2009 14th National Biomedical Engineering Meeting最新文献_第10页

Usage of statistical estimation method for the simultaneous mapping of inner and outer surfaces of the heart 利用统计估计法同时绘制心脏内外表面

2009 14th National Biomedical Engineering Meeting Pub Date : 2009-05-20 DOI: 10.1109/BIYOMUT.2009.5130288

U. Cunedioglu, Engin Baysoy, B. Yilmaz

{"title":"Usage of statistical estimation method for the simultaneous mapping of inner and outer surfaces of the heart","authors":"U. Cunedioglu, Engin Baysoy, B. Yilmaz","doi":"10.1109/BIYOMUT.2009.5130288","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130288","url":null,"abstract":"To characterize the cardiac rhythm disturbances catheter-based cardiac mapping approaches have become a common practice due to their minimal invasiveness. A multielectrode basket-shaped contact catheter and the multielectrode intravenous catheter are two types of the used catheters. Catheter based approaches provide mapping of the one surface at a time. Therefore, there is a need for a method that can achieve mapping of the inner (endocard) and outer (epicard) surfaces of the heart in one heart beat. In this study, for simultaneous mapping of epi/endocardial surfaces multielectrode basket-shaped catheters and intravenous catheters we used statistical estimation method. In order to test this approach we used three dimensional simulations of the electrical activity of the heart. For this purpose, we created a simulation database using Aliev-Panfilov model. Our simulation database included 3880 maps formed by starting the simulations from endocardial, myocardial and epicardial sites. Half of these maps were used as training data and the rest were used as test data. We selected 64 points on left and 64 on right endocardial surfaces as multielectrode basket catheter measurement sites and 91 sites on epicardial surface as the intravenous catheter measurement sites. To test the performance of this approach we used criteria such as correlation coefficient (CC), root mean squared error (RMSE), relative error (RE) and localization error (LE). As a result, between the estimated and original maps CC is ∼0,98, RMSE is ∼2,7 ms, RE is ∼0,05 and LE is 5–6 mm.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"7 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":"126346652","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}

引用次数: 0

Classification in frequency domain of EEG Signals of Motor Imagery for Brain Computer Interfaces 基于脑机接口的运动图像脑电信号频域分类

2009 14th National Biomedical Engineering Meeting Pub Date : 2009-05-20 DOI: 10.1109/BIYOMUT.2009.5130258

U. Halici

引用次数: 1

To compare the different scaffolds according to porosity's properties 根据孔隙率的特性对不同支架进行比较

2009 14th National Biomedical Engineering Meeting Pub Date : 2009-05-20 DOI: 10.1109/BIYOMUT.2009.5130324

Berivan Çeçen, leyla didem kozaci, M. Yuksel, A. Pasinli, Ozge Oral, H. Havitcioglu

引用次数: 0

MR and X-Ray Angiography registration intensity based approach 基于MR和x线血管造影配准强度的方法

2009 14th National Biomedical Engineering Meeting Pub Date : 2009-05-20 DOI: 10.1109/BIYOMUT.2009.5130269

F. A. Durmaz, A. C. Yilmam, C. Ozturk

引用次数: 0

Analysis of catheter-based imaging devices for side-looking IVUS 侧视IVUS中导管成像装置的分析

2009 14th National Biomedical Engineering Meeting Pub Date : 2009-05-20 DOI: 10.1109/BIYOMUT.2009.5130312

A. Şişman, M. Karaman

引用次数: 1

Precision calibrator design and implementation for X-ray diagnostic devices x射线诊断设备精密校准器的设计与实现

2009 14th National Biomedical Engineering Meeting Pub Date : 2009-05-20 DOI: 10.1109/BIYOMUT.2009.5130263

Hakan Gemici, I. Karagoz, M. Ozden

{"title":"Precision calibrator design and implementation for X-ray diagnostic devices","authors":"Hakan Gemici, I. Karagoz, M. Ozden","doi":"10.1109/BIYOMUT.2009.5130263","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130263","url":null,"abstract":"In this study it is aimed to design and develop an instrumental device which is capable of measuring some key parameters of X-ray tubes employed in many medical imaging devices including conventional X-ray imaging, fluoroscopy, mammography and dental X-ray imaging and those measured parameters which is critical for both imaging quality and patient safety aspects are acquired and evaluated extremely precise and very reliable with the help of latest technological advancements. Furthermore the designed instrumental device is supplemented with a Bluetooth connection capability which allows both remote controlling of the device and data transmission between the device and PC. Also a graphical user interface which is capable of recording multiple exposure data acquired via Bluetooth module and plotting comparison graphs in demand of user is also programmed in .NET environment. Remote controlling of the device and data transmission via Bluetooth avoided possible risks of working close to high voltage transformer of X-ray tube, hence gives an extra protection to medical device technicians. Taken measurements can be used to make periodic calibrations of medical imaging devices and this also helps reducing possible risks may be caused by overdosing during imaging.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"36 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":"126756827","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}

引用次数: 0

Effects of depression on hippocampal memory: A computational model 抑郁症对海马记忆的影响:一个计算模型

2009 14th National Biomedical Engineering Meeting Pub Date : 2009-05-20 DOI: 10.1109/BIYOMUT.2009.5130384

Gokcen Yildiz

{"title":"Effects of depression on hippocampal memory: A computational model","authors":"Gokcen Yildiz","doi":"10.1109/BIYOMUT.2009.5130384","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130384","url":null,"abstract":"Animal studies have shown that chronic stress and depression produce irreversible atrophy of the apical dendrites of CA3 pyramidal neurons. Dysregulations caused by depression also disturbes molecular mechanisms of hippocampal long-term potentiation (LTP). The effect of stress on amygdala is just the opposite of the hippocampus; neuroimaging studies have found both increased baseline activity and a greater amygdala volume in depressed compared to nondepressed individuals. In our study, we have implemented a computational model of CA3 region of the hippocampus to simulate the auto-associative memory impairement caused by depression. In our model, the dendritic atrophy and disturbed synaptic plasticity, is represented by the increase in transmission delay and the increased amygdala activity, in turn, is represented by increased inhibitory input to CA3 region. Our auto-associative CA3 network incorporates 256 excitatory recurrent Hebb's synapses in a 16 × 16 array plus one interneuron representing the inhibition by amygdala. The network has been trained to recognize face patterns. We tested the auto-associative memory function with incomplete patterns and we expected our model to perform the pattern completion function. The pattern completion performance was negatively effected by the increase of the inhibition by amygdala. The increase in information delay due to dendritical atrophy had even more severe consequences on the memory performance. We observed a shutting off of the auto-associative memory for time delays longer than 10ms. In further studies, our dynamic model will be improved to include the molecular effects of stress on synaptic plasticity.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"4 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":"127916694","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}

引用次数: 0

The role of fibrin as a ligand for ICAM-1 and PMN in melanoma adhesion under different shear conditions. 纤维蛋白作为ICAM-1和PMN的配体在不同剪切条件下黑色素瘤粘附中的作用。

2009 14th National Biomedical Engineering Meeting Pub Date : 2009-05-20 DOI: 10.1109/BIYOMUT.2009.5130385

Tugba Ozdemir, C. Dong

引用次数: 0

J-substitution and equipotential-projection based hybrid MREIT reconstruction algorithm 基于j置换和等势投影的混合MREIT重建算法

2009 14th National Biomedical Engineering Meeting Pub Date : 2009-05-20 DOI: 10.1109/BIYOMUT.2009.5130291

R. Boyacioglu, B. M. Eyuboglu

引用次数: 4

Performing discrete fourier transform of the heart sounds on the pocket computer 在袖珍电脑上对心音进行离散傅立叶变换

2009 14th National Biomedical Engineering Meeting Pub Date : 2009-05-20 DOI: 10.1109/BIYOMUT.2009.5130280

G. E. Guraksin, U. Ergun, Omer Deperlioglu

{"title":"Performing discrete fourier transform of the heart sounds on the pocket computer","authors":"G. E. Guraksin, U. Ergun, Omer Deperlioglu","doi":"10.1109/BIYOMUT.2009.5130280","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130280","url":null,"abstract":"The heart is one of the two significant organs for human life. Today the most important method used by the medical doctors in diagnosing the disorders in connection with the heart is listening with the stethoscope. The sounds created by the flow of the blood entering the heart and movements of the valvular connected to the flow are listened and then the anormalities related to the heart are determined. On the other hand, the method of listening with the stethoscope has many constrains. In this study, from the heart sounds taken from the patient via electronic stethoscope digital data have been acquired, and with the discrete Fourier transform, which is one of the signal processing methods, frequency analysis has been performed, and both sound graphic and frequency spectrum have been displayed on the pocket computer. Thus, examining the frequency spectrum of the normal and anormal heart sounds, it is thought that the differences on the frequency axis of the normal and anormal sounds may be beneficial in diagnosing. Because unlike normal heart sounds, the diseased heart sounds taken from a patient who has any kind of heart disorder include higher frequency components. As the developed system can be operated in a mobile way, it is appropriate for the medical doctors to use it in clinical practically.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"43 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":"132151386","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}

引用次数: 6