Integrated AQUID-gradiometer system for magneto-cardiography without magnetic shielding

Stolz, R.; Zakosarenko, V.; Bondarenko, N. F.; Schulz, M.; Fritzsch, L.; Oukhanski, N.; Meyer, H.‐G.

doi:10.1109/tasc.2003.813852

Cited by 11 publications

(4 citation statements)

References 2 publications

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“…2 is given an example. The raw signal G 12 obtained from a patient in the 36 th week of gestation, acquired before the application of the filtering procedure described in [4], is represented in Fig. 2a) in black, the estimation of the baseline drift being represented in red on the same figure.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…The sensitive superconducting quantum interference device (SQUID) first-order gradiometers, used at the detection of biomagnetic fields of the human heart, have been manufactured in standard all-refractory Nb/AlO x /Nb technology [4]. The acquisition system comprises the SQUID sensor and the analysis software.…”

Section: Equipment and Data Acquisition Systemmentioning

confidence: 99%

“…The procedure is also applied to the reference magnetometer signals. To the resulting signals is applied a FFT to reduce the acquisition noise [4]. After filtering, the complex valued Fourier spectrum is transformed back into the time space.…”

Section: Equipment and Data Acquisition Systemmentioning

confidence: 99%

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A wavelet based baseline drift correction method for fetal magnetocardiograms

Arvinti-Costache

Costache

Naforniţa

et al. 2011

2011 IEEE 9th International New Circuits and Systems Conference

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The paper aims at the development of a method for the removal of baseline drift of fetal magnetocardiograms. The described method is based on wavelet analysis and uses the Stationary Wavelet Transform (SWT). The performance of the method is ensured through the appropriate preselection of two parameters: the mother wavelet used for the computation of the SWT and the number of decomposition levels, selected in accordance to the sampling frequency of the magnetocardiogram (MCG). The method is robust and can be used in an automatic processing system.

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Section: Simulation Resultsmentioning

confidence: 99%

Section: Equipment and Data Acquisition Systemmentioning

confidence: 99%

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A wavelet based baseline drift correction method for fetal magnetocardiograms

Arvinti-Costache

Costache

Naforniţa

et al. 2011

2011 IEEE 9th International New Circuits and Systems Conference

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“…Three orthogonal SQUID magnetometers were used to enhance the CMR of the gradiometers further. Detailed description of the system is given in [3].…”

Section: The Set-up Of the Multi-channel Systemmentioning

confidence: 99%

Integrated gradiometer-SQUID system for fetal magneto-cardiography without magnetic shielding

Stolz¹,

Bondarenko²,

Zakosarenko³

et al. 2003

Supercond. Sci. Technol.

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First-order integrated planar SQUID gradiometers fabricated on the basis of the Nb/AlOX/Nb technology have pick-up loops with dimensions of 2 cm × 2 cm and a baseline of 4 cm. Their intrinsic noise corresponding to a field resolution in one loop is better than 3 fT Hz−1/2 and balance better than >104. Two of the gradiometers were used for measurements of a fetal heart signal. The third one was placed over the first two as a reference to build second-order gradiometers electronically. In addition, three SQUID magnetometers arranged orthogonally to each other were used to improve the disturbance suppression. The system shows stable operation in the laboratory without magnetic shielding. The SQUID signals were digitized using a 16-bit ADC and digitally filtered. A post-processing filter algorithm for enhancing the signal-to-noise ratio is discussed. A fetal cardiogram could be recorded in real time with a signal-to-noise ratio better than 2 for a test person in the 36th week of pregnancy.

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Prenatal diagnosis of a long QT syndrome by fetal magnetocardiography in an unshielded bedside environment

et al. 2005

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Bedside fetal magnetocardiography revealed the exact diagnosis of the long QT syndrome in a period of the gestation when the fetus was electrically isolated by the vernix caseosa that hinders electrocardiography. To patients at risk of fetal cardiac abnormalities, magnetocardiography can be offered as a non-invasive diagnostic bedside procedure. The diagnosis should trigger closer surveillance and delivery in a perinatal center.

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Integrated AQUID-gradiometer system for magneto-cardiography without magnetic shielding

Cited by 11 publications

References 2 publications

A wavelet based baseline drift correction method for fetal magnetocardiograms

A wavelet based baseline drift correction method for fetal magnetocardiograms

Integrated gradiometer-SQUID system for fetal magneto-cardiography without magnetic shielding

Prenatal diagnosis of a long QT syndrome by fetal magnetocardiography in an unshielded bedside environment

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