Pub Date : 2016-08-08DOI: 10.1109/MeMeA.2016.7533741
Rana Fayyaz Ahmad, A. Malik, H. Amin, N. Kamel, F. Reza
Human brain is considered as complex system having different mental states e.g., rest, active or cognitive states. It is well understood fact that brain activity increases with the cognitive load. This paper describes the cognitive and resting state classification based on EEG features. Previously, most of the studies used linear features. EEG signals are non-stationary in nature and have complex dynamics which is not fully mapped by linear methods. Here, we used non-linear feature extraction methods to classify the cognitive and resting states of the human brain. Data acquisition were carried out on eight healthy participants during cognitive state i.e., IQ task and rest conditions i.e., eyes open. After preprocessing, EEG features were extracted using both linear as well as non-linear. Further, these features were passed to the classifier. Results showed that with support vector machine (SVM), we achieved 87.5% classification accuracy with linear and 92.1% classification accuracy with non-linear features.
{"title":"Classification of cognitive and resting states of the brain using EEG features","authors":"Rana Fayyaz Ahmad, A. Malik, H. Amin, N. Kamel, F. Reza","doi":"10.1109/MeMeA.2016.7533741","DOIUrl":"https://doi.org/10.1109/MeMeA.2016.7533741","url":null,"abstract":"Human brain is considered as complex system having different mental states e.g., rest, active or cognitive states. It is well understood fact that brain activity increases with the cognitive load. This paper describes the cognitive and resting state classification based on EEG features. Previously, most of the studies used linear features. EEG signals are non-stationary in nature and have complex dynamics which is not fully mapped by linear methods. Here, we used non-linear feature extraction methods to classify the cognitive and resting states of the human brain. Data acquisition were carried out on eight healthy participants during cognitive state i.e., IQ task and rest conditions i.e., eyes open. After preprocessing, EEG features were extracted using both linear as well as non-linear. Further, these features were passed to the classifier. Results showed that with support vector machine (SVM), we achieved 87.5% classification accuracy with linear and 92.1% classification accuracy with non-linear features.","PeriodicalId":221120,"journal":{"name":"2016 IEEE International Symposium on Medical Measurements and Applications (MeMeA)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123739375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-08-08DOI: 10.1109/MeMeA.2016.7533737
B. Karaboce, Emel Çetin, H. Durmuş
In this study, temperature distribution inside a tissue - mimicking material induced by a HIFU (High Intensity Focused Ultrasound) transducer was investigated with two different methods. In first method T-type thermocouple (TC) temperature sensors and in second method, infrared (IR) camera system was used for determining the temperature distribution on the tissue-mimicking material (TMM). Temperature increase and distribution in the TMM have been characterized during the ultrasonic power application. Temperature measurements were actualized inside a TMM which has characteristics very similar to human liver tissue. Temperature rise has been characterized for different input ultrasonic powers and durations. Two different temperature measuring tools were compared and consistency between these methods was presented.
{"title":"Investigation of temperature rise in tissue — Mimicking material induced by a HIFU transducer","authors":"B. Karaboce, Emel Çetin, H. Durmuş","doi":"10.1109/MeMeA.2016.7533737","DOIUrl":"https://doi.org/10.1109/MeMeA.2016.7533737","url":null,"abstract":"In this study, temperature distribution inside a tissue - mimicking material induced by a HIFU (High Intensity Focused Ultrasound) transducer was investigated with two different methods. In first method T-type thermocouple (TC) temperature sensors and in second method, infrared (IR) camera system was used for determining the temperature distribution on the tissue-mimicking material (TMM). Temperature increase and distribution in the TMM have been characterized during the ultrasonic power application. Temperature measurements were actualized inside a TMM which has characteristics very similar to human liver tissue. Temperature rise has been characterized for different input ultrasonic powers and durations. Two different temperature measuring tools were compared and consistency between these methods was presented.","PeriodicalId":221120,"journal":{"name":"2016 IEEE International Symposium on Medical Measurements and Applications (MeMeA)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121914232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-08-08DOI: 10.1109/MeMeA.2016.7533807
Sara Pangaro, P. Saccomandi, C. Massaroni, S. Silvestri, E. Schena, G. Costamagna, Francesco Maria Di Matteo, M. Caponero, A. Polimadei
The present study investigates the influence of uniform FBG length on temperature measurement under substantial temperature gradient. This analysis is particularly relevant in the scenario of laser ablation (LA), where the temperature gradient close to the optical applicator is significant (e.g., up to 50 °C/mm). Aiming to assess how the sensor length affects the measurement process in LA, both bench and ex vivo experiments were carried out by applying temperature gradient in the range 5 °C/cm-30 °C/cm on 1 mm-length FBG and 10 mm-length FBG. Results showed that the use of small-sized FBGs is recommended in LA for two main reasons: i) the spectrum reflected by shorter sensors has not shown significant alterations with the gradient. Alterations of the spectrum shape could compromise peak detection algorithms, and, therefore, the estimation of the actual temperature; ii) Arrays of shorter sensors can provide multipoint temperature measurements, with quiet good spatial resolution (e.g., 3 mm), by inserting a single fiber in the tissue.
{"title":"Influence of fiber Bragg grating length on temperature measurements in laser-irradiated organs","authors":"Sara Pangaro, P. Saccomandi, C. Massaroni, S. Silvestri, E. Schena, G. Costamagna, Francesco Maria Di Matteo, M. Caponero, A. Polimadei","doi":"10.1109/MeMeA.2016.7533807","DOIUrl":"https://doi.org/10.1109/MeMeA.2016.7533807","url":null,"abstract":"The present study investigates the influence of uniform FBG length on temperature measurement under substantial temperature gradient. This analysis is particularly relevant in the scenario of laser ablation (LA), where the temperature gradient close to the optical applicator is significant (e.g., up to 50 °C/mm). Aiming to assess how the sensor length affects the measurement process in LA, both bench and ex vivo experiments were carried out by applying temperature gradient in the range 5 °C/cm-30 °C/cm on 1 mm-length FBG and 10 mm-length FBG. Results showed that the use of small-sized FBGs is recommended in LA for two main reasons: i) the spectrum reflected by shorter sensors has not shown significant alterations with the gradient. Alterations of the spectrum shape could compromise peak detection algorithms, and, therefore, the estimation of the actual temperature; ii) Arrays of shorter sensors can provide multipoint temperature measurements, with quiet good spatial resolution (e.g., 3 mm), by inserting a single fiber in the tissue.","PeriodicalId":221120,"journal":{"name":"2016 IEEE International Symposium on Medical Measurements and Applications (MeMeA)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122186267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-08-08DOI: 10.1109/MEMEA.2016.7533730
M. Serpelloni, M. Tiboni, M. Lancini, S. Pasinetti, A. Vertuan, M. Gobbo
Robotic devices can be a viable solution in different rehabilitation activities for increasing patients' gains, providing high-frequent, repetitive and interactive rehabilitation treatments. In this paper, the design, development and preliminary characterization of a robotic system for assisted hand rehabilitation, driven by surface EMG measurements, based on the mirroring of healthy hand movements is presented. The healthy hand opening and closing is detected by the muscular activity and this is used to guide a robotic glove moving the paretic hand. The innovative aspects of the research deal firstly in the contemporaneous use of EMG signals and mirroring technique and secondly in the development of an algorithm for the automatic setting of the actuators thresholds. A preliminary system characterization was conducted. The performed tests demonstrate that the system is a viable solution to allow a healthy person to perform exercises of “hand closing” “hand opening”, with ON-OFF and proportional controls, with a success rate in tests carried out by 98%. The proposed system is a starting point for a novel approach to hand mirroring rehabilitation on patients with upper-limb motor deficits.
{"title":"Preliminary study of a robotic rehabilitation system driven by EMG for hand mirroring","authors":"M. Serpelloni, M. Tiboni, M. Lancini, S. Pasinetti, A. Vertuan, M. Gobbo","doi":"10.1109/MEMEA.2016.7533730","DOIUrl":"https://doi.org/10.1109/MEMEA.2016.7533730","url":null,"abstract":"Robotic devices can be a viable solution in different rehabilitation activities for increasing patients' gains, providing high-frequent, repetitive and interactive rehabilitation treatments. In this paper, the design, development and preliminary characterization of a robotic system for assisted hand rehabilitation, driven by surface EMG measurements, based on the mirroring of healthy hand movements is presented. The healthy hand opening and closing is detected by the muscular activity and this is used to guide a robotic glove moving the paretic hand. The innovative aspects of the research deal firstly in the contemporaneous use of EMG signals and mirroring technique and secondly in the development of an algorithm for the automatic setting of the actuators thresholds. A preliminary system characterization was conducted. The performed tests demonstrate that the system is a viable solution to allow a healthy person to perform exercises of “hand closing” “hand opening”, with ON-OFF and proportional controls, with a success rate in tests carried out by 98%. The proposed system is a starting point for a novel approach to hand mirroring rehabilitation on patients with upper-limb motor deficits.","PeriodicalId":221120,"journal":{"name":"2016 IEEE International Symposium on Medical Measurements and Applications (MeMeA)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128338794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-08-08DOI: 10.1109/MeMeA.2016.7533817
I. Ercoli, L. Scalise, P. Marchionni, E. P. Tomasini, V. Carnielli
In neonatal intensive care units many important vital signs are continuously measured in order to have a full monitoring of the patient. To this aim, cardiac rate, respiration activity, blood saturation, body temperature are extensively collected by contact sensors. Temperature, particularly in preterm infants, is a key quantity to be assessed if the aim is to verify the patient development and is/her capacity to regulate the body temperature. Presently, hospital cribs are equipped with large resistance thermometers (two or more); one for measuring temperature at the hepatic site and the second to assess temperature from peripheral sites (i.e. arms, legs). The aim of this paper is to identify the optimal measurement point for the assessment of the skin temperature in peripheral sites. The experimental procedure utilized is based on the use of a multi-point (6 sensing points) measurement system of the skin temperature and of the crib environmental temperature. In this study, 50 premature patients (mean gestation age 34 weeks and mean weight 1791 g) have been measured. Results demonstrate that from the measured data, it is possible to correctly identify the left hand as the measurement point presenting the smallest differences (<; 1.04°C), respect to the central body temperature values (measured in correspondence to the liver).
{"title":"Optimal peripheral measurement point for the assessment of preterm patients in intensive care units","authors":"I. Ercoli, L. Scalise, P. Marchionni, E. P. Tomasini, V. Carnielli","doi":"10.1109/MeMeA.2016.7533817","DOIUrl":"https://doi.org/10.1109/MeMeA.2016.7533817","url":null,"abstract":"In neonatal intensive care units many important vital signs are continuously measured in order to have a full monitoring of the patient. To this aim, cardiac rate, respiration activity, blood saturation, body temperature are extensively collected by contact sensors. Temperature, particularly in preterm infants, is a key quantity to be assessed if the aim is to verify the patient development and is/her capacity to regulate the body temperature. Presently, hospital cribs are equipped with large resistance thermometers (two or more); one for measuring temperature at the hepatic site and the second to assess temperature from peripheral sites (i.e. arms, legs). The aim of this paper is to identify the optimal measurement point for the assessment of the skin temperature in peripheral sites. The experimental procedure utilized is based on the use of a multi-point (6 sensing points) measurement system of the skin temperature and of the crib environmental temperature. In this study, 50 premature patients (mean gestation age 34 weeks and mean weight 1791 g) have been measured. Results demonstrate that from the measured data, it is possible to correctly identify the left hand as the measurement point presenting the smallest differences (<; 1.04°C), respect to the central body temperature values (measured in correspondence to the liver).","PeriodicalId":221120,"journal":{"name":"2016 IEEE International Symposium on Medical Measurements and Applications (MeMeA)","volume":"953 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123308839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-08-08DOI: 10.1109/MeMeA.2016.7533793
G. Cevenini, S. Furini, P. Barbini, L. Tognetti, P. Rubegni
Three scoring systems were considered and described for dermatological applications in which malignant and benign skin lesions have to be recognized: two models are derived from logistic regression and naïve Bayes rule by rounding model parameters to their nearest integer values; the third approach defines the scoring system by a direct stepwise adding of the most significant binary risk factors. An application example of a direct score model was then developed to illustrate important aspects of its design in dermoscopy. The results show that, having many variables available, score models combine simplicity, practicality, high accuracy and good control of overfitting. Also they can incorporate different diagnostic styles of experienced dermatologists, introducing into the model subjective binary variables, some of which also assessed with a significant degree of disagreement.
{"title":"Scoring systems in dermatology","authors":"G. Cevenini, S. Furini, P. Barbini, L. Tognetti, P. Rubegni","doi":"10.1109/MeMeA.2016.7533793","DOIUrl":"https://doi.org/10.1109/MeMeA.2016.7533793","url":null,"abstract":"Three scoring systems were considered and described for dermatological applications in which malignant and benign skin lesions have to be recognized: two models are derived from logistic regression and naïve Bayes rule by rounding model parameters to their nearest integer values; the third approach defines the scoring system by a direct stepwise adding of the most significant binary risk factors. An application example of a direct score model was then developed to illustrate important aspects of its design in dermoscopy. The results show that, having many variables available, score models combine simplicity, practicality, high accuracy and good control of overfitting. Also they can incorporate different diagnostic styles of experienced dermatologists, introducing into the model subjective binary variables, some of which also assessed with a significant degree of disagreement.","PeriodicalId":221120,"journal":{"name":"2016 IEEE International Symposium on Medical Measurements and Applications (MeMeA)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125083739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-08-08DOI: 10.1109/MeMeA.2016.7533733
J. Bouchard, W. Lemaire, Arnaud Samson, C. Paulin, J. Pratte, Y. B. Lauzière, R. Fontaine
Time-domain diffuse optical tomography (TD-DOT) provides information-rich data that have not yet been fully exploited for image reconstruction, notably to increase imaging spatial resolution. Current TD-DOT scanners suffer from a very low sensitivity owing to their small number of detection channels. This leads to excessively long acquisition times for in vivo imaging. To obtain a higher number of detection channels, thus increasing detection density, a low-cost time-correlated single photon counting (TCSPC) system dedicated to TD-DOT imaging was designed and developed, resorting solely to off-the-shelf electronic components to reduce costs, in distinction to custom application-specific integrated circuit (ASIC) solutions. It features 4 input channels with a 13.02 ps bin width and a 18.1 ps FWHM accuracy throughout a measurement dynamic range of 12.5 ns. Each channel includes a leading-edge discriminator, with a programmable threshold, for direct interfacing with off-the-shelf photodetector modules. A software-programmable delay line was added to the channel signal path to compensate for undesired propagation delays. The system also supports a virtually unlimited number of TCSPC channels using a daisy-chain configuration through an onboard Ethernet switch.
{"title":"Preliminary results of a low-cost 4-channel time-correlated single photon counting system for time-domain diffuse optical tomography","authors":"J. Bouchard, W. Lemaire, Arnaud Samson, C. Paulin, J. Pratte, Y. B. Lauzière, R. Fontaine","doi":"10.1109/MeMeA.2016.7533733","DOIUrl":"https://doi.org/10.1109/MeMeA.2016.7533733","url":null,"abstract":"Time-domain diffuse optical tomography (TD-DOT) provides information-rich data that have not yet been fully exploited for image reconstruction, notably to increase imaging spatial resolution. Current TD-DOT scanners suffer from a very low sensitivity owing to their small number of detection channels. This leads to excessively long acquisition times for in vivo imaging. To obtain a higher number of detection channels, thus increasing detection density, a low-cost time-correlated single photon counting (TCSPC) system dedicated to TD-DOT imaging was designed and developed, resorting solely to off-the-shelf electronic components to reduce costs, in distinction to custom application-specific integrated circuit (ASIC) solutions. It features 4 input channels with a 13.02 ps bin width and a 18.1 ps FWHM accuracy throughout a measurement dynamic range of 12.5 ns. Each channel includes a leading-edge discriminator, with a programmable threshold, for direct interfacing with off-the-shelf photodetector modules. A software-programmable delay line was added to the channel signal path to compensate for undesired propagation delays. The system also supports a virtually unlimited number of TCSPC channels using a daisy-chain configuration through an onboard Ethernet switch.","PeriodicalId":221120,"journal":{"name":"2016 IEEE International Symposium on Medical Measurements and Applications (MeMeA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129193972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-08-04DOI: 10.1109/MeMeA.2016.7533796
Alessandra Pacilli, Ilaria Mileti, M. Germanotta, E. D. Sipio, Isabella Imbimbo, I. Aprile, L. Padua, S. Rossi, E. Palermo, P. Cappa
Gait disorders are a primary consequence of Parkinson's Disease (PD), resulting in loss of patients' independence. Recently, Rhythmical Auditory Stimulation (RAS) gave a preliminary proof to benefit gait quality, but the specific methodology requires a long walkway, preventing the use of a traditional complete gait analysis. In the present work we describe an unobtrusive, wearable setup and the related biomechanical model developed for analyzing gait of people with PD during the administration of RAS. One healthy subject was enrolled in the experimental session to validate the estimation of the spatial gait parameters provided by the proposed setup, against an optoelectronic system. Three PD patients were then enrolled to test the setup feasibility in evaluating gait parameters typically adopted in these type of studies. Results related to the validation of the spatial parameter estimation showed a high accuracy of the system in the estimation of the stride length. Preliminary tests on PD patients provided encouraging insights on the wearable setup usability and versatility. Future experimental validation on a larger population will be conducted to fully validate the setup, which opens the way for conducting RAS studies also outside the laboratory environment.
{"title":"A wearable setup for auditory cued gait analysis in patients with Parkinson's Disease","authors":"Alessandra Pacilli, Ilaria Mileti, M. Germanotta, E. D. Sipio, Isabella Imbimbo, I. Aprile, L. Padua, S. Rossi, E. Palermo, P. Cappa","doi":"10.1109/MeMeA.2016.7533796","DOIUrl":"https://doi.org/10.1109/MeMeA.2016.7533796","url":null,"abstract":"Gait disorders are a primary consequence of Parkinson's Disease (PD), resulting in loss of patients' independence. Recently, Rhythmical Auditory Stimulation (RAS) gave a preliminary proof to benefit gait quality, but the specific methodology requires a long walkway, preventing the use of a traditional complete gait analysis. In the present work we describe an unobtrusive, wearable setup and the related biomechanical model developed for analyzing gait of people with PD during the administration of RAS. One healthy subject was enrolled in the experimental session to validate the estimation of the spatial gait parameters provided by the proposed setup, against an optoelectronic system. Three PD patients were then enrolled to test the setup feasibility in evaluating gait parameters typically adopted in these type of studies. Results related to the validation of the spatial parameter estimation showed a high accuracy of the system in the estimation of the stride length. Preliminary tests on PD patients provided encouraging insights on the wearable setup usability and versatility. Future experimental validation on a larger population will be conducted to fully validate the setup, which opens the way for conducting RAS studies also outside the laboratory environment.","PeriodicalId":221120,"journal":{"name":"2016 IEEE International Symposium on Medical Measurements and Applications (MeMeA)","volume":"1970 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130141612","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-05-15DOI: 10.1109/MeMeA.2016.7533805
N. Santo, Camilla Cavaiola, P. Saccomandi, C. Massaroni, F. Giurazza, G. Frauenfelder, E. Schena, Francesco Maria Di Matteo, G. Costamagna, M. Caponero, A. Polimadei
During thermal procedures, the monitoring of tissue temperature is useful to improve therapy success. The aim of this study is the feasibility assessment of a Fiber Bragg Grating (FBG)-based probe, which contains six FBGs, to obtain distributed temperature measurement in tissue undergoing laser ablation (LA). Among different thermometric techniques, FBG sensors show valuable characteristics, even though their sensitivity to strain entails measurement error for patient respiratory movement. We performed: i) the static calibration of the FBG-based probe to estimate the thermal sensitivity of the six FBGs; ii) the estimation of the response time of the FBGs. All FBGs have a thermal sensitivity of 10 pm·°C-1 and a time constant in the order of <; 250 ms. Additionally, we performed a preliminary estimation of the error due to the strain and caused by respiratory movements. Experiments were carried out by simulating a typical respiratory movement on ex vivo swine liver. The measurement error was <;0.6 °C for all FBGs. Eventually, experiments were performed on ex vivo porcine liver undergoing LA to assess the measurement error, called artifact, caused by the direct absorption of the laser light by the metallic needle. The artifact was firstly investigated at 12 relative positions between the needle and the laser applicator, then corrected by a two-variables model. After adjustment, the artifact decreases from about 2.1 °C to about 0.1 °C. The solutions proposed in this study foster confirming the feasibility of the FBG-based probe for temperature monitoring in organ undergoing LA.
{"title":"Feasibility assessment of an FBG-based probe for distributed temperature measurements during laser ablation","authors":"N. Santo, Camilla Cavaiola, P. Saccomandi, C. Massaroni, F. Giurazza, G. Frauenfelder, E. Schena, Francesco Maria Di Matteo, G. Costamagna, M. Caponero, A. Polimadei","doi":"10.1109/MeMeA.2016.7533805","DOIUrl":"https://doi.org/10.1109/MeMeA.2016.7533805","url":null,"abstract":"During thermal procedures, the monitoring of tissue temperature is useful to improve therapy success. The aim of this study is the feasibility assessment of a Fiber Bragg Grating (FBG)-based probe, which contains six FBGs, to obtain distributed temperature measurement in tissue undergoing laser ablation (LA). Among different thermometric techniques, FBG sensors show valuable characteristics, even though their sensitivity to strain entails measurement error for patient respiratory movement. We performed: i) the static calibration of the FBG-based probe to estimate the thermal sensitivity of the six FBGs; ii) the estimation of the response time of the FBGs. All FBGs have a thermal sensitivity of 10 pm·°C-1 and a time constant in the order of <; 250 ms. Additionally, we performed a preliminary estimation of the error due to the strain and caused by respiratory movements. Experiments were carried out by simulating a typical respiratory movement on ex vivo swine liver. The measurement error was <;0.6 °C for all FBGs. Eventually, experiments were performed on ex vivo porcine liver undergoing LA to assess the measurement error, called artifact, caused by the direct absorption of the laser light by the metallic needle. The artifact was firstly investigated at 12 relative positions between the needle and the laser applicator, then corrected by a two-variables model. After adjustment, the artifact decreases from about 2.1 °C to about 0.1 °C. The solutions proposed in this study foster confirming the feasibility of the FBG-based probe for temperature monitoring in organ undergoing LA.","PeriodicalId":221120,"journal":{"name":"2016 IEEE International Symposium on Medical Measurements and Applications (MeMeA)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115703849","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-05-15DOI: 10.1109/MEMEA.2016.7533801
A. Bodini, M. Serpelloni, E. Sardini, N. Latronico, M. Tommasi, Matteo Filippini
Artificial ventilators are commonly used with Passive Heat-Moisture Exchangers (HME) to warm and humidify the inspired air in order to ensure a proper conditioning of inspired gases to the artificially ventilated patients. However, different aspects potentially affect their performances and this change in performance should be analyzed in-vivo during HME operation. In this paper, a wireless measurement system is proposed for the monitoring of air temperature and humidity in-vivo. The system is composed by a measuring device connected to the ventilating tube near the HME and a reading device connected to a Personal Computer (PC). Each device integrates a wireless transmission via low-power Bluetooth module that allows limiting power consumption. For the measuring device, the calculated power consumption when all the on-board components are working is about 15 mA, permitting a continuous monitoring for about 5 days and 16 hours with a rechargeable Li-Ion battery of 2050 mAh. A first prototype was manufactured and tested in the laboratory. Then, this prototype was tested with a setup specially developed to simulate human breath. The tests were conduced changing the respiratory rate and minute volume. Preliminary results are reported showing interesting aspects, such as the warm-up time of the HME. Furthermore, the results shows a direct dependence of humidity loss on frequency-volume ratio requiring future investigations. Clinicians are expected to use this system in-vivo to identify the correlations between clinical issues and HME performances.
{"title":"Low-power wireless system for temperature and humidity monitoring in artificial ventilation","authors":"A. Bodini, M. Serpelloni, E. Sardini, N. Latronico, M. Tommasi, Matteo Filippini","doi":"10.1109/MEMEA.2016.7533801","DOIUrl":"https://doi.org/10.1109/MEMEA.2016.7533801","url":null,"abstract":"Artificial ventilators are commonly used with Passive Heat-Moisture Exchangers (HME) to warm and humidify the inspired air in order to ensure a proper conditioning of inspired gases to the artificially ventilated patients. However, different aspects potentially affect their performances and this change in performance should be analyzed in-vivo during HME operation. In this paper, a wireless measurement system is proposed for the monitoring of air temperature and humidity in-vivo. The system is composed by a measuring device connected to the ventilating tube near the HME and a reading device connected to a Personal Computer (PC). Each device integrates a wireless transmission via low-power Bluetooth module that allows limiting power consumption. For the measuring device, the calculated power consumption when all the on-board components are working is about 15 mA, permitting a continuous monitoring for about 5 days and 16 hours with a rechargeable Li-Ion battery of 2050 mAh. A first prototype was manufactured and tested in the laboratory. Then, this prototype was tested with a setup specially developed to simulate human breath. The tests were conduced changing the respiratory rate and minute volume. Preliminary results are reported showing interesting aspects, such as the warm-up time of the HME. Furthermore, the results shows a direct dependence of humidity loss on frequency-volume ratio requiring future investigations. Clinicians are expected to use this system in-vivo to identify the correlations between clinical issues and HME performances.","PeriodicalId":221120,"journal":{"name":"2016 IEEE International Symposium on Medical Measurements and Applications (MeMeA)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115831337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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