Pourhomayoun Mohammad, Fowler Mark, Jin Zhanpeng
Department of Electrical and Computer Engineering, Binghamton University, Binghamton, NY 13902-6000, USA.
Annu Int Conf IEEE Eng Med Biol Soc. 2012;2012:5757-60. doi: 10.1109/EMBC.2012.6347302.
Wireless communication medical implants are gaining an important role in healthcare systems by controlling and transmitting the vital information of the patients. Recently, Wireless Capsule Endoscopy (WCE) has become a popular method to visualize and diagnose the human gastrointestinal (GI) tract. Estimating the exact location of the capsule when each image is taken is a very critical issue in capsule endoscopy. Most of the common capsule localization methods are based on estimating one or more location-dependent signal parameters like TOA or RSS. However, some unique challenges exist for in-body localization due to the complex nature within the human body. In this paper, we propose a novel one-stage localization method based on spatial sparsity in 3D space. In this method, we directly estimate the location of the capsule (as the emitter) without going through the intermediate stage of TOA or signal strength estimation. We evaluate the performance of the proposed method using Monte Carlo simulation with an RF signal following the allowable power and bandwidth ranges according to the standards. The results show that the proposed method is very effective and accurate even in massive multipath and shadowing conditions.
无线通信医疗植入物通过控制和传输患者的重要信息，在医疗保健系统中发挥着重要作用。最近，无线胶囊内窥镜检查（WCE）已成为可视化和诊断人体胃肠道（GI）的一种常用方法。在胶囊内窥镜检查中，估计每次拍摄图像时胶囊的精确位置是一个非常关键的问题。大多数常见的胶囊定位方法都是基于估计一个或多个与位置相关的信号参数，如到达时间（TOA）或接收信号强度（RSS）。然而，由于人体内部的复杂性质，体内定位存在一些独特的挑战。在本文中，我们提出了一种基于三维空间空间稀疏性的新型单阶段定位方法。在这种方法中，我们直接估计胶囊（作为发射器）的位置，而无需经过TOA或信号强度估计的中间阶段。我们使用蒙特卡罗模拟评估所提出方法的性能，模拟中使用的射频信号遵循根据标准允许的功率和带宽范围。结果表明，即使在大量多径和阴影条件下，所提出的方法也非常有效和准确。
