Pith. sign in

REVIEW 1 major objections 1 minor 41 references

A Signal Analysis Framework for Unshielded Room-Temperature Magnetocardiography

T0 review · 1 major / 1 minor · reviewed 2026-06-30 · grok-4.3

Challenge this review Re-run · record.json Download PDF Read on arXiv ↗ Review JSON

Pith's one-line read An OPM gradiometer with WMSPCA filtering records cardiac magnetic fields in unshielded rooms at 28.5 dB SNR.

desk verdict The paper reports concrete OPM gradiometer numbers in ambient conditions and a WMSPCA pipeline, but the abstract supplies no checks that the final traces are cardiac fields rather than residual noise or artifacts. read the letter →

arxiv 2606.29285 v1 pith:A7TSSLYB submitted 2026-06-28 cond-mat.stat-mech

Kushal Patel , Kesavaraja C , Pranab Dutta , Korak Biswas This is my paper · ORCID
classification cond-mat.stat-mech
keywords magnetocardiographyopticallypumpedmagnetometersunshieldedrecordingroom-temperatureMCGgradiometerconfigurationWMSPCAfilteringcardiacmagneticfieldssignalqualityestimation
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

The paper establishes that room-temperature magnetocardiography is feasible in ordinary magnetic environments by using optically pumped magnetometers in a gradiometer arrangement. Sequential recordings at 16 thoracic sites, processed through wavelet multiscale principal component analysis, produce clear QRS and T-wave shapes with an average signal-to-noise ratio of 28.56 dB. A sympathetic reader would care because this removes the requirement for expensive shielded rooms that have confined MCG to specialized facilities. The work therefore points toward broader clinical access for magnetic heart mapping.

What carries the argument

Gradiometer configuration of optically pumped magnetometers paired with wavelet multiscale principal component analysis filtering to suppress ambient noise while retaining cardiac field morphology.

What would settle it

A side-by-side comparison in which the unshielded waveforms fail to match timing and shape of simultaneous ECG traces or shielded MCG recordings at the same sites would show the signals are not cardiac fields.

Watch

Extended reading notes

Core claim

The OPM-based system in gradiometer configuration delivers a common-mode rejection ratio of 31 dB and gradient sensitivity of 314 fT/cm/sqrt(Hz). After WMSPCA filtering and signal quality estimation, the QRS complex reaches an SNR of 28.56 ± 5.61 dB across all 16 locations while preserving morphological fidelity in both QRS and T-wave segments, demonstrating that clinical-grade signals can be obtained without shielding.

Load-bearing premise

The filtered signals at the 16 thoracic locations represent genuine cardiac magnetic fields rather than residual environmental noise or processing artifacts.

Editorial extensions

If this is right

  • Cardiac magnetic signals become acquirable in ambient conditions without active or passive shielding.
  • Consistent morphological fidelity holds across QRS complex and T-wave at all 16 measurement locations.
  • The approach supports sequential multi-site mapping suitable for hospital and point-of-care use.
  • Gradient sensitivity of 314 fT/cm/sqrt(Hz) combined with 31 dB rejection enables usable recordings in real-world settings.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • If the signals are cardiac, the same processing chain could support source localization of heart currents without a shielded enclosure.
  • The framework lowers the infrastructure barrier enough that routine MCG might eventually run alongside standard ECG in ordinary clinics.
  • Faster acquisition hardware would be a direct next step to enable real-time rather than sequential mapping.
Share X Bluesky LinkedIn Reddit HN

Signed reviews

No signed human review yet.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit.

Referee Report

1 major / 1 minor

Summary. The manuscript presents an OPM-based magnetocardiography system designed for unshielded, room-temperature operation in a gradiometer configuration. It reports a common-mode rejection ratio of 31 dB and gradient sensitivity of 314 fT/cm/√Hz, with sequential recordings at 16 anterior thoracic locations processed by wavelet multiscale principal component analysis (WMSPCA) filtering and signal quality estimation, yielding a QRS SNR of 28.56 ± 5.61 dB and claiming consistent morphological fidelity sufficient to demonstrate feasibility of clinical-grade unshielded MCG.

Significance. If the post-processed traces can be independently confirmed as cardiac magnetic fields, the reported sensitivity and SNR values would constitute a meaningful experimental step toward practical MCG deployment in ordinary clinical environments without magnetic shielding.

major comments (1)
  1. [Abstract] Abstract (final paragraph): The feasibility claim that the 16 sequentially acquired traces exhibit 'consistent morphological fidelity across the QRS complex and T-wave segments' is load-bearing for the central result, yet the manuscript supplies no simultaneous ECG reference, no shielded-MCG cross-check, and no quantitative test (e.g., dipole-field consistency or timing correlation) to establish that the reported 28.56 dB QRS SNR reflects genuine cardiac sources rather than residual environmental fields or WMSPCA-induced transients after the 31 dB CMRR subtraction.
minor comments (1)
  1. [Abstract] The sensitivity is given as 314 fT/cm/√Hz; the notation should be rendered consistently as fT cm^{-1} Hz^{-1/2} throughout the text and figures.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the detailed review and constructive criticism. The central concern is the strength of evidence supporting that the recorded signals originate from cardiac sources rather than residual noise. We address this point directly below and propose textual revisions to qualify our claims accordingly.

read point-by-point responses

  1. Referee: [Abstract] Abstract (final paragraph): The feasibility claim that the 16 sequentially acquired traces exhibit 'consistent morphological fidelity across the QRS complex and T-wave segments' is load-bearing for the central result, yet the manuscript supplies no simultaneous ECG reference, no shielded-MCG cross-check, and no quantitative test (e.g., dipole-field consistency or timing correlation) to establish that the reported 28.56 dB QRS SNR reflects genuine cardiac sources rather than residual environmental fields or WMSPCA-induced transients after the 31 dB CMRR subtraction.

    Authors: We agree that the manuscript does not include simultaneous ECG, shielded-MCG comparison, or explicit quantitative tests such as dipole fitting or cross-correlation with reference timing. The current validation rests on (i) the 31 dB CMRR of the gradiometer configuration, (ii) the multi-location consistency of QRS and T-wave timing and polarity expected for anterior thoracic recordings, and (iii) the SQE scoring that penalizes non-cardiac morphologies. These elements support the reported SNR but do not constitute independent confirmation of cardiac origin. To address the concern, we will revise the abstract and discussion to remove the unqualified 'clinical-grade' feasibility statement, explicitly note the absence of reference-channel validation, and add a limitations paragraph describing the reliance on morphological consistency alone. No new experimental data can be added at this stage. revision: yes

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity; experimental results are direct measurements

full rationale

The paper reports experimental MCG recordings using OPM gradiometers in unshielded environments, followed by WMSPCA filtering and SNR calculations on the acquired traces. No derivation chain, fitted parameters, or predictions are present that reduce to the paper's own inputs by construction. All reported quantities (CMRR 31 dB, gradient sensitivity, QRS SNR 28.56 dB) are direct experimental outcomes rather than quantities derived from self-referential equations or self-citation load-bearing premises. The feasibility claim rests on observed signal morphology, not on any internal mathematical reduction.

Assumptions & free parameters 0 free parameters · 1 assumptions · 0 invented entities

Abstract-only review yields minimal ledger entries; the central claim rests on the unstated premise that gradiometer subtraction plus WMSPCA removes all non-cardiac contributions without distorting the cardiac waveform.

assumptions (1)
  • domain assumption OPM gradiometer configuration achieves sufficient common-mode rejection in ambient fields to isolate cardiac signals
    Invoked by the system design and CMRR claim in the abstract.

how reviews work

0 comments
Cite this review

Pith. "Pith review of A Signal Analysis Framework for Unshielded Room-Temperature Magnetocardiography." pith.science (2026). https://pith.science/paper/A7TSSLYB

@misc{pith2026260629285,
  author       = {Pith},
  title        = {Pith review of: A Signal Analysis Framework for Unshielded Room-Temperature Magnetocardiography},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/A7TSSLYB}},
  note         = {Machine review of arXiv:2606.29285}
}
abstract

Room-temperature, unshielded recording of cardiac magnetic signals has remained a significant challenge since the inception of magnetocardiography (MCG). In this work, we present an MCG system based on optically pumped magnetometers (OPMs) designed to operate in ambient magnetic environments and acquire adult human cardiac magnetic fields, without the need for active or passive shielding. The system operates in a gradiometer configuration, achieving background-noise cancellation with a common-mode rejection ratio (CMRR) of 31 dB and a gradient sensitivity of 314 $\mathrm{fT/cm/\sqrt{Hz}}$. MCG signals were acquired sequentially at 16 locations across the anterior thorax, and a comprehensive signal-analysis framework incorporating wavelet multiscale principal component analysis (WMSPCA) filtering and signal quality estimation (SQE) scoring was developed to enhance signal quality. This framework yielded a QRS complex signal-to-noise ratio (SNR) of $28.56 \pm 5.61$ dB across all measurement locations. These results demonstrate the feasibility of performing clinical-grade MCG in unshielded, real-world magnetic environments, with consistent morphological fidelity across the QRS complex and T-wave segments. This work represents a meaningful step toward the practical deployment of OPM-based MCG systems in hospital and point-of-care settings.

Figures

Figures reproduced from arXiv: 2606.29285 by the authors.

Figure 1
Figure 1. FIG. 1: (a) Measurement grid marked with respect to anatomical landmarks with an intersensor spacing of 5 cm. [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. FIG. 2 [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. FIG. 3: a. Amplitude spectral densities (ASDs) of Magnetometer 1 and Magnetometer 2 across different frequencies, [PITH_FULL_IMAGE:figures/full_fig_p006_3.png] view at source ↗
Figures from the paper (5 more)
Figure 4
Figure 4. Figure 4: FIG. 4: Measured MCG signals plotted along with simultaneously recorded ECG signals. The R-peak instances [PITH_FULL_IMAGE:figures/full_fig_p006_4.png]
Figure 5
Figure 5. Figure 5: FIG. 5: Raw MCG signals processed using the proposed signal processing framework to improve the SNR of the [PITH_FULL_IMAGE:figures/full_fig_p007_5.png]
Figure 6
Figure 6. Figure 6: FIG. 6: (a) Signal-averaged beat obtained after the complete denoising process for all the sensor channels (Butterfly [PITH_FULL_IMAGE:figures/full_fig_p008_6.png]
Figure 7
Figure 7. Figure 7: FIG. 7: QRS SNR values computed for denoised and averaged signals at each measurement location, compared with [PITH_FULL_IMAGE:figures/full_fig_p008_7.png]
Figure 8
Figure 8. Figure 8: FIG. 8: Comparison of MFMs with current density arrows indicating the direction of the cardiac current flow [PITH_FULL_IMAGE:figures/full_fig_p010_8.png]

Discussion (0). Continue with ORCID to comment.

Reference graph

Works this paper leans on

41 extracted references · 18 canonical work pages

  1. [1]

    Malmivuo \ and\ author R

    author author J. Malmivuo \ and\ author R. Plonsey ,\ @noop title Bioelectromagnetism: Principles and Applications of Bioelectric and Biomagnetic Fields \ ( publisher Oxford University Press ,\ address New York ,\ year 1995 ) NoStop

    1995

  2. [2]

    author author B. J. \ Roth ,\ title title Biomagnetism: The first sixty years , \ https://doi.org/10.3390/s23094218 journal journal Sensors \ volume 23 ,\ pages 4218 ( year 2023 ) NoStop

    work page doi:10.3390/s23094218 2023

  3. [3]

    Fenici , author D

    author author R. Fenici , author D. Brisinda ,\ and\ author A. M. \ Meloni ,\ title title Clinical application of magnetocardiography , \ https://doi.org/10.1586/14737159.5.3.291 journal journal Expert Review of Molecular Diagnostics \ volume 5 ,\ pages 291--313 ( year 2005 ) NoStop

    work page doi:10.1586/14737159.5.3.291 2005

  4. [4]

    Chen , author L

    author author X. Chen , author L. Li , author X. Xu , author L. Xia , author C. Liu , author C. Shen ,\ and\ author Y. Luo ,\ title title New clinical application of magnetocardiography: diagnosis of left ventricular hypertrophy , \ https://doi.org/10.3389/fcvm.2025.1577662 journal journal Frontiers in Cardiovascular Medicine \ volume Volume 12 - 2025 ( y...

    work page doi:10.3389/fcvm.2025.1577662 2025

  5. [5]

    Yamada \ and\ author I

    author author S. Yamada \ and\ author I. Yamaguchi ,\ title title Magnetocardiograms in clinical medicine: Unique information on cardiac ischemia, arrhythmias, and fetal diagnosis , \ https://doi.org/10.2169/internalmedicine.44.1 journal journal Internal Medicine \ volume 44 ,\ pages 1--19 ( year 2005 ) NoStop

    work page doi:10.2169/internalmedicine.44.1 2005

  6. [6]

    Stark , author C

    author author B. Stark , author C. Johnson ,\ and\ author G. A. \ Roth ,\ title title Global prevalence of coronary artery disease: an update from the global burden of disease study , \ @noop journal journal Journal of the American College of Cardiology \ volume 83 ,\ pages 2320--2320 ( year 2024 ) NoStop

    2024

  7. [7]

    \ Her , author D

    author author A.-Y. \ Her , author D. Dischl , author Y. H. \ Kim , author S.-W. \ Kim ,\ and\ author E.-S. \ Shin ,\ title title Magnetocardiography for the detection of myocardial ischemia , \ https://doi.org/10.3389/fcvm.2023.1242215 journal journal Frontiers in Cardiovascular Medicine \ volume 10 ,\ pages 1242215 ( year 2023 ) NoStop

    work page doi:10.3389/fcvm.2023.1242215 2023

  8. [8]

    Li , author M

    author author J. Li , author M. Yan , author M. Xiang ,\ and\ author X. Ning ,\ title title Meta-analysis of magnetocardiography in diagnosing coronary artery disease and myocardial ischemia , \ @noop journal journal Next Research \ ,\ pages 101496 ( year 2026 ) NoStop

    2026

Show all 41 references
  1. [9]

    author author S. E. \ Mace , author M. Pena , author D. J. \ Ahee ,\ and\ author R. Takla ,\ title title Utility of rest magnetocardiography in patients presenting to the emergency department with chest pain: A case series on the cardioflux mcg , \ https://doi.org/https://doi....

    2024 doi

  2. [10]

    Clarke \ and\ editor A

    editor J. Clarke \ and\ editor A. I. \ Braginski ,\ eds.,\ @noop title The SQUID Handbook: Applications of SQUIDs and SQUID Systems \ ( publisher John Wiley & Sons ,\ year 2006 ) NoStop

    2006

  3. [11]

    Sternickel \ and\ author A

    author author K. Sternickel \ and\ author A. I. \ Braginski ,\ title title Biomagnetism using squids: Status and perspectives , \ https://doi.org/10.1088/0953-2048/19/3/024 journal journal Superconductor Science and Technology \ volume 19 ,\ pages S160--S171 ( year 2006 ) NoStop

    doi

  4. [12]

    Omar , author M

    author author M. Omar , author M. Benke , author S. Zhang , author J. Zhang , author M. Kuebler , author P. Sharbati , author A. Rahimpour , author A. Gueck , author M. Kapitonova , author D. Kadam , et al. ,\ title title Human cardiac measurements with diamond magnetometers ,...

    2026

  5. [13]

    Yaga , author M

    author author L. Yaga , author M. Amemiya , author Y. Natsume , author T. Shibuya ,\ and\ author T. Sasano ,\ title title Recording of cardiac excitation using a novel magnetocardiography system with magnetoresistive sensors outside a magnetic shielded room , \ https://doi.org...

    2025 doi

  6. [14]

    Jano s ek , author M

    author author M. Jano s ek , author M. Butta , author M. Dressler , author E. Saunderson , author D. Novotny ,\ and\ author C. Fourie ,\ title title 1-pt noise fluxgate magnetometer for geomagnetic measurements and unshielded magnetocardiography , \ https://doi.org/10.1109/TIM...

    2019 doi

  7. [15]

    author author J. W. \ Mooney , author S. Ghasemi-Roudsari , author E. R. \ Banham , author C. Symonds , author N. Pawlowski ,\ and\ author B. T. H. \ Varcoe ,\ title title A portable diagnostic device for cardiac magnetic field mapping , \ @noop journal journal Biomedical Phys...

    2017

  8. [16]

    Xing , author H

    author author Z. Xing , author H. Li , author H. Dou , author Z. Zheng , author J. Dai , author C. Wang , author J. Cui , author X. Zhang ,\ and\ author T. Jiang ,\ title title Multi-level gated u-net for denoising tmr sensor-based mcg signals , \ in\ https://doi.org/10.1007/9...

    2025 doi

  9. [17]

    Yang , author M

    author author Y. Yang , author M. Xu , author A. Liang , author Y. Yin , author X. Ma , author Y. Gao ,\ and\ author X. Ning ,\ title title A new wearable multichannel magnetocardiogram system with a serf atomic magnetometer array , \ https://doi.org/10.1038/s41598-021-84971-7...

    2021 doi

  10. [18]

    author author M. E. \ Pena , author C. L. \ Pearson , author M. P. \ Goulet , author V. M. \ Kazan , author A. L. \ DeRita , author S. M. \ Szpunar ,\ and\ author R. B. \ Dunne ,\ title title A 90-second magnetocardiogram using a novel analysis system to assess for coronary ar...

    2019 doi

  11. [19]

    author author G. Z. \ Iwata , author C. T. \ Nguyen , author K. Tharratt , author M. Ruf , author T. Reinhardt , author J. Crivelli-Decker , author M. S. \ Liddy , author A. E. \ Rugar , author F. Lu , author K. Aschbacher ,\ and\ author E. J. \ Pratt ,\ title title Bedside ma...

    2024 doi

  12. [20]

    Xiao , author C

    author author W. Xiao , author C. Sun , author L. Shen , author Y. Feng , author M. Liu , author Y. Wu , author X. Liu , author T. Wu , author X. Peng ,\ and\ author H. Guo ,\ title title A movable unshielded magnetocardiography system , \ https://doi.org/10.1126/sciadv.adg174...

    2023 doi

  13. [21]

    author author M. E. \ Limes , author E. L. \ Foley , author T. W. \ Kornack , author S. Caliga , author S. McBride , author A. Braun , author W. Lee , author V. G. \ Lucivero ,\ and\ author M. V. \ Romalis ,\ title title Portable magnetometry for detection of biomagnetism in a...

    2020 doi

  14. [22]

    Patel , author K

    author author K. Patel , author K. C , author P. Dutta ,\ and\ author K. Biswas ,\ https://doi.org/10.48550/arXiv.2602.14264 title Magnetocardiography measurements using an optically pumped magnetometer under ambient conditions , \ ( year 2026 ),\ https://arxiv.org/abs/2602.14...

    2026 doi

  15. [23]

    Lu , author K

    author author L. Lu , author K. Yang , author X. Kong , author R. Yang ,\ and\ author Y. Wang ,\ title title A real-time, automatic mcg signal quality evaluation method using magnetocardiography and electrocardiography , \ @noop journal journal IEEE Transactions on Applied Sup...

    2018

  16. [24]

    Jia , author H

    author author Y. Jia , author H. Pei , author Y. Zhou , author J. Liang , author Y. Cui , author J. Pang , author C. Shen ,\ and\ author M. Xiang ,\ title title A novel interpretable and real-time framework for multichannel mcg signal quality assessment , \ @noop journal journ...

    2025

  17. [25]

    Zhang , author Y

    author author S. Zhang , author Y. Wang , author H. Wang , author S. Jiang ,\ and\ author X. Xie ,\ title title Quantitative evaluation of signal integrity for magnetocardiography , \ @noop journal journal Physics in Medicine & Biology \ volume 54 ,\ pages 4793--4802 ( year 20...

    2009

  18. [26]

    Zhu , author X

    author author C. Zhu , author X. Zhang , author M. Xiang , author C. Qu , author Y. Jia , author J. Yang , author K. Tian , author Y. Cao , author J. Pang ,\ and\ author J. Li ,\ title title Multi-channel non-local means algorithm based on hermite approximation for denoising t...

    2025

  19. [27]

    Mariyappa , author S

    author author N. Mariyappa , author S. Sengottuvel , author R. Patel , author C. Parasakthi , author K. Gireesan , author M. P. \ Janawadkar , author T. S. \ Radhakrishnan ,\ and\ author C. S. \ Sundar ,\ title title Denoising of multichannel mcg data by the combination of eem...

    2015

  20. [28]

    Pan \ and\ author W

    author author J. Pan \ and\ author W. J. \ Tompkins ,\ title title A real-time qrs detection algorithm , \ @noop journal journal IEEE Transactions on Biomedical Engineering \ volume 32 ,\ pages 230--236 ( year 1985 ) NoStop

    1985

  21. [29]

    author author B. R. \ Bakshi ,\ title title Multiscale pca with application to multivariate statistical process monitoring , \ @noop journal journal AIChE Journal \ volume 44 ,\ pages 1596--1610 ( year 1998 ) NoStop

    1998

  22. [30]

    author author H. K. \ Lim , author H. Kwon , author N. Chung , author Y. G. \ Ko , author J. M. \ Kim , author I. S. \ Kim ,\ and\ author Y. K. \ Park ,\ title title Usefulness of magnetocardiogram to detect unstable angina pectoris and non-st elevation myocardial infarction ,...

    2009

  23. [31]

    Kandori , author K

    author author A. Kandori , author K. Tsukada , author Y. Haruta , author Y. Noda , author Y. Terada , author T. Mitsui ,\ and\ author K. Sekihara ,\ title title Reconstruction of two-dimensional current distribution from tangential mcg measurement , \ @noop journal journal Phy...

    1996

  24. [32]

    Haberkorn , author U

    author author W. Haberkorn , author U. Steinhoff , author M. Burghoff , author O. Kosch , author A. Morguet ,\ and\ author H. Koch ,\ title title Pseudo current density maps of electrophysiological heart, nerve or brain function and their physical basis , \ @noop journal journ...

    2006

  25. [33]

    Tao , author S

    author author R. Tao , author S. Zhang , author R. Zhang , author C. Shen , author J. Ma , author J. Cui , author Y. Chen , author B. Wang , author H. Li , author X. Xie ,\ and\ author G. Zheng ,\ title title Ai-enabled diagnosis and localization of myocardial ischemia and cor...

    2025

  26. [34]

    Zhao , author S

    author author C. Zhao , author S. Jiang , author Y. Wu , author J. Zhu , author D. Zhou , author B. Hailer , author D. Gr \"o nemeyer ,\ and\ author P. Van Leeuwen ,\ title title An integrated maximum current density approach for noninvasive detection of myocardial infarction ...

    2018

  27. [35]

    Su , author Z

    author author S. Su , author Z. Xu , author X. He , author G. Zhang , author H. Wu , author Y. Gao , author Y. Ma , author C. Yin , author Y. Ruan , author K. Li ,\ and\ author Q. Lin ,\ title title Vector magnetocardiography using compact optically-pumped magnetometers , \ @n...

    2024

  28. [36]

    Zhu ,\ https://doi.org/10.21227/qkpa-bc19 title Mcg dataset , \ howpublished IEEE DataPort ( year 2024 ) NoStop

    author author C. Zhu ,\ https://doi.org/10.21227/qkpa-bc19 title Mcg dataset , \ howpublished IEEE DataPort ( year 2024 ) NoStop

    2024 doi

  29. [37]

    Drung \ and\ author H

    author author D. Drung \ and\ author H. Koch ,\ title title An electronic second-order gradiometer for biomagnetic applications in clinical shielded rooms , \ @noop journal journal IEEE Transactions on Applied Superconductivity \ volume 3 ,\ pages 2594--2597 ( year 2002 ) NoStop

    2002

  30. [38]

    author author Y. H. \ Lee , author J. M. \ Kim , author K. K. \ Yu , author K. Kim , author H. Kwon , author I. S. \ Kim ,\ and\ author Y. K. \ Park ,\ title title 64-channel second-order planar gradiometer system for magnetocardiograms , \ @noop journal journal IEEE Transacti...

    2007

  31. [39]

    Zhang , author R

    author author R. Zhang , author R. Mhaskar , author K. Smith ,\ and\ author M. Prouty ,\ title title Portable intrinsic gradiometer for ultra-sensitive detection of magnetic gradient in unshielded environment , \ @noop journal journal Applied Physics Letters \ volume 116 ( yea...

    2020

  32. [40]

    M \"a ntynen , author M

    author author V. M \"a ntynen , author M. Lehto , author H. Parikka ,\ and\ author J. Montonen ,\ title title Noninvasive mapping reveals recurrent and suddenly changing patterns in atrial fibrillation---a magnetocardiographic study , \ @noop journal journal Physiological Meas...

    2018

  33. [41]

    Aita , author K

    author author S. Aita , author K. Ogata , author K. Yoshida , author T. Inaba , author H. Kosuge , author T. Machino , author Y. Tsumagari , author A. Hattori , author Y. Ito , author Y. Komatsu ,\ and\ author K. Sekihara ,\ title title Noninvasive mapping of premature ventric...

    2019

Pith tools

Reviewed June 30, 2026 · model on record in the stance chip above.