The human vector magnetogastrogram and magnetoenterogram
The human vector magnetogastrogram and magnetoenterogram
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DOI：
10.1109/10.775406
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发表时间：
1999-08-01
影响因子：
4.6
通讯作者：
Richards, WO
中科院分区：
文献类型：
--
作者：
Bradshaw, LA;Ladipo, JK;Richards, WO
胃肠系统中的电活动产生可以用超导量子干涉装置磁力计测量的磁场。虽然典型的磁力计具有测量磁场的单个分量的检测线圈，但是胃和肠磁场是矢量。我们记录了胃和肠的磁场从9个腹部部分在9个正常的人类志愿者使用矢量磁力计，测量所有三个笛卡尔分量的磁场矢量。利用矢量投影技术分离出胃和肠活动的磁场矢量，胃磁场矢量朝向头侧，与先前观测的数据一致，并显示胃电活动的振荡特征（f = 3.03 +/-0.18周/分），虽然小肠磁场矢量显示没有一致的方向，但观察到小肠电活动的特征频率梯度。胃和肠的磁场矢量定向在不同的方向，从而区分矢量投影技术。观察到的胃和肠的磁场矢量的方向的差异表明，矢量记录显着增加的能力，从非生理成分分离的生理信号分量，并区分不同的生理成分。
Electrical activity in the gastrointestinal system produces magnetic fields that may be measured with superconducting quantum interference device magnetometers, Although typical magnetometers have detection coils that measure a single component of the magnetic field, gastric and intestinal magnetic fields are vector quantities. We recorded gastric and intestinal magnetic fields from nine abdominal sections in nine normal human volunteers using a vector magnetometer that measures all three Cartesian components of the magnetic field vector. A vector projection technique was utilized to separate the magnetic field vectors corresponding to gastric and intestinal activity, The gastric magnetic field vector was oriented in a cephalad direction, consistent with previously observed data, and displayed oscillatory characteristics of gastric electrical activity (f = 3.03 +/-0.18 cycles/min), Although the small bowel magnetic field vector showed no consistent orientation, the characteristic frequency gradient of the small bowel electrical activity was observed. Gastric and intestinal magnetic field vectors were oriented in different directions and were thus distinguished by the vector projection technique. The observed difference in direction of gastric and intestinal magnetic field vectors indicates that vector recordings dramatically increase the ability to separate physiological signal components from nonphysiological components and to distinguish between different physiological components.