accuracy. To address this issue, study proposes an all-optical dual-axis zero-field magnetometer using light-shift modulation. We utilize acousto-optic modulator to modulate a detuned circularly polarized beam for pumping spin ensembles. This allows optical modulation of polarization and meanwhile generates modulation, effectively replacing conventional By probe detect rotation angle perpendicular direction pump beam, we construct configuration longitudinally magnetometer, enabling measurements. Experimental results demonstrate sensitivities 29 15fT/Hz1/2, respectively. method eliminates need coil-based thereby paving way potential applications magnetocardiography magnetoencephalography.Received 3 August 2023Revised 13 November 2023Accepted 4 December 2023DOI:https://doi.org/10.1103/PhysRevApplied.21.014023© 2024 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasMagneto-optical effectMagnetometryOptical pumpingStark effectPhysical SystemsAlkali metalsAtomic gasesTechniquesOptically detected resonancePrecision measurementsAtomic, Molecular & OpticalCondensed Matter, Materials Applied Physics

Язык: Английский

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Analysis and suppression of magnetic field interference for SERF atomic magnetometer

Measurement, Год журнала: 2024, Номер 227, С. 114266 - 114266

Опубликована: Фев. 3, 2024

Язык: Английский

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Efficient magnetic shielding by designing layered composite with nanocrystalline and permalloy for weak magnetic measurement

Sensors and Actuators A Physical, Год журнала: 2024, Номер 375, С. 115538 - 115538

Опубликована: Май 29, 2024

Язык: Английский

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The magnetocardiogram

Biophysics Reviews, Год журнала: 2024, Номер 5(2)

Опубликована: Май 29, 2024

The magnetic field produced by the heart's electrical activity is called magnetocardiogram (MCG). first 20 years of MCG research established most concepts, instrumentation, and computational algorithms in field. Additional insights into fundamental mechanisms biomagnetism were gained studying isolated hearts or even pieces cardiac tissue. Much effort has gone calculating using computer models, including solving inverse problem deducing bioelectric sources from biomagnetic measurements. Recently, magnetocardiographic focused on clinical applications, driven part new technologies to measure weak fields.

Язык: Английский

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Chip‐Scale Optically Pumped Magnetometry Enabled by Tailorable Elliptical Dichroism Metasurface

Advanced Optical Materials, Год журнала: 2024, Номер 12(25)

Опубликована: Июль 22, 2024

Abstract Emerging miniaturized optically pumped magnetometers (OPMs) are becoming one of the most desirable approaches for biomagnetic imaging, especially OPM with elliptically polarized light, which promises single‐light optical pumping and detection high sensitivity. However, conventional schemes this kind require a set bulk polarization optics tedious adjustment procedures, compromise system's compactness practicality. In paper, novel chip‐scale scheme that leverages monolithic elliptical meta‐polarizer is presented experimentally demonstrated. The side length 3 mm laid out on 2 × cm glass wafer. It offers capability to convert arbitrary incident into desired exhibits tailorable dichroism (ED) ≈0.77 at wavelength 795 nm. A 4 vapor cell containing 87 Rb N combined construct OPM. sensitivity sensor reaches approximately 13 fT/Hz 1/2 in four‐layer magnetic shield dynamic range near zero field ≈ ±0.55 nT. By exploiting advantages planar integrated optics, reduced footprints scalability promised. And work paves way integration emerging quantum sensors chip.

Язык: Английский

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Research on the Application of Silver Nanowire-Based Non-Magnetic Transparent Heating Films in SERF Magnetometers

Sensors, Год журнала: 2025, Номер 25(1), С. 234 - 234

Опубликована: Янв. 3, 2025

We propose a non-magnetic transparent heating film based on silver nanowires (Ag-NWs) for application in spin-exchange relaxation-free (SERF) magnetic field measurement devices. To achieve ultra-high sensitivity atomic magnetometers, the atoms within alkali metal vapor cell must be maintained stable and uniform high-temperature environment. Ag-NWs, as conductive material with exceptional electrical conductivity, are well suited this application. By employing high-frequency AC heating, we effectively minimize associated noise. The experimental results demonstrate that proposed film, utilizing surface method, can temperatures exceeding 140 °C, which is sufficient to vaporize atoms. average flux coefficient of 0.1143 nT/mA. Typically, current increases, larger generated. When integrated system discussed paper, characteristic mitigate low-frequency interference. In comparison traditional flexible printed circuits (FPC), Ag-NWs exhibits more temperature distribution. This magnetically leveraging enhances magnetometry presents opportunities use chip-level gyroscopes, clocks, various other

Язык: Английский

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Electronic CPA‐Laser Having Enhanced Sensitivity and Tunability

Advanced Electronic Materials, Год журнала: 2025, Номер unknown

Опубликована: Янв. 15, 2025

Abstract Exceptional point degeneracies, which are spectral singularities of non‐Hermitian systems, have been widely utilized for building optical, mechanical, or electrical sensing systems with much larger responses than those utilizing Hermitian degeneracies. However, such suffer from enhanced noise, negates the response and thus does not provide any improvement in signal‐to‐noise ratio. Recently, coherent perfect absorber (CPA)‐laser, also utilizes singularity, has used resulting better noise robustness responsivity. Nonetheless, CPA‐laser (CPAL) implementation requires all system parameters to be immutable, hinders progress toward their practical use purposes. Here, a tunable electronic is reported that overcomes these obstacles providing ultrahigh sensitivity as validated experiments monitoring arterial pressure respiration. This CPAL scheme inductive coupling between gain loss sub‐components thereby whole can decomposed into an active reader passive sensor, enables tunability performance compared previously systems. Moreover, proposed exhibits exceptional point‐based having similar circuit structure. research paves way exploring applications may profound impact on next‐generation, ultrasensitive electromagnetic system.

Язык: Английский

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Dead‐Zone‐Free NMOR Atomic Magnetometer Based on Excitation of Dual‐Axis Magnetic Pulse

Advanced Quantum Technologies, Год журнала: 2025, Номер unknown

Опубликована: Янв. 17, 2025

Abstract Nonlinear magneto‐optical rotation (NMOR) atomic magnetometer has extreme precision and sensitivity. However, suffers from the problem of dead zone that sensitive signal decays to zero if magnetic field is along some specific directions relative sensor. In this paper, a new scheme based on excitation dual‐axis pulse presented eliminate NMOR magnetometer. The measurement mode free induction decay (FID), which allows pumping detecting stages be separated without interference pulse. model developed for mechanism interaction between optical polarized atoms. To magnetometer, response with established by using density matrix theory bias in arbitrary direction. Then proposed method suppressing examined experiment, agreement model. results show can effectively great significance complex environment variable

Язык: Английский

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