Browsing Electrical and Electronic Engineering by Author "O'Halloran, Martin"
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Adaptive artifact removal for selective multistatic microwave breast imaging signals
Elahi, Muhammad Adnan; Glavin, Martin; Jones, Edward; O'Halloran, Martin (Elsevier, 2017-02-01)Microwave imaging is one of the most promising alternative breast imaging modalities. Early-stage artifact removal is an important signal processing component of a microwave breast imaging system. In this paper, a monostatic ... -
An anatomically accurate dielectric profile of the porcine kidney
Salahuddin, Saqib; La Gioia, Alessandra; Shahzad, Atif; Elahi, Muhammad Adnan; Kumar, Arun; Kilroy, David; Porter, Emily; O'Halloran, Martin (IOP Publishing, 2018-02-26)Microwave ablation is a promising treatment for kidney cancer. Accurate knowledge of the dielectric properties of biological tissues is vital for quantifying the safety, reliability and accuracy of ablation, among other ... -
Anatomically and dielectrically realistic microwave head phantom with circulation and reconfigurable lesions
McDermott, Barry; Porter, Emily; Santorelli, Adam; Divilly, Brendan; Morris, Liam; Jones, Marggie; McGinley, Brian; O'Halloran, Martin (The Electromagnetics Academy, 2017)Phantoms provide valuable test platforms for developing medical devices. Solid materials in particular allow fabrication of stable and robust models. This paper presents a novel, anatomically realistic, multi-layered head ... -
Anthropomorphic calcaneus phantom for microwave bone imaging applications
Amin, Bilal; Shahzad, Atif; Kelly, Daniel; O'Halloran, Martin; Elahi, Adnan (Institute of Electrical and Electronics Engineers, 2020-10-09)Recent studies have found a significant dielectric contrast between healthy and osteoporotic human trabecular bones. This dielectric contrast can be exploited by microwave imaging for monitoring human bone health. The ... -
Brain haemorrhage detection using a SVM classifier with electrical impedance tomography measurement frames
McDermott, Barry; O'Halloran, Martin; Porter, Emily; Santorelli, Adam (Public Library of Science, 2018-07-12)Brain haemorrhages often require urgent treatment with a consequent need for quick and accurate diagnosis. Therefore, in this study, we investigate Support Vector Machine (SVM) classifiers for detecting brain haemorrhages ... -
Broadband dielectric properties of adrenal gland for accurate anatomical modelling in medical applications
Shahzad, Atif; Clausing, D.; Prakash, Punit; Dennedy, Michael C.; O'Halloran, Martin (IEEE, 2017-09-11)Dielectric properties of biological tissue are important in safety assessment and evaluation of novel medical imaging and therapeutic devices. This paper reports frequency dependent dielectric properties of adrenal tissue, ... -
Challenges of post-measurement histology for the dielectric characterisation of heterogeneous biological tissues
La Gioia, Alessandra; O'Halloran, Martin; Porter, Emily (MDPI, 2020-06-09)The dielectric properties of biological tissues are typically measured using the open-ended coaxial probe technique, which is based on the assumption that the tissue sample is homogeneous. Therefore, for heterogeneous ... -
Classification applied to brain haemorrhage detection: Initial phantom studies using electrical impedance measurements
McDermott, Barry; O'Halloran, Martin; Santorelli, Adam; McGinley, Brian; Porter, Emily (EIT2018, 2018-06-11)Machine learning and classification algorithms are applied to data collected from an EIT system. The system is used with an anatomically accurate head phantom setup in a variety of situations modelling normal and haemorrhagic ... -
Comparison of coaxial open-ended probe based dielectric measurements on ex-vivo thermally ablated liver tissue
Ruvio, Giuseppe; Farina, Laura; Bottiglieri, Anna; Eaton-Evans, Jimmy; Elahi, Muhamad Ednan; O'Halloran, Martin; Pinto, Rosanna; Lopresto, Vanni; Cavagnaro, Marta (Institute of Electrical and Electronics Engineers, 2019-03-31)This paper compares an in-house dielectric properties measurement system based on the "Stuchly and Stuchly" method with the broadly commercialised Keysight setup and existing literature for the characterization of ablated ... -
Comparison of in-vivo and ex-vivo dielectric properties of biological tissues
Salahuddin, Saqib; La Gioia, Alessandra; Elahi, Muhammad Adnan; O'Halloran, Martin; Shahzad, Atif (Curran Associates Proceedings, 2017-09-11)Accurate knowledge of the dielectric properties of biological tissues are crucial for various applications such as assessment of specific absorption rate and safety of electromagnetic medical devices. Most of the ... -
Comparison of radar-based microwave imaging algorithms applied to experimental breast phantoms
Elahi, Muhammad Adnan; Lavoie, B. R.; Porter, Emily; Glavin, Martin; Jones, E.; Fear, E. C.; O'Halloran, Martin (Union Radio-Scientifique Internationale, 2017-08-19)Microwave imaging is a promising imaging modality for the early detection of breast cancer. The two most important signal processing components of a radar-based microwave imaging system are the early-time artifact removal ... -
Dielectric characterization of diseased human trabecular bones at microwave frequency
Amin, Bilal; Shahzad, Atif; Farina, Laura; Parle, Eoin; McNamara, Laoise; O'Halloran, Martin; Elahi, Muhammad Adnan (Elsevier, 2020-02-07)The objective of this study is to determine whether in vitro dielectric properties of human trabecular bones, can distinguish between osteoporotic and osteoarthritis patients' bone samples. Specifically this study enlightens ... -
Dielectric characterization of ex vivo ovine and human adrenal glands for microwave thermal ablation applications
Bottiglieri, Anna; Shahzad, Atif; Donlon, Padraig; Dennedy, Micheal Conall; Lowery, Aoife; O'Halloran, Martin; Farina, Laura (Institute of Electrical and Electronics Engineers, 2021-01-15)Historically, adrenal glands diseases causing hypertension, such as Primary Aldosteronism (PA), have been treated through pharmacotherapy or surgical resection. Given the shortcomings of the available treatment options, ... -
Dielectric properties of bones: A potential indicator for osteoporosis
Amin, Bilal; Elahi, Muhammad Adnan; Porter, Emily; Shahzad, Atif; O'Halloran, Martin (National University of Ireland Galway, 2018-01-26)Osteoporosis is one of the major bone disease that results into bone fragility and fractures. Approximately 300,000 people over the age of 50 years suffer from osteoporosis in Ireland. Osteoporosis is mainly caused due ... -
Early-stage dielectric characterisation of renal cell carcinoma for positive surgical margin detection
La Gioia, Alessandra; Elahi, Adnan; Bottiglieri, Anna; Istuk, Niko; Dowling, Catherine; D'Arcy, Frank; O'Halloran, Martin; Porter, Emily (Institute of Electrical and Electronics Engineers, 2019-03-31)Partial nephrectomy is preferred to total nephrectomy tor clinically localised renal cell carcinoma. In order to minimise the risk of local tumour recurrence after partial nephrectomy, ideally, the surgical margins of the ... -
Effect of logarithmic and linear frequency scales on parametric modelling of tissue dielectric data
Salahuddin, Saqib; Porter, Emily; Meaney, Paul M.; O'Halloran, Martin (IOP Publishing, 2017-02-03)The dielectric properties of biological tissues have been studied widely over the past half-century. These properties are used in a vast array of applications, from determining the safety of wireless telecommunication ... -
Effects of standard coagulant agents on the dielectric properties of fresh human blood
Salahuddin, Saqib; O'Halloran, Martin; Porter, Emily; Farrugia, Lourdes; Bonello, Julian; Sammut, Charles V.; Wismayer, P. Schembri (Institute of Electrical and Electronics Engineers, 2017-11-27)In this paper, the effects of coagulation and temperature on the dielectric properties of human blood are investigated over the frequency range of 400 MHz - 20 GHz using freshly extracted blood samples. The dielectric ... -
Electrical impedance tomography with exploitation of symmetry
McDermott, Barry; Porter, Emily; Jones, Marggie; McGinley, Brian; O'Halloran, Martin (Bioengineering in Ireland 2018, 2018-01-26)Electrical Impedance Tomography (EIT) is an imaging technique involving an electrode array positioned around the area of interest. Alternating current is injected, and voltage measured, between electrode pairs in a prescribed ... -
Examination of the sensing radius of open-ended coaxial probes in dielectric measurements of biological tissues
La Gioia, Alessandra; Porter, Emily; O'Halloran, Martin (Institute of Electrical and Electronics Engineers, 2017-07-09)A number of emerging electromagnetic diagnostic and therapeutic devices are designed based on estimates of benign and malignant tissue dielectric properties at different frequencies and temperatures. Accurate tissue ... -
Experimental evaluation of the effective ablation zone on ex-vivo bovine liver samples
Bottiglieri, Anna; Elahi, Adnan; Shahzad, Atif; Donlon, Padraig T.; Dennedy, Michael C.; O'Halloran, Martin (IEEE, 2018-09-10)Microwave thermal ablation is under investigation for minimally invasive treatments. In the cases of small targets, such as adrenal glands, microwave thermal ablation is a valuable alternative to the traditional and ...