Acquisition of fetal magnetocardiograms in an unshielded hospital setting

A. Brazdeikis; G. J. Vázquez-Flores; I. C. Tan; N. S. Padhye; M. T. Verklan

doi:10.1109/TASC.2007.897308

Acquisition of fetal magnetocardiograms in an unshielded hospital setting

A. Brazdeikis, G. J. Vázquez-Flores, I. C. Tan, N. S. Padhye, M. T. Verklan

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

The acquisition of fetal magnetocardiographic signals in various noisy environments is studied, and improvement in the signal-to-noise ratio (SNR) of weak biomagnetic signals is investigated for various noise levels and gradiometer implementations. There is a consistent improvement in the SNR as fetal gestation age (GA) increases. The SNR in unshielded environment is shown to be acceptable over a wide range of GA values when using the second-order gradiometers with a field balance C_B = 5 × 10^-4 and a gradient balance C_G1 = 5 × 10^-3 or better. It is also shown that the optimal gradiometer baseline length strongly depends on the ambient noise level and the overall gradiometer balance. Shorter (<80 mm) baselines are preferred only when using highly balanced gradiometers in a very high noise environments.

Original language	English (US)
Pages (from-to)	823-826
Number of pages	4
Journal	IEEE Transactions on Applied Superconductivity
Volume	17
Issue number	2
DOIs	https://doi.org/10.1109/TASC.2007.897308
State	Published - Jun 2007
Externally published	Yes

Keywords

Biomagnetic modeling
Biomagnetic signal detection
Fetal magnetocardiography
SQUID magnetometers
Unshielded environment

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1109/TASC.2007.897308

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title = "Acquisition of fetal magnetocardiograms in an unshielded hospital setting",

abstract = "The acquisition of fetal magnetocardiographic signals in various noisy environments is studied, and improvement in the signal-to-noise ratio (SNR) of weak biomagnetic signals is investigated for various noise levels and gradiometer implementations. There is a consistent improvement in the SNR as fetal gestation age (GA) increases. The SNR in unshielded environment is shown to be acceptable over a wide range of GA values when using the second-order gradiometers with a field balance CB = 5 × 10-4 and a gradient balance CG1 = 5 × 10-3 or better. It is also shown that the optimal gradiometer baseline length strongly depends on the ambient noise level and the overall gradiometer balance. Shorter (<80 mm) baselines are preferred only when using highly balanced gradiometers in a very high noise environments.",

keywords = "Biomagnetic modeling, Biomagnetic signal detection, Fetal magnetocardiography, SQUID magnetometers, Unshielded environment",

author = "A. Brazdeikis and V{\'a}zquez-Flores, {G. J.} and Tan, {I. C.} and Padhye, {N. S.} and Verklan, {M. T.}",

note = "Funding Information: Manuscript received August 29, 2006. This work was supported by the State of Texas via Texas Center for Superconductivity at the University of Houston (TcSUH). A. Brazdeikis, G. J. V{\'a}zquez-Flores, and I. C. Tan are with the Texas Center for Superconductivity at the University of Houston (TcSUH), Houston, TX 77204 USA (e-mail: audrius@uh.edu). N. S. Padhye and M. T. Verklan are with the University of Texas Health Science Center at Houston, Houston, TX 77030 USA. Color versions of one or more of the figures in this paper are available online at http://ieeexplore.ieee.org. Digital Object Identifier 10.1109/TASC.2007.897308",

year = "2007",

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doi = "10.1109/TASC.2007.897308",

language = "English (US)",

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AU - Vázquez-Flores, G. J.

AU - Tan, I. C.

AU - Padhye, N. S.

AU - Verklan, M. T.

N1 - Funding Information: Manuscript received August 29, 2006. This work was supported by the State of Texas via Texas Center for Superconductivity at the University of Houston (TcSUH). A. Brazdeikis, G. J. Vázquez-Flores, and I. C. Tan are with the Texas Center for Superconductivity at the University of Houston (TcSUH), Houston, TX 77204 USA (e-mail: audrius@uh.edu). N. S. Padhye and M. T. Verklan are with the University of Texas Health Science Center at Houston, Houston, TX 77030 USA. Color versions of one or more of the figures in this paper are available online at http://ieeexplore.ieee.org. Digital Object Identifier 10.1109/TASC.2007.897308

PY - 2007/6

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N2 - The acquisition of fetal magnetocardiographic signals in various noisy environments is studied, and improvement in the signal-to-noise ratio (SNR) of weak biomagnetic signals is investigated for various noise levels and gradiometer implementations. There is a consistent improvement in the SNR as fetal gestation age (GA) increases. The SNR in unshielded environment is shown to be acceptable over a wide range of GA values when using the second-order gradiometers with a field balance CB = 5 × 10-4 and a gradient balance CG1 = 5 × 10-3 or better. It is also shown that the optimal gradiometer baseline length strongly depends on the ambient noise level and the overall gradiometer balance. Shorter (<80 mm) baselines are preferred only when using highly balanced gradiometers in a very high noise environments.

AB - The acquisition of fetal magnetocardiographic signals in various noisy environments is studied, and improvement in the signal-to-noise ratio (SNR) of weak biomagnetic signals is investigated for various noise levels and gradiometer implementations. There is a consistent improvement in the SNR as fetal gestation age (GA) increases. The SNR in unshielded environment is shown to be acceptable over a wide range of GA values when using the second-order gradiometers with a field balance CB = 5 × 10-4 and a gradient balance CG1 = 5 × 10-3 or better. It is also shown that the optimal gradiometer baseline length strongly depends on the ambient noise level and the overall gradiometer balance. Shorter (<80 mm) baselines are preferred only when using highly balanced gradiometers in a very high noise environments.

KW - Biomagnetic modeling

KW - Biomagnetic signal detection

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KW - SQUID magnetometers

KW - Unshielded environment

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Acquisition of fetal magnetocardiograms in an unshielded hospital setting

Abstract

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