Pub Date : 2012-03-26DOI: 10.1109/PAHCE.2012.6233437
J. Suthakorn
In our research group at the BART LAB, Mahidol University, Thailand, we have been conducting research on Computer-Integrated Surgery an/d Robot-Assisted Surgery for the past 8 years. The research involved several surgical applications, such as, laparoscopic surgery, percutaneous breast biopsy, neurosurgery, total-knee replacement and closed intramedullary of femur. Our experience included development of a novel 4-DOF wire-driven laparoscopic surgical robot, development of image-guided endoscopic robot, endoscopic tracking using electromagnetic field, development of total-knee replacement surgical planning and surgical robot, development of a robot-guiding system for closed intramedullary nailing of femur, development of a percutaneous ultrasound image-guided breast biopsy, development of a force-feedback haptic interface for surgical training, investigation on neurosurgical robot and investigation on intracranial pressure sensing system. This study is to develop a large-scale tele-surgical system which allows an expert-surgeon group to remotely work incorporate with a field-surgeon group based on image guiding and robotic technology. The tele-surgical system is separated into 3 sections: (1) Expert Site, (2) Surgical Site and (3) TeleCommunication for Surgery. The Expert Station is for the expert-surgeons to remotely control the surgical robots at the Surgical Station through a 3-D force-feedback haptic robot controller. The Expert Station is equipped with a set of monitors to display the real-time image from surgical site, the sensing data from the patients and the pre-operative medical images. The Surgical Station is for the field-surgeons which may have less experience than the expert-surgeons in Expert-Station. The field-surgeons are working on the surgical operation with the cooperative-typed surgical robots which are remotely-controlled by the expert-surgeons. The Surgical Station is also equipped with a surgical navigation system, surgeon tracking system and the sensing units. The communications between both stations are designed to perform redundancy based on multi-system which are; LANs, 3G, WiMAX and Satellite. The Cooperative Tele-Surgical System is designed and developed for the remote hospital and the field hospital.
{"title":"A concept on Cooperative Tele-Surgical System based on Image-Guiding and robotic technology","authors":"J. Suthakorn","doi":"10.1109/PAHCE.2012.6233437","DOIUrl":"https://doi.org/10.1109/PAHCE.2012.6233437","url":null,"abstract":"In our research group at the BART LAB, Mahidol University, Thailand, we have been conducting research on Computer-Integrated Surgery an/d Robot-Assisted Surgery for the past 8 years. The research involved several surgical applications, such as, laparoscopic surgery, percutaneous breast biopsy, neurosurgery, total-knee replacement and closed intramedullary of femur. Our experience included development of a novel 4-DOF wire-driven laparoscopic surgical robot, development of image-guided endoscopic robot, endoscopic tracking using electromagnetic field, development of total-knee replacement surgical planning and surgical robot, development of a robot-guiding system for closed intramedullary nailing of femur, development of a percutaneous ultrasound image-guided breast biopsy, development of a force-feedback haptic interface for surgical training, investigation on neurosurgical robot and investigation on intracranial pressure sensing system. This study is to develop a large-scale tele-surgical system which allows an expert-surgeon group to remotely work incorporate with a field-surgeon group based on image guiding and robotic technology. The tele-surgical system is separated into 3 sections: (1) Expert Site, (2) Surgical Site and (3) TeleCommunication for Surgery. The Expert Station is for the expert-surgeons to remotely control the surgical robots at the Surgical Station through a 3-D force-feedback haptic robot controller. The Expert Station is equipped with a set of monitors to display the real-time image from surgical site, the sensing data from the patients and the pre-operative medical images. The Surgical Station is for the field-surgeons which may have less experience than the expert-surgeons in Expert-Station. The field-surgeons are working on the surgical operation with the cooperative-typed surgical robots which are remotely-controlled by the expert-surgeons. The Surgical Station is also equipped with a surgical navigation system, surgeon tracking system and the sensing units. The communications between both stations are designed to perform redundancy based on multi-system which are; LANs, 3G, WiMAX and Satellite. The Cooperative Tele-Surgical System is designed and developed for the remote hospital and the field hospital.","PeriodicalId":255935,"journal":{"name":"2012 Pan American Health Care Exchanges","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124642395","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 : 2012-03-26DOI: 10.1109/PAHCE.2012.6233426
R. L. Avitia, M. Reyna, M. Bravo, L. A. Cetto
Ventricular Late Potentials make QRS complexes larger, that is why many algorithms are based on quantifying increases in the QRS complex duration. These elongations generate misalignments in the QRS, resulting in practice; the averaged algorithm considers the ECG components, including those VLPs, as well as random variables. We recorded High Resolution ECGs (HRECGs) from 50 subjects in resting position with no heart-stroke antecedents. VLPs were simulated added to the HRECGs, and then two cases were evaluated: (1) duration of the QRS complexes with VLPs without QRS-alignment, and (2) duration of QRS complexes with VLPs using time- and amplitude- QRS-alignment. When using amplitude- and time-alignment it is possible to reach a sensitivity of 0.96 and a specificity of 0.52, as opposed to 0.72 and 0.40, respectively, when using only SAECG without QRS-alignment.
{"title":"Evaluation of a sudden cardiac death indicator using linear approximation and curves alignment","authors":"R. L. Avitia, M. Reyna, M. Bravo, L. A. Cetto","doi":"10.1109/PAHCE.2012.6233426","DOIUrl":"https://doi.org/10.1109/PAHCE.2012.6233426","url":null,"abstract":"Ventricular Late Potentials make QRS complexes larger, that is why many algorithms are based on quantifying increases in the QRS complex duration. These elongations generate misalignments in the QRS, resulting in practice; the averaged algorithm considers the ECG components, including those VLPs, as well as random variables. We recorded High Resolution ECGs (HRECGs) from 50 subjects in resting position with no heart-stroke antecedents. VLPs were simulated added to the HRECGs, and then two cases were evaluated: (1) duration of the QRS complexes with VLPs without QRS-alignment, and (2) duration of QRS complexes with VLPs using time- and amplitude- QRS-alignment. When using amplitude- and time-alignment it is possible to reach a sensitivity of 0.96 and a specificity of 0.52, as opposed to 0.72 and 0.40, respectively, when using only SAECG without QRS-alignment.","PeriodicalId":255935,"journal":{"name":"2012 Pan American Health Care Exchanges","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124470335","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 : 2012-03-26DOI: 10.1109/PAHCE.2012.6233452
A. F. Pereira, T. Costa, A. Schanaider, M. A. von Kruger, W. Pereira
In this work, an ultrasound (US) pulse-echo method was proposed to characterize long bone diaphysis of in vivo animal model. Two quantitative parameters (Integrated Reflection Coefficient ?? IRC and Frequency slope integrated reflection - FSIR) related to US reflection, were applied to the echo from the muscle/bone interface in both femurs of five Wistar rats. FSIR is proposed here is the fraction of the apparent reflection corresponding to each frequency. The US signal is acquired from 3 previous chosen positions, one millimeter apart from each other, along the femur central region. The parameters were estimated for the three positions than averaged to represent the femur. The results showed that their values statistically belong to the same group. This is indication that the proposed method (from acquisition protocol to parameter estimation) has potential to characterize normal in vivo long bones in animal models.
{"title":"In vivo characterization of long-bone in animal model by ultrasonic reflection parameters: IRC and FSIR","authors":"A. F. Pereira, T. Costa, A. Schanaider, M. A. von Kruger, W. Pereira","doi":"10.1109/PAHCE.2012.6233452","DOIUrl":"https://doi.org/10.1109/PAHCE.2012.6233452","url":null,"abstract":"In this work, an ultrasound (US) pulse-echo method was proposed to characterize long bone diaphysis of in vivo animal model. Two quantitative parameters (Integrated Reflection Coefficient ?? IRC and Frequency slope integrated reflection - FSIR) related to US reflection, were applied to the echo from the muscle/bone interface in both femurs of five Wistar rats. FSIR is proposed here is the fraction of the apparent reflection corresponding to each frequency. The US signal is acquired from 3 previous chosen positions, one millimeter apart from each other, along the femur central region. The parameters were estimated for the three positions than averaged to represent the femur. The results showed that their values statistically belong to the same group. This is indication that the proposed method (from acquisition protocol to parameter estimation) has potential to characterize normal in vivo long bones in animal models.","PeriodicalId":255935,"journal":{"name":"2012 Pan American Health Care Exchanges","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129308116","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 : 2012-03-26DOI: 10.1109/PAHCE.2012.6233428
J. Cerqueira, J. G. Machado, M. Ramos, J. S. Melo, L. Brasil
This paper presents the concept of a new platform used to simulate surgical procedures in health field. Jchai3D is a tool which allows easy developing of virtual reality applications. Using this framework is possible to build simulations systems which can be used as educational/training tools. Jchai3D is totally open-source and it is available online for download. In addition, Jchai3D is multiplatform, and it can be executed in several environments like Windows, Linux or Mac OS.
{"title":"Simulation of surgical procedures with Jchai3D","authors":"J. Cerqueira, J. G. Machado, M. Ramos, J. S. Melo, L. Brasil","doi":"10.1109/PAHCE.2012.6233428","DOIUrl":"https://doi.org/10.1109/PAHCE.2012.6233428","url":null,"abstract":"This paper presents the concept of a new platform used to simulate surgical procedures in health field. Jchai3D is a tool which allows easy developing of virtual reality applications. Using this framework is possible to build simulations systems which can be used as educational/training tools. Jchai3D is totally open-source and it is available online for download. In addition, Jchai3D is multiplatform, and it can be executed in several environments like Windows, Linux or Mac OS.","PeriodicalId":255935,"journal":{"name":"2012 Pan American Health Care Exchanges","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129450353","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 : 2012-03-26DOI: 10.1109/PAHCE.2012.6233444
M. Rodriguez, Eunme Cha, J. Finkelstein
This study is aimed to evaluate the feasibility of diabetes computer-assisted education model combining behavioral theories and interactive computer media among seniors in the Hispanic community.
本研究旨在评估结合行为理论与互动电脑媒体的糖尿病电脑辅助教育模式在西班牙裔社区老年人中的可行性。
{"title":"Feasibility of computer-assisted diabetes education in hispanic seniors","authors":"M. Rodriguez, Eunme Cha, J. Finkelstein","doi":"10.1109/PAHCE.2012.6233444","DOIUrl":"https://doi.org/10.1109/PAHCE.2012.6233444","url":null,"abstract":"This study is aimed to evaluate the feasibility of diabetes computer-assisted education model combining behavioral theories and interactive computer media among seniors in the Hispanic community.","PeriodicalId":255935,"journal":{"name":"2012 Pan American Health Care Exchanges","volume":"113 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117288128","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 : 2012-03-26DOI: 10.1109/PAHCE.2012.6233430
C. Nichols, R. Hahn, A. Nadershahi, K. Jones
Bringing biomedical innovations to commercialization requires a detailed navigation of the product development system on several challenging levels. Detailed knowledge of the product design from an engineering front combined with the proper application of the product to clinical scenarios, patent law application with proper funding, and marketing involve an enormity of complex systemic steps and policies that can make this an impossible task for academically inspired innovations of which the inventor typically has little knowledge or skills to achieve. Through the USC/Alfred Mann Institute of Biomedical Engineering, we have designed a company team, Med Tools, Inc, which includes specialists from several necessary disciplines to achieve this goal in a financially reasonable, timely and system comprehensive manner. The team includes patent lawyers, mechanical engineers, medical doctors in academia, and physicians with media/public relations who all raised an internal financial pool to begin the process and keep the company Board of Directors to a minimum of the original founders. After a meeting during which initial team's goals were discussed and capitol was raised, the design process between the engineers and physicians began, including aspects of how a physician would need a proposed product to perform clinically combined with what engineering aspects would have to be met. During the time in which several models were introduced, tested and reformatted by the engineers and physicians, the patent law specialists were busy tackling the process of patent application for the proposed models. In addition, through major AMI connections, marketing was investigated as well as proposed partners for product production. At this time, we have designed products ready for marketing and clinical implementation. For example the `Perineal Umbrella' an academic physician's original invention brought to fruition thorough the team approach which we have brought for demonstration purposes.
{"title":"A systematic commercialization approach for academically developed biomedical innovations","authors":"C. Nichols, R. Hahn, A. Nadershahi, K. Jones","doi":"10.1109/PAHCE.2012.6233430","DOIUrl":"https://doi.org/10.1109/PAHCE.2012.6233430","url":null,"abstract":"Bringing biomedical innovations to commercialization requires a detailed navigation of the product development system on several challenging levels. Detailed knowledge of the product design from an engineering front combined with the proper application of the product to clinical scenarios, patent law application with proper funding, and marketing involve an enormity of complex systemic steps and policies that can make this an impossible task for academically inspired innovations of which the inventor typically has little knowledge or skills to achieve. Through the USC/Alfred Mann Institute of Biomedical Engineering, we have designed a company team, Med Tools, Inc, which includes specialists from several necessary disciplines to achieve this goal in a financially reasonable, timely and system comprehensive manner. The team includes patent lawyers, mechanical engineers, medical doctors in academia, and physicians with media/public relations who all raised an internal financial pool to begin the process and keep the company Board of Directors to a minimum of the original founders. After a meeting during which initial team's goals were discussed and capitol was raised, the design process between the engineers and physicians began, including aspects of how a physician would need a proposed product to perform clinically combined with what engineering aspects would have to be met. During the time in which several models were introduced, tested and reformatted by the engineers and physicians, the patent law specialists were busy tackling the process of patent application for the proposed models. In addition, through major AMI connections, marketing was investigated as well as proposed partners for product production. At this time, we have designed products ready for marketing and clinical implementation. For example the `Perineal Umbrella' an academic physician's original invention brought to fruition thorough the team approach which we have brought for demonstration purposes.","PeriodicalId":255935,"journal":{"name":"2012 Pan American Health Care Exchanges","volume":"137 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132419887","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 : 2012-03-26DOI: 10.1109/PAHCE.2012.6233442
E. T. A. Alves, L. Frucht, M. N. Souza, A. F. Nobrega
This work concerns a program (EFlow) that has been developed to assist experts in clustering flow cytometry multivariate data. EFlow aims to reduce subjectivity but keeping the expert's control over the analysis. In the present paper we will focus on the use of the iterative optimization algorithm. This algorithm is a hill-climbing unsupervised procedure that in general guarantees good local but not global optimization. A comparison between clustering processes achieved by an expert in flow cytometry and by EFlow was performed in a data related to bone marrow cells stained for the surface expression of molecules (B220, IgM and CD23) that characterize the B cell lineage. This data set is considered to present a medium difficult and had 63780 cells with 7 channels or dimensions. Two types of clustering processes were compared, one with four clusters and another with five clusters. The results obtained by EFlow were considered satisfactory by the expert as they were significantly in agreement with his classification. In some clusters, EFlow classified correctly up to 100% of the cells. At the present time few commercial cytometry software offer equivalent clustering analysis.
{"title":"Iterative optimization algorithm - An alternative clustering tool for biological analysis using flow cytometry data","authors":"E. T. A. Alves, L. Frucht, M. N. Souza, A. F. Nobrega","doi":"10.1109/PAHCE.2012.6233442","DOIUrl":"https://doi.org/10.1109/PAHCE.2012.6233442","url":null,"abstract":"This work concerns a program (EFlow) that has been developed to assist experts in clustering flow cytometry multivariate data. EFlow aims to reduce subjectivity but keeping the expert's control over the analysis. In the present paper we will focus on the use of the iterative optimization algorithm. This algorithm is a hill-climbing unsupervised procedure that in general guarantees good local but not global optimization. A comparison between clustering processes achieved by an expert in flow cytometry and by EFlow was performed in a data related to bone marrow cells stained for the surface expression of molecules (B220, IgM and CD23) that characterize the B cell lineage. This data set is considered to present a medium difficult and had 63780 cells with 7 channels or dimensions. Two types of clustering processes were compared, one with four clusters and another with five clusters. The results obtained by EFlow were considered satisfactory by the expert as they were significantly in agreement with his classification. In some clusters, EFlow classified correctly up to 100% of the cells. At the present time few commercial cytometry software offer equivalent clustering analysis.","PeriodicalId":255935,"journal":{"name":"2012 Pan American Health Care Exchanges","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132795998","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 : 2012-03-26DOI: 10.1109/PAHCE.2012.6233445
V. Hipólito, S. Luna, I. Bazán, A. Ramírez, M. Trujillo, R. Pintle, A. Ramos
Nowadays new methods of echographic signal processing have emerged to support the medical diagnosis. In the first stage of development, these methods should be assessed with a considerable number of realistic echo-signals. In this paper, a mathematical model of hepatic tissue is proposed. This will be used to generate echo-graphic signals adjusted to realistic acquired waveforms. The model is based on a set of characteristics computed from echographic signals produced by the inspection of the healthy liver tissue. These characteristics were a) average power, b) signal to noise ratio (SNR) and c) inter-arrival time standard deviation. In order to emulate the realistic signals, the model was fitted accordingly throughout different values of the three parameters. A comparative analysis between real and simulated signals is presented. Conclusions about obtained results are given, including the parameters values (SNR equal to 6 dB, Average Power equal to 4.08e-4 W and an inter-arrival time standard deviation equal to 1.43e-6 s) of the simulated signals that presented the higher correlation coefficient (0.3003).
{"title":"Multi-echo signals simulation based on a mathematical model adjusted to hepatic tissue echographic behavior","authors":"V. Hipólito, S. Luna, I. Bazán, A. Ramírez, M. Trujillo, R. Pintle, A. Ramos","doi":"10.1109/PAHCE.2012.6233445","DOIUrl":"https://doi.org/10.1109/PAHCE.2012.6233445","url":null,"abstract":"Nowadays new methods of echographic signal processing have emerged to support the medical diagnosis. In the first stage of development, these methods should be assessed with a considerable number of realistic echo-signals. In this paper, a mathematical model of hepatic tissue is proposed. This will be used to generate echo-graphic signals adjusted to realistic acquired waveforms. The model is based on a set of characteristics computed from echographic signals produced by the inspection of the healthy liver tissue. These characteristics were a) average power, b) signal to noise ratio (SNR) and c) inter-arrival time standard deviation. In order to emulate the realistic signals, the model was fitted accordingly throughout different values of the three parameters. A comparative analysis between real and simulated signals is presented. Conclusions about obtained results are given, including the parameters values (SNR equal to 6 dB, Average Power equal to 4.08e-4 W and an inter-arrival time standard deviation equal to 1.43e-6 s) of the simulated signals that presented the higher correlation coefficient (0.3003).","PeriodicalId":255935,"journal":{"name":"2012 Pan American Health Care Exchanges","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123256815","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 : 2012-03-26DOI: 10.1109/PAHCE.2012.6233454
M. Reyna-Carranza, L. Fierro, M. Bravo-Zanoguera
Thousands of deaths can be prevented detecting Ventricular Late Potentials (VLPs) in patients who have suffered infarcts heart attacks. The current method to detect VLPs based on time domain analysis presents low predictive values. VLPs are very difficult to detect because have amplitudes between 5 and 20 μV and their spectrum is difficult to distinguish from noise spectrum. The Wigner distribution (WD) is used to analyze pseudo-stationary signals, such as the VLPs. The WD generates artifacts known as cross terms (CTs), which are considered undesirable in some cases, however can be used to infer the presence of very small signal terms, in this case VLPs terms. The purpose of this research is to characterize the CTs generated by VLPs presence to improve their detection and prevent the sudden cardiac death.
{"title":"Wigner distribution's cross terms characterization to detect patterns of Ventricular Late Potentials","authors":"M. Reyna-Carranza, L. Fierro, M. Bravo-Zanoguera","doi":"10.1109/PAHCE.2012.6233454","DOIUrl":"https://doi.org/10.1109/PAHCE.2012.6233454","url":null,"abstract":"Thousands of deaths can be prevented detecting Ventricular Late Potentials (VLPs) in patients who have suffered infarcts heart attacks. The current method to detect VLPs based on time domain analysis presents low predictive values. VLPs are very difficult to detect because have amplitudes between 5 and 20 μV and their spectrum is difficult to distinguish from noise spectrum. The Wigner distribution (WD) is used to analyze pseudo-stationary signals, such as the VLPs. The WD generates artifacts known as cross terms (CTs), which are considered undesirable in some cases, however can be used to infer the presence of very small signal terms, in this case VLPs terms. The purpose of this research is to characterize the CTs generated by VLPs presence to improve their detection and prevent the sudden cardiac death.","PeriodicalId":255935,"journal":{"name":"2012 Pan American Health Care Exchanges","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114150212","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 : 2012-03-26DOI: 10.1109/PAHCE.2012.6233436
C. P. Carvalho, B. França, V. C. Martins, A. V. Pino, M. A. von Kruger, W. Pereira
The aim of this study was to develop a left coronary circulation flow phantom whose flow can be simulated and adjusted mimicking physiological, or pathological conditions. This system is an extension of a previous phantom developed in the Ultrasound Lab (PEB/COPPE/UFRJ) which mimics the pressure profile found in human aorta.
{"title":"Simulation of the left coronay flow","authors":"C. P. Carvalho, B. França, V. C. Martins, A. V. Pino, M. A. von Kruger, W. Pereira","doi":"10.1109/PAHCE.2012.6233436","DOIUrl":"https://doi.org/10.1109/PAHCE.2012.6233436","url":null,"abstract":"The aim of this study was to develop a left coronary circulation flow phantom whose flow can be simulated and adjusted mimicking physiological, or pathological conditions. This system is an extension of a previous phantom developed in the Ultrasound Lab (PEB/COPPE/UFRJ) which mimics the pressure profile found in human aorta.","PeriodicalId":255935,"journal":{"name":"2012 Pan American Health Care Exchanges","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114811268","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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