Niko Ištuk
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View article: Dielectric characterisation of human adrenal glands and adrenal tumours for the development of microwave ablation technologies for hypertension treatment
Dielectric characterisation of human adrenal glands and adrenal tumours for the development of microwave ablation technologies for hypertension treatment Open
Adrenal gland-induced hypertension results from underlying adrenal gland disorders including Conn's syndrome, Cushing's syndrome, and Pheochromocytoma. These adrenal disorders are a risk for cardiovascular and renal morbidity and mortality…
View article: Simple Steps to Characterise a Conductivity Measurement Probe for Bio-impedance Applications
Simple Steps to Characterise a Conductivity Measurement Probe for Bio-impedance Applications Open
Bio-impedance measurements require properly designed and characterised probes. Particular attention must be paid to the excitation signals and temperature compensation to meet the requirements of the linear sample response and the measurem…
View article: Design of a Tetrapolar Probe for Electrical Characterization of the Left Atrial Appendage From 0.1 Hz to 100 kHz
Design of a Tetrapolar Probe for Electrical Characterization of the Left Atrial Appendage From 0.1 Hz to 100 kHz Open
Recently, nonthermal pulsed field ablation using electroporation has generated a lot of interest as a potential treatment for atrial fibrillation (AF). The electrical properties, especially the conductivity of cardiac tissues, are used in …
View article: Probe Contact Force Monitoring during Conductivity Measurements of the Left Atrial Appendage to Support the Design of Novel Diagnostic and Therapeutic Procedures
Probe Contact Force Monitoring during Conductivity Measurements of the Left Atrial Appendage to Support the Design of Novel Diagnostic and Therapeutic Procedures Open
The electrical properties of many biological tissues are freely available from the INRC and the IT’IS databases. However, particularly in lower frequency ranges, few studies have investigated the optimal measurement protocol or the key con…
View article: Eliminating the geometric error in tissue conductivity measurements by increasing the sample size
Eliminating the geometric error in tissue conductivity measurements by increasing the sample size Open
In this study we simulated the tissue conductivity measurement with two-electrode probe in contact with the samples of different size. We found that after the sample reaches about twice the size of the probe, further increase in the size o…
View article: Human Blood Galvanostatic Impedance Data
Human Blood Galvanostatic Impedance Data Open
This file includes datasets from impedance measurements performed on human blood samples at National University of Ireland Galway in November 2020. The results of this experiments were published as: N. Istuk, A. L. Gioia, H. Benchakroun, A…
View article: Human Blood Galvanostatic Impedance Data
Human Blood Galvanostatic Impedance Data Open
This file includes datasets from impedance measurements performed on human blood samples at National University of Ireland Galway in November 2020. The results of this experiments were published as: N. Istuk, A. L. Gioia, H. Benchakroun, A…
View article: The Effect of Contact Pressure on Ex-vivo Measurements of the Conductivity of Liver
The Effect of Contact Pressure on Ex-vivo Measurements of the Conductivity of Liver Open
In this study we measured the electrical conductivity of bovine liver. The measurements were performed at frequencies from 10 Hz to 10 kHz (N=5 frequencies) using a custom four-electrode probe and a galvanostat. We examined how the pressur…
View article: Relationship Between the Conductivity of Human Blood and Blood Counts
Relationship Between the Conductivity of Human Blood and Blood Counts Open
Achieving a better characterization of human blood conductivity is of high relevance for medical applications. In this study we measured the complex impedance of N = 10 human whole blood samples (from N = 10 oncology patients) at room temp…
View article: Relationship Between the Conductivity of Human Blood and Blood Counts
Relationship Between the Conductivity of Human Blood and Blood Counts Open
Achieving a better characterization of human blood conductivity is of high relevance for medical applications. In this study we measured the complex impedance of N = 10 human whole blood samples (from N = 10 oncology patients) at room temp…
View article: Measurement of Electrical Conductivity of Human Blood at Frequencies Below 100 kHz with Four-electrode Probe Method
Measurement of Electrical Conductivity of Human Blood at Frequencies Below 100 kHz with Four-electrode Probe Method Open
Electrical conductivity of blood at low frequencies is fundamental for medical electromagnetic applications, such as pulsed field ablation of cardiac tissue. There are several studies in the literature reporting conductivity measurements o…
View article: Dielectric Properties Model of the Left Atrium and Left Atrial Appendage for Applications in Cardiac Ablation
Dielectric Properties Model of the Left Atrium and Left Atrial Appendage for Applications in Cardiac Ablation Open
Accurate dielectric models for cardiac tissue are key to the design of improved cardiac ablation devices. Historically, the heart has been largely treated as a homogeneous organ in a majority of dielectric studies. However, a recent study …
View article: Proceedings of the 21st International Conference on Biomedical Applications of Electrical Impedance Tomography
Proceedings of the 21st International Conference on Biomedical Applications of Electrical Impedance Tomography Open
Proceedings of the 21st International Conference on Biomedical Applications of Electrical Impedance Tomography Edited by Barry McDermott, Marcin J. Kraśny, Laura Farina, Niko Ištuk, Ana González-Suárez, Hamza Benchakroun, Alistair Boyle Th…
View article: Dielectric Properties of Ovine Heart at Microwave Frequencies
Dielectric Properties of Ovine Heart at Microwave Frequencies Open
Accurate knowledge of the dielectric properties of biological tissues is important in dosimetry studies and for medical diagnostic, monitoring and therapeutic technologies. In particular, the dielectric properties of the heart are used in …
View article: Changes in the Dielectric Properties of ex-vivo Ovine Kidney Before and After Microwave Thermal Ablation
Changes in the Dielectric Properties of ex-vivo Ovine Kidney Before and After Microwave Thermal Ablation Open
In this work, a comparison in terms of dielectric properties (i.e. relative permittivity and conductivity) between ablated and non-ablated kidney samples (N = 3) was conducted. Measurements before and after ablation (N = 54) were performed…
View article: Development of an Anthropomorphic Phantom of the Axillary Region for Microwave Imaging Assessment
Development of an Anthropomorphic Phantom of the Axillary Region for Microwave Imaging Assessment Open
We produced an anatomically and dielectrically realistic phantom of the axillary region to enable the experimental assessment of Axillary Lymph Node (ALN) imaging using microwave imaging technology. We segmented a thoracic Computed Tomogra…
View article: Changes in the Dielectric Properties of ex-vivo Ovine Kidney Before and After Microwave Thermal Ablation
Changes in the Dielectric Properties of ex-vivo Ovine Kidney Before and After Microwave Thermal Ablation Open
<p>In this work, a comparison in terms of dielectric properties (i.e. relative permittivity and conductivity) between ablated and non-ablated kidney samples (N = 3) was conducted. Measurements before and after ablation (N = 54) were …
View article: Dielectric Measurements of Ovine Heart
Dielectric Measurements of Ovine Heart Open
This file includes datasets from ex vivo dielectric properties measurements performed on four ovine hearts at National University of Ireland Galway in July 2019. The preliminary results of this experiment were to be presented at EuCAP 2020…
View article: Dielectric Measurements of Ovine Heart
Dielectric Measurements of Ovine Heart Open
This file includes datasets from ex vivo dielectric properties measurements performed on four ovine hearts at National University of Ireland Galway in July 2019. The preliminary results of this experiment were to be presented at EuCAP 2020…
View article: Detailed Dielectric Characterisation of the Heart and Great Vessels
Detailed Dielectric Characterisation of the Heart and Great Vessels Open
The dielectric properties of biological tissues play a significant role in the planning and development of electromagnetic thermal therapies. In most cases in the literature, heart is considered as a homogeneous organ and its dielectric pr…
View article: Fast Measurements of Dielectric Properties with Small Size Microwave Transceiver
Fast Measurements of Dielectric Properties with Small Size Microwave Transceiver Open
The dielectric properties of biological tissues are fundamental for the design of electromagnetic medical devices as well as in non-ionizing radiation dosimetry studies. In recent studies, dielectric data has been typically collected using…
View article: Current Directions in the Auricular Vagus Nerve Stimulation I – A Physiological Perspective
Current Directions in the Auricular Vagus Nerve Stimulation I – A Physiological Perspective Open
Electrical stimulation of the auricular vagus nerve (aVNS) is an emerging technology in the field of bioelectronic medicine with applications in therapy. Modulation of the afferent vagus nerve affects a large number of physiological proces…
View article: Current Directions in the Auricular Vagus Nerve Stimulation II – An Engineering Perspective
Current Directions in the Auricular Vagus Nerve Stimulation II – An Engineering Perspective Open
Electrical stimulation of the auricular vagus nerve (aVNS) is an emerging electroceutical technology in the field of bioelectronic medicine with applications in therapy. Artificial modulation of the afferent vagus nerve - a powerful entran…
View article: Early-stage Dielectric Characterisation of Renal Cell Carcinoma for Positive Surgical Margin Detection
Early-stage Dielectric Characterisation of Renal Cell Carcinoma for Positive Surgical Margin Detection Open
Partial nephrectomy is preferred to total nephrectomy for clinically localised renal cell carcinoma. Currently, the risk of positive margins during partial nephrectomy is minimised with the use of intraoperative ultrasound. In this study, …