Wideband Characterization of RF Propagation for Time-of Arrival Localization of Wireless Video Capsule Endoscope Inside Small Intestine
نویسندگان
چکیده
Localization of Wireless Capsule Endoscope (WCE) inside the small intestine is a very challenging problem, which is very important for the diagnosis of certain diseases. Previous studies have shown that Time-of-Arrival (TOA) localization can be more effective than Received Signal Strength (RSS) based localization. Performance evaluation of TOA-based localization techniques for WCE requires understanding of wideband RF propagation characteristics from the internals of small intestines. Since these measurements are difficult, we need to resort to simulation techniques and validating the results of simulations with empirical measurements. In this paper, we first validate the measurements of wideband characteristics of RF signals pertinent to TOA in homogeneous tissues using a SEMCAD X simulation software platform. Then we use the software for simulation of TOA from inside the human body and the small intestine. Finally, we analyze and assess TOA techniques regarding the nonhomogeneous environment inside the human body. Keywords—SEMCAD X, simulation, nonhomogeneous tissue, Wideband measurement, BAN application, small intestine, Wirelss Capulse Endoscopy
منابع مشابه
Comparative Performance Evaluation of RF Localization for Wireless Capsule Endoscopy Applications
This paper presents an assessment of the accuracy of cooperative localization of a wireless capsule endoscope(WCE) using radio frequency (RF) signals with particular emphasis on localization inside the small intestine. We derive the Cramer-Rao Lower Bound (CRLB) for cooperative location estimators using the received signal strength(RSS) or the time of arrival (TOA) of the RF signal. Our derivat...
متن کاملA Video Aided RF Localization Technique for the Wireless Capsule Endoscope (WCE) inside Small Intestine
Wireless capsule endoscope (WCE) provides a noninvasive method to examine the entire gastrointestinal (GI) tract including small intestine, which other video endoscopic instruments cannot reach. Since the shape of small intestine is extremely complex and the length of small intestine varies from 5 to 9 meters, localization of the WCE inside the small intestine is very challenging. Traditional r...
متن کاملHybrid RF Localization inside Small Intestine using Images from Wireless Capsule Endoscopy
Wireless capsule endoscope (WCE) provides a noninvasive method to examine the entire gastrointestinal (GI) tract including small intestine, which other video endoscopic instruments cannot reach. However, since the shape of the small intestine is extremely complex and the length of small intestine varies from 5m to 9m, localization of the capsule inside small intestine is very challenging. Exist...
متن کاملBounds on Rf Cooperative Localization for Video Capsule Endoscopy
Wireless video capsule endoscopy has been in use for over a decade and it uses radio frequency (RF) signals to transmit approximately fifty five thousands clear pictures of inside the GI tract to the body-mounted sensor array. However, physician has no clue on the exact location of the capsule inside the GI tract to associate it with the pictures showing abnormalities such as bleeding or tumors...
متن کاملAccuracy Bounds for and RSS and TOA based RF Localization in capsule endoscopy
In this paper, we derive and analyze cooperative localization bounds for endoscopic wireless capsule as it passes through the human gastrointestin (GI) tract. We derive the Cramer-Rao lower bound (CRLB) variance limits on location estimators which use measured received signal strength(RSS) and ranging error limits using time of arrival (TOA). Using a three-dimension human body model from a full...
متن کامل