1. Modified scaled Fourier linear combiner in thoracic impedance cardiography
- Author
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Allan Kardec Barros, Toshimichi Ishiguro, Akihito Umezu, Yoshifumi Yasuda, and Satoshi Horihata
- Subjects
Adult ,Male ,Materials science ,Time Factors ,Systole ,Acoustics ,Ensemble averaging ,Posture ,Health Informatics ,Thoracic impedance cardiography ,Cardiography, Impedance ,symbols.namesake ,Electrocardiography ,Heart Rate ,Tachycardia ,Bradycardia ,Waveform ,Humans ,Electrical impedance ,Fourier Analysis ,Attenuation ,Phase distortion ,Phonocardiography ,Signal Processing, Computer-Assisted ,Middle Aged ,Computer Science Applications ,Fourier transform ,Systolic time intervals ,symbols ,Artifacts ,Algorithms - Abstract
New filtering algorithms; a modified scaled Fourier linear combiner (mSFLC) and a modified ensemble averaging (mEA) are proposed to remove the phase distortion of the impedance waveform caused by SFLC. Performance of the filters is assessed from the shape of the filtered waveform and the estimation of systolic time intervals. It was found that the mSFLC and mEA could compensate for drawbacks of the SFLC and precisely reproduce the impedance waveforms; however, misinterpretation and attenuation in the cardiac variables may be caused when abrupt changes or irregularities occur in the source waveform.
- Published
- 2005