Graphic summary
  • Show / hide key
  • Information


Scientific and technological production
  •  

1 to 50 of 249 results
  • In vivo electrical bioimpedance characterization of human lung tissue during the bronchoscopy procedure. A feasibility study

     Sánchez Terrones, Benjamín; Vandersteen, Gerd; Martín Robles, Irene; Castillo Villegas, Diego; Torrego Fernández, Alfons; Riu Costa, Pere Joan; Schoukens, Johan; Bragos Bardia, Ramon
    Medical engineering and physics
    Date of publication: 2013-07
    Journal article

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    Lung biopsies form the basis for the diagnosis of lung cancer. However, in a significant number of cases bronchoscopic lung biopsies fail to provide useful information, especially in diffuse lung disease, so more aggressive procedures are required. Success could be improved using a guided electronic biopsy based on multisine electrical impedance spectroscopy (EIS), a technique which is evaluated in this paper. The theoretical basis of the measurement method and the instrument developed are described, characterized and calibrated while the performance of the instrument is assessed by experiments to evaluate the noise and nonlinear source of errors from measurements on phantoms. Additional preliminary results are included to demonstrate that it is both feasible and safe to monitor in vivo human lung tissue electrical bioimpedance (EBI) during the bronchoscopy procedure. The time required for performing bronchoscopy is not extended because the bioimpedance measurements, present no complications, tolerance problems or side effects among any of the patients measured.

    Lung biopsies form the basis for the diagnosis of lung cancer. However, in a significant number of cases bronchoscopic lung biopsies fail to provide useful information, especially in diffuse lung disease, so more aggressive procedures are required. Success could be improved using a guided electronic biopsy based on multisine electrical impedance spectroscopy (EIS), a technique which is evaluated in this paper. The theoretical basis of the measurement method and the instrument developed are described, characterized and calibrated while the performance of the instrument is assessed by experiments to evaluate the noise and nonlinear source of errors from measurements on phantoms. Additional preliminary results are included to demonstrate that it is both feasible and safe to monitor in vivo human lung tissue electrical bioimpedance (EBI) during the bronchoscopy procedure. The time required for performing bronchoscopy is not extended because the bioimpedance measurements, present no complications, tolerance problems or side effects among any of the patients measured.

  • Nanomaterials based microarray platforms for biodetection

     Morales Narvaez, Eden
    Defense's date: 2013-07-24
    Universitat Politècnica de Catalunya
    Theses

     Share Reference managers Reference managers Open in new window

  • Minimally invasive in vivo human lung tissue bioimpedance measurements during the bronchoscopy procedure

     Sánchez, Benjamín; Vandersteen, Gerd; Martin, I.; Castillo, David; Torrego, A.; Riu Costa, Pere Joan; Schoukens, Johan; Bragos Bardia, Ramon
    IEEE Engineering in Medicine and Biology Society
    Presentation's date: 2012-08-28
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    Respiratory diseases, which include diseases of the lung, pleura, bronchial tree, trachea, upper respiratory tract and of the respiratory muscles and nerves, are a common and important cause of illness and death among the population. Experimental evidences have shown that tissue lesions have different electrical properties compared with normal tissue. Therefore, lung tissues lesions may be differentiated from lung normal tissue by comparing the tissue passive electrical properties. The manuscript reports a feasibility study for minimally invasive in vivo human lung tissue tetrapolar bioimpedance measurements using a catheter during the bronchoscopy procedure based on multisine Electrical Impedance Spectroscopy (EIS) at 10 kHz - 1 MHz.

  • Monitorización del patrón ventilatorio (PV) mediante tomografía por impedancia eléctrica (TIE) en paciente con enfermedad pulmonar obstructiva crónica (EPOC)  Open access

     Balleza Ordaz, José Marco
    Defense's date: 2012-07-20
    Department of Automatic Control, Universitat Politècnica de Catalunya
    Theses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    El objetivo de esta investigación fue obtener un modelo matemático de calibración que permita estimar cuantitativamente el patrón ventilatorio (PV), en términos de volumen, en un grupo de voluntarios sanos y pacientes con enfermedad pulmonar obstructiva crónica (EPOC). Todo ello a partir de la información regional de la variación temporal de impedancia eléctrica obtenida con el equipo TIE4sys (sistema de tomografía por impedancia eléctrica), prescindiendo de la calibración individual con un neumotacómetro. Para lograr este objetivo la presente investigación se dividió en dos etapas. La primera etapa consistió en obtener y evaluar un grupo de ecuaciones de calibración utilizando 7 regiones de interés (ROI) en un grupo de voluntarios sanos (hombres y mujeres). La primera ROI incluyó todos los elementos de la imagen TIE. Dos ROI fueron definidas usando solamente los pixeles con variación superior al 70% y 30% de la máxima (método porcentajes). Dos fueron obtenidas definiendo el contorno de forma manual (método mouse) usando como referencia las ROI anteriores. Las dos últimas fueron máscaras elípticas con excentricidad 0,8 y eje mayor de 32 y 25 pixeles, respectivamente. En el caso de hombres, la media del coeficiente de determinación (R2) de las ecuaciones de calibración fue de 93 ± 5%. Los parámetros comunes en todas ellas fueron el pliegue subescapular y peso. Las menores dispersiones en la estimación de volumen se obtuvieron usando todos los elementos de la imagen, la ROI reducida al 70% con el método porcentajes y ambas máscaras elípticas. El valor medio de dichas dispersiones fue del 8%. En el caso de mujeres se analizaron 4 grupos: el grupo total y 3 que resultaron de estratificar la muestra en función al IMC. La media del R2 de todas las ecuaciones de calibración fue del 58 ± 12%. El parámetro más significativo en todas ellas fue la edad. En todos los grupos de mujeres se obtuvieron dispersiones en la estimación de volumen muy elevadas cuyo valor medio fue del 28 ± 5%.

    The goal of this research is to obtain a mathematical calibration model to estimate, in a quantitative way and in terms of volume, the ventilatory pattern in a group of healthy volunteers and chronic obstructive pulmonary disease (COPD) patients. Several models were built from the changes on the regional electrical impedance obtained by TIE4sys (electrical impedance tomograph), without requiring an individual calibration with a pneumotachometer. In order to achieve this aim, the research was divided into 2 parts. The first part involved obtaining and assessing a set of calibration equations, using 7 regions of interest (ROI), in a group of healthy volunteers (males and females). The first ROI included all EIT image elements. Two ROI were defined by only including the pixels displaying changes larger than 70% and 30% of the maximum value of pixel change (percentage method). Two were determined by defining the region boundaries manually (mouse method), using as a reference the above ROI. The remaining two were elliptical masks with eccentricity of 0,8 and major axis of 32 and 25 pixels, respectively. In the case of healthy males, the mean value of the determination coefficients (R2) of all calibration equations was 93±5%. The parameters appearing in all of them were the subscapular skinfold and the weight. The smallest volume estimation dispersions obtained with TIE4sys were those using all elements of ROI, the reduced ROI by percentage method to 70% and both elliptical masks. The mean value of these volume estimation dispersions was of 8%. The group of female volunteers was further divided in 4 groups, one including all females and 3 groups obtained from the stratification of the sample according to BMI. The mean value of R2 of all calibration equations was of 58±12%. The most significant parameter involved in all of them was the age. The dispersion in the estimation of volume for all groups was of 28±3%.The second part involved the assessment of the previous healthy male calibration equations in a group of COPD patients. Preliminary results showed an underestimation of volume estimations obtained by TIE4sys. Due to this fact, a set of adjustment mathematical models were obtained in order to improve the estimation of volume. The mean value of R2 of all adjustment equations obtained in this group was 87±7%. The most significant parameters involved in these equations were subscapular skinfold and weight. The smallest volume estimation dispersions by TIE4sys were obtained by using the elliptical mask with major axis of 25 pixels. The mean value of these dispersions was 14±1%. Furthermore, a subgroup of patients for which all pulmonary function tests (PFT) were available, was analyzed. The mean value of R2 of all adjustment equations obtained in this sample was 88±6%. From all PFT parameters, only the pressure of carbon dioxide in arterial blood (PCO2) was involved in 4 of 7 adjustment equations obtained in this group. The mean value of volume dispersions obtained by TIE4sys, using this 4 equations, was of 19±6%. This value is higher than the one obtained for the whole group. Conclusion. The mathematical adjustment of the calibration equations for healthy males was better than the one obtained for females. This fact highlighted that the anthropometric parameters used in the male group were statistically significant, while they were not for females. For this reason, larger volume estimation dispersions were obtained in this latter group. In the case of COPD patients, all healthy male calibration equations were improved by a mathematical adjustment model. In this case, the smallest volume estimation dispersions were obtained by using the elliptical mask with major axis of 25 pixels. The results obtained in the group of healthy males and COPD patients have been encouraging and it leads us to think that EIT technique can become part of PFT. In the case of females additional efforts should be made to find a calibration equation

  • Electrical impedance tomography in acute lung injury

     Riera, J.; Riu Costa, Pere Joan; Casan, Pere; Masclans, Josep Ramon
    Medicina intensiva
    Date of publication: 2011-11
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Contribution to long term telemetry in small laboratory animals

     Zabaco Natali, Oscar
    Defense's date: 2011-09-07
    Department of Automatic Control, Universitat Politècnica de Catalunya
    Theses

     Share Reference managers Reference managers Open in new window

  • Transoesophageal bioimpedance analysis for the detection of graft rejection after cardiac transpantation

     Giovinazzo, Giuseppe
    Defense's date: 2011-02-25
    Department of Electronic Engineering, Universitat Politècnica de Catalunya
    Theses

     Share Reference managers Reference managers Open in new window

  • FP7-262029-DRYCHECK

     Rosell Ferrer, Francisco Javier; Riu Costa, Pere Joan; Guasch Martinez, Aleix; Bragos Bardia, Ramon
    Participation in a competitive project

     Share

  • DESARROLLO DE TECNOLOGÍAS AVANZADAS DE PRODUCCIÓN Y VALIDACIÓN DE UN PRODUCTO CELULAR

     Rosell Ferrer, Francisco Javier; Riu Costa, Pere Joan; Bragos Bardia, Ramon
    Participation in a competitive project

     Share

  • Sondas para la medida simultánea de campos eléctricos y magnéticos de alta intensidad en campo próximo y en el dominio del tiempo

     Silva Martinez, Fernando; Fernandez Chimeno, Mireya; Riu Costa, Pere Joan
    Participation in a competitive project

     Share

  • Access to the full text
    Tomografía de impedancia eléctrica en la lesión pulmonar aguda  Open access

     Jordi, Riera; Riu Costa, Pere Joan; Casan, Pere; Masclans, Josep Ramon
    Medicina intensiva
    Date of publication: 2011-11-01
    Journal article

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    La tomografía de impedancia eléctrica se ha descrito como un nuevo método de monitorización en el paciente crítico en ventilación mecánica. Recientemente ha cobrado especial interés, debido a su aplicabilidad para la monitorización de la ventilación y la perfusión pulmonar. Su implementación continua a pie de cama y el ser una técnica no ionizante y no invasiva son propiedades particulares que la convierten en un recurso extremadamente atractivo. Asimismo, por su capacidad de evaluar las características regionales de la estructura pulmonar, podría constituir una herramienta de monitorización ideal en el heterogéneo pulmón con lesión pulmonar aguda. En el presente artículo de revisión, se explica el concepto físico de la bioimpedancia y su aplicación clínica y se resume la evidencia científica publicada hasta la fecha en lo referido a la utilización de la tomografía de impedancia eléctrica como método de monitorización de la ventilación y de la perfusión, fundamentalmente en el enfermo con lesión pulmonar aguda, así como otras aplicaciones posibles de la técnica en el enfermo crítico. Asimismo, se resumen las limitaciones de la técnica y sus potenciales áreas de desarrollo en el futuro.

  • Comportamiento electromagnético en el dominio del tiempo de estructuras complejas mediante FDTD

     Jauregui Telleria, Ricardo
    Defense's date: 2010-01-22
    Department of Electronic Engineering, Universitat Politècnica de Catalunya
    Theses

     Share Reference managers Reference managers Open in new window

  • Access to the full text
    Power line impedance characterization of automotive loads at the power line communication frequency range  Open access

     Aragon Homar, Marc; Salinas, Mauricio; Riu Costa, Pere Joan; Silva Martinez, Fernando
    European Symposium on Electromagnetic Compatibility
    Presentation's date: 2010-09-13
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    A complete system able to measure complex impedance, both in magnitude and phase, of an automotive electrical load is designed. The development of such system emerged from the need of measure the impedance of these loads in a wide range of frequencies (100 kHz to 30 MHz) while being connected to power supply and in operation. This powered up condition introduces several problems when the impedance is measured by means of traditional instruments such as Vector Network Analyzers (VNA), which could be damaged by transients. Understanding the behaviour of electrical cars loads in the frequency domain is of primary importance not only for in-vehicle Power Line Communication (PLC) channels response, but also to understand electromagnetic emissions (EMI)problems related with this type of communications.

  • Transient FDTD simulation validation

     Jauregui Telleria, Ricardo; Riu Costa, Pere Joan; Silva Martinez, Fernando
    European Symposium on Electromagnetic Compatibility
    Presentation's date: 2010-07-26
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Access to the full text
    Performance assessment of EIT measurement systems  Open access

     Riu Costa, Pere Joan; Antón, Daniel
    International Conference on Electrical Bio-impedance
    Presentation's date: 2010-04-05
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    EIT acquisition systems, when regarded as measuring instruments, can be characterized by their inherent characteristics: reproducibility, repeatability and discrimination. The ultimate limit to all three is noise, whether long-term or short-term noise. In addition, for some applications accuracy can also play a role, although accuracy is not an inherent characteristic and requires a known test object to be defined. Because EIT systems are multichannel instruments and the information of all channels is being combined to produce an image, a procedure to standardize the performance assessment must be set up in order to allow for meaningful comparison of different systems or different settings in the same system. We propose the use of three parameters defined long ago but scarcely used among EIT systems designers: SER (Systematic Error Ratio), NER (Noise Error Ratio) and RER (Reciprocity Error Ratio). We applied these definitions to our latest EIT instruments, TIE5-sys, in a wide frequency range and with different settings in configurable acquisition parameters and provide the interpretation of the results obtained in terms of reproducibility, repeatability and discrimination. We also comment on the tradeoffs that show up when using the usual definition for these figures

  • Access to the full text
    Common mode feedback analysis for EIT systems with distributed current sources  Open access

     Antón, Daniel; Riu Costa, Pere Joan
    International Conference on Electrical Bio-impedance
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    The use of differential voltage measurements is widely used in EIT instruments. Instrumentation amplifiers are always affected by common mode voltages at their input. These voltages may have different origins, being the current sources and multiplexers the ones which contribute the most. However, even considering ideal current sources and multiplexers, some amount of common mode voltage will always be present due to the measurement principle. Errors produced by common mode voltages are very difficult to calibrate because they depend on the object being measured. At low frequencies it is easy to design instrumentation amplifiers with high CMRR values, but common mode voltages are also high, mostly because of unbalances in electrode impedances. At higher frequencies common mode voltages are smaller, but the CMRR of the amplifiers also decreases. Common mode feedback (CMF) to reduce common mode voltages has been largely used in EIT systems. There is a good theoretical understanding of CMF for systems using a single current source and a demultiplexer. However there is a new class of instruments which use distributed current sources. In these systems CMF is actually used to change the inherent unbalance among current sources instead of being applied to the output of the current source. We present a theoretical analysis of this new CMF technique and the results obtained when applying it to our latest EIT system

  • Access to the full text
    Tidal Volume (TV) post-process obtained with electrical impedance tomography on a group of chronic obstructive pulmonary disease (COPD) patients. Use of adjust equations  Open access

     Balleza, Marco; Anton Cardona, Daniel; Casan, Pere; Riu Costa, Pere Joan
    International Conference on Electrical Bio-impedance
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    Equations used to estimate ventilation out of EIT images, validated on healthy volunteers show a significant bias and a larger variance when were applied on a COPD patients group. The differences in estimation values were found to be highly correlated with anthropometric parameters. Two groups of 13 and 4 COPD male patients (FEV1/FVC<70% and FVC ≥ 80%) were used in this study. We have measured different anthropometric parameters like age, weight, height and skinfolds. The EIT system (TIE4sys) and a pneumotach were simultaneously connected to monitor tidal volume. The main anthropometric parameters values of 13 COPD patients were: age: 67±9 years, height: 1.65±0.05 m, weight: 72±11 kg, BMI: 26.4±3.3; and the subscapular skinfold thickness was 23±9mm. The mean tidal volume estimated with TIE4sys and the pneumotach were: 0.580±0.212 L and 0.774±0.173 L r = 0.861 (p<0.01). The mean difference was 0.196±0.096 L (p<0.01). On this group we have found out an adjust equation and we have validated it on an independent group of 4 COPD patients. The equation was Diff=-1478+15.6(weight). The mean tidal volume values obtained with pneumotach and TIE4sys on the second group of COPD patients (M:4) were: 0.798±0.395 L and 0.732±0.327 L. The mean of the differences was 0.066±0.114L. The differences of determinations estimated with pneumotach and TIE4sys can be attributed to changes of anthropometric characteristics like subscapular skinfold.

    Postprint (author’s final draft)

  • Tidal volume monitoring with electrical impedance tomography (EIT) on COPD patients : relationship between EIT and diffusion lung transfer (DL,CO)

     Balleza, Marco; Casan, P.; Riu Costa, Pere Joan
    World Congress on Medical Physics and Biomedical Engineering
    Presentation's date: 2009-09-08
    Presentation of work at congresses

    Read the abstract Read the abstract View View Open in new window  Share Reference managers Reference managers Open in new window

    Equations used to estimate ventilation out of EIT images, validated on healthy volunteers show a significant bias and a larger variance when applied to COPD patients. The differences in estimation values were found to be highly correlated to anthropometric parameters and CO exchange (DL,CO) in a previous group of COPD patients. A new group of 13 COPD male patients (FEV1/FVC<70% and FVC ≥ 80%) was used in this study, with stricter inclusion criteria than in the previous one. Anthropometric parameters (age, weight, height, skinfolds) and values of several pulmonary function tests, such as spirometry (FVC, FEV1 and FEV1/FVC), static volumes (RV and TLC) and pulmonary diffusion (DL,CO and DL,CO /VA) were recorded. The EIT system (TIE4sys) and a pneumotach were simultaneously connected to monitor tidal volume. The anthropometric main values of COPD patients were: Age 67±9 years; height 1.65±0.05 m; weight 72±11 kg; BMI 26.4±3.3 kg/m2; Subscapular skinfold 23±9 mm. The mean values of pulmonary function test were: Spyrometry FVC 83±13, FEV1 47±15% of reference value and FEV1/FVC 40±9%. Static Volume test RV 168±43% and TLC 119±12% of reference value. Pulmonary diffusion test DL,CO 56±15%, DL,CO,ADJ 57±15% and DL,CO /VA 68±13% of reference value. The mean tidal volumes estimated with TIE4sys and the pneumotach were: 0.544±0.196 L and 0.763±0.168 L r = 0.861 (p<0.01). The mean difference was 0.218±0.100 L (p<0.01). The differences show a strong correlation with the subscapular and rear skinfold; and the pulmonary diffusion values. The correction equation was: Difference=0.09-0.005 ⋆ (DL,CO,ADJ) +0.028 ⋆ (rear_skinfold)-0.01 ⋆ (subscapular skinfold) (R2=0.899; p<0.01). The differences of determinations estimated with pneumotach and TIE4sys can be attributed to changes in lung internal anatomy (DL,CO, DL,CO,adj Hb, DL,CO/VA) and also anthropometric characteristics like subscapular skinfold.

  • Medición del patrón ventilatorio mediante tomografía por impedancia eléctrica en pacientes con EPOC

     Balleza, Marco; Calaf, Núria; Feixas, Teresa; González, Mercedes; Antón, Daniel; Riu Costa, Pere Joan; Casan, Pere
    Archivos de bronconeumología
    Date of publication: 2009-06-03
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Instrumentation for bio-impedance measurements

     Riu Costa, Pere Joan; Bragos Bardia, Ramon; Javier, Rosell and Ramon Bragos
    Date of publication: 2009-05-31
    Book chapter

     Share Reference managers Reference managers Open in new window

  • Instrumentation for bio-impedance measurements

     Riu Costa, Pere Joan; Rosell Ferrer, Francisco Javier; Bragos Bardia, Ramon
    Date of publication: 2009
    Book chapter

     Share Reference managers Reference managers Open in new window

  • Development and validation of the thermal diagnostics in LISA Pathfinder  Open access

     Sanjuán Muñoz, Josep
    Defense's date: 2009-09-28
    Department of Electronic Engineering, Universitat Politècnica de Catalunya
    Theses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    This thesis focuses on the issues related to the thermal diagnostics aboard the space mission LISA Pathfinder (LPF). LPF is a technological mission devoted to put to test critical subsystems for the LISA mission. LISA will be the first space born gravitational wave (GW) observatory with the main objective of detecting GWs. GWs are ripples of the space-time geometry caused by acceleration of masses in an asymmetric way. Their detection requires put test masses (TMs) in an almost perfect inertial frame (or free fall).Non-inertial forces perturbing the TMs must be less than 6 fN/sqrt(Hz) in the frequency range of 0.1 mHz to 0.1 Hz and the noise in the measurement between the TMs (separated by 5 Gm) must be of 40 pm/sqrt(Hz) in the same band. To reduce the risks of a direct launch of LISA, ESA has decided to first launch LPF to put all the LISA technologies to test.The payload of LPF, the LISA Technology Package (LTP), contains two TMs placed in two cylinders inside a single spacecraft (SC) and an interferometric system that measures the relative distance between them. The SC isolates the TMs from the external disturbances but internal stray forces will still perturb the TMs. Their levels must be bounded not to challenge the free fall accuracy. One of these disturbances is temperature fluctuations and the aspects related to their measurement are the leitmotif of this thesis.In chapter 1 we have presented how temperature fluctuations couple into the key subsystems of the LTP to degrade their performance. The foreseen effects are radiation pressure, radiometer effect, temperature coefficient of optical components, etc. Onground estimations conclude that the temperature stability in the LTP must be less than 100 microK/sqrt(Hz) in the frequency range of 1 mHz to 30 mHz (LTP band). Since temperature fluctuations are an important issue in LPF and in LISA, a thermal diagnostic subsystem is needed aboard both missions.The task of the thermal diagnostics in the LTP is twofold: on the one hand, temperature fluctuations in different subsystems must be measured with noise levels of 10 microK/sqrt(Hz) in the LTP band. On the other hand, a set of heaters will generate heat pulses that in conjunction with temperature measurements will be used to estimate the actual coupling between temperature and systems performance. These actions will provide information on the behaviour of the system and will permit to identify the fraction of noise in the system coming from temperature issues. The main function of LPF, as precursor mission of LISA, is the understanding of all the noise sources in the system. This will provide clues to the final leap from LPF sensitivity to LISA one.The main investigations carried out during this thesis can be split into three main categories: (i) the design and validation of the LTP temperature measurement subsystem (TMS); (ii) the extension of the system to the LISA requirements; and (iii) the analysis of the in-flight thermal experiments in the LTP. The thesis is organised as follows: in chapter 2 we describe the designed electronics and the temperature sensors chosen. Aspects related to the coupling of the TMS with other subsystems nearby are discussed in chapter 3. Chapter 4 focuses on the design of the testbed needed for the validation of the TMS. Two different testbeds are described: one for the LTP measurement bandwidth (MBW) and another one for the LISA MBW, 0.1 mHz. In chapter 5 we present the results of the test campaigns: the prototype, the engineering model and the flight model systems were put to test. The results of the investigations in the LISA band are also shown. Chapter 6 contains investigations in view of LISA requirements to reduce excess noise at very low frequency and to reduce the floor noise of the measurement. Chapter 7 focuses on the thermal experiment on-board LPF: a set of thermal excitations are proposed to extract information of the thermal behaviour of the key subsystems of the LTP.

  • CÁLCULO DE RADIACIÓN ELECTROMAGNÉTICA EN PRESENCIA DE DIELÉCTRICOS MEDIANTE ANÁLISIS NUMÉRICO

     Silva Martinez, Fernando; Riu Costa, Pere Joan
    Participation in a competitive project

     Share

  • Access to the full text
    Car windshield behavior transient analysis by FDTD  Open access

     Jauregui Telleria, Ricardo; Pous Sola, Marc; Vives, Yolanda; Fernandez Chimeno, Mireya; Riu Costa, Pere Joan; Silva Martinez, Fernando
    European Symposium on Electromagnetic Compatibility
    Presentation's date: 2009-06
    Presentation of work at congresses

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    The present article studies the influence of a car heatable windshield by means of an equivalent material that allows an appropriate meshing of the vehicle. This study has been performed analyzing the propagation of an electromagnetic radiated transient pulse generated by a wire inside a car with and without the windshield. The Finite Differences Time Domain (FDTD) is the method used to obtain the field coupled to antennas located inside and outside the car. We concluded that it is important to take into account the heatable windshield to make a suitable electromagnetic model of the vehicle.

  • A Near-Field Probe for In Situ EMI Measurements of Industrial Installations

     Quilez Figuerola, Marcos; Atienza Picola, Andreu; Fernández-Chimeno, Mireya; Fernandez Chimeno, Mireya; Riu Costa, Pere Joan; Silva Martinez, Fernando; Aragon Homar, Marc
    IEEE transactions on electromagnetic compatibility
    Date of publication: 2008-11
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Espectroscopia de Impedancia Eléctrica para la caracterización de tejidos biológicos. Aplicación específica a medidas dinámicas

     Terrones, B Sánchez; Riu Costa, Pere Joan; Rosell Ferrer, Francisco Javier; Bragos Bardia, Ramon
    Congreso Anual de la Sociedad Española de Ingeniería Biomédica
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Ventilatory pattern monitoring by electrical impedance tomography (EIT) in chronic obstructive pulmonary disease (COPD) patients

     Balleza, M; Feixas, T; Calaf, N; González, M; Antón, D; Riu Costa, Pere Joan; Casan, Riu P J P
    European Conference of the International Federation for Medical and Biological Engineering
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Current Source Design for Electrical Bioimpedance Spectroscopy

     Bragos Bardia, Ramon; Riu Costa, Pere Joan; Fernando, Seoane
    Date of publication: 2008-09
    Book chapter

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Validation of low-level, high-frequency transient FDTD simulation with radiated field measurements

     Jauregui Telleria, Ricardo; Pous Sola, Marc; Fernandez Chimeno, Mireya; Riu Costa, Pere Joan; Silva Martinez, Fernando
    European Symposium on Electromagnetic Compatibility
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Continuous oxygen consumption estimation method for animal cell bioreactors based on low-cost control of the medium dissolved oxygen concentration

     Fontova, A; Soley, A; Gálvez, J; Sarró, E; Lecina, M; Rosell Ferrer, Francisco Javier; Riu Costa, Pere Joan; Cairó, J; Gòdia, F; Bragos Bardia, Ramon
    European Conference of the International Federation for Medical and Biological Engineering
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • HIGH INTENSITY RADIATED FIELD SYNTHETIC ENVIRONMENT

     Silva Martinez, Fernando; Riu Costa, Pere Joan; Atienza Picola, Andreu; Jauregui Telleria, Ricardo Ignacio
    Participation in a competitive project

     Share

  • Monitoring fluid shifts during haemodialysis using local tissue bioimpedance measurement

     Al-Surkhi, O I; Riu Costa, Pere Joan; Vázquez, F; Ibeas, J
    European Conference of the International Federation for Medical and Biological Engineering
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Evaluación de la función pulmonar unilateral mediante tomografía por impedancia eléctrica

     Bruno, J De Lema; Ernestro, Serrano; Serrano Finetti, Roberto Ernesto; Teresa, Feixas; Núria, Calaf; Camacho, María Del Valle; Riu Costa, Pere Joan
    Archivos de bronconeumología
    Date of publication: 2008-08
    Journal article

    View View Open in new window  Share Reference managers Reference managers Open in new window

  • Indicator for hydration balance during heamodialysis based on anisotropic FEM

     Freiberger, M; Brunner, P.; Mayer, M; Surkhi, O I; Riu Costa, Pere Joan; Scharfetter, P J Riu And H
    Physiological measurement
    Date of publication: 2008-06
    Journal article

     Share Reference managers Reference managers Open in new window

  • Access to the full text
    FDTD analysis of SAR from a cell phone inside a vehicle by numerical computation  Open access

     Anzaldi, G; Silva Martinez, Fernando; Fernandez Chimeno, Mireya; Quilez Figuerola, Marcos; Riu Costa, Pere Joan
    IEEE transactions on biomedical engineering
    Date of publication: 2007-05
    Journal article

    Read the abstract Read the abstract Access to the full text Access to the full text Open in new window  Share Reference managers Reference managers Open in new window

    The purpose of this paper is to analyze the influence of the metallic structures of a realistic car body frame on the specific absorption rate (SAR) produced by a cell phone when a complete human body model is placed at different locations inside the vehicle, and to identify the relevant parameters responsible for these changes. The modeling and analysis of the whole system was conducted by means of computer simulations based on the full wave finite-difference time-domain (FDTD) numerical method. The excitation considered was an 835 MHz 2 dipole located as a handsfree communication device or as a hand-held portable system. We compared the SAR at different planes on the human model, placed inside the vehicle with respect to the free space situation. The presence of the car body frame significantly changes the SAR distributions, especially when the dipole is far from the body. Although the results are not conclusive on this point, this change in SAR distribution is not likely to produce an increase above the limits in current guidelines for partial body exposure, but may be signifi- cant for whole-body exposure. The most relevant change found was the change in the impedance of the dipole, affecting the radiated power. A complementary result from the electromagnetic computations performed is the change in the electromagnetic field distribution inside a vehicle when human bodies are present. The whole vehicle model has been optimized to provide accurate results for sources placed inside the vehicle, while keeping low requirements for computer storage and simulation time.

  • Development of a Technology to estimate haemodynamic parameters during haemodialysis.

     SURKHY, OMAR IBRAHIM HUSSEIN
    Defense's date: 2007-10-29
    Department of Electronic Engineering, Universitat Politècnica de Catalunya
    Theses

     Share Reference managers Reference managers Open in new window

  • Monitoring Cole-Cole Parameters During Haemodialysis (HD)

     Al-Surkhi, Omar I; Riu Costa, Pere Joan; Vazquez, F I J Ibeas
    IEEE Engineering in Medicine and Biology Society
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Transient Electromagnetic Field Computation in Automotive Environments using FDTD

     Riu Costa, Pere Joan; Jauregui Telleria, Ricardo; Silva Martinez, Fernando; Fernandez Chimeno, Mireya
    IEEE International Symposium on Electromagnetic Compatibility
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Diccionari de Telecomunicacions

     Aguilar Igartua, Mónica; Alcober Segura, Jesus Angel; Altes Bosch, Jorge; Aragones Cervera, Xavier; Artigas Garcia, David; Bardes Llorensi, Daniel; Barlabe Dalmau, Antoni; Bragos Bardia, Ramon; Calderer Cardona, Josep; Cardama Aznar, Angel; Casademont Serra, Jordi; Casals Ibañez, Lluis; Comeron Tejero, Adolfo; Cotrina Navau, Josep; Cruz Llopis, Luis Javier de La; Dios Otin, Victor Federico; Duxans Barrobes, Helena; Esparza Martin, Oscar; Esquerra Llucià, Ignasi; Garcia Vizcaino, David; Garcies Salva, Pau; Gomez Montenegro, Carlos; Gorricho Moreno, Juan Luis; Guinjoan Gispert, Francisco; Hesselbach Serra, Xavier; Liria Righetti, Antoni; Lopez Salcedo, Jose Antonio; Madrenas Boadas, Jordi; Madueño Ruiz, María Isabel; Mestre Pons, Francesc Xavier; Monte Moreno, Enrique; Morros Rubió, Josep Ramon; Muñoz Tapia, Jose Luis; Pallares Segarra, Esteve; Pons Nin, Joan; Recolons Martos, Jaume; Rincon Rivera, David; Riu Costa, Pere Joan; Ruiz Vela, Inmaculada; Pradell Cara, Lluis; Pascual Iserte, Antonio; Prat Viñas, Luis; Rey Micolau, Francesc; Villares Piera, N. Javier
    Date of publication: 2007-03
    Book

     Share Reference managers Reference managers Open in new window

  • Viable Biomass Probe for a Life Support System Bioreactor

     Bragos Bardia, Ramon; MAS, J; Sevilla, J; López, T; Riu Costa, Pere Joan; Rosell Ferrer, Francisco Javier
    International Conference on Electrical Bio-impedance
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • ABSORBENTS PER A CAMBRA ANECOICA I SONDA

     Riu Costa, Pere Joan
    Participation in a competitive project

     Share

  • A Compact EIT System for Ventilation Monitoring in COPD Patients

     Anton, D; Balleza, M; Fornos, J; Kos, B; Casan, P I P J Riu; Riu Costa, Pere Joan
    International Conference on Electrical Bio-impedance
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Estimation of fluid volume changes during heamodialysis with an anisotropic finite element model

     Freiberger, M; Brunner, P.; Mayer, M; Surkhi, O I; Riu Costa, Pere Joan; Scharfetter, P J Riu I H
    International Conference on Electrical Bio-impedance
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Implantable bioimpedance system for measuring the impedance of kidney

     Bogonez Franco, Francisco; Riu Costa, Pere Joan
    International Conference on Electrical Bio-impedance
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • A Compact EIT System for Ventilation Monitoring in COPD Patients

     Riu Costa, Pere Joan
    International Conference on Electrical Bio-impedance
    Presentation's date: 2007-08-29
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Local Tissue Bioimppedance Measurement for Fluid Shifts during Heamodialysis

     Al-Surkhi, Omar I; Riu Costa, Pere Joan; Vazquez, F; MAS, J; Rodriguez-Jornet, A; García, M I J Ibeas
    International Conference on Electrical Bio-impedance
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Changes in the Arn Bioimpedance with Applied Pressure and Force

     Giovinazzo, G; Al-Surakhi, O I; Bogonez Franco, Francisco; Riu Costa, Pere Joan
    International Conference on Electrical Bio-impedance
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window

  • Tidal Volume Monitoring with Electrical Impedance Tomography. Validation for Healthy Subjects

     Balleza, M; Fornos, J; Calaf, N; Feixas, T; Gonzalez, M; Anton, D; Riu Costa, Pere Joan; Casan, P J Riu I P
    International Conference on Electrical Bio-impedance
    Presentation of work at congresses

     Share Reference managers Reference managers Open in new window