Estimation of Magnetocardiography Current Sources Using Reconstructed Magnetic Field Data

Sun, Wenxu; Kobayashi, Kei

doi:10.1109/tmag.2017.2728100

Cited by 5 publications

(1 citation statement)

References 8 publications

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“…However, when the data in only one measurement plane is used, a sufficient suppressing effect is not obtained. Therefore, we proposed the method using two planes data 8) . First, the current source is estimated using one plane (MCG data).…”

Section: Introductionmentioning

confidence: 99%

Magnetocardiography Current Source Estimation using Multiple Spatial Filters

et al. 2021

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In this study, cardiac current source localization was simulated using the spatial filter method. We estimated current sources using data from two measurement surfaces, i.e., the front and back of the subject, to reduce the large spatial extension in the depth direction. Three methods for creating spatial filters were developed using the exact lowresolution brain electromagnetic tomography method based on different creation procedures. The first method is a general method that has been conventionally used to create a spatial filter (64ch spatial filter) using a 64ch sensor on the front side. The second method is to create a spatial filter (128ch spatial filter) using two 64ch sensors on the front and back sides as a 128ch sensor. The third method is to create two spatial filters separately and use them as one spatial filter (2 × 64ch spatial filter). In this case, different Tikhonov regularization parameters can be determined on the front and back sides, and optimum noise immunity can be given to each. The accuracy of the estimated current sources using the three types of spatial filters was examined using simulation and MCG data. The results show that the 2 × 64 spatial filter has the highest estimation accuracy and suppresses the large spatial extension of the estimated current sources.

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Section: Introductionmentioning

confidence: 99%

Magnetocardiography Current Source Estimation using Multiple Spatial Filters

et al. 2021

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Magnetic Source Imaging Using a Pulsed Optically Pumped Magnetometer Array

Borna

Carter

DeRego

et al. 2019

IEEE Trans. Instrum. Meas.

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We have developed a pulsed optically pumped magnetometer (OPM) array for detecting magnetic field maps originated from an arbitrary current distribution. The presented magnetic source imaging (MSI) system features 24 OPM channels, has a data rate of 500 S/s, a sensitivity of 0.8 pT / Hz, and a dynamic range of 72 dB. We have employed our pulsed-OPM MSI system for measuring the magnetic field map of a test coil structure. The coils are moved across the array in an indexed fashion to measure the magnetic field over an area larger than the array. The captured magnetic field maps show excellent agreement with the simulation results. Assuming a 2D current distribution, we have solved the inverse problem, using the measured magnetic field maps, and the reconstructed current distribution image is compared to that of the simulation.

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