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Antena endoskopu kapsułkowego przeznaczona do pracy w pasmie MICS 400 MHz

Oleksy Paweł, Januszkiewicz Łukasz

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

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2023

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nr 4

305--308

PL

Endoskopy kapsułkowe to miniaturowe urządzenia elektroniczne służące do rejestracji obrazu wnętrza przewodu pokarmowego. W artykule przedstawiono projekt anteny endoskopu kapsułkowego pracującej w pasmie przeznaczonym do zastosowań medycznych: MICS 400 MHz. Opracowana antena charakteryzuje się dobrym dopasowaniem impedancyjnym w różnych obszarach przewodu pokarmowego człowieka. Konstrukcja anteny umożliwia dopasowanie jej kształtu do obudowy endoskopu kapsułkowego. Przedstawiono wyniki symulacji oraz pomiarów parametrów prototypowej anteny.

EN

Capsule endoscopes are miniature electronic devices used to record the image of the inside of the digestive tract. The article presents the design of an antenna designed to work in a capsule endoscope in the band dedicated for medical applications: MICS 400 MHz. The proposed antenna is characterized by good impedance matching in various areas of the human digestive tract. The design of the antenna allows its shape to be adapted to the housing of the capsule endoscope. The results of simulations and measurements of the parameters of the prototype antenna are presented.

2

Lokalizacja bezprzewodowych endoskopów kapsułkowych z wykorzystaniem algorytmu wyboru odbiorników

Oleksy Paweł, Januszkiewicz Łukasz

Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne

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2022

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nr 4

624--627

PL

W artykule przedstawiono modyfikację algorytmu bezprzewodowej lokalizacji endoskopów kapsułkowych, opartego o analizę fazy i mocy sygnału odebranego. Opisany wariant wykorzystuje nadmiarową liczbę odbiorników, dzięki czemu możliwe jest wybranie sygnałów gwarantujących najlepszą zbieżność algorytmu, a co za tym idzie największą dokładność estymacji położenia. Przedstawiony algorytm wyboru odbiorników zewnętrznych w oparciu o kryterium mocy odebranej, pozwolił zmniejszyć błąd lokalizacji o 22%.

EN

The article presents a modification of the algorithm for the wireless location of capsule endoscopes based, on the received signal phase and power analysis. The described variant uses an redundant number of receivers, thanks to which it is possible to select signals that guarantee the best convergence of the algorithm, and thus the highest accuracy of position estimation. The presented algorithm for selecting external receivers based on the received power criterion allowed to reduce the location error by 20%.

3

Wireless Capsule Endoscope Localization with Phase Detection Algorithm and Simplified Human Body Model

Oleksy Paweł, Januszkiewicz Łukasz

International Journal of Electronics and Telecommunications

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2020

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Vol. 66, No. 1

45--51

EN

Wireless endoscopic capsules can transmit the picture of the inside of the digestive tract to the external receiver for the purpose of gastrointestinal diseases diagnose. The localization of the capsule is needed to correlate the picture of detected anomalies with the particular fragment of intestine. For this purpose, the analysis of wireless transmission parameters can be applied. Such methods are affected by the impact of the human body on the electromagnetic wave propagation that is specific to the anatomy of individual person. The article presents the algorithm of localization of endoscopic capsules with wireless transmitter based on the detection of phase difference of received signals. The proposed algorithm uses simplified human body models that can change their dielectric properties in each iteration to improve the location of the capsule endoscope. Such approach allows to reduce localization error by around 12 mm (15%) and can by used for patients of different physique without the need of the numerical models of individual body.

4

Ultra-wide-angle Wireless Endoscope with a Backend-camera-controller Architecture

Shim D., Yi J.

International Journal of Electronics and Telecommunications

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2017

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Vol. 63, No. 1

19--24

EN

This paper presents a wireless endoscope with an ultra-wide FOV (Field of View) of 130° and HD resolution (1280x720 pixels). The proposed endoscope consists of a camera head, cable, camera controller, and wireless handle. The lens module with a 150° degrees AOV (Angle of View) is achieved using the plastic injection-molding process to reduce manufacturing costs. A serial CMOS image sensor using the MIPI (Mobile Industry Processor Interface) CSI-2 (Camera Serial Interface-2) interface physically separates the camera processor from the camera head. The camera head and the cable have a compact structure due to the BCC (Backend-Camera-Controller) architecture. The size of the camera head and the camera controller is 8x8x26 mm and 7x55 mm, respectively. The wireless handle supports a UWB (Ultra-Wide-Band) or a Wi-Fi communication to transmit video data. The UWB link supports a maximum data transfer rate of ~37 Mbps to transmit video data with a resolution of 1280x720 pixels at a frame rate of 30 fps in the MJPEG (Motion JPEG) format. Although the Wi-Fi link provides a lower data transfer rate (~8 Mbps Max.), it has the advantage of flexible interoperability with various mobile devices. The latency of the UWB link is measured to be ~0.1 sec. The Wi-Fi link has a larger latency (~0.5 sec) due to its lower data transfer rate. The proposed endoscope demonstrates the feasibility of a high-performance yet low-cost wireless endoscope using the BCC architecture. To the best of the author’s knowledge, the proposed endoscope has the largest FOV among all presently existing wireless endoscopes.