An adaptive localization technique for wireless capsule endoscopy

Farhadi, Hamed; Atai, Javid; Skoglund, Mikael; Nadimi, Esmaeil S.; Pahlavan, Kaveh; Tarokh, Vahid

doi:10.1109/ismict.2016.7498884

Cited by 8 publications

(10 citation statements)

References 12 publications

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“…drug delivery) and brachytherapy where the knowledge of the exact location of the targeted area is crucial. Radio frequency (RF)‐based tracking (navigation and localisation) of robot‐assisted endoscopy, such as miniature wireless capsule endoscopy for gastrointestinal (GI) tract diagnosis, is a recent application in which the spatial resolution of the position and orientation highly depends on the model of ε′ and

ϵ^{normal′ normal′}

[2–5].…”

Section: Introductionmentioning

confidence: 99%

In vivo and in situ measurement and modelling of intra‐body effective complex permittivity

Nadimi

Blanes-Vidal

Harslund

et al. 2015

Healthcare Technology Letters

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Radio frequency tracking of medical micro-robots in minimally invasive medicine is usually investigated upon the assumption that the human body is a homogeneous propagation medium. In this Letter, the authors conducted various trial programs to measure and model the effective complex permittivity e in terms of refraction e′, absorption e″ and their variations in gastrointestinal (GI) tract organs (i.e. oesophagus, stomach, small intestine and large intestine) and the porcine abdominal wall under in vivo and in situ conditions. They further investigated the effects of irregular and unsynchronised contractions and simulated peristaltic movements of the GI tract organs inside the abdominal cavity and in the presence of the abdominal wall on the measurements and variations of e′ and e′′. They advanced the previous models of effective complex permittivity of a multilayer inhomogeneous medium, by estimating an analytical model that accounts for reflections between the layers and calculates the attenuation that the wave encounters as it traverses the GI tract and the abdominal wall. They observed that deviation from the specified nominal layer thicknesses due to non-geometric boundaries of GI tract morphometric variables has an impact on the performance of the authors' model. Therefore, they derived statistical-based models for e′ and e′′ using their experimental measurements.

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ϵ^{normal′ normal′}

[2–5].…”

Section: Introductionmentioning

confidence: 99%

In vivo and in situ measurement and modelling of intra‐body effective complex permittivity

Nadimi

Blanes-Vidal

Harslund

et al. 2015

Healthcare Technology Letters

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“…Additional tools like a suspected blood indicator (5), Lewis Score for evaluating Crohn's disease (6) and reading "accelerators" are available (7). Localization or 3D imaging is one key parameter to guide follow-up procedure, new techniques are currently under development (8).…”

Section: Capsule Types and Technologymentioning

confidence: 99%

A global perspective on capsule endoscopy

Nowak

2017

Ann. Transl. Med.

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A search of the internet today to quantify the estimated value of capsules from a global perspective, easily delivers figures stating around $200 million in 2014 to about $400 million by 2020, which would be approximately 10% of the gastrointestinal endoscopic market. Is this a steep rise within just six years or could the capsule market do even better? What chances does this offer and what are the key aspects for future success? By 2020, more than 1 billion people are aged sixty or older and around one third of them will live in what the UN calls "more developed regions". Naturally, this brings an increased demand for colorectal cancer screening and surgery. But keeping in mind that basically every healthcare system, in any country, is already operating at its limits, how do we secure future treatment for a growing community? Surely more competition will steadily bring down prices for capsules. However, that does not ease the amount of time that is spent to properly read any video and issue a valid diagnosis for every patient. This article intends to give an overview about the current global market for capsule endoscopy (CE) with a perspective on typical patients, their indications, and how the capsules are used and by whom. Further aspects, such as standardization of training, reading and future trends will also be elaborated on.

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“…One of the most efficient approach is using the RF signal that the capsule also uses to send images, in order to keep the hardware of the WCE simple. Among the RF-based localization techniques the Received Signal Strength metric is commonly preferred for its simplicity and less sensitivity to bandwidth limitations [8], [9], [10] with respect to time-based metrics such as time of arrival (ToA) [8], [11] or time difference of arrival (TDoA) [11]. In this case, ranging estimation is performed through a predefined path loss model which describes the attenuation of the RF signal as a function of the distance from the inbody source.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Localization Error for Capsule Endoscopy Applications at UWB Frequencies

Barbi

Perez-Simbor

Garcia-Pardo

et al. 2019

2019 13th International Symposium on Medical Information and Communication Technology (ISMICT)

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Localization for Wireless Capsule Endoscopy (WCE) in the Ultra-Wideband frequency band is a very active field of investigation due to its potential advantages in future endoscopy applications. Received Signal Strength (RSS) based localization is commonly preferred due to its simplicity. Previous studies on Ultra-Wideband (UWB) RSS-based localization showed that the localization accuracy depends on the average ranging error related to the selected combination of receivers, which not always is the one experiencing the highest level of received power. In this paper the tendency of the localization error is further investigated through supplementary software simulations and previously conducted laboratory measurements. Two-dimensional (2D) and threedimensional (3D) positioning are performed and the trend of the localization error compared in both cases. Results shows that the distribution of the selected path loss values, corresponding to the receivers used for localization, around the in-body position to estimate also affects the localization accuracy.

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An adaptive localization technique for wireless capsule endoscopy

Cited by 8 publications

References 12 publications

In vivo and in situ measurement and modelling of intra‐body effective complex permittivity

In vivo and in situ measurement and modelling of intra‐body effective complex permittivity

A global perspective on capsule endoscopy

Analysis of the Localization Error for Capsule Endoscopy Applications at UWB Frequencies

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