Study of Spatial Filter for Magnetocardiography Measurements without a Magnetically Shielded Room
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- Ogata Yuji
- Advantest Laboratories Ltd.
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- Tanaka Takeshi
- Advantest Laboratories Ltd.
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- Hata Yoshiyuki
- Advantest Laboratories Ltd.
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- Kakinuma Bunichi
- Advantest Laboratories Ltd.
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- Ueda Tomoaki
- PhosMega Co., Ltd.
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- Kobayashi Koichiro
- Faculty of Science and Engineering, Iwate University
説明
<p>Magnetocardiography (MCG) is an effective modality for clinical application and health monitoring due to non-contact measurement and mapping of heart activity at high spatial resolution. A superconducting quantum interference device (SQUID) magnetometer is usually used for measuring MCG signals. However, a SQUID magnetometer has high running cost due to the liquid helium. Moreover, measuring MCG signals inside a magnetically shielded room (MSR) can be costly. Therefore, we developed a 64-channel magneto-impedance (MI) sensor system that does not require an MSR. However, the MCG measurement has very high noise level without an MSR. In this paper, we discuss the signal processing techniques of various noise reduction methods to decrease very loud noises. In particular, we investigated three spatial filter conditions that decrease correlated noises among the 64-channel signals to achieve a high peak value of MCG signals. By using a spatial filter that uses the average of the circumference channels and gradient, the distortion of MCG signals can be reduced. The average reduction in amplitude of the R wave as a result of using a spatial filter was 4.5 pT. Furthermore, the signal to noise ratio (SNR) of the P wave was 29.1 dB, while that of the R wave was 42.3 dB, and clear MCG signals were obtained when using the spatial filter that uses the average of the circumference channels and the gradient. Finally, we successfully measured the MCG signals without an MSR.</p>
収録刊行物
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- Advanced Biomedical Engineering
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Advanced Biomedical Engineering 8 (0), 170-176, 2019
公益社団法人 日本生体医工学会
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詳細情報 詳細情報について
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- CRID
- 1390845702310524544
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- NII論文ID
- 130007740907
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- ISSN
- 21875219
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- 本文言語コード
- en
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- 資料種別
- journal article
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
- KAKEN
- OpenAIRE
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- 抄録ライセンスフラグ
- 使用不可