Modelling Dynamically Re-Sizeable Electrodes (DRE) for Targeted Transcutaneous Measurements in Impedance Plethysmography

Hashim, Zaheer Q.; Constantinou, Loucas; Triantis, Iasonas F.

doi:10.1109/tbcas.2019.2959437

Cited by 3 publications

(8 citation statements)

References 30 publications

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“…Aiming to explore the principles and merits of planar mapping and similar to other studies (e.g. [13]) this model was simplified in terms of its composition and its geometrical complexity, as it was limited to three homogeneous tissue layers (see section II-A) without any other vasculature in the vicinity. Two versions were realised, as described later: an FEM model and a gelatine phantom for experimental verification.…”

Section: Methodsmentioning

confidence: 99%

“…This work builds on our previous work, described in [13] and [25]. In [13] we identified the advantage of localised electrodes, placed directly above the targeted subcutaneous vasculature, relative to larger more commonly used electrodes (e.g. ECG electrodes).…”

Section: Introductionmentioning

confidence: 96%

“…A sensing modality that would allow for a point-ofcare (PoC) diagnostic device to satisfy the above criteria is bio-impedance (or electrical impedance). Bioimpedance has been used in a variety of medical applications, ranging from cardiovascular plethysmographic measurements [10]- [13], lung monitoring [14], [15], detection of breast cancer [16], mapping wound areas in chronic ulcers [17] and many others [18], [19]. Bioimpedance systems are inexpensive, easy to use without specialist training, providing rapid outcomes without the use of harmful ionising radiation [10].…”

Section: Introductionmentioning

confidence: 99%

“…However, single tetrapole arrangements ideally need to be aligned to the targeted artery, thus requiring the latter's location and orientation to be known in advance. Failing to place and size the electrodes accordingly, degrades measurement sensitivity due the surrounding tissue's impedance [13]. Moreover, the approach of analysing plethysmographic waveform features for indications of stenosis presence, while valuable, does not reveal any topological information.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, for EIT-based carotid artery scanning, electrodes would need to be applied around the neck of the patient and, given its poor spatial resolution [18], [19], [24], it would not offer useful information about a localised structure, such as the carotid artery. Solutions that include elements from both the single tetrapole and the EIT approaches have been described in [13], [25]. For the desired method, topological information is needed to detect the outline of the artery, in terms of position and orientation, to avoid the operator dependence of manually re-positioning the sensor.…”

Section: Introductionmentioning

confidence: 99%

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A Quadruple-Sweep Bioimpedance Sensing Method for Arterial Stenosis Detection

Rahman,

Liatsis,

Hashim

et al. 2024

IEEE Access

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Current carotid atherosclerosis diagnostic protocols do not feature techniques that would allow for early or frequent medical examinations, leaving a significant number of asymptomatic carotid stenosis cases undetected and often leading to strokes. The key challenge is that current diagnostics are highly operator-dependent. In this work we used idealised biological models to demonstrate a new rapid, potentially inexpensive and operator-independent diagnostic method, aimed at detecting whether a stenosis exists, rather than seeking to be accurately quantifying or localising it. An array of electrodes was used to obtain sequential bioimpedance values over the skin, through a novel scanning technique, covering an area over the artery of interest. FEM simulations, verified through in-vitro experiments on gelatine phantoms, were used to validate the method. The final results, obtained through image processing algorithms, were in the form of planar bio-impedance maps and were successful both in identifying arterial features and detecting the presence of stenoses of different sizes. The results could also be used to indicate the artery's relative orientation to the sensor, eliminating the need for manual alignment by a specialist operator. Therefore, this method shows promise for routine medical examination, either in primary care, or even at home, to indicate whether a patient would require further, more detailed examinations at a specialist clinic.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Quadruple-Sweep Bioimpedance Sensing Method for Arterial Stenosis Detection

Rahman,

Liatsis,

Hashim

et al. 2024

IEEE Access

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Noninvasive Continuous Blood Pressure Estimation From Pulse Transit Time: A Review of the Calibration Models

Barvik

Černý

Penhaker

et al. 2022

IEEE Rev. Biomed. Eng.

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Bridging vascular physiology to vascular medicine: an integrative laboratory class

Heinrich

Bähring

Larena‐Avellaneda

et al. 2023

Advances in Physiology Education

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Vascular diseases of the legs are highly prevalent and constitute an important part of medical curricula. The understanding of these diseases relies on strongly interwoven aspects of vascular physiology and vascular medicine. We aimed to connect these within a horizontally integrated laboratory class on vascular physiology of the leg which was designed in a cooperation of the departments of physiology and vascular surgery. Conceptually, we applied examination techniques of vascular medicine to visualize physiological parameters which are altered by the most frequent diseases. This facilitates integrative discussions on malfunctions, trains diagnostical skills and bridges to vascular medicine. In four experiments, we use oscillometry and impedance venous occlusion plethysmography to address key aspects of the arterial and venous system of the legs: 1) arterial pulse wave, 2) arterial systolic blood pressure, 3) venous capacitance and venous outflow, 4) reactive hyperemia. Following the experiments, physiological vascular function, the associated diseases, their impact on the recorded parameters and diagnostic options are discussed. To allow reproduction, we describe the course structure and the experimental setup in detail. We present the experimental data of a cohort of medical students and document learning success and students' satisfaction. All experiments were feasible and provided robust data on physiologically and clinically relevant vascular functions. The activity was perceived positively by the students and lead to a substantial improvement of knowledge. With this work, we offer a template for reproduction or variation of a proven concept of horizontally integrated teaching of vascular physiology of the leg.

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Modelling Dynamically Re-Sizeable Electrodes (DRE) for Targeted Transcutaneous Measurements in Impedance Plethysmography

Abstract: This is the accepted version of the paper.This version of the publication may differ from the final published version.Permanent repository link: https://openaccess.city.ac.uk/id/eprint/23504/ Link to published version: http://dx.

Cited by 3 publications

References 30 publications

A Quadruple-Sweep Bioimpedance Sensing Method for Arterial Stenosis Detection

A Quadruple-Sweep Bioimpedance Sensing Method for Arterial Stenosis Detection

Noninvasive Continuous Blood Pressure Estimation From Pulse Transit Time: A Review of the Calibration Models

Bridging vascular physiology to vascular medicine: an integrative laboratory class

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