Vibration isolation for seismocardiogram measurement in the open MRI-guided operating theater

Kiyoshi Naemura; Hiroshi Iseki

doi:10.1299/jsmec.46.1426

Vibration isolation for seismocardiogram measurement in the open MRI-guided operating theater

Kiyoshi Naemura^*, Hiroshi Iseki

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

The purpose of this study is to establish a method of measuring precisely the seismocardiogram (SCG) of a patient who lying in an open magnetic resonance imaging (openMRI) machine for myocardial ischemia monitoring during surgery. Vibration isolation was examined by analyzing the gantry vibration during MRI scanning and the SCG of a healthy volunteer. The MRI gantry vibration had maximum amplitude of 2.5 m/s², which are several peaks more than 100 Hz up to 500 Hz. Up to 94% reduction in amplitude was observed in the patient bed vibration under both T1-weighted and T2-weighted sequences. The power spectrum center of the patient bed vibration was more than 30 Hz. The maximum amplitude of SCG was 0.92 m/s² and a FFT analysis revealed that the SCG was not higher than 25 Hz. The signal-to-noise ratio between the SCG and the patient bed vibration was calculated to be from 4 to 7. These results demonstrate that the peak acceleration of the SCG can be monitored during openMRI scanning. In conclusion, vibration analysis showed the feasibility of using the piezoelectric acceleration sensor for seismocardiogram measurement in the openMRI-guided operating theater.

Original language	English
Pages (from-to)	1426-1433
Number of pages	8
Journal	JSME International Journal, Series C: Mechanical Systems, Machine Elements and Manufacturing
Volume	46
Issue number	4
DOIs	https://doi.org/10.1299/jsmec.46.1426
Publication status	Published - 2003 Dec

Keywords

Damping
Measurement
Open-MRI
Seismocardiogram
Vibration isolation

ASJC Scopus subject areas

Mechanical Engineering
Industrial and Manufacturing Engineering

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title = "Vibration isolation for seismocardiogram measurement in the open MRI-guided operating theater",

abstract = "The purpose of this study is to establish a method of measuring precisely the seismocardiogram (SCG) of a patient who lying in an open magnetic resonance imaging (openMRI) machine for myocardial ischemia monitoring during surgery. Vibration isolation was examined by analyzing the gantry vibration during MRI scanning and the SCG of a healthy volunteer. The MRI gantry vibration had maximum amplitude of 2.5 m/s2, which are several peaks more than 100 Hz up to 500 Hz. Up to 94% reduction in amplitude was observed in the patient bed vibration under both T1-weighted and T2-weighted sequences. The power spectrum center of the patient bed vibration was more than 30 Hz. The maximum amplitude of SCG was 0.92 m/s2 and a FFT analysis revealed that the SCG was not higher than 25 Hz. The signal-to-noise ratio between the SCG and the patient bed vibration was calculated to be from 4 to 7. These results demonstrate that the peak acceleration of the SCG can be monitored during openMRI scanning. In conclusion, vibration analysis showed the feasibility of using the piezoelectric acceleration sensor for seismocardiogram measurement in the openMRI-guided operating theater.",

keywords = "Damping, Measurement, Open-MRI, Seismocardiogram, Vibration isolation",

author = "Kiyoshi Naemura and Hiroshi Iseki",

year = "2003",

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language = "English",

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AU - Iseki, Hiroshi

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N2 - The purpose of this study is to establish a method of measuring precisely the seismocardiogram (SCG) of a patient who lying in an open magnetic resonance imaging (openMRI) machine for myocardial ischemia monitoring during surgery. Vibration isolation was examined by analyzing the gantry vibration during MRI scanning and the SCG of a healthy volunteer. The MRI gantry vibration had maximum amplitude of 2.5 m/s2, which are several peaks more than 100 Hz up to 500 Hz. Up to 94% reduction in amplitude was observed in the patient bed vibration under both T1-weighted and T2-weighted sequences. The power spectrum center of the patient bed vibration was more than 30 Hz. The maximum amplitude of SCG was 0.92 m/s2 and a FFT analysis revealed that the SCG was not higher than 25 Hz. The signal-to-noise ratio between the SCG and the patient bed vibration was calculated to be from 4 to 7. These results demonstrate that the peak acceleration of the SCG can be monitored during openMRI scanning. In conclusion, vibration analysis showed the feasibility of using the piezoelectric acceleration sensor for seismocardiogram measurement in the openMRI-guided operating theater.

AB - The purpose of this study is to establish a method of measuring precisely the seismocardiogram (SCG) of a patient who lying in an open magnetic resonance imaging (openMRI) machine for myocardial ischemia monitoring during surgery. Vibration isolation was examined by analyzing the gantry vibration during MRI scanning and the SCG of a healthy volunteer. The MRI gantry vibration had maximum amplitude of 2.5 m/s2, which are several peaks more than 100 Hz up to 500 Hz. Up to 94% reduction in amplitude was observed in the patient bed vibration under both T1-weighted and T2-weighted sequences. The power spectrum center of the patient bed vibration was more than 30 Hz. The maximum amplitude of SCG was 0.92 m/s2 and a FFT analysis revealed that the SCG was not higher than 25 Hz. The signal-to-noise ratio between the SCG and the patient bed vibration was calculated to be from 4 to 7. These results demonstrate that the peak acceleration of the SCG can be monitored during openMRI scanning. In conclusion, vibration analysis showed the feasibility of using the piezoelectric acceleration sensor for seismocardiogram measurement in the openMRI-guided operating theater.

KW - Damping

KW - Measurement

KW - Open-MRI

KW - Seismocardiogram

KW - Vibration isolation

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Vibration isolation for seismocardiogram measurement in the open MRI-guided operating theater

Abstract

Keywords

ASJC Scopus subject areas

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