Nonlinear noise reduction using reference data

Sternickel, Karsten; Effern, A.; Lehnertz, Klaus; Schreiber, Thomas; David, Peter

doi:10.1103/physreve.63.036209

Cited by 15 publications

(11 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This coloured noise could be removed by the aplication of more advanced DSP techniques such as wavelet denoising [45], reference data based non-linear denoising as an alternative improvement to gradiometry [46], and EEMD for baseline wander removal [47]. A second layer of coils ontop could provide an improvement to gradiometer performance as the second coils would be coaxial with the first but receive reduced cardiac magnetic flux [48].…”

Section: First Mcg Measurementsmentioning

confidence: 99%

A portable diagnostic device for cardiac magnetic field mapping

Mooney

Ghasemi-Roudsari

Banham

et al. 2017

Biomed. Phys. Eng. Express

View full text Add to dashboard Cite

In this paper we present a portable magnetocardiography device. The focus of this development was delivering a rapid assessment of chest pain in an emergency department. The aim was therefore to produce an inexpensive device that could be rapidly deployed in a noisy unshielded ward environment. We found that induction coil magnetometers with a coil design optimized for magnetic field mapping possess sufficient sensitivity (104f T / √ Hz noise floor at 10Hz) and response (813f T /µV at 10Hz) for cycle averaged magnetocardiography and are able to measure depolarisation signals in an unshielded environment. We were unable to observe repolarisation signals to a reasonable fidelity. We present the design of the induction coil sensor array and signal processing routine along with data demonstrating performance in a hospital environment.

show abstract

Section: First Mcg Measurementsmentioning

confidence: 99%

A portable diagnostic device for cardiac magnetic field mapping

Mooney

Ghasemi-Roudsari

Banham

et al. 2017

Biomed. Phys. Eng. Express

View full text Add to dashboard Cite

show abstract

“…4b) presents the major features of the human magnetocardiogram. After state-of-the-art filtering based on the noise extraction in state space [15] finer features can be resolved (Fig. 4c).…”

Section: Mumetalmentioning

confidence: 99%

“…The work described here was supported by Deutsche Forschungsgemeinschaft, Schweizerischer Nationalfonds, The same data filtered using state-of-the-art signal recovery techniques based on the noise extraction in state space [15]. data filtered using state-of-the-art signal recovery techniques based on the noise extraction in state space [15].…”

Section: Acknowledgmentsmentioning

confidence: 99%

See 1 more Smart Citation

Laser-pumped cesium magnetometers for high-resolution medical and fundamental research

Groeger

Bison

Knowles

et al. 2006

Sensors and Actuators A: Physical

View full text Add to dashboard Cite

Laser-pumped cesium magnetometers allow highly sensitive magnetometry at room temperature. We report on applications of that technique in biomagnetic diagnostics and in a neutron electric dipole moment (nEDM) experiment. In the biomagnetic application the magnetic field from the beating human heart is detected using a gradiometer which reaches an intrinsic sensitivity of 80 fT/Hz 1/2 . The device can record time-resolved magnetic field maps above the human body surface with a spatial resolution of 4 cm and its performance is comparable to commercial devices based on the SQUID technique. In the nEDM experiment laser-pumped cesium magnetometers are used to measure and stabilize a DC magnetic field at a level of 10 -7. Those devices reach an intrinsic sensitivity of about 14 fT/Hz 1/2 with a measurement bandwidth of 1 kHz. The general principle of operation and specific results are presented.

show abstract

“…5b) allows one to identify the major features of the human magnetocardiogram. After state-of-the-art filtering [11] even the finer features can be resolved (Fig. 5c).…”

Section: Article In Pressmentioning

confidence: 99%

Laser-based precision magnetometry in fundamental and applied research

Weis

Wynands

2005

Optics and Lasers in Engineering

View full text Add to dashboard Cite

In this paper we review research done by the recently founded Fribourg group for Atomic Physics (FRAP) using laser-assisted spin coherence spectroscopy of atomic samples in applied and fundamental physics. Spin coherence in optically pumped ensembles of paramagnetic atoms may be extremely long-lived when the samples are well shielded from external perturbations, like static or oscillating magnetic fields and field gradients, static electric fields, or crystalline field gradients. Conversely, such interactions may be studied with high sensitivity and precision when the decoherence that they produce is measured by optical means. We report on applications of this technique covering optical magnetometry for biomagnetic diagnostics, investigations of atomic impurities in quantum crystals, measurements of forbidden tensor polarizabilities and electric dipole moments, and the space-time resolved study of the diffusion of gas-phase atoms.

show abstract

Nonlinear noise reduction using reference data

Cited by 15 publications

References 13 publications

A portable diagnostic device for cardiac magnetic field mapping

A portable diagnostic device for cardiac magnetic field mapping

Laser-pumped cesium magnetometers for high-resolution medical and fundamental research

Laser-based precision magnetometry in fundamental and applied research

Contact Info

Product

Resources

About