Vibration Isolation for Seismocardiogram Measurement in the OpenMRI-Guided Operating Theater
Vibration Isolation for Seismocardiogram Measurement in the OpenMRI-Guided Operating Theater
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OpenMRI 引导手术室中用于心震图测量的隔振
DOI：
10.1299/jsmec.46.1426
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
H. Iseki
中科院分区：
文献类型：
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作者：
K. Naemura;H. Iseki
本研究的目的是建立一种精确测量患者术中躺在开放式磁共振成像（openMRI）机中进行心肌缺血监测时的心震图（SCG）的方法。通过分析MRI扫描期间机架振动和健康志愿者的SCG来检查振动隔离。MRI机架振动的最大振幅为2.5 m/s2，这是超过100 Hz至500 Hz的几个峰值。在T1加权和T2加权序列下，观察到患者床振动振幅降低高达94%。病床振动的功率谱中心大于30 Hz。SCG的最大振幅为0.92m/s ~ 2，FFT分析显示SCG不高于25 Hz。SCG和患者床振动之间的信噪比被计算为从4到7。这些结果表明，可以在openMRI扫描期间监测SCG的峰值加速度。总之，振动分析表明在开放MRI引导手术室中使用压电加速度传感器进行心震图测量的可行性。
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 2.5m/s2, which are several peaks more than 100Hz up to 500Hz. 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 30Hz. The maximum amplitude of SCG was 0.92m/s2 and a FFT analysis revealed that the SCG was not higher than 25Hz. 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.