PERE JOAN RIU COSTA

Scopus Publications

Machine learning allows robust classification of lung neoplasm tissue using an electronic biopsy through minimally-invasive electrical impedance spectroscopy
Georgina Company-Se, Virginia Pajares, Albert Rafecas-Codern, Pere J. Riu, Javier Rosell-Ferrer, Ramon Bragós, Lexa Nescolarde
Scientific Reports, 2025
New bronchoscopy techniques like radial probe endobronchial ultrasound have been developed for real-time sampling characterization, but their use is still limited. This study aims to use classification algorithms with minimally invasive electrical impedance spectroscopy to improve neoplastic lung tissue identification during biopsies. Decision Tree, Support Vector Machines (SVM), Ensemble Method, K-Nearest Neighbors, Naïve Bayes and Discriminant Analysis were applied using mean averaged bioimpedance modulus and phase angle spectra from lung tissue across 15 frequencies (15-307 kHz). Mann-Whitney U test assessed statistical significance between neoplasm and other tissues. Grid search analysis was conducted to determine the optimal hyperparameter configuration for each model, employing a 5-fold cross-validation approach. Model performance was evaluated using Receiver Operating Characteristic curves, with the Area Under Curve (AUC), precision, recall, and F1-score calculated. All the frequencies used to train and test the algorithms obtained high significant differences between neoplasm and the other types of tissues (P < 0.001). All the algorithms implemented obtained an accuracy, AUC and F1-score above the 95% except for Naïve Bayes. Decision Tree, Discriminant Analysis and SVM algorithms are suitable for the implementation of a new low-cost guidance method during bronchoscopy.
Minimally-invasive electrical impedance spectroscopy in lung tissue: present and future trends
Pere J. Riu, Georgina Company-Se, Albert Rafecas Codern, Anna Farrés Castany, Virginia Pajares, Javier Rosell, Ramon Bragós, Lexa Nescolarde
Journal of Physics Conference Series, 2025
Electrical impedance measurements performed in-vivo and in-situ in lung tissue so far have focused on detecting different pathologies, including neoplasm. Once its ability for this has been established, the authors intend to investigate whether it is possible to detect peripheral lung nodules. The preliminary measurements collected show differences in the measured spectra and model parameters between the different types of lesions collected (solid nodules, partially solid nodules and ground-glass nodules).
Feasibility of Electrical Impedance Spectroscopy for Tissue Differentiation in Peripheral Solitary Pulmonary Nodules and Masses
Lexa Nescolarde, Georgina Company-Se, Albert Rafecas, Anna Farrés-Castany, Virginia Pajares, Javier Rosell, Pere J. Riu, Ramon Bragós
Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society EMBS, 2025
This study evaluates the feasibility of Electrical Impedance Spectroscopy (EIS) as a minimally invasive technique to differentiate healthy lung tissue from peripheral pulmonary nodules and masses during Electromagnetic Navigation Bronchoscopy (ENB). The diagnostic capability of EIS is also assessed in distinguishing malignant from benign lesions. Significant differences (P < 0.001) were observed between healthy tissue and lesions in all impedance parameters (resistance, reactance, modulus, and phase angle). Differences between benign and malignant nodules and masses were observed in the complex plane plot, but some overlap between both occurred possibly due to similarities between adenocarcinomas and inflammatory nodules, primarily in terms of water content. The findings suggest that EIS could be implemented as a potential tool to improve biopsy guidance, reducing the need for additional X-ray imaging during the procedure. In addition, increasing sample size is needed to enhance diagnostic accuracy.Clinical RelevanceElectrical Impedance Spectroscopy (EIS) has proven to be an effective tool for distinguishing healthy lung tissue from peripheral lung nodules and masses. Using this technique for guiding the biopsy localization could lead to an improved diagnostic yield while reducing dependence on ionizing radiation-based imaging, such as X-rays.
Differentiation using minimally-invasive bioimpedance measurements of healthy and pathological lung tissue through bronchoscopy
Georgina Company-Se, Lexa Nescolarde, Virginia Pajares, Alfons Torrego, Pere J. Riu, Javier Rosell, Ramon Bragós
Frontiers in Medicine, 2023
PurposeTo use minimally-invasive transcatheter electrical impedance spectroscopy measurements for tissue differentiation among healthy lung tissue and pathologic lung tissue from patients with different respiratory diseases (neoplasm, fibrosis, pneumonia and emphysema) to complement the diagnosis at real time during bronchoscopic procedures.MethodsMulti-frequency bioimpedance measurements were performed in 102 patients. The two most discriminative frequencies for impedance modulus (|Z|), phase angle (PA), resistance (R) and reactance (Xc) were selected based on the maximum mean pair-wise Euclidean distances between paired groups. One-way ANOVA for parametric variables and Kruskal–Wallis for non-parametric data tests have been performed with post-hoc tests. Discriminant analysis has also been performed to find a linear combination of features to separate among tissue groups.ResultsWe found statistically significant differences for all the parameters between: neoplasm and pneumonia (p &lt; 0.05); neoplasm and healthy lung tissue (p &lt; 0.001); neoplasm and emphysema (p &lt; 0.001); fibrosis and healthy lung tissue (p ≤ 0.001) and pneumonia and healthy lung tissue (p &lt; 0.01). For fibrosis and emphysema (p &lt; 0.05) only in |Z|, R and Xc; and between pneumonia and emphysema (p &lt; 0.05) only in |Z| and R. No statistically significant differences (p &gt; 0.05) are found between neoplasm and fibrosis; fibrosis and pneumonia; and between healthy lung tissue and emphysema.ConclusionThe application of minimally-invasive electrical impedance spectroscopy measurements in lung tissue have proven to be useful for tissue differentiation between those pathologies that leads increased tissue and inflammatory cells and those ones that contain more air and destruction of alveolar septa, which could help clinicians to improve diagnosis.
Relaxation differences using EIS through bronchoscopy of healthy and pathological lung tissue
Georgina Company-Se, Lexa Nescolarde, Virginia Pajares, Alfons Torrego, Albert Rafecas, Javier Rosell, Pere J. Riu, Ramon Bragós
Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society EMBS, 2023
The use of electrical impedance spectroscopy for lung tissue differentiation is an opportunity for the improvement of clinical diagnosis. The aim of this work is to distinguish among different lung tissue states by evaluating the differences among impedance spectrum parameters between two separate frequencies (15 kHz and 307 kHz) in the beta dispersion region. In previous studies we have used single frequency measurements for tissue differentiation. Differences (P < 0.05) are found between those tissues that undergo an increase in tissue density (neoplasm and fibrosis) and those tissues that lead to tissue destruction (emphysema). Electrical impedance spectroscopy shows its utility for lung tissue differentiation for diagnosis improvement among pathologies with different tissue structure. Further studies are necessary for the differentiation among those tissue states that are more similar to each other.Clinical Relevance- Expand the diagnostic tools currently available in bronchoscopy by using minimally-invasive bioimpedance measurements to differentiate between lung patterns.
Minimally Invasive Lung Tissue Differentiation Using Electrical Impedance Spectroscopy: A Comparison of the 3- and 4-Electrode Methods
Georgina Company-Se, Lexa Nescolarde, Virginia Pajares, Alfons Torrego, Pere J. Riu, Javier Rosell, Ramon Bragos
IEEE Access, 2022
Multiple imaging techniques are used for the diagnosis of lung diseases. The choice of a technique depends on the suspected diagnosis. Computed tomography (CT) of the thorax and positron emission tomography (PET) are imaging techniques used for the detection, characterization, staging and follow-up of lung cancer, and these techniques use ionizing radiation and are radiologist-dependent. Electrical impedance spectroscopy (EIS) performed through a bronchoscopic process could serve as a minimally invasive non-ionizing method complementary to CT and PET to characterize lung tissue. The aim of this study was to analyse the feasibility and ability of minimally invasive EIS bioimpedance measures to differentiate among healthy lung, bronchial and neoplastic lung tissues through bronchoscopy using the 3- and 4-electrode methods. Tissue differentiation was performed in 13 patients using the 4-electrode method (13 healthy lung, 12 bronchial and 3 neoplastic lung tissues) and the 3-electrode method (9 healthy lung, 10 bronchial and 2 neoplastic lung tissues). One-way analysis of variance (ANOVA) showed a statistically significant difference (P < 0.001) between bronchial and healthy lung tissues for both the 3- and 4-electrode methods. The 3-electrode method seemed to differentiate cancer types through changes in the cellular structures of the tissues by both the reactance (Xc) and the resistance (R). Minimally invasive measurements obtained using the 3-electrode method seem to be most suitable for differentiating between healthy and bronchial lung tissues. In the future, EIS using the 3-electrode method could be a method complementary to PET/CT and biopsy in lung pathology diagnosis.
Effect of Calibration for Tissue Differentiation Between Healthy and Neoplasm Lung Using Minimally Invasive Electrical Impedance Spectroscopy
Georgina Company-Se, Lexa Nescolarde, Virginia Pajares, Alfons Torrego, Pere J. Riu, Javier Rosell, Ramon Bragos
IEEE Access, 2022
This study proposes a calibration method and analyses the effect of this calibration in lung measures, using minimally invasive electrical impedance spectroscopy with the 3-electrode method, for tissue differentiation between healthy and neoplasm lung tissue. Tissue measurements were performed in 99 patients [54 healthy tissue and 15 neoplastic tissue samples obtained] with an indicated bronchoscopy. Statistically significant difference (P < 0.001) were found between healthy lung tissue and neoplasm lung tissue in bioimpedance parameters. The calibration of the bioimpedance measures with respect to a measure performed in bronchi reduces the inter-patient dispersion, increasing the sensitivity, decreasing the specificity and increasing the area below the ROC curve for three out of four impedance-derived estimators. Results also show that there are no significant differences between healthy lung tissue among smoker, non-smoker and ex-smoker samples, which was initially stated as a possible cause of EIS measurement dispersion in lungs.
Minimally Invasive Real-Time Electrical Impedance Spectroscopy Diagnostic Tool for Lung Parenchyma Pathologies
Pere J Riu, Georgina Company, Ramon Bragos, Javier Rosell, Virginia Pajares, Alfons Torrego
Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society EMBS, 2020
Electrical Impedance Spectroscopy has already demonstrated the ability to distinguish different tissues types, or tumors from normal tissue, or tissues displaying diverse degrees of pathology. When applying the technique, however, the necessity to make contact with the tissue often constitutes a practical limitation. Electrical Impedance Imaging (EIT), or in a broader sense, regional impedance assessment, struggle to assess different tissue conditions out of measurements from the surface of the body. But sensitivity is very small even for tissue a few centimeters under the skin, and in-vivo measurements are often not viable.The lung offer a third approximation by introducing a catheter though a bronchoscope, which is a routine clinical procedure. Measurements have been obtained by using 3 or 4-electrode techniques and allow us to distinguish, at least, fibrotic, emphysema or neoplastic regions from normal parenchyma. New instrumental developments, clinical measurements and preliminary results are presented and discussed.
Electrical impedance signal analysis for medical diagnosis
Francisco Miguel Vargas Luna, Marco Balleza-Ordaz, María Raquel Huerta Franco, Pere Riu
Bioimpedance in Biomedical Applications and Research, 2018
Numerical assessment in aeronautics for electromagnetic environmental effects
Miguel David Ruiz-Cabello Nuñez, Sergio Fernández Romero, Marc Pous, Enrique Pascual Gil, Luis M. Diaz Angulo, David Poyatos Martínez, Mireya Fernández Chimeno, Guadalupe G. Gutierrez, Amelia Rubio Bretones, Manuel Añon Cancela, Ferran Silva, Jesus Alvarez, Mario Fernández Pantoja, Borja Plaza Gallardo, Luis Nuño, Rafael Gómez Martín, David Escot Bocanegra, Pere J. Riu, Rafael Trallero, Ricardo Jauregui Telleria, Salvador G. Garcia
Electromagnetic Compatibility for Space Systems Design, 2018
Electrical and electronic systems on board air vehicles are susceptible to electromagnetic interference (EMI). This has made the topic of electromagnetic compatibility (EMC), a major concern for aircraft safety. The use of composite materials worsens this situation, for their poor shielding and low conductive capabilities. Some of the main experimental E3 certification scenarios used in aeronautics are revisited in this chapter. Guidelines to achieve simple, yet accurate, numerical models of them are provided, with appropriate tradeoffs between computational simplicity and accuracy. The numerical method, endowed with extended capabilities, has been chosen for this task for its ability and efficiency to deal with complex problems of arbitrary materials. The feature selective validation (FSV) IEEE standard procedure, commonly used to quantify the comparison of data in electromagnetic problems, is also revisited. The simulation of three different air vehicles in several certification scenarios is finally described and the numerical results compared to experimental data.
SIVA UAV: A Case Study for the EMC Analysis of Composite Air Vehicles
Miguel R. Cabello, Sergio Fernandez, Marc Pous, Enrique Pascual-Gil, Luis D. Angulo, Patricia Lopez, Pere J. Riu, Guadalupe G. Gutierrez, Daniel Mateos, David Poyatos, Mireya Fernandez, Jesus Alvarez, Mario F. Pantoja, Manuel Anon, Ferran Silva, Amelia R. Bretones, Rafael Trallero, Luis Nuno, David Escot, Rafael G. Martin, Salvador G. Garcia
IEEE Transactions on Electromagnetic Compatibility, 2017
UAVEMI project: Numerical and experimental em immunity assessment of UAV for HIRF and lightning indirect effects
Salvador G. Garcia, Ferran Silva, David Escot, Enrique Pascual, Mario F. Pantoja, Pere Riu, Manuel Anon, Jesus Alvarez, M. Cabello, Marc Pous, Sergio Fernandez, Rafael Trallero, David Poyatos, Luis Nuno
Proceedings of 2016 ESA Workshop on Aerospace EMC Aerospace EMC 2016, 2016
In vivo electrical bioimpedance characterization of human lung tissue during the bronchoscopy procedure. A feasibility study
Benjamin Sanchez, Gerd Vandersteen, Irene Martin, Diego Castillo, Alfons Torrego, Pere J. Riu, Johan Schoukens, Ramon Bragos
Medical Engineering and Physics, 2013
Minimally invasive in vivo human lung tissue bioimpedance measurements during the bronchoscopy procedure
B. Sanchez, G. Vandersteen, I. Martin, D. Castillo, A. Torrego, P. J. Riu, J. Schoukens, R. Bragos
Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society EMBS, 2012
Electrical impedance tomography in acute lung injury
J. Riera, P.J. Riu, P. Casan, J.R. Masclans
Medicina Intensiva, 2011
Monitoring body fluid shifts during haemodialysis (HD) using electrical bioimpedance measurments
Omar. I. Al-Surkhi, P. J. Riu, Michel Y. Jaffrin
2011 1st Middle East Conference on Biomedical Engineering Mecbme 2011, 2011
Transient FDTD simulation validation
Ricardo Jauregui, Pere J. Riu, Ferran Silva
IEEE International Symposium on Electromagnetic Compatibility, 2010
Common mode feedback analysis for EIT systems with distributed current sources
D Anton, P J Riu
Journal of Physics Conference Series, 2010
Performance assessment of EIT measurement systems
P J Riu, D Anton
Journal of Physics Conference Series, 2010
Tidal volume (TV) post-process obtained with electrical impedance tomography on a group of chronic obstructive pulmonary disease (COPD) patients. Use of adjust equations
Marco Balleza, Daniel Anton, Pere Casan, Pere Riu
Journal of Physics Conference Series, 2010
Power Line Impedance Characterization of Automotive Loads at the Power Line Communication Frequency Range
Marc Aragón, Mauricio Salinas, Pere J. Riu, Ferran Silva
9th International Symposium on EMC Joint with 20th International Wroclaw Symposium on EMC EMC Europe 2010, 2010
Car windshield behavior transient analysis by FDTD
R. Jauregui, M. Pous, Y. Vives, M. Fernandez, P. J. Riu, F. Silva
2009 International Symposium on Electromagnetic Compatibility EMC Europe, 2009
Tidal volume monitoring with Electrical Impedance Tomography (EIT) on COPD patients. Relationship between EIT and diffusion lung transfer (DL,CO)
M. Balleza, P. Casan, P. J. Riu
Ifmbe Proceedings, 2009
Car windshield behavior transient analysis by FDTD
R. Jauregui, M. Pous, Y. Vives, M. Fernandez, P. J. Riu, F. Silva
EMC Europe 2009 Workshop EMC 2009 Proceedings, 2009
Measuring Breathing Pattern in Patients With Chronic Obstructive Pulmonary Disease by Electrical Impedance Tomography
Marco Balleza, Núria Calaf, Teresa Feixas, Mercedes González, Daniel Antón, Pere J. Riu, Pere Casan
Archivos De Bronconeumologia, 2009
Monitoring fluid shifts during haemodialysis using local tissue bioimpedance measurement
Omar. I. Al-Surkhi, P. J. Riu, F. Vazquez, J. Ibeas
Ifmbe Proceedings, 2008
Ventilatory pattern monitoring by electrical impedance tomography (EIT) in chronic obstructive pulmonary disease (COPD) patients
José Marco Balleza Ordaz, Teresa Feixas, Nuria Calaf, Mercedes González, Daniel Antón, Pere J. Riu, Pere Casan
Ifmbe Proceedings, 2008
Continuous oxygen consumption estimation method for animal cell bioreactors based on a low-cost control of the medium dissolved oxygen concentration
A. Fontova, A. Soley, J. Gálvez, E. Sarró, M. Lecina, J. Rosell, P. J. Riu, J. Cairó, F. Gòdia, R. Bragos
Ifmbe Proceedings, 2008
A near-field probe for in situ EMI measurements of industrial installations
M. Quilez, M. Aragon, A. Atienza, M. Fernandez-Chimeno, P.J. Riu, F. Silva
IEEE Transactions on Electromagnetic Compatibility, 2008
Indicator for hydration balance during haemodialysis based on anisotropic FEM
M Freiberger, P Brunner, M Mayer, O I Surkhi, P J Riu, H Scharfetter
Physiological Measurement, 2008
Current Source Design for Electrical Bioimpedance Spectroscopy
Fernando Seoane, Ramón Bragos, Kaj Lindecrantz, Pere Riu
Encyclopedia of Healthcare Information Systems Volume 1 3, 2008
Validation of low-level, high-frequency transient FDTD simulation with radiated field measurements
Ricardo Jauregui, Marc Pous, Mireya Fernandez, Pere J. Riu, Ferran Silva
IEEE International Symposium on Electromagnetic Compatibility, 2008
Assessment of differential lung function by electrical impedance tomography
J. Bruno de Lema, Ernesto Serrano, Teresa Feixas, Núria Calaf, María del Valle Camacho, Pere J. Riu, Pere Casan
Archivos De Bronconeumologia, 2008
Implantable bioimpedance system for measuring the impedance of kidney
Ifmbe Proceedings, 2007
Transient electromagnetic field computation in automotive environments using FDTD
Pere J. Riu, Ricardo Jauregui, Ferran Silva, Mireya Fernandez
IEEE International Symposium on Electromagnetic Compatibility, 2007
Monitoring Cole-Cole parameters during haemodialysis (HD)
Omar. I. Al-Surkhi, P. J. Riu, F. F. Vazquez, J. Ibeas
Annual International Conference of the IEEE Engineering in Medicine and Biology Proceedings, 2007
Changes in the arm bioimpedance with applied pressure and force
Ifmbe Proceedings, 2007
Tidal volume monitoring with electrical impedance tomography. Validation for healthy subjects
Ifmbe Proceedings, 2007
Thermal diagnostics front-end electronics for LISA Pathfinder
J. Sanjuán, A. Lobo, M. Nofrarias, J. Ramos-Castro, P. J. Riu
Review of Scientific Instruments, 2007
Initial analysis of SAR from a cell phone inside a vehicle by numerical computation
G. Anzaldi, F. Silva, M. Fernandez, M. Quilez, P.J. Riu
IEEE Transactions on Biomedical Engineering, 2007
Estimation of fluid volume changes during haemodialysis with an anisotropic finite element model
M. Freiberger, P. Brunner, M. Mayer, O.I. Surkhi, P.J. Riu, Hermann Scharfetter
Ifmbe Proceedings, 2007
A compact EIT system for ventilation monitoring in COPD patients
D. Anton, M. Balleza, J. Fornos, B. Kos, P. Casan, P.J. Riu
Ifmbe Proceedings, 2007
Viable biomass probe for a life support system bioreactor
R. Bragós, J. Mas, J. Sevilla, T. López, P. Riu, J. Rosell
Ifmbe Proceedings, 2007
Local tissue bioimpedance measurement for fluid shifts during haemodialysis
Omar I. Al-Surkhi, P.J. Riu, F. Vazquez, J. Mas, A. Rodriguez-Jornet, M. García, J. Ibeas
Ifmbe Proceedings, 2007
Monitoring of breathing pattern at rest by electrical impedance tomography
Marco Balleza, Jaume Fornos, Núria Calaf, Teresa Feixas, Mercedes González, Daniel Antón, Pere Riu, Pere Casan
Archivos De Bronconeumologia, 2007
Multiple automated minibioreactor system for multifunctional screening in biotechnology
A. Fontova, A. Soley, J. Galvez, E. Sarro, M. Lecina, J. Rosell, P. Riu, J. Cairo, F. Godia, R. Bragos
Annual International Conference of the IEEE Engineering in Medicine and Biology Proceedings, 2006
Electrical impedance tomography: Standardizing the procedure in pneumology
Bruno de Lema, Pere Casana, Pere Riu
Archivos De Bronconeumologia, 2006
TRANSIENT RADIATED FIELDS IN 14/42V POWERNET SYSTEMS. FDTD ASSESSMENT
P. J. Riu, R. Jauregui, S. Verdaguer, R. Santos, F. Silva
EMC Europe 2006 Barcelona International Symposium on Electromagnetic Compatibility, 2006
EM Field level measurement system using a new RMS detector intended for BTS Monitoring
L. Derousseau, C. Alonso, E. Cid, P. Riu, D. Belmonte
EMC Europe 2006 Barcelona International Symposium on Electromagnetic Compatibility, 2006
On-line monitoring of yeast cell growth by impedance spectroscopy
A. Soley, M. Lecina, X. Gámez, J.J. Cairó, P. Riu, X. Rosell, R. Bragós, F. Gòdia
Journal of Biotechnology, 2005
FDTD Analysis of SAR from a Cell Phone Inside a Vehicle
Gabriel Anzaldi, Eduard Canela Delgado, Pere J. Riu, Ferran Silva
Proceedings of the 16th International Zurich Symposium on Electromagnetic Compatibility EMC 2005, 2005
Remotely accessible laboratory for instrumentation and sensors
Conference Record IEEE Instrumentation and Measurement Technology Conference, 2004
Finite difference time domain low cost modeling for automotive environments
IEEE International Symposium on Electromagnetic Compatibility, 2004
Semi-distance Learning vs. Traditional Organisation for a Master's Degree in Electronic Engineering: An Experience at the Technical University of Catalonia (UPC), Spain
International Journal of Engineering Education, 2004
Comments on "Bioelectrical Parameters of the Whole Human Body Obtained through Bioelectrical Impedance Analysis"
Pere J. Riu
Bioelectromagnetics, 2004
Assessment of the unilateral pulmonary function by means of electrical impedance tomography using a reduced electrode set
Roberto E Serrano, Pere J Riu, Bruno de Lema, Pere Casan
Physiological Measurement, 2004
Green hams electrical impedance spectroscopy (EIS) measures and pastiness prediction of dry cured hams
Luis Guerrero, Idoia Gobantes, Ma Àngels Oliver, Jacint Arnau, M. Dolors Guàrdia, Jordi Elvira, Pere Riu, Narcı́s Grèbol, Josep Ma Monfort
Meat Science, 2004
Bioelectrical Impedance Vector Analysis in COPD Patients
Annual International Conference of the IEEE Engineering in Medicine and Biology Proceedings, 2003
A LOW-COST ANALOG FIBER OPTIC LINK FOR EMC APPLICATIONS
Francese J. Sánchez, Pere J. Riu, Marcos Quílez, Ferran Silva
15th International Zurich Symposium and Technical Exhibition on Electromagnetic Compatibility EMC 2003, 2003
On-line monitoring of microbial cell concentration in fermentation production of CAVA
Jordi Elvira, Josep Maria Buldón, Albert Tomàs, Josep Bujan, Pilar Urpí, Ramon Bragós, Pere Riu, Javier Rosell
SAE Technical Papers, 2003
Propagation of measurement noise through backprojection reconstruction in electrical impedance tomography
A.R. Frangi, P.J. Riu, J. Rosell, M.A. Viergever
IEEE Transactions on Medical Imaging, 2002
Sensitivity maps for low-contrast perturbations within conducting background in magnetic induction tomography
Hermann Scharfetter, Pere Riu, Marcos Populo, Javier Rosell
Physiological Measurement, 2002
Set-Up Role in Electrosurgical Unit Near Field EMI Measurements
Mireya Fernández, Jordi Escoda, Marcos Quílez, Pere Riu, Ferran Silva
International Symposium on Electromagnetic Compatibility 2002 EMC Europe Sorrento, 2002
42 v Automobile EMI Measurements
Salvador Verdaguer, Marcos Quílez, Mireya Fernández, Pere Riu, Ferran Silva
International Symposium on Electromagnetic Compatibility 2002 EMC Europe Sorrento, 2002
Use of electrical impedance tomography (EIT) for the assessment of unilateral pulmonary function
Roberto E Serrano, Bruno de Lema, Oscar Casas, Teresa Feixas, Nuria Calaf, Valle Camacho, Ignasi Carrió, Pere Casan, J Sanchis, Pere J Riu
Physiological Measurement, 2002
Evaluation of the electrical impedance spectroscopy (EIS) equipment for ham meat quality selection
M.Àngels Oliver, Idoia Gobantes, Jacint Arnau, Jordi Elvira, Pere Riu, Narcı́s Grèbol, Josep M. Monfort
Meat Science, 2001
Algorithms for parametric images in MEIT systems
O Casas, R Bragós, P J Riu, J Rosell
Physiological Measurement, 2000
Heating of tissue by near-field exposure to a dipole: A model analysis
P.J. Riu, K.R. Foster
IEEE Transactions on Biomedical Engineering, 1999
Tenth International Conference on Electrical Bio-Impedance, Barcelona, Spain, April 5-9 1998: Preface
Pere J. Riu
Annals of the New York Academy of Sciences, 1999
Practical limits of the Kramers-Kronig relationships applied to experimental bioimpedance data
PERE J. RIU, CRISTINA LAPAZ
Annals of the New York Academy of Sciences, 1999
Biomass monitoring using impedance spectroscopy
R. BRAGOS, X. GÁMEZ, J. CAIRÓ, P. J. RIU, F. GÒDIA
Annals of the New York Academy of Sciences, 1999
EMI from an automotive CAN bus
F. Silva, M. Quilez, J. Llop, X. Torres, P. Riu
IEEE International Symposium on Electromagnetic Compatibility, 1999
Radiation pattern of a PCB based probe intended for near field measurements
M. Quilez, F. Silva, A. Martin, J. Fontanilles, P. Riu
IEEE International Symposium on Electromagnetic Compatibility, 1999
In vivo and in situ ischemic tissue characterization using electrical impedance spectroscopy
O. CASAS, R. BRAGÓS, P. J. RIU, J. ROSELL, M. TRESÀNCHEZ, M. WARREN, A. RODRIGUEZ‐SINOVAS, A. CARREÑO, J. CINCA
Annals of the New York Academy of Sciences, 1999
LOW COST OPTICAL LINK TO MONITOR EUT'S SUSCEPTIBILITY TESTS
Marcos Quilez, Ferran Silva, Pere Riu
14th International Wroclaw Symposium and Exhibition on Electromagnetic Compatibility 1998 EMC 1998, 1998
Heating of Tissues by Microwaves: A Model Analysis
Kenneth R. Foster, Albert Lozano-Nieto, Pere J. Riu, Thomas S. Ely
Bioelectromagnetics, 1998
Low-cost near-field probe for simultaneous E and H measurement with analog optical link
IEEE International Symposium on Electromagnetic Compatibility, 1997
A Thermal Model for Human Thresholds of Microwave-Evoked Warmth Sensations
Bioelectromagnetics, 1997
Quantification improvement in EIT reconstruction algorithms by incorporating a priori geometrical information
Annual International Conference of the IEEE Engineering in Medicine and Biology Proceedings, 1996
Education in instrumentation: some questions and answers
IEE Colloquium Digest, 1996
Education in instrumentation: Some questions and answers
IEE Colloquium Digest, 1996
Changes in myocardial impedance spectrum during acute ischemia in the in-situ pig heart
Annual International Conference of the IEEE Engineering in Medicine and Biology Proceedings, 1996
Electrical impedance tomography of the eye: In vitro measurements of the cornea and the lens
I Jürgens, J Rosell, P J Riu
Physiological Measurement, 1996
Broadband quasi-differential multifrequency electrical impedance imaging system
P J Riu, R Bragós, J Rosell
Physiological Measurement, 1996
A parallel broadband real-time system for electrical impedance tomography
O Casas, J Rosell, R Bragós, A Lozano, P J Riu
Physiological Measurement, 1996
Quantification in multifrequency tomography
R Povill, P Riu
Physiological Measurement, 1995
Multi-frequency static imaging in electrical impedance tomography: Part 1 instrumentation requirements
P. J. Riu, J. Rosell, A. Lozano, R. Pallà-Areny
Medical Biological Engineering Computing, 1995
Comparison of current measurement structures in voltage-driven tomographic systems
IEE Colloquium Digest, 1995
Control of biological life support systems: Development of non-invasive, direct monitoring of free and immobilised biomass concentration in a bioreactor
J. Elvira, F. Gòdia, J. Cairó, J. L. Montesinos, P. Riu, R. Bragós, C. Tamponnet
SAE Technical Papers, 1995
A wide-band AC-coupled current source for electrical impedance tomography
R Bragos, J Rosell, P Riu
Physiological Measurement, 1994
Bio-impedance active electrode for in vivo measurement
P. M. Record, X. Rosell, B. Rigaud, P. J. Costa i Riu
Medical Biological Engineering Computing, 1994
Common-mode Feedback in Electrical Impedance Tomography
Javier Rosell, Pere Riu
Clinical Physics and Physiological Measurement, 1992
A Broadband System for Multifrequency Static Imaging in Electrical Impedance Tomography
Pere J Riu, Javier Rosell, Albert Lozano, Ramon Pallàs-Areny
Clinical Physics and Physiological Measurement, 1992
In vivo static imaging for the real and the reactive parts in electrical impedance tomography using multifrequency techniques
Pere Riu, Javier Rosell, Ramon Pallas-Areny
Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society EMBS, 1992
Parallel data acquisition system for electrical impedance tomography
Annual International Conference of the IEEE Engineering in Medicine and Biology Proceedings, 1989
Skin Impedance From 1 Hz to 1 MHz
J. Rosell, J. Colominas, P. Riu, R. Pallas-Areny, J.G. Webster
IEEE Transactions on Biomedical Engineering, 1988

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