| Full text | |
| Author(s): |
Tardelli, Gabriela P. P.
;
Phan, Tan
;
Strasburger, Janette
;
Baffa, Oswaldo
;
Wakai, Ronald
Total Authors: 5
|
| Document type: | Journal article |
| Source: | JOURNAL OF CLINICAL MEDICINE; v. 12, n. 9, p. 11-pg., 2023-04-24. |
| Abstract | |
Fetal magnetocardiography (fMCG) has proven to be an important tool for the prenatal monitoring of electrical cardiac activity; however, the high cost of superconducting quantum instrumentation (SQUID) poses a limitation for the dissemination of fMCG as a routine clinical technique. Recently, optically pumped magnetometers (OPMs) operating within person-sized, cylindrical shields have made fMCG more practical, but environmental magnetic interference entering through the shield opening substantially degrades the quality of fMCG signals. The goal of this study was to further attenuate these interferences by placing the OPM array within a small ferrite shield. FMCG recordings were made with and without the ferrite shield in ten subjects inside a person-sized, three-layer mu-metal cylindrical shield. Although the fetal signal was slightly attenuated, the environmental interference was reduced substantially, and maternal interference was also diminished. This increased the signal-to-noise ratio significantly and improved the resolution of the smaller waveform components. The performance improvement was highest in the axial direction and compensated for a major weakness of open-ended, person-sized shields. The ferrite shield is especially beneficial for the deployment of triaxial OPM sensors, which require effective shielding in all directions. (AU) | |
| FAPESP's process: | 13/07699-0 - Research, Innovation and Dissemination Center for Neuromathematics - NeuroMat |
| Grantee: | Oswaldo Baffa Filho |
| Support Opportunities: | Research Grants - Research, Innovation and Dissemination Centers - RIDC |
| FAPESP's process: | 21/06224-4 - Construction of a high performance shield for in vivo studies with optical pumping magnetometers |
| Grantee: | Oswaldo Baffa Filho |
| Support Opportunities: | Regular Research Grants |