2015 19th National Biomedical Engineering Meeting (BIYOMUT)最新文献

{"title":"Effect of finite element model geometry on biomechanical parameters of the cervical spine","authors":"I. Zafarparandeh, D. Erbulut, A. Ozer","doi":"10.1109/BIYOMUT.2015.7369452","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2015.7369452","url":null,"abstract":"Various finite element (FE) models of the cervical spine have been proposed in the literature. Most of the FE models assume that symmetry occurs about mid-sagittal plane while some other considers the accurate asymmetric geometry of the cervical spine. The proposed models are used to predict the motion response and internal biomechanics under different loading types. The aim of this paper is to investigate the influence of change in the geometry of the cervical spine on the predicted biomechanical parameters by the FE model.","PeriodicalId":143218,"journal":{"name":"2015 19th National Biomedical Engineering Meeting (BIYOMUT)","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122672724","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}

{"title":"Vibrotactile sensitivity of freely behaving rats and operant conditioning by intracortical microstimulation","authors":"İsmail Devecioğlu, Burak Guclu","doi":"10.1109/BIYOMUT.2015.7369454","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2015.7369454","url":null,"abstract":"In this study, 5 adult Wistar albino rats were trained to detect presence or absence of mechanical vibrations applied on the volar surface of their hindpaws. Vibrotactile sensitivity of glabrous skin of these rats were psychophysically tested at 3 frequencies. 3 out of 5 rats were implanted with microwire arrays in their primary somatosensory cortex hindpaw representation and trained to detect the presence or absence of electrical current pulses injected through these electrodes. Rats were psychophysically tested as in tactile experiments. The results indicate that intracortical microstimulation generates neural activity which results in similar psychophysical performance as in the tactile experiments. We are working to utilize this principle in somatosensory neuroprostheses.","PeriodicalId":143218,"journal":{"name":"2015 19th National Biomedical Engineering Meeting (BIYOMUT)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131860997","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}

{"title":"Low phase noise phase locked loop frequency synthesizer design for breast cancer detection","authors":"Mahsa Keykhali, Nevzat Guneri Genger","doi":"10.1109/BIYOMUT.2015.7369449","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2015.7369449","url":null,"abstract":"Harmonic Motion Microwave Doppler Imaging (HMMDI) method is recently proposed as a non-invasive hybrid breast imaging technique for tumor detection. In this method, local harmonic motion is generated in the tissue using a focused ultrasound probe. A narrow-band microwave signal is transmitted to the tissue. The Doppler component of the scattered signal, which depends on the dielectric and elastic properties of the vibrating region, is sensed [1]. Since the measurements obtained from HMMDI is directly related with phase noise, there are some studies to reduce phase noise of RF transmitting signal. In this work having a pure signal with ultra-low phase noise (-140dBc/Hz@1MHz) is one of the main goals to achieve the desired results at the proceeding steps. In addition the signal should be in (2-6GHz) frequency ranges. Therefore, modelling a low phase noise PLL operating in high frequency ranges with the help of measurements and microwave simulation tool (ADS) planned. According to the simulation results the proposed VCO provided a Phase Noise of about -137.64dBc/Hz @1MHz that is very acceptable in comparison to other provided complex VCO structures [2-5]. In addition generate 2.76 GH oscillating frequency.","PeriodicalId":143218,"journal":{"name":"2015 19th National Biomedical Engineering Meeting (BIYOMUT)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134600402","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}

{"title":"Classification of hand movements related to grasp by using EMG signals","authors":"S. B. Akben","doi":"10.1109/BIYOMUT.2015.7369445","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2015.7369445","url":null,"abstract":"This study is aimed classification of Electromyography signals associated with the six hand movements which can be considered as daily hand grasps. In first stage of the study, histogram values of all EMG signals were calculated. Then, by calculating the average value of the histogram values for each of six hand gestures, common features of the movement was determined. Separability into only two or three classes of data have been identified when these average values were examined. Therefore the histogram data were previously divided into three classes. Then each of these classes were divided into two classes. As a result six different classes were created. On the other hand the same cascade classification process was evaluated by dividing three classes of each of previously obtained two classes. When two different cascade classification results were compared it was determined that the 100% success rate can be achieved by dividing three classes into previously obtained two classes. As a result, for the classification of electromyography signals associated with hand grasp movement it has been proposed a very successful and efficient feature extraction and cascade classification method.","PeriodicalId":143218,"journal":{"name":"2015 19th National Biomedical Engineering Meeting (BIYOMUT)","volume":"50 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131887277","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}

{"title":"Comparison of low and high grade glioma maps","authors":"Y. Cotur, M. Ozkan, A. Demir, Hale Turnaoğlu, A. Ağıldere, O. Alkan, A. Uluğ","doi":"10.1109/BIYOMUT.2015.7369459","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2015.7369459","url":null,"abstract":"It is crucial to detect the locations of brain tumors for the diagnosis. The aim of this study was the generation and comparison of the high and low-grade probabilistic brain tumor maps to present the tumor observance frequencies in the brain tissue. T1-weighted, pre-operated data from 162 brain tumor patients are examined during the study. Although most of high-grade tumors are located around the superior and right lateral regions of sub-ventricular zone, low-grade gliomas are mostly observed in the posterior part of the sub-ventricular zone. Moreover, since all types of tumors are gathered close to the sub-ventricular zone, our results support the theory proposing that there is a relation between gliomas and sub-ventricular zone, which is the origin of glial cells.","PeriodicalId":143218,"journal":{"name":"2015 19th National Biomedical Engineering Meeting (BIYOMUT)","volume":"156 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127357245","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}

{"title":"Hemodynamic examination of brain aneurysm based on Computational Fluid Dynamics (CFD) simulations","authors":"Baris Suslu, A. Olcay, B. Hakyemez","doi":"10.1109/BIYOMUT.2015.7369450","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2015.7369450","url":null,"abstract":"Aneurysms that bulge on intracranial carotid arteries can be detected by using medical imaging technologies. Aneurysm, which is detected in this scope of study, is isolated from the rest of the arteries and vessel cloud with the help of Computer Aided Design (CAD) programme. Obtained geometry is transferred into Computational Fluid Dynamics (CFD) with applicable extension. Drop in pressure, velocity values (x, y, z plane) and wall shear stress (WWS) is recorded through the aneurysm and arteries which aneurysm initialize on. At the same time, this study gave us an opportunity to analyze parameters that affect aneurysm and its' around via visual way. We observed homogenous WWS distribution and consistent velocity values in our simulation outputs. In addition, change in pressure through the aneurysm was recorded. As a result, patient-specific investigation of hemodynamics parameters in-vivo is a quite challenging problem so that image-based CFD is powerful and convenient tool to acquire mentioned parameters for the diagnosis and treatment procedure.","PeriodicalId":143218,"journal":{"name":"2015 19th National Biomedical Engineering Meeting (BIYOMUT)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114274936","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}

{"title":"Numerical analysis of spinal cord stimulation with triple leads with guarded cathode","authors":"Çağlayan Durlu, Reyhan Zengin, N. G. Gencer, F. Kucukdeveci","doi":"10.1109/BIYOMUT.2015.7369456","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2015.7369456","url":null,"abstract":"Spinal cord stimulation (SCS) is a alternative treatment method for drug free treatment for chronic pain. Electrodes are placed to Spinal column's epidural tissue to blocked transfer of pain to brain and to stimulate dorsally column of pain. Today there are two two designs of electrode which are used in Spinal cord stimulation (SCS): a percutaneous (PERC) design, consisting of annular electrodes distributed along a flexible cylindrical shaft, which is inserted with a hypodermic needle; and a laminectomy/paddle design (LAM) implanted during a surgical laminectomy, consisting of a grid of rectangular electrodes on a flexible planar substrate. Also, only controlled percutaneous cathode electrode is used for stimulation a certain area in spinal cord. In this study, numerical studies of direct current application are done using percutaneous lead with 3-electrode model. Spinal canal is modeled in four layers which are epidural fat, CSF, white matter and gray matter tissues as 3D with using Finite Element Method (FEM). The lead with 3-electrode is placed in epidural fat. Anode and cathode electrodes are stimulated so as to flow current respectively 0.25mA and -2mA. At the contact surface of electrodes and epidural fat, obtained maximum current density is 128.161 mA/cm2 and this value is in the safety limits. The maximum electrical voltage occurred in the spinal canal is 2.133 V and this value is in the interval of perception value for patients.","PeriodicalId":143218,"journal":{"name":"2015 19th National Biomedical Engineering Meeting (BIYOMUT)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130036345","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}

{"title":"Use of entropy, spectral parameters and recurrence quantification analysis for the evaluation of muscle fatigue from surface electromyography","authors":"O. Sayli, H. B. Çotuk","doi":"10.1109/BIYOMUT.2015.7369451","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2015.7369451","url":null,"abstract":"Surface electromyography (EMG) is commonly used to detect muscle activation, to find muscle activation level compared to a reference-especially at low force levels- and to evaluate muscle fatigue level. EMG signal is nonstationary and is the response of complex system. The most commonly used method to assess muscle fatigue is to compute decline in mean (MNF) and median (MDF) frequencies which are found from power spectrum of EMG signal. As the muscle continuously passes to fatigue state during a prolonged muscle activation, conduction velocity declines whereas motor unit synchronization increases. The motor unit synchronization should effect EMG signal complexity. Considering this, the EMG signals are analysed with entropy and recurrence quantification analysis (RQA) methods along with MNF and MCF parameters since entropy and RQA methods give measure to determine complexity changes in the signal. It was found that MNF decline is accompanied with entropy decline and %DET increase as the fatigue occurs. These findings could be explained by increased regularity caused by motor unit synchronization.","PeriodicalId":143218,"journal":{"name":"2015 19th National Biomedical Engineering Meeting (BIYOMUT)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130702456","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}

{"title":"Histological study of layer thickness in different cortical areas in rat","authors":"Sedef Yusufogullari, Deniz Kılınç, B. Vardar, Burak Guclu","doi":"10.1109/BIYOMUT.2015.7369435","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2015.7369435","url":null,"abstract":"In this study, 10 Wistar albino rats were used to study cortical layer thicknesses in three brain regions (Somatosensory cortex hind limb representaion (S1HL), Barrel field (S1BF) and Motor cortex (M1). Morphometric measurements were performed on Nissl stained brain sections. Results showed that there are significant differences in layers II, III, IV, V across these brain regions. The importance of this is discussed in relation to neuroprosthetic applications.","PeriodicalId":143218,"journal":{"name":"2015 19th National Biomedical Engineering Meeting (BIYOMUT)","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115537147","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}

{"title":"Designing and prototyping of a new uterine manipulator which will overcome drawbacks of conventional uterine manipulators and assist laparoscopic hysterectomies","authors":"Serkan Dikici, H. Eser, B. Aldemir, E. Gezgin, Ozgun Baser, Savaş Şahin, H. Oflaz","doi":"10.1109/BIYOMUT.2015.7369437","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2015.7369437","url":null,"abstract":"Hysterectomy, that is removal of uterus, is one of the most common major operations in gynecologic surgeries. Laparoscopy technique is preferred in hysterectomy because of its advantages such as lower intra-operative blood loss, decreased surrounding tissue/organ damage, less operating time, lower post-operative infection and frequency of fever, shorter duration of hospitalization and post-operative returning time to normal activity. During total laparoscopic hysterectomy, first uterine vessels and ligaments are cauterized respectively, and then cervicovaginal connections are cauterized and coagulated to remove uterus completely. Uterine manipulators are used during laparoscopy to maximize the endoscopic vision of surgeons by moving related organs. However, conventional uterine manipulators have important drawbacks particularly to move uterus in three dimensions and to show cervicovaginal landmark during laparoscopic circular cauterization which is difficult and hand skill required process, and amputation of the uterine cervix. A new transvaginal uterine manipulator may overcome these important drawbacks of these currently available devices. For this reason, a 3 dimensional (3D) scanning technique was used to obtain real world data such as uterine dimensions and computer aided design software is used in designing of the new manipulator and then 3D printer was used in prototyping. Special light emitting diodes (LEDs) were mounted on the cervical cap of the manipulator to guide light beams from inside of cervicovaginal tissue to abdominal cavity to facilitate the visualization of tissue landmarks. In brief, structural synthesis, CAD and rapid prototyping of parallel manipulator with 2-dof and which allows the uterus to be manipulated in both anterior posterior and lateral axis was performed in the scope of this thesis. Furthermore, a circular LED system was designed and implemented on system to ease the determination of cervicovaginal landmark. In the light of the findings acquired from the study, designed manipulator has ability to manipulate uterus in anterior posterior and lateral axis. Moreover, LED illumination system which can be detected easily by the laparoscope is successfully implemented on the manipulator's cervical cap.","PeriodicalId":143218,"journal":{"name":"2015 19th National Biomedical Engineering Meeting (BIYOMUT)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127884742","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}