Pub Date : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130318
C. Tekes, M. Karaman
Forward looking intravascular ultrasound (IVUS) imaging with ring arrays can produce real time volumetric imaging. Due to the limited catheter size, data acquisition and image reconstruction are based on synthetic phased array processing to reduce the motion artifacts. The number of signal firing/receivening steps must be kept small. This can be achieved by reducing the redundant spatial frequency components. For this purpose, we explore different sampling methods. We tested the imaging performance of coarrays with different sampling schemes on the simulated point spred functions of original and control coarray sets. Simulation results show equivalent performance in 40 dB for an annular ring array of 64 elements with 2049 original and 350 reduced sets.
{"title":"Coarray sampling methods for forward looking IVUS imaging","authors":"C. Tekes, M. Karaman","doi":"10.1109/BIYOMUT.2009.5130318","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130318","url":null,"abstract":"Forward looking intravascular ultrasound (IVUS) imaging with ring arrays can produce real time volumetric imaging. Due to the limited catheter size, data acquisition and image reconstruction are based on synthetic phased array processing to reduce the motion artifacts. The number of signal firing/receivening steps must be kept small. This can be achieved by reducing the redundant spatial frequency components. For this purpose, we explore different sampling methods. We tested the imaging performance of coarrays with different sampling schemes on the simulated point spred functions of original and control coarray sets. Simulation results show equivalent performance in 40 dB for an annular ring array of 64 elements with 2049 original and 350 reduced sets.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116438851","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 : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130366
I. Sen, M. Saraçlar, Y. Kahya
The aim of this study is to localize the pathological compartments of the lung based on the characteristics of the modified pulmonary sounds. Sound signals recorded simultaneously at more than one point on the posterior chest wall are subjected to source separation methods in order to separate sound components associated with the disease. For this study, Basic Independent Component Analysis (BICA), Separation By Autocovariances (SBA) and Convolutive Blind Source Separation (CBSS), out of various source separation methods, are adopted and used. The measure proposed to find the most similar among the extracted independent components to the true source is kurtosis and Kullback-Liebler (K-L) distance. After the similarities between measured signals and the chosen component are located as coefficients onto the recording points on the chest wall and thereby formed matrix is visually improved via interpolation, a two-dimensional map is obtained, although with low resolution, showing estimated pathology source location and audibility distribution of the adventitious sound component around this source. This study is intended to be a pioneer to studies on acoustic-based respiratory system imaging which can function as an alternative to computer chest tomography in some necessary circumstances, and complementary in others.
{"title":"Multi-channel acoustic mapping of respiratory system based on adventitious sound source separation","authors":"I. Sen, M. Saraçlar, Y. Kahya","doi":"10.1109/BIYOMUT.2009.5130366","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130366","url":null,"abstract":"The aim of this study is to localize the pathological compartments of the lung based on the characteristics of the modified pulmonary sounds. Sound signals recorded simultaneously at more than one point on the posterior chest wall are subjected to source separation methods in order to separate sound components associated with the disease. For this study, Basic Independent Component Analysis (BICA), Separation By Autocovariances (SBA) and Convolutive Blind Source Separation (CBSS), out of various source separation methods, are adopted and used. The measure proposed to find the most similar among the extracted independent components to the true source is kurtosis and Kullback-Liebler (K-L) distance. After the similarities between measured signals and the chosen component are located as coefficients onto the recording points on the chest wall and thereby formed matrix is visually improved via interpolation, a two-dimensional map is obtained, although with low resolution, showing estimated pathology source location and audibility distribution of the adventitious sound component around this source. This study is intended to be a pioneer to studies on acoustic-based respiratory system imaging which can function as an alternative to computer chest tomography in some necessary circumstances, and complementary in others.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130726102","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 : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130285
S. Okkesim, M. H. Asyali, S. Kara, M. Kaya, İdris Ardiç
Although, stress, sleep deprivation, excessive fatigue and inattention are common health problem in advanced society, there are many methodological problems that make it difficult to measure these emotional states in clinical situations. The main goal of this study is to investigate whether variation of stress due to treatment techniques used in a hospital setting can be successfully assessed and/or quantized using physiological variables. To this end, blood volume pulse and skin conductance signals of 8 patients who underwent angiography operation at the Cardiology Center of Erciyes University (Kayseri, Turkey), are obtained. Recordings were done at three stages: one hour before, during, and one hour after the angiography test. Our preliminary results indicate that the changes in the physiological variables across different subjects are remarkably consistent. This promising result is motivating us to consider and include other possible physiological variables and/or signals in our recording scheme to quantitatively assess changes in the emotional state of subjects undergoing critical operations.
{"title":"Evaluation of anxiety related changes in skin conductance and blood volume pulse signals during coronary angiography","authors":"S. Okkesim, M. H. Asyali, S. Kara, M. Kaya, İdris Ardiç","doi":"10.1109/BIYOMUT.2009.5130285","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130285","url":null,"abstract":"Although, stress, sleep deprivation, excessive fatigue and inattention are common health problem in advanced society, there are many methodological problems that make it difficult to measure these emotional states in clinical situations. The main goal of this study is to investigate whether variation of stress due to treatment techniques used in a hospital setting can be successfully assessed and/or quantized using physiological variables. To this end, blood volume pulse and skin conductance signals of 8 patients who underwent angiography operation at the Cardiology Center of Erciyes University (Kayseri, Turkey), are obtained. Recordings were done at three stages: one hour before, during, and one hour after the angiography test. Our preliminary results indicate that the changes in the physiological variables across different subjects are remarkably consistent. This promising result is motivating us to consider and include other possible physiological variables and/or signals in our recording scheme to quantitatively assess changes in the emotional state of subjects undergoing critical operations.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134259303","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 : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130350
D. G. Duru, M. Ozkan
In diffusion tensor magnetic resonance imaging (DT-MRI), each voxel is assigned a tensor that describes local water diffusion. In this study, the eigenvectors of the diffusion tensor are analyzed based on stack linked list application. The aim of the study is to develop a reliable and rapid tractography algorithm. The analyzed image sample consists of 60 diffusion weighted human brain images and a null image namely the T2 image creating a set of intensity images of size 256×256×60×30. The eigenvectors of D is calculated in every pixel, apparent diffusion coefficient ADC is represented with respect to D. The idea of the proposed method is to accomplish the fiber pathway by starting from a single, selected node taking every node in other words all the information of the eigenvector of the whole brain into account. Via the proposed study, an elimination method for the main drawback in DTI literature namely the uncertainty regions are aimed.
{"title":"Fiber tracking using recursive stack data structure","authors":"D. G. Duru, M. Ozkan","doi":"10.1109/BIYOMUT.2009.5130350","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130350","url":null,"abstract":"In diffusion tensor magnetic resonance imaging (DT-MRI), each voxel is assigned a tensor that describes local water diffusion. In this study, the eigenvectors of the diffusion tensor are analyzed based on stack linked list application. The aim of the study is to develop a reliable and rapid tractography algorithm. The analyzed image sample consists of 60 diffusion weighted human brain images and a null image namely the T2 image creating a set of intensity images of size 256×256×60×30. The eigenvectors of D is calculated in every pixel, apparent diffusion coefficient ADC is represented with respect to D. The idea of the proposed method is to accomplish the fiber pathway by starting from a single, selected node taking every node in other words all the information of the eigenvector of the whole brain into account. Via the proposed study, an elimination method for the main drawback in DTI literature namely the uncertainty regions are aimed.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134486632","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 : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130332
Deniz Nevsehirli, Ata Akin
Effect of consecutive maximal dry breath-holds was compared between two groups of free divers with different experience levels and a control group. Hemoglobin concentration ([Hb], by functional near infrared spectroscopy, fNIRS), heart rate and systemic oxygen saturation (SO2, by pulse oxymetry) measurements were performed during four consecutive maximal dry breath-holdsChange in [Hb] (Δ[Hb]), change in SO2 (ΔSO2) and breath-hold indices (BHI_Δ[Hb], BHI_ΔSO2) normalized to hold durations calculated for each breath-hold. Analyses over these indices showed statistical difference between groups (p≪5×10−5 for both indices). Free diver groups exhibited a higher slope of increase of the indices among consecutive breath holds compared to the control group elucidating an enhanced reactivity to hypoxia. Our results indicate that cerebrovascular reactivity to hypercapnia can be learned and trained and the level of reactivity can be reliably quantified by fNIRS.
{"title":"Serbest dalgiclarda iYKAS ile serebrovaskuler reaktivite olcumu","authors":"Deniz Nevsehirli, Ata Akin","doi":"10.1109/BIYOMUT.2009.5130332","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130332","url":null,"abstract":"Effect of consecutive maximal dry breath-holds was compared between two groups of free divers with different experience levels and a control group. Hemoglobin concentration ([Hb], by functional near infrared spectroscopy, fNIRS), heart rate and systemic oxygen saturation (SO2, by pulse oxymetry) measurements were performed during four consecutive maximal dry breath-holdsChange in [Hb] (Δ[Hb]), change in SO2 (ΔSO2) and breath-hold indices (BHI_Δ[Hb], BHI_ΔSO2) normalized to hold durations calculated for each breath-hold. Analyses over these indices showed statistical difference between groups (p≪5×10−5 for both indices). Free diver groups exhibited a higher slope of increase of the indices among consecutive breath holds compared to the control group elucidating an enhanced reactivity to hypoxia. Our results indicate that cerebrovascular reactivity to hypercapnia can be learned and trained and the level of reactivity can be reliably quantified by fNIRS.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130783548","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 : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130320
M. Ozden, Nergis Karadoruk, I. Karagoz
In this study, an image processing algorithm is developed for epiretinal implants. In this algorithm, it is presented an approach for adaptive frequency control that is one of the important parameters to generate stimuli. Standard 240×320 pixels video images in RGB format are processed as 10×10 pixel blocks. Consequently, it is designed to activate 24×32 pixels electrode matrix. As a retinal filter Gabor filter is preferred to DoG filter that is usually used in literature. The changes in pixels are modeled by using temporal filter. The results that belong to study and forward opinions are also presented.
{"title":"Image processing method for artificial sight systems based on contrast information","authors":"M. Ozden, Nergis Karadoruk, I. Karagoz","doi":"10.1109/BIYOMUT.2009.5130320","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130320","url":null,"abstract":"In this study, an image processing algorithm is developed for epiretinal implants. In this algorithm, it is presented an approach for adaptive frequency control that is one of the important parameters to generate stimuli. Standard 240×320 pixels video images in RGB format are processed as 10×10 pixel blocks. Consequently, it is designed to activate 24×32 pixels electrode matrix. As a retinal filter Gabor filter is preferred to DoG filter that is usually used in literature. The changes in pixels are modeled by using temporal filter. The results that belong to study and forward opinions are also presented.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"546 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133497355","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 : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130301
R. U. Tok, Tamer Olmez, A. Akın
In this study, we developed a Monte Carlo Simulation for forward problem of photon migration in non-homogeneous medium. We validated our program against tMCimg, developed by Boas and colleagues, for some simple geometries. Eventually our program gives reasonable results for mediums which are not too complex but for more complex mediums because of very long computational time, it's not practical although theoretically there is no problem.
{"title":"A Monte Carlo Simulation for photon migration in non-homogeneous medium","authors":"R. U. Tok, Tamer Olmez, A. Akın","doi":"10.1109/BIYOMUT.2009.5130301","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130301","url":null,"abstract":"In this study, we developed a Monte Carlo Simulation for forward problem of photon migration in non-homogeneous medium. We validated our program against tMCimg, developed by Boas and colleagues, for some simple geometries. Eventually our program gives reasonable results for mediums which are not too complex but for more complex mediums because of very long computational time, it's not practical although theoretically there is no problem.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133449188","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 : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130323
B. Uzun, O. Baran, H. Havitcioglu
There are various extremity lengthening methods in the literature. Lentghening with intramedullary nails is also important method which is emphasized recent years. In this study, in the light of previous studies, it is aimed to develop a new expandable intramedullary system providing lengthening in order to remove previous problems and complications and to annihilate leg length discrepancies at present and future without second surgical intervention as far as possibble by lenghtening the intramedullary nail.
{"title":"Extendable intramedullary nail with mechanical loading","authors":"B. Uzun, O. Baran, H. Havitcioglu","doi":"10.1109/BIYOMUT.2009.5130323","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130323","url":null,"abstract":"There are various extremity lengthening methods in the literature. Lentghening with intramedullary nails is also important method which is emphasized recent years. In this study, in the light of previous studies, it is aimed to develop a new expandable intramedullary system providing lengthening in order to remove previous problems and complications and to annihilate leg length discrepancies at present and future without second surgical intervention as far as possibble by lenghtening the intramedullary nail.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"15 11-12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114012220","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 : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130347
A. Sennaroğlu, M. Gulsoy, H. Kalaycıoğlu, N. Topaloglu, A. Kurt, A. Sennaroğlu, M. Gulsoy
Laser tissue welding predosimetry studies are performed on Wistar rat skin by using diode-pumped and fiber-coupled Thulium (Tm:YAP) laser system emitting at 1980-nm, which is developed for medical applications. The success of laser tissue welding at 100 mW ve 160 mW of Tm:YAP laser powers is analyzed by macroscopy and histology results. Tm:YAP laser dosimetry of 100 mW, 5 second (34,66 W/cm2) is found successful for tissue welding studies.
{"title":"Tissue welding by Thulium laser system: Predosimetry studies","authors":"A. Sennaroğlu, M. Gulsoy, H. Kalaycıoğlu, N. Topaloglu, A. Kurt, A. Sennaroğlu, M. Gulsoy","doi":"10.1109/BIYOMUT.2009.5130347","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130347","url":null,"abstract":"Laser tissue welding predosimetry studies are performed on Wistar rat skin by using diode-pumped and fiber-coupled Thulium (Tm:YAP) laser system emitting at 1980-nm, which is developed for medical applications. The success of laser tissue welding at 100 mW ve 160 mW of Tm:YAP laser powers is analyzed by macroscopy and histology results. Tm:YAP laser dosimetry of 100 mW, 5 second (34,66 W/cm2) is found successful for tissue welding studies.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114900550","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 : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130346
Alper Akkaya, N. Pazarlıoğlu
Processed synthetic polymers used in medical textile are used directly or functionalized by immobilization of bioactive molecules. Textile products made by synthetic polymers are durable, resistant to chemical reactions and have inert structures. Textile products made by synthetic polymers usually have not functional groups for immobilization. So modification could be done for formation of functional groups. Immobilization of bioactive molecules could be done by functional groups. In this study, thrombin was immobilized to textile products made by synthetic polymers. So Textile products made by synthetic polymers was added a new character which was blood stopper. The product was reliable because of source.
{"title":"Immobilization of thrombin to bio/chemically modified synthetic fabrics","authors":"Alper Akkaya, N. Pazarlıoğlu","doi":"10.1109/BIYOMUT.2009.5130346","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130346","url":null,"abstract":"Processed synthetic polymers used in medical textile are used directly or functionalized by immobilization of bioactive molecules. Textile products made by synthetic polymers are durable, resistant to chemical reactions and have inert structures. Textile products made by synthetic polymers usually have not functional groups for immobilization. So modification could be done for formation of functional groups. Immobilization of bioactive molecules could be done by functional groups. In this study, thrombin was immobilized to textile products made by synthetic polymers. So Textile products made by synthetic polymers was added a new character which was blood stopper. The product was reliable because of source.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128310858","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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