Reconstruction of stomach geometry using magnetic source localization.
Reconstruction of stomach geometry using magnetic source localization.
复制标题
使用磁源定位重建胃几何结构。
DOI：
10.1109/embc46164.2021.9630644
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Avci,Recep
中科院分区：
文献类型：
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作者：
Eichler,ChadE;Cheng,LeoK;Paskaranandavadivel,Niranchan;Alighaleh,Saeed;Angeli-Gordon,TimothyR;Du,Peng;Bradshaw,LeonardA;Avci,Recep
胃动力障碍的常规诊断是当前临床实践中的一个重大问题。无创胃电图 (EGG) 和胃磁图 (MGG) 能够评估与运动障碍相关的胃慢波 (SW) 节律失常。然而，这两种方式都缺乏可靠检测 SW 活动模式的标准化方法。与胃的几何形状及其在躯干内的位置相关的特定于主题的解剖信息有可能帮助发展SW和远场之间的关系。在这项研究中，我们证明了使用磁源定位来重建解剖学上真实的 3D 胃模型的几何形状的可行性。由 27 个磁力计组成的阵列记录了按顺序放置在 64 个位置的小型 (6.35 × 6.35 mm) N35 钕磁铁产生的磁场。最后，使用磁偶极近似和粒子群优化器来估计永磁体的位置和方向。位置和方向误差的中值分别为 3.8 毫米和 7.3°。估计的位置用于构建表面网格，重建模型和地面实况模型的豪斯多夫距离和平均豪斯多夫距离差异度量分别为 11.6 毫米和 2.4 毫米。结果表明，使用磁偶极子模型进行源定位可以成功重建胃的几何形状。
Routine diagnosis of gastric motility disorders represents a significant problem to current clinical practice. The non-invasive electrogastrogram (EGG) and magnetogastrogram (MGG) enable the assessment of gastric slow wave (SW) dysrhythmias that are associated with motility disorders. However, both modalities lack standardized methods for reliably detecting patterns of SW activity. Subject-specific anatomical information relating to the geometry of the stomach and its position within the torso have the potential to aid the development of relations between SWs and far-fields. In this study, we demonstrated the feasibility of using magnetic source localization to reconstruct the geometry of an anatomically realistic 3D stomach model. The magnetic fields produced by a small (6.35 × 6.35 mm) N35 neodymium magnet sequentially positioned at 64 positions were recorded by an array of 27 magnetometers. Finally, the magnetic dipole approximation and a particle swarm optimizer were used to estimate the position and orientation of the permanent magnet. Median position and orientation errors of 3.8 mm and 7.3° were achieved. The estimated positions were used to construct a surface mesh, and the Hausdorff Distance and Average Hausdorff Distance dissimilarity metrics for the reconstructed and ground-truth models were 11.6 mm and 2.4 mm, respectively. The results indicate that source localization using the magnetic dipole model can successfully reconstruct the geometry of the stomach.