Magnetocardiography

A method for magnetocardiography functional localization based on boundary element method and Nelder–Mead simplex algorithm

“…All these factors need to be considered to refine the forward model. The good news is that the MCG is less sensitive to the conductivity properties of the torso comparing with ECG (Mäkijärvi et al, 2010), implying that the volume modeling can be relatively simplified.…”

Unshielded magnetocardiography: Repeatability and reproducibility of automatically estimated ventricular repolarization parameters in 204 healthy subjects

“…MCG is a contactless alternative for faster mass screening (Mäkijärvi et al., ; Malmivuo, ; Steinhoff et al., ; Tavarozzi, Comani, Del Gratta, Romani et al., ; Wu et al., ) and radiation‐ and risk‐free method for three‐dimensional electro‐anatomical imaging through passive detection of CMF (Agarwal et al., ; Brisinda et al., ; Brockmeier et al., ; Fenici, Brisinda, Meloni, Sternickel, & Fenici, ; Hailer, Van Leeuwen et al., ; Kandori et al., ; Kwon et al., ; Kwong et al., ; Leithäuser et al., ; Li et al., ; Lim et al., ; Ogata et al., ; Park & Hill, ; Park et al., , ; Shin et al., ; Steinisch et al., ; Tolstrup et al., ; Wu et al., ), which is directly related primary electrophysiological source (the impressed current), thus containing information undetectable with ECG (Fenici, Brisinda, & Meloni, ; Tavarozzi, Comani, Del Gratta, Di Luzio et al., ). VR analysis is considered one of the most useful applications of MCG, mainly to recognize ischemic, inflammatory, or degenerative abnormalities (Tavarozzi, Comani, Del Gratta, Di Luzio et al., ).…”

“…VR analysis is considered one of the most useful applications of MCG, mainly to recognize ischemic, inflammatory, or degenerative abnormalities (Tavarozzi, Comani, Del Gratta, Di Luzio et al., ). However, although some attempts to assess the reproducibility and comparability of MCG parameters gathered with different instrumentations have been reported (Burghoff, Nenonen, Trahms, & Katila, ; Nalbach et al., ; Pesola et al., ; Smith et al., ; Takala et al., ), a standardization adequate for clinical application is still missing, especially taking into account the potential source of error due to different S/Nr and/or sequential data acquisition (Bang et al., ; Hänninen et al., ; Kawakami et al., ; Mäkijärvi et al., ; Shin et al., ) as occurs with most instrumentations for unshielded MCG (Fenici, Brisinda, & Meloni, ; Leder et al., ) due to their limited number of sensors.…”

“…Compared to the electrocardiogram (ECG), MCG provides additional information, being CMF less affected by tissue conductivities, and is more sensitive to tangential currents, and capable to detect vortex currents too (Brockmeier et al., ; Fenici Brisinda, & Meloni ). Although mainly confined in research laboratories, MCG is increasingly used to study cardiac arrhythmias (Fenici, Brisinda, Venuti, & Sorbo, ; Fenici, Brisinda, & Meloni, ; Kwong, Leithäuser, Park, & Yu, ; Mäkijärvi et al., ) and ventricular repolarization (VR) abnormalities (VRa) due to different cardiopathy (Kawakami et al., ), especially ischemic heart disease (IHD) (Agarwal, Saini, Alyousef, & Umscheid, ; Brisinda, Bottelli, Napolitano, Priori, & Fenici, ; Fenici, Brisinda, Meloni, Sternickel, & Fenici, ; Hailer, Chaikovsky, Auth‐Eisernitz, Schäfer, & Van Leeuwen, ; Kandori et al., ; Kwon et al., ; Leithäuser, Park, Hill, Lam, & Jung, ; Li et al., ; Lim et al., ; Ogata et al., ; Park & Hill, ; Park, Leithäuser, Hill, & Jung, ; Park et al., ; Shin et al., ; Steinisch et al., ; Tolstrup et al., ; Wu et al., ).…”

“…MCG instrumentation is typically classified by the method used to improve the signal‐to‐noise ratio (S/Nr) (Fenici et al., ; Mäkijärvi et al., ; Tavarozzi, Comani, Del Gratta, Di Luzio et al., ). Although electromagnetic shielding provides a better S/Nr, it is unpractical for clinical use, impeding quick ambulatory screening and bedside MCG.…”