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논문 기본 정보

자료유형
학술저널
저자정보
김기웅 (Biomagnetism Research Center, Korea Research Institute of Standards and Science) 권혁찬 (Biomagnetism Research Center, Korea Research Institute of Standards and Science) 김기담 (Biomagnetism Research Center, Korea Research Institute of Standards and Science) 이용호 (Biomagnetism Research Center, Korea Research Institute of Standards and Science) 김진목 (Biomagnetism Research Center, Korea Research Institute of Standards and Science) 김인선 (Biomagnetism Research Center, Korea Research Institute of Standards and Science) 임현균 (Biomagnetism Research Center, Korea Research Institute of Standards and Science) 박용기 (Biomagnetism Research Center, Korea Research Institute of Standards and Science) 김두상 (Seoul Veterans Hospital) 임승평 (Chungnam National University Hospital)
저널정보
한국초전도학회 Progress in superconductivity Progress in superconductivity 제7권 제1호
발행연도
2005.1
수록면
28 - 35 (8page)

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We propose a method to measure atrial arrhythmias (AA) such as atrial fibrillation (Afb) and atrial flutter (Afl) with a SQUID magnetocardiograph (MCG) system. To detect AA is one of challenging topics in MCG. As the AA generally have irregular rhythm and atrio-ventricular conduction, the MCG signal cannot be improved by QRS averaging; therefore a SQUID MCG system having a high SNR is required to measure informative atrial excitation with a single scan. In the case of Afb, diminished f waves are much smaller than normal P waves because the sources are usually located on the posterior wall of the heart. In this study, we utilize an MCG system measuring tangential field components, which is known to be more sensitive to a deeper current source. The average noise spectral density of the whole system in a magnetic shielded room was $10\;fT/{\surd}Hz(a)\;1\;Hz\;and\;5\;fT/{\surd}Hz\;(a)\;100\;Hz$. We measured the MCG signals of patients with chronic Afb and Afl. Before the AA measurement, the comparison between the measurements in supine and prone positions for P waves has been conducted and the experiment gave a result that the supine position is more suitable to measure the atrial excitation. Therefore, the AA was measured in subject's supine position. Clinical potential of AA measurement in MCG is to find an aspect of a reentry circuit and to localize the abnormal stimulation noninvasively. To give useful information about the abnormal excitation, we have developed a method, separative synthetic aperture magnetometry (sSAM). The basic idea of sSAM is to visualize current source distribution corresponding to the atrial excitation, which are separated from the ventricular excitation and the Gaussian sensor noises. By using sSAM, we localized the source of an Afl successfully.

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