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首页> 外文期刊>IEEE Transactions on Magnetics >Improving Tip Position-Estimation Performance of Gastric Tube by Compensating Geomagnetic Field With Offset Coils
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Improving Tip Position-Estimation Performance of Gastric Tube by Compensating Geomagnetic Field With Offset Coils

机译:通过补偿偏置线圈的地磁场来改善胃管的尖端位置估计性能

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摘要

To guide gastric tubes into the stomach correctly, we propose the position-guidance system of a permanent magnet attached to the tip of the tube using high-sensitivity magnetoresistance (MR) sensors placed outside the patient's body. To enhance the sensitivity of the magnetic sensors and improve the position-estimation performance, we employ a small offset coil surrounding the magnetic sensor to compensate the geomagnetic field and evaluate the effect of the geomagnetic field compensation. The results show that the mean value of the position-estimation error with the compensation was less than 10 mm, even when the distance between the permanent magnet and MR sensors is 190 mm, whereas the mean value without the compensation exceeds 10 mm when the distance is greater than 150 mm. This suggests that the proposed compensation method improves the performance and broadens the scope of application for different users, e.g., pregnant or obese patients, of the guide system.
机译:为了将胃管正确地引导到胃中,我们建议使用放置在患者体外的高灵敏度磁阻(MR)传感器将永久磁铁的位置引导系统连接到管的尖端。为了提高磁传感器的灵敏度并改善位置估计性能,我们在磁传感器周围采用了一个小的偏置线圈来补偿地磁场并评估地磁场补偿的效果。结果表明,即使在永磁体与MR传感器之间的距离为190 mm的情况下,带补偿的位置估计误差的平均值也小于10 mm,而当没有距离时,没有补偿的平均值超过10 mm大于150毫米。这表明,所提出的补偿方法改善了性能,并扩大了针对引导系统的不同用户(例如孕妇或肥胖患者)的应用范围。

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