Pub Date : 2010-04-21DOI: 10.1109/BIYOMUT.2010.5479796
Serdar Yilmaz, N. Arslan, O. Toker, H. Sedef
Patients, with renal failure, can be taken to the hemodialysis after fistula or graft surgery. In hemodialysis, blood is pumped with the help of the artificial kidney machine and the waste product from the blood is filtered and blood is returned to the patients after cleaning process. AV graft implantation is the creation of a polytetrafluoroethylene (PTFE) bridge a bridge between the arteries and veins. In this study simulation of the pulsatile flow signal in the AV graft and vein connection is aimed experimentally. Suitable for this purpose AC centrifugal pump, pump driver card, pneumatic valve, data acquisition card, flow meters and other equipments are used for close loop control mechanism in laboratory. Pulsatile waveforms obtained by AC centrifugal pump and pneumatic valve performance are compared to each other in close loop control. The results showed that AV graft signal can be modeled by AC centrifugal pump and pneumatic valve successfully. Current study could be a guide and motivation to the establishment of the different experimental systems in future.
{"title":"In vitro pulsatile flow waveform simulation and comparison using AC pump and proportional pneumatic valve","authors":"Serdar Yilmaz, N. Arslan, O. Toker, H. Sedef","doi":"10.1109/BIYOMUT.2010.5479796","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2010.5479796","url":null,"abstract":"Patients, with renal failure, can be taken to the hemodialysis after fistula or graft surgery. In hemodialysis, blood is pumped with the help of the artificial kidney machine and the waste product from the blood is filtered and blood is returned to the patients after cleaning process. AV graft implantation is the creation of a polytetrafluoroethylene (PTFE) bridge a bridge between the arteries and veins. In this study simulation of the pulsatile flow signal in the AV graft and vein connection is aimed experimentally. Suitable for this purpose AC centrifugal pump, pump driver card, pneumatic valve, data acquisition card, flow meters and other equipments are used for close loop control mechanism in laboratory. Pulsatile waveforms obtained by AC centrifugal pump and pneumatic valve performance are compared to each other in close loop control. The results showed that AV graft signal can be modeled by AC centrifugal pump and pneumatic valve successfully. Current study could be a guide and motivation to the establishment of the different experimental systems in future.","PeriodicalId":180275,"journal":{"name":"2010 15th National Biomedical Engineering Meeting","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133221433","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 : 2010-04-21DOI: 10.1109/BIYOMUT.2010.5479868
Abidin Altintas, C. Unsalan, A. U. Keskin, F. Yencilek
Extracorporeal Shock Wave Lithotrispy (ESWL) is a procedure based on sound waves to crash kidney stones on the focus. The sound waves are sent to the body of patient when the kidney stone is not even on the focus. When the stone is not on the focus, the sound waves can damage the soft tissue of the kidney. This damage can be prevented by a feedback mechanism that determines the place of kidney stones depending on the images taken from ESWL device. In this study, an automated system is developed to detect kidney stones from X ray images.
{"title":"Detection of kidney stones from X-ray images","authors":"Abidin Altintas, C. Unsalan, A. U. Keskin, F. Yencilek","doi":"10.1109/BIYOMUT.2010.5479868","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2010.5479868","url":null,"abstract":"Extracorporeal Shock Wave Lithotrispy (ESWL) is a procedure based on sound waves to crash kidney stones on the focus. The sound waves are sent to the body of patient when the kidney stone is not even on the focus. When the stone is not on the focus, the sound waves can damage the soft tissue of the kidney. This damage can be prevented by a feedback mechanism that determines the place of kidney stones depending on the images taken from ESWL device. In this study, an automated system is developed to detect kidney stones from X ray images.","PeriodicalId":180275,"journal":{"name":"2010 15th National Biomedical Engineering Meeting","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126581295","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 : 2010-04-21DOI: 10.1109/BIYOMUT.2010.5479812
Bulent Perktas, M. Aksahin
Today, the increasing contribution of biomedical devices is well known for diagnosis and treatment of common diseases. The heart rate is an important parameter among this diagnosis. The heart rate is the total number performed heart beats in a minute. In this study, the heart rate is detected proportionally to the intensity oxyhemoglobin inside the finger. Oxygen is greatly carried with the hemoglobin units in the blood. When oxygen-rich blood reaches the finger tissues, the absorption against light of the tissue will change. To detect this difference, finger is illuminated with the help of a red LED and to detect this information a probe is designed with the help of a fotoresistor. A system design have been made announcing the heart rate obtained from the designed probe in three different languages.
{"title":"Designing 3 language talkative system of heart beater","authors":"Bulent Perktas, M. Aksahin","doi":"10.1109/BIYOMUT.2010.5479812","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2010.5479812","url":null,"abstract":"Today, the increasing contribution of biomedical devices is well known for diagnosis and treatment of common diseases. The heart rate is an important parameter among this diagnosis. The heart rate is the total number performed heart beats in a minute. In this study, the heart rate is detected proportionally to the intensity oxyhemoglobin inside the finger. Oxygen is greatly carried with the hemoglobin units in the blood. When oxygen-rich blood reaches the finger tissues, the absorption against light of the tissue will change. To detect this difference, finger is illuminated with the help of a red LED and to detect this information a probe is designed with the help of a fotoresistor. A system design have been made announcing the heart rate obtained from the designed probe in three different languages.","PeriodicalId":180275,"journal":{"name":"2010 15th National Biomedical Engineering Meeting","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115514900","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 : 2010-04-21DOI: 10.1109/BIYOMUT.2010.5479866
A. U. Keskin, Cihat Koyuncu
A simple liquid sensing and measurement system for determining the level of cryogen in a tissue cryopreservation container is described. Liquid-gas boundary determination is made by detecting a thermal transient of the series-connected light emitting diodes. An electronic control and display unit located on the outer wall of the container indicates the level of cryogenic liquid, and alarms the operator if it reaches a pre-determined critical level.
{"title":"A method for liquid cryogen level measurement in cryopreservation containers","authors":"A. U. Keskin, Cihat Koyuncu","doi":"10.1109/BIYOMUT.2010.5479866","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2010.5479866","url":null,"abstract":"A simple liquid sensing and measurement system for determining the level of cryogen in a tissue cryopreservation container is described. Liquid-gas boundary determination is made by detecting a thermal transient of the series-connected light emitting diodes. An electronic control and display unit located on the outer wall of the container indicates the level of cryogenic liquid, and alarms the operator if it reaches a pre-determined critical level.","PeriodicalId":180275,"journal":{"name":"2010 15th National Biomedical Engineering Meeting","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123487316","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 : 2010-04-21DOI: 10.1109/BIYOMUT.2010.5479810
M. Aksahin, S. Aydın, H. Fırat, O. Eroğul, S. Ardıç
In this study, to obtain high quality signal features in discriminating the Central Sleep Apnea (CSA) and Obstructive Sleep Apnea (OSA) from controls, both linear and nonlinear EEG synchronization methods so called Coherence Function (CF) and Mutual Information (MI) are performed. For this purpose, sleep EEG series data collected from patients and healthy volunteers are classified by using a well known and widely used Feed-Forward Neural Network (FFNN) with respect to synchronic activities between C3 and C4 recordings. The results show that the degree of central EEG synchronization during night sleep is closely linked to sleep disorders like CSA and OSA. The MI and CF provide information in meaningful collaboration to support the clinical findings. These three groups were defined with a medical expert and can be very successfully classified by using the FFNN having two hidden layers with the average area of CF curves ranged form 0 Hz to 10 Hz and the average MI values are assigned as two features. This study is a preliminary study for classifying types of sleep apnea.
{"title":"Classification of sleep apnea types using EEG synchronization criteria","authors":"M. Aksahin, S. Aydın, H. Fırat, O. Eroğul, S. Ardıç","doi":"10.1109/BIYOMUT.2010.5479810","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2010.5479810","url":null,"abstract":"In this study, to obtain high quality signal features in discriminating the Central Sleep Apnea (CSA) and Obstructive Sleep Apnea (OSA) from controls, both linear and nonlinear EEG synchronization methods so called Coherence Function (CF) and Mutual Information (MI) are performed. For this purpose, sleep EEG series data collected from patients and healthy volunteers are classified by using a well known and widely used Feed-Forward Neural Network (FFNN) with respect to synchronic activities between C3 and C4 recordings. The results show that the degree of central EEG synchronization during night sleep is closely linked to sleep disorders like CSA and OSA. The MI and CF provide information in meaningful collaboration to support the clinical findings. These three groups were defined with a medical expert and can be very successfully classified by using the FFNN having two hidden layers with the average area of CF curves ranged form 0 Hz to 10 Hz and the average MI values are assigned as two features. This study is a preliminary study for classifying types of sleep apnea.","PeriodicalId":180275,"journal":{"name":"2010 15th National Biomedical Engineering Meeting","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123600828","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 : 2010-04-21DOI: 10.1109/BIYOMUT.2010.5479865
Giray Girişken, A. Tas
Brushite (DCPD, CaHPO4·2H2O, dicalcium phosphate dihydrate) and octacalcium phosphate (OCP, Ca8(HPO4)2(PO4)4·5H2O) are two important biomineralization phases of the musculoskeletal system of living vertebrates which respectively crystallize in the very first instants of hard tissue formation accompanied by calcification, and then transform into the so-called bone mineral named as calcium-deficient hydroxyapatite (CDHA, Ca10-x(HPO4)x(PO4)6-x(OH)2-x). The utilization of these two phases in the surgical treatment of bone defects and voids has lately been the focus of interest of a significant number of research projects. Although the synthesis of DCPD is quite easy and reproducible, the same cannot be said for that of OCP. Biomineralization solutions which use DCPD as the starting material and can allow the economical transformation of DCPD into OCP have been developed in this study. This paper explains the preparation conditions of these solutions and elucidates the X-ray diffraction and infrared spectroscopy data of the phases formed.
{"title":"Development of biomineralization solutions to facilitate the transformation of brushite (CaHPO4·2H2O) into octacalcium phosphate (Ca8(HPO4)2(PO4)4·5H2O)","authors":"Giray Girişken, A. Tas","doi":"10.1109/BIYOMUT.2010.5479865","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2010.5479865","url":null,"abstract":"Brushite (DCPD, CaHPO<sub>4</sub>·2H<sub>2</sub>O, dicalcium phosphate dihydrate) and octacalcium phosphate (OCP, Ca<sub>8</sub>(HPO<sub>4</sub>)<sub>2</sub>(PO<sub>4</sub>)<sub>4</sub>·5H<sub>2</sub>O) are two important biomineralization phases of the musculoskeletal system of living vertebrates which respectively crystallize in the very first instants of hard tissue formation accompanied by calcification, and then transform into the so-called bone mineral named as calcium-deficient hydroxyapatite (CDHA, Ca<sub>10-x</sub>(HPO<sub>4</sub>)<sub>x</sub>(PO<sub>4</sub>)<sub>6-x</sub>(OH)<sub>2-x</sub>). The utilization of these two phases in the surgical treatment of bone defects and voids has lately been the focus of interest of a significant number of research projects. Although the synthesis of DCPD is quite easy and reproducible, the same cannot be said for that of OCP. Biomineralization solutions which use DCPD as the starting material and can allow the economical transformation of DCPD into OCP have been developed in this study. This paper explains the preparation conditions of these solutions and elucidates the X-ray diffraction and infrared spectroscopy data of the phases formed.","PeriodicalId":180275,"journal":{"name":"2010 15th National Biomedical Engineering Meeting","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116843732","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 : 2010-04-21DOI: 10.1109/BIYOMUT.2010.5479779
M. Solanki, V. Raja
This paper details progress towards a real time palpation simulator. We explore the potential of employing a mass spring system coupled with a haptic interface to realise this. Our motivation lies with enhancing the skills required to detect breast cancer as early as possible. However there are issues in emulating the behaviour of soft tissues using this approach, particularly if the composition of the model is inhomogeneous. Therefore our research is concerned with incorporating material properties and enhancing surface response upon contact, which is important for the simulator. We compare our model with analogous finite element models and discrete volumetric models to establish physical realism. Despite the absence of volumetric mesh, the initial evaluations show that the model can reproduce the presence of a tumour in a localised region. The model is receptive and can be reconfigured to simulate a variety of breast-tumour compositions. We look to integrate this with a deformable breast model that can be used to train the skills required for breast palpation.
{"title":"A reconfigurable model for virtual tumour detection within a breast","authors":"M. Solanki, V. Raja","doi":"10.1109/BIYOMUT.2010.5479779","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2010.5479779","url":null,"abstract":"This paper details progress towards a real time palpation simulator. We explore the potential of employing a mass spring system coupled with a haptic interface to realise this. Our motivation lies with enhancing the skills required to detect breast cancer as early as possible. However there are issues in emulating the behaviour of soft tissues using this approach, particularly if the composition of the model is inhomogeneous. Therefore our research is concerned with incorporating material properties and enhancing surface response upon contact, which is important for the simulator. We compare our model with analogous finite element models and discrete volumetric models to establish physical realism. Despite the absence of volumetric mesh, the initial evaluations show that the model can reproduce the presence of a tumour in a localised region. The model is receptive and can be reconfigured to simulate a variety of breast-tumour compositions. We look to integrate this with a deformable breast model that can be used to train the skills required for breast palpation.","PeriodicalId":180275,"journal":{"name":"2010 15th National Biomedical Engineering Meeting","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125939388","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 : 2010-04-21DOI: 10.1109/BIYOMUT.2010.5479740
M. Bilgili, B. Şahin, E. Şimşek, A. Yaşar
In this study, the effects of seasonal weather differences city on the bio-heat losses from the human body have been investigated in Antalya. For application, the monthly atmospheric temperature, relative humidity, wind speed and atmospheric pressure data, which are observed in 2006, have been used. The sensible and latent heat losses from the human body in terms of skin surface and respiration have been calculated and compared to each other. According to the obtained results, the latent and sensible heat losses from the human body have been varied considerably from season to season. Approximately ninety percent of bio-heat losses from the human body to the surrounding is caused by the skin and the rest of 10% by respiration.
{"title":"The investigation of heat loss transferred from the human body via respiration in Antalya city","authors":"M. Bilgili, B. Şahin, E. Şimşek, A. Yaşar","doi":"10.1109/BIYOMUT.2010.5479740","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2010.5479740","url":null,"abstract":"In this study, the effects of seasonal weather differences city on the bio-heat losses from the human body have been investigated in Antalya. For application, the monthly atmospheric temperature, relative humidity, wind speed and atmospheric pressure data, which are observed in 2006, have been used. The sensible and latent heat losses from the human body in terms of skin surface and respiration have been calculated and compared to each other. According to the obtained results, the latent and sensible heat losses from the human body have been varied considerably from season to season. Approximately ninety percent of bio-heat losses from the human body to the surrounding is caused by the skin and the rest of 10% by respiration.","PeriodicalId":180275,"journal":{"name":"2010 15th National Biomedical Engineering Meeting","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128965277","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 : 2010-04-21DOI: 10.1109/BIYOMUT.2010.5479833
B. Yilmaz, Eren Arıkan, M. H. Asyali
Sleep consists of REM and four non-REM stages. Determining a person's sleep stage in a certain part of night sleep is performed by the technical experts using the polysomnographic recordings acquired in special sleep laboratories. The acquisition of these recordings for the sleep characterization require not only the connection of various sensors and electrodes to the subject but also spending the night in a bed which is different from the subject's own bed. In this study we investigated the feasibility of using only an electrocardiographic holter device instead of a polysomnography system used in a sleep laboratory for the sleep study and phase determination. For this purpose, single lead ECG data obtained during the night sleep (mean sleep duration 7 hours) from 18 subjects (6 men) with ages between 20 and 67 were used for sleep staging based on R-R interval values. The validation was performed by the sleep stage data previously determined by the sleep experts. Phase determination consists of R-R interval computation, feature extraction and classification studies. The features used in this study were the median value, the difference between the 75 and 25 percentile values, and mean absolute deviations of the R-R intervals computed in each 30-second epoch. The k nearest neighbor (kNN) and quadratic discriminant analysis methods based on one-versus-others approach were used as the classification tools. In the testing procedure cross-validation was employed. As a result, out of awake stage and other five sleep stages four stages were classified accurately at a rate of greater than 80%.
{"title":"Use of kNN and quadratic discriminant analysis methods for sleep staging from single lead ECG recordings","authors":"B. Yilmaz, Eren Arıkan, M. H. Asyali","doi":"10.1109/BIYOMUT.2010.5479833","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2010.5479833","url":null,"abstract":"Sleep consists of REM and four non-REM stages. Determining a person's sleep stage in a certain part of night sleep is performed by the technical experts using the polysomnographic recordings acquired in special sleep laboratories. The acquisition of these recordings for the sleep characterization require not only the connection of various sensors and electrodes to the subject but also spending the night in a bed which is different from the subject's own bed. In this study we investigated the feasibility of using only an electrocardiographic holter device instead of a polysomnography system used in a sleep laboratory for the sleep study and phase determination. For this purpose, single lead ECG data obtained during the night sleep (mean sleep duration 7 hours) from 18 subjects (6 men) with ages between 20 and 67 were used for sleep staging based on R-R interval values. The validation was performed by the sleep stage data previously determined by the sleep experts. Phase determination consists of R-R interval computation, feature extraction and classification studies. The features used in this study were the median value, the difference between the 75 and 25 percentile values, and mean absolute deviations of the R-R intervals computed in each 30-second epoch. The k nearest neighbor (kNN) and quadratic discriminant analysis methods based on one-versus-others approach were used as the classification tools. In the testing procedure cross-validation was employed. As a result, out of awake stage and other five sleep stages four stages were classified accurately at a rate of greater than 80%.","PeriodicalId":180275,"journal":{"name":"2010 15th National Biomedical Engineering Meeting","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123162287","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 : 2010-04-21DOI: 10.1109/BIYOMUT.2010.5479849
F. Latifoğlu, Ayşegül Güven, Uğur Durmuş, A. Öner
Clinical Electrophysiologic tests derived from human eyes are the tests that use to review whole visual pathways and they are important for ophthalmology and neuro ophthalmology. Electroretinographies is one of the electrophysiological tests often used to investigate the electrical response of the retinal layers from retinal pigment epithelium up to the occipital cortex. ERG signals have two important amplitudes that are used to diagnose diseases by doctors. These are negative a wave and positive b wave. Implicit times of the a and b waves are also meaningful to diagnose. ERG signals have small amplitudes (about μV). Because of this reason it is significant to separate the signal from the noise and interference that occurs as a result of movement. In this study, we propose using a new technique, called the empirical mode decomposition to denoised ERG responses. The Empirical Mode Decomposition is a signal processing method for analyzing nonlinear and nonstationary signals. ERG signals which are nonstationary signals are decomposed into a series of Intrinsic Mode Functions and then noise and interference are eliminated. Finally ERG signals which have signal to noise ratio less or equal than 10 dB are reconstructed. As a result we successfully obtained denoised ERG signals.
{"title":"Denoising of Electroretinogram signals using empirical mode decomposition","authors":"F. Latifoğlu, Ayşegül Güven, Uğur Durmuş, A. Öner","doi":"10.1109/BIYOMUT.2010.5479849","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2010.5479849","url":null,"abstract":"Clinical Electrophysiologic tests derived from human eyes are the tests that use to review whole visual pathways and they are important for ophthalmology and neuro ophthalmology. Electroretinographies is one of the electrophysiological tests often used to investigate the electrical response of the retinal layers from retinal pigment epithelium up to the occipital cortex. ERG signals have two important amplitudes that are used to diagnose diseases by doctors. These are negative a wave and positive b wave. Implicit times of the a and b waves are also meaningful to diagnose. ERG signals have small amplitudes (about μV). Because of this reason it is significant to separate the signal from the noise and interference that occurs as a result of movement. In this study, we propose using a new technique, called the empirical mode decomposition to denoised ERG responses. The Empirical Mode Decomposition is a signal processing method for analyzing nonlinear and nonstationary signals. ERG signals which are nonstationary signals are decomposed into a series of Intrinsic Mode Functions and then noise and interference are eliminated. Finally ERG signals which have signal to noise ratio less or equal than 10 dB are reconstructed. As a result we successfully obtained denoised ERG signals.","PeriodicalId":180275,"journal":{"name":"2010 15th National Biomedical Engineering Meeting","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126420239","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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