Improved Wireless Capsule Endoscope Localization with Phase Detection Algorithm

Abstract

Wireless capsule endoscopes record and transmit pictures that are used to diagnose the human digestive tract. The localization of the capsule allows precise identification of regions with lesions. This can be performed basing on the processing of signal received from the capsule. Since human body is complex heterogenous environment, that influences the propagation of wireless signal it is difficult to precisely determine the distance between the transmitter and the receiver upon the analysis of received power level. The article presents the improved method of locating endoscope capsules with the use of phase detection algorithm. This algorithm applies adaptive estimation of human body model permittivity for each capsule position. Also the influence of helical and dipole antennas on the localization accuracy were examined.