Pub Date : 2016-05-15DOI: 10.1109/MeMeA.2016.7533714
F. Montecchia, F. Midulla, C. Moretti, P. Papoff
High-flow nasal cannula (HFNC) is frequently used to treat respiratory distress in infants and children because of its beneficial effects on alveolar ventilation and respiratory mechanics. Setting an adequate flow rate that meets a patient's peak inspiratory flow (PIF) is thus crucially important to achieve such effects. HFNC flow rate is typically set at 1 L/min/kg +1 as suggested by the manufacturer and increased to 2 L/min/kg according to the degree of respiratory distress. However, whether this empirical flow setting actually meets a patient's PIF has not yet been investigated. In this study, we implemented our previously described respiratory mechanics monitoring system (MAES) with a new spirometry function (NSS) that allows for a simultaneous visualization of the flow tracings of HFNC and the patient's spontaneous breathing. We tested the ability of NSS-MAES to determine the adequacy of empirically set flow rates of 1 L/min/kg +1 or 2 L/min/kg on 9 infants with respiratory distress receiving HFNC. HFNC flow rate was considered adequate if its tracing was just above the patient's respiratory flow. In patients in whom 1 L/kg/min +1 was inadequate, we used NSS-MAES to identify the adequate flow by raising the HFNC flow until it reached the patient's PIF (HFNC_NSS-MAES). We also investigated which flow rate was associated with the maximal decrease of respiratory effort, namely, Pressure Time Product (PTP) and Work of Breathing (WOB). We found that 1 L/min/kg +1, but not 2 L/min/kg was often unable to meet the patient's PIF. In these cases HFNC_NSS-MAES values were around 1.6 L/min/kg. Conversely, HFNC at 2 L/min/kg always exceeded the patient's PIF. All breathing effort indexes tested improved after HFNC treatment with the maximal unloading seen at 2 L/min/kg for PTP and at HFNC_NSS-MAES.
{"title":"Optimization of flow setting during high-flow nasal cannula (HFNC) with a new spirometry system","authors":"F. Montecchia, F. Midulla, C. Moretti, P. Papoff","doi":"10.1109/MeMeA.2016.7533714","DOIUrl":"https://doi.org/10.1109/MeMeA.2016.7533714","url":null,"abstract":"High-flow nasal cannula (HFNC) is frequently used to treat respiratory distress in infants and children because of its beneficial effects on alveolar ventilation and respiratory mechanics. Setting an adequate flow rate that meets a patient's peak inspiratory flow (PIF) is thus crucially important to achieve such effects. HFNC flow rate is typically set at 1 L/min/kg +1 as suggested by the manufacturer and increased to 2 L/min/kg according to the degree of respiratory distress. However, whether this empirical flow setting actually meets a patient's PIF has not yet been investigated. In this study, we implemented our previously described respiratory mechanics monitoring system (MAES) with a new spirometry function (NSS) that allows for a simultaneous visualization of the flow tracings of HFNC and the patient's spontaneous breathing. We tested the ability of NSS-MAES to determine the adequacy of empirically set flow rates of 1 L/min/kg +1 or 2 L/min/kg on 9 infants with respiratory distress receiving HFNC. HFNC flow rate was considered adequate if its tracing was just above the patient's respiratory flow. In patients in whom 1 L/kg/min +1 was inadequate, we used NSS-MAES to identify the adequate flow by raising the HFNC flow until it reached the patient's PIF (HFNC_NSS-MAES). We also investigated which flow rate was associated with the maximal decrease of respiratory effort, namely, Pressure Time Product (PTP) and Work of Breathing (WOB). We found that 1 L/min/kg +1, but not 2 L/min/kg was often unable to meet the patient's PIF. In these cases HFNC_NSS-MAES values were around 1.6 L/min/kg. Conversely, HFNC at 2 L/min/kg always exceeded the patient's PIF. All breathing effort indexes tested improved after HFNC treatment with the maximal unloading seen at 2 L/min/kg for PTP and at HFNC_NSS-MAES.","PeriodicalId":221120,"journal":{"name":"2016 IEEE International Symposium on Medical Measurements and Applications (MeMeA)","volume":"14 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":"115443231","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.2016.7533799
Siti Hajar Abd Rahman, N. Soin, F. Ibrahim
The present paper utilises COMSOL Multiphysics to model structural application of graphene as pressure sensor diaphragm. In this study, deflection and strain induced in a graphene diaphragm due to applied pressure were calculated. Pressure operation of the sensor is divided into two ranges, namely normal pressure and abnormal pressure to find the suitable design for these different pressure ranges. Changes in the band structure can be detected electrically, suggesting a potential application as the ultra-sensitive pressure sensor. This study has paved a new path to discover the feasibility of utilising the thinness of graphene membrane in MEMS piezoresistive pressure sensor specifically in intracranial pressure monitoring.
{"title":"Design of graphene-based MEMS intracranial pressure sensor","authors":"Siti Hajar Abd Rahman, N. Soin, F. Ibrahim","doi":"10.1109/MeMeA.2016.7533799","DOIUrl":"https://doi.org/10.1109/MeMeA.2016.7533799","url":null,"abstract":"The present paper utilises COMSOL Multiphysics to model structural application of graphene as pressure sensor diaphragm. In this study, deflection and strain induced in a graphene diaphragm due to applied pressure were calculated. Pressure operation of the sensor is divided into two ranges, namely normal pressure and abnormal pressure to find the suitable design for these different pressure ranges. Changes in the band structure can be detected electrically, suggesting a potential application as the ultra-sensitive pressure sensor. This study has paved a new path to discover the feasibility of utilising the thinness of graphene membrane in MEMS piezoresistive pressure sensor specifically in intracranial pressure monitoring.","PeriodicalId":221120,"journal":{"name":"2016 IEEE International Symposium on Medical Measurements and Applications (MeMeA)","volume":"133 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":"123134342","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.2016.7533732
A. Campo, J. Dirckx, E. Widman, A. Waz, G. Dudzik, K. Abramski
Cardiovascular diseases (CD) are the leading cause of death worldwide and their prevalence is expected to rise. Important in the etiology of CD is the stiffening of the large arteries (arteriosclerosis) and plaque formation (atherosclerosis) in the common carotid artery (CCA). Increasing evidence shows that both arteriosclerosis and atherosclerosis can be detected by assessing pulse wave velocity (PWV) in the CCA, and several techniques focus on the detection of PWV in this structure. In previous studies, laser Doppler vibrometry (LDV) was proposed as an approach to detect arterial stiffness. In the present work, a compact four-channel LDV system is introduced for PWV detection. Four phantom arteries were assessed mimicking real life cardiovascular pathologies. Due to the high sensitivity and the increased spatial and temporal resolution of the LDV system, PWV could be assessed, and even local changes in phantom architecture could be detected. The system could potentially be used to detect arteriosclerosis and arterial plaque during cardiovascular screening.
{"title":"Application of a new four-channel vibrometer for determination of atherosclerosis: Further advances towards a handheld device","authors":"A. Campo, J. Dirckx, E. Widman, A. Waz, G. Dudzik, K. Abramski","doi":"10.1109/MeMeA.2016.7533732","DOIUrl":"https://doi.org/10.1109/MeMeA.2016.7533732","url":null,"abstract":"Cardiovascular diseases (CD) are the leading cause of death worldwide and their prevalence is expected to rise. Important in the etiology of CD is the stiffening of the large arteries (arteriosclerosis) and plaque formation (atherosclerosis) in the common carotid artery (CCA). Increasing evidence shows that both arteriosclerosis and atherosclerosis can be detected by assessing pulse wave velocity (PWV) in the CCA, and several techniques focus on the detection of PWV in this structure. In previous studies, laser Doppler vibrometry (LDV) was proposed as an approach to detect arterial stiffness. In the present work, a compact four-channel LDV system is introduced for PWV detection. Four phantom arteries were assessed mimicking real life cardiovascular pathologies. Due to the high sensitivity and the increased spatial and temporal resolution of the LDV system, PWV could be assessed, and even local changes in phantom architecture could be detected. The system could potentially be used to detect arteriosclerosis and arterial plaque during cardiovascular screening.","PeriodicalId":221120,"journal":{"name":"2016 IEEE International Symposium on Medical Measurements and Applications (MeMeA)","volume":"44 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":"125158938","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.2016.7533792
P. Rubegni, L. Tognetti, M. Pellegrino, M. Burroni, M. Fimiani, C. Miracco, E. Cinotti, F. Cambazard, R. Bono, G. Cevenini
Spitzoid melanocytic skin lesions (MSL) include Spitz nevi (SN) and spitzoid melanomas (SM). A third rare subset was described, atypical spitz tumors (AST), that share overlapping histologic features of SN and SM. Being difficult to diagnose lesions, both with dermoscopy and histology, there is considerable uncertainty regarding their biological potential. We aimed to investigate if digital dermoscopy analysis (DDA) could select some significantly different features in 41 dermoscopic images including 19 SN and 21 AST. Stepwise logistic regression analysis was performed in order to verify if there were dermoscopic features able to discriminate between SN and AST. No significant dermoscopic criteria were found to distinguish AST from SN. This support the hypothesis that AST was should be considered not as a different entity but within the spectrum of AN lesions.
{"title":"Spitz nevus versus atypical Spitz tumor: Objective morphological differentiation by digital dermoscopy analysis","authors":"P. Rubegni, L. Tognetti, M. Pellegrino, M. Burroni, M. Fimiani, C. Miracco, E. Cinotti, F. Cambazard, R. Bono, G. Cevenini","doi":"10.1109/MeMeA.2016.7533792","DOIUrl":"https://doi.org/10.1109/MeMeA.2016.7533792","url":null,"abstract":"Spitzoid melanocytic skin lesions (MSL) include Spitz nevi (SN) and spitzoid melanomas (SM). A third rare subset was described, atypical spitz tumors (AST), that share overlapping histologic features of SN and SM. Being difficult to diagnose lesions, both with dermoscopy and histology, there is considerable uncertainty regarding their biological potential. We aimed to investigate if digital dermoscopy analysis (DDA) could select some significantly different features in 41 dermoscopic images including 19 SN and 21 AST. Stepwise logistic regression analysis was performed in order to verify if there were dermoscopic features able to discriminate between SN and AST. No significant dermoscopic criteria were found to distinguish AST from SN. This support the hypothesis that AST was should be considered not as a different entity but within the spectrum of AN lesions.","PeriodicalId":221120,"journal":{"name":"2016 IEEE International Symposium on Medical Measurements and Applications (MeMeA)","volume":"39 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":"128733263","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.2016.7533778
Joana Silva, I. Sousa
Strategies for fall risk assessment are currently not multifactorial neither implemented as a regular assessment of health status in clinics or hospital. The reason could be related with a lack of an easy to implement, complete and objective test to assess elderly's fall risk level. More recently, inertial wearable sensors have been used in combination with standard tests to evaluate the performance of the person during each phase of the test in an objective way. This paper proposes a methodology for collecting and analyzing the Timed-Up and Go (TUG) test instrumented with wearable inertial sensors. An automatic algorithm to segment the TUG test into three components was implemented prior to feature extraction. Overall, features from the walking and first turning phases of the tests could provide meaningful information to differentiate groups of high and low fall risk.
{"title":"Instrumented timed up and go: Fall risk assessment based on inertial wearable sensors","authors":"Joana Silva, I. Sousa","doi":"10.1109/MeMeA.2016.7533778","DOIUrl":"https://doi.org/10.1109/MeMeA.2016.7533778","url":null,"abstract":"Strategies for fall risk assessment are currently not multifactorial neither implemented as a regular assessment of health status in clinics or hospital. The reason could be related with a lack of an easy to implement, complete and objective test to assess elderly's fall risk level. More recently, inertial wearable sensors have been used in combination with standard tests to evaluate the performance of the person during each phase of the test in an objective way. This paper proposes a methodology for collecting and analyzing the Timed-Up and Go (TUG) test instrumented with wearable inertial sensors. An automatic algorithm to segment the TUG test into three components was implemented prior to feature extraction. Overall, features from the walking and first turning phases of the tests could provide meaningful information to differentiate groups of high and low fall risk.","PeriodicalId":221120,"journal":{"name":"2016 IEEE International Symposium on Medical Measurements and Applications (MeMeA)","volume":"8 18","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120935890","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.2016.7533763
Amin Amini, K. Banitsas, J. Cosmas
In this paper, two algorithms were tested on 11 healthy adults: one based on heuristic and another one on video tagging machine learning methods for automatic fall detection; both utilizing Microsoft Kinect v2. For our heuristic approach, we used skeletal data to detect falls based on a set of instructions and signal filtering methods. For the machine learning approach, we implemented a dataset utilizing the Adaptive Boosting Trigger (AdaBoostTrigger) algorithm via video tagging to enable fall detection. For each approach, each subject on average has performed six true positive and six false positive fall incidents in two different conditions: one with objects partially blocking the sensor's view and one with partial obstructed field of view. The accuracy of each approach has been compared against one another in different conditions. The result showed an average of 95.42 % accuracy in the heuristic approach and 88.33 % in machine learning technique. We conclude that heuristic approach performs more accurately for fall detection when there is a limited number of training dataset available. Nevertheless, as the gesture detection's complexity increases, the need for a machine learning technique is inevitable.
{"title":"A comparison between heuristic and machine learning techniques in fall detection using Kinect v2","authors":"Amin Amini, K. Banitsas, J. Cosmas","doi":"10.1109/MeMeA.2016.7533763","DOIUrl":"https://doi.org/10.1109/MeMeA.2016.7533763","url":null,"abstract":"In this paper, two algorithms were tested on 11 healthy adults: one based on heuristic and another one on video tagging machine learning methods for automatic fall detection; both utilizing Microsoft Kinect v2. For our heuristic approach, we used skeletal data to detect falls based on a set of instructions and signal filtering methods. For the machine learning approach, we implemented a dataset utilizing the Adaptive Boosting Trigger (AdaBoostTrigger) algorithm via video tagging to enable fall detection. For each approach, each subject on average has performed six true positive and six false positive fall incidents in two different conditions: one with objects partially blocking the sensor's view and one with partial obstructed field of view. The accuracy of each approach has been compared against one another in different conditions. The result showed an average of 95.42 % accuracy in the heuristic approach and 88.33 % in machine learning technique. We conclude that heuristic approach performs more accurately for fall detection when there is a limited number of training dataset available. Nevertheless, as the gesture detection's complexity increases, the need for a machine learning technique is inevitable.","PeriodicalId":221120,"journal":{"name":"2016 IEEE International Symposium on Medical Measurements and Applications (MeMeA)","volume":"34 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":"126934511","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.2016.7533804
Serena Villani, P. Saccomandi, C. Massaroni, E. Schena, R. Cazzato, F. Giurazza, G. Frauenfelder
The aim of the present study was to simulate and experimental assess the temperature distribution and damaged tissue in ex vivo porcine livers undergoing microwave ablation (MWA). Firstly, the interaction between microwave (MW) and liver was simulated to predict tissue temperature distribution and damaged volume; then numerical simulations were experimentally validated. Simulations were performed: i) by considering the geometry of the MW antenna used during the experiments, ii) by implementing the Pennes' equation to calculate the temperature map within the tissue, and iii) by using Arrhenius model to calculate the damaged tissue. The model was validated by performing experiments on four ex vivo pig livers, which were treated using a 2.45 GHz antenna at 100 W for 4 min. Three custom probes were fabricated and calibrated to measure tissue temperature during MWA. These probes consist of a needle embedding one or more Fiber Bragg grating (FBG) sensors. The three probes embed a total of eight FBGs, hence tissue temperature during MWA was monitored at eight distances from the antenna. Simulated temperatures around the antenna agree with experimental data. Moreover, the predicted damaged volume agrees with the volume of coagulation experienced by the tissue undergoing MWA. In conclusion, the proposed thermometric probes allow performing distributed temperature measurement during MWA, as well as facilitate the insertion of the FBGs within the organ. The measurements show that the model is able to accurately predict MWA effects in an ex vivo pig liver.
{"title":"Experimental validation of MWA effects on biological tissue by sensorized needles based on FBG technology","authors":"Serena Villani, P. Saccomandi, C. Massaroni, E. Schena, R. Cazzato, F. Giurazza, G. Frauenfelder","doi":"10.1109/MeMeA.2016.7533804","DOIUrl":"https://doi.org/10.1109/MeMeA.2016.7533804","url":null,"abstract":"The aim of the present study was to simulate and experimental assess the temperature distribution and damaged tissue in ex vivo porcine livers undergoing microwave ablation (MWA). Firstly, the interaction between microwave (MW) and liver was simulated to predict tissue temperature distribution and damaged volume; then numerical simulations were experimentally validated. Simulations were performed: i) by considering the geometry of the MW antenna used during the experiments, ii) by implementing the Pennes' equation to calculate the temperature map within the tissue, and iii) by using Arrhenius model to calculate the damaged tissue. The model was validated by performing experiments on four ex vivo pig livers, which were treated using a 2.45 GHz antenna at 100 W for 4 min. Three custom probes were fabricated and calibrated to measure tissue temperature during MWA. These probes consist of a needle embedding one or more Fiber Bragg grating (FBG) sensors. The three probes embed a total of eight FBGs, hence tissue temperature during MWA was monitored at eight distances from the antenna. Simulated temperatures around the antenna agree with experimental data. Moreover, the predicted damaged volume agrees with the volume of coagulation experienced by the tissue undergoing MWA. In conclusion, the proposed thermometric probes allow performing distributed temperature measurement during MWA, as well as facilitate the insertion of the FBGs within the organ. The measurements show that the model is able to accurately predict MWA effects in an ex vivo pig liver.","PeriodicalId":221120,"journal":{"name":"2016 IEEE International Symposium on Medical Measurements and Applications (MeMeA)","volume":"13 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":"132419047","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.2016.7533797
Marianna Magni, B. Saggin, D. Scaccabarozzi, M. Tarabini
This work deals with measurement of the force and pressure distribution during walking of a patient with both feet not fully formed. Patient' legs are completely formed down to the heels and the beginning of one midfoot. Since the forefoot is missing, the subject has a difficult propulsion during the boost phase and an excessive rotation at the ankle due to an absent malleolar stability. Design of a customized prosthesis, conceived to ease the subject movement, required the measurement of the forces and pressure distributions during movement. In fact, existing trans-tibial and trans-femoral prostheses studies cannot be applied given that the patient has a limited ankle mobility that shall be preserved during the movement. The force and pressure distributions, measured by means of a commercial measurement system based on capacitive sensors, have been used as input for the finite elements based design. Models of the prostheses have been developed and the performed finite element analyses validated the preliminary design, allowing the manufacturing of prosthetic prototypes.
{"title":"Measurement of force and pressure distribution in walking for prosthesis design","authors":"Marianna Magni, B. Saggin, D. Scaccabarozzi, M. Tarabini","doi":"10.1109/MeMeA.2016.7533797","DOIUrl":"https://doi.org/10.1109/MeMeA.2016.7533797","url":null,"abstract":"This work deals with measurement of the force and pressure distribution during walking of a patient with both feet not fully formed. Patient' legs are completely formed down to the heels and the beginning of one midfoot. Since the forefoot is missing, the subject has a difficult propulsion during the boost phase and an excessive rotation at the ankle due to an absent malleolar stability. Design of a customized prosthesis, conceived to ease the subject movement, required the measurement of the forces and pressure distributions during movement. In fact, existing trans-tibial and trans-femoral prostheses studies cannot be applied given that the patient has a limited ankle mobility that shall be preserved during the movement. The force and pressure distributions, measured by means of a commercial measurement system based on capacitive sensors, have been used as input for the finite elements based design. Models of the prostheses have been developed and the performed finite element analyses validated the preliminary design, allowing the manufacturing of prosthetic prototypes.","PeriodicalId":221120,"journal":{"name":"2016 IEEE International Symposium on Medical Measurements and Applications (MeMeA)","volume":"22 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":"132603300","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.2016.7533736
B. Karaboce, K. Kilic, Gizem Erdoğan
Ultrasonic fields induced by HIFU (High Intensity Focused Ultrasound) have been studied. Effect of input electrical power, harmonics and nonlinear propagation of the ultrasound fields has been quantized. Asymmetric waveforms with peak (+) pressures and peak (-) pressures were obtained both numerically and experimentally. Nonlinear propagation with harmonics output was dominant at higher intensities that leads to an increase of the compressional wave and a decrease of rarefactional wave. All measurements have been realized in the constructed system at National Metrology Institute of Turkey, TÜBİTAK UME. Set up includes a water reservoir, positioning system, HIFU transducers, needle hydrophone, power amplifier, signal generator, measurement and control devices which are all controlled by LabVIEW 8.1 software. P+, P- and P pressures have been determined theoretically for each waveform. Wave behaviors generated by the Khoklov-Zabolotskaya-Kuznetsov model (KZK model) and from experiments match in general. Decrease in size of focus point was shown in 3rd harmonic.
{"title":"Investigation of ultrasonic fields produced by HIFU transducers used in cancer therapy","authors":"B. Karaboce, K. Kilic, Gizem Erdoğan","doi":"10.1109/MeMeA.2016.7533736","DOIUrl":"https://doi.org/10.1109/MeMeA.2016.7533736","url":null,"abstract":"Ultrasonic fields induced by HIFU (High Intensity Focused Ultrasound) have been studied. Effect of input electrical power, harmonics and nonlinear propagation of the ultrasound fields has been quantized. Asymmetric waveforms with peak (+) pressures and peak (-) pressures were obtained both numerically and experimentally. Nonlinear propagation with harmonics output was dominant at higher intensities that leads to an increase of the compressional wave and a decrease of rarefactional wave. All measurements have been realized in the constructed system at National Metrology Institute of Turkey, TÜBİTAK UME. Set up includes a water reservoir, positioning system, HIFU transducers, needle hydrophone, power amplifier, signal generator, measurement and control devices which are all controlled by LabVIEW 8.1 software. P+, P- and P pressures have been determined theoretically for each waveform. Wave behaviors generated by the Khoklov-Zabolotskaya-Kuznetsov model (KZK model) and from experiments match in general. Decrease in size of focus point was shown in 3rd harmonic.","PeriodicalId":221120,"journal":{"name":"2016 IEEE International Symposium on Medical Measurements and Applications (MeMeA)","volume":"6 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":"131090272","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.2016.7533711
E. Adamowicz, M. Sikora, Radosław Bonikowski, M. Frydrysiak
Fragrances and essential oils are often microencapsulated and applied on textiles designed for elders, both as compounds of cosmetics and as fragrances e.g. in aromatherapy. However in the aromatic compositions there may be compounds with allergenic activity. Possibility of identification potential fragrance allergens which may be applied on textiles in microcapsules is presented in this article.
{"title":"Fragrance allergens — Possibilities of their identification in components of cosmetotextiles","authors":"E. Adamowicz, M. Sikora, Radosław Bonikowski, M. Frydrysiak","doi":"10.1109/MeMeA.2016.7533711","DOIUrl":"https://doi.org/10.1109/MeMeA.2016.7533711","url":null,"abstract":"Fragrances and essential oils are often microencapsulated and applied on textiles designed for elders, both as compounds of cosmetics and as fragrances e.g. in aromatherapy. However in the aromatic compositions there may be compounds with allergenic activity. Possibility of identification potential fragrance allergens which may be applied on textiles in microcapsules is presented in this article.","PeriodicalId":221120,"journal":{"name":"2016 IEEE International Symposium on Medical Measurements and Applications (MeMeA)","volume":"63 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":"134444983","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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