发布求助
文献互助 智能选刊 最新文献

1993 IEEE Annual Northeast Bioengineering Conference最新文献

筛选
英文 中文
Registration of successive DSA images using a simple genetic algorithm with a stochastic performance function 采用随机性能函数的简单遗传算法对连续DSA图像进行配准
1993 IEEE Annual Northeast Bioengineering Conference Pub Date : 1993-03-18 DOI: 10.1109/NEBC.1993.404346
J. Jacq, C. Roux
{"title":"Registration of successive DSA images using a simple genetic algorithm with a stochastic performance function","authors":"J. Jacq, C. Roux","doi":"10.1109/NEBC.1993.404346","DOIUrl":"https://doi.org/10.1109/NEBC.1993.404346","url":null,"abstract":"The authors present a method aimed at automatic registration of successive images in a sequence of digital subtraction angiographies (DSA). It is based on the search for polynomial warping which minimizes a L/sub 1/ distance between the two images to be registered. The optimization procedure is carried out by a method based on a traditional genetic algorithm with a stochastic fitness function which operates only on randomly selected individuals. Application to the registration of successive DSA images has been made by considering a map of sites in the neighborhoods of contours. Good preliminary results have been obtained in a reasonable processing time on a sequential computer.<<ETX>>","PeriodicalId":159783,"journal":{"name":"1993 IEEE Annual Northeast Bioengineering Conference","volume":"449 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115858755","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: 3
Magnetic backprojection imaging for the assessment of the vascular lumen 磁反投影成像对血管腔的评估
1993 IEEE Annual Northeast Bioengineering Conference Pub Date : 1993-03-18 DOI: 10.1109/NEBC.1993.404424
H. Hong, M. Fox
{"title":"Magnetic backprojection imaging for the assessment of the vascular lumen","authors":"H. Hong, M. Fox","doi":"10.1109/NEBC.1993.404424","DOIUrl":"https://doi.org/10.1109/NEBC.1993.404424","url":null,"abstract":"The authors point out that blood vessels can operate as electric conductors when small amounts of current are injected. The currents generate magnetic fields which can be detected by Hall effect sensors. By the backprojection of detected magnetic field, the location of the blood stream was obtained with a maximum position error of about /spl plusmn/7.5% in the prototype system. Such magnetic backprojection imaging (MBI) could potentially be utilized to detect the development of atheromatous plaques on the interior lumen of vessels.<<ETX>>","PeriodicalId":159783,"journal":{"name":"1993 IEEE Annual Northeast Bioengineering Conference","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115134977","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: 1
Stimulatory effect of He-Ne laser on the ventral motorneurons in crayfish 氦氖激光对小龙虾腹侧运动神经元的刺激作用
1993 IEEE Annual Northeast Bioengineering Conference Pub Date : 1993-03-18 DOI: 10.1109/NEBC.1993.404388
M. Merris
{"title":"Stimulatory effect of He-Ne laser on the ventral motorneurons in crayfish","authors":"M. Merris","doi":"10.1109/NEBC.1993.404388","DOIUrl":"https://doi.org/10.1109/NEBC.1993.404388","url":null,"abstract":"This investigation described used continuous wave He-Ne laser energy (/spl lambda/ = 670 nm) in an attempt to stimulate the ventral nerve cord (VNC) of the crayfish. The VNC was used as a model system analogous to motorneurons of vertebrates. There were significant increases in spontaneous action potential, which normally occur in the VNC, following laser irradiation of 20+ s. The indications are that laser energy at this wavelength and 20+ s duration increases the sensitivity of the nerve cells. The energy required to elicit an electrical response was reduced from that of non-irradiated cells. All indications are that neural tissues have some light sensitivity and that proper wavelength and amplitude could elicit a motor action potential.<<ETX>>","PeriodicalId":159783,"journal":{"name":"1993 IEEE Annual Northeast Bioengineering Conference","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127067982","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: 1
Modeling of a compliant arterial stenosis and its effects on arterial pressure and flow dynamics: implications for chaos 柔顺性动脉狭窄的建模及其对动脉压力和血流动力学的影响:对混沌的影响
1993 IEEE Annual Northeast Bioengineering Conference Pub Date : 1993-03-18 DOI: 10.1109/NEBC.1993.404431
S. Field, G. Drzewiecki
{"title":"Modeling of a compliant arterial stenosis and its effects on arterial pressure and flow dynamics: implications for chaos","authors":"S. Field, G. Drzewiecki","doi":"10.1109/NEBC.1993.404431","DOIUrl":"https://doi.org/10.1109/NEBC.1993.404431","url":null,"abstract":"Two models for a compliant (deformable) arterial stenosis are discussed. These models take into account the pulsatile pressure and flow of the arterial system as well as some inherent nonlinear properties of this system and the stenosis. A mathematical model which was partly simulated on a computer was developed. The other model was an in vitro (physical) model involving a Starling resistor chamber as the stenosis. Initial tests were performed on both models. The results of these tests give some proof to the presences of chaos in the vicinity of a stenosis.<<ETX>>","PeriodicalId":159783,"journal":{"name":"1993 IEEE Annual Northeast Bioengineering Conference","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129541567","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: 2
Muscle mechanics and sensory feedback control 肌肉力学和感觉反馈控制
1993 IEEE Annual Northeast Bioengineering Conference Pub Date : 1993-03-18 DOI: 10.1109/NEBC.1993.404417
Jiping He
{"title":"Muscle mechanics and sensory feedback control","authors":"Jiping He","doi":"10.1109/NEBC.1993.404417","DOIUrl":"https://doi.org/10.1109/NEBC.1993.404417","url":null,"abstract":"It is shown that the intrinsic mechanical properties of muscles are important components for sensory feedback control. The results are obtained through a computer simulation of small perturbation responses of a three joints musculoskeletal control system using either a hypothetical muscle model having constant force-length and force-velocity relations or a muscle model having complex, nonlinear properties as known today. The optimal feedback control matrix is also generated for both cases. It is shown that while it is possible to obtain comparable closed-loop responses, the feedback gains for the simple linear muscle model are much larger than that for the complex nonlinear muscle model.<<ETX>>","PeriodicalId":159783,"journal":{"name":"1993 IEEE Annual Northeast Bioengineering Conference","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127487738","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: 2
Computer aided stress analysis of the femur with prosthetic hip stem utilizing computed tomography 利用计算机断层扫描技术对人工髋关节股骨进行计算机辅助应力分析
1993 IEEE Annual Northeast Bioengineering Conference Pub Date : 1993-03-18 DOI: 10.1109/NEBC.1993.404415
Wei-chun Chang, M. J. Lindén, S. Robbins, C. Mayott, P. Engler
{"title":"Computer aided stress analysis of the femur with prosthetic hip stem utilizing computed tomography","authors":"Wei-chun Chang, M. J. Lindén, S. Robbins, C. Mayott, P. Engler","doi":"10.1109/NEBC.1993.404415","DOIUrl":"https://doi.org/10.1109/NEBC.1993.404415","url":null,"abstract":"A computer aided analysis method utilizing computed tomography (CT) together with a finite element program to determine the stress patterns in a femur with a total hip prosthesis is discussed. The CT scan data file provide the geometry for the three-dimensional finite element model. The model of femur-prosthesis is automatically generated from the CT data file by a preprocessing procedure which includes an edge detection algorithm to determine the boundaries of the reconstructed cross sectional images of the scanned bone. Formatted input data for ANSYS finite element program is generated by the preprocessor to calculate the stresses and displacements at the nodes and elements of the model. A practical method to transfer the CT data to the CAD/CAM system creating a three-dimensional bone geometry is developed. The edge data generated by the preprocessor are also introduced into a solid modeling package to produce a three-dimensional plastic solid model.<<ETX>>","PeriodicalId":159783,"journal":{"name":"1993 IEEE Annual Northeast Bioengineering Conference","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126155578","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: 5
Mean velocities and Reynolds stress measurements around the valves in the Penn State LVAD 宾夕法尼亚州立大学左心室辅助装置阀门周围的平均速度和雷诺应力测量值
1993 IEEE Annual Northeast Bioengineering Conference Pub Date : 1993-03-18 DOI: 10.1109/NEBC.1993.404379
J. Maymir, S. Deutsch, D. Geselowitz, J. Tarbell
{"title":"Mean velocities and Reynolds stress measurements around the valves in the Penn State LVAD","authors":"J. Maymir, S. Deutsch, D. Geselowitz, J. Tarbell","doi":"10.1109/NEBC.1993.404379","DOIUrl":"https://doi.org/10.1109/NEBC.1993.404379","url":null,"abstract":"A laser Doppler anemometer (LDA) was used to measure two components of velocity at eight locations around the Bjork-Shiley monostrut artificial valves in a plexiglass model of the Penn State 70 cc electric left ventricular assist device (LVAD). The model was filled with a blood analog fluid which matched the kinematic viscosity of blood. The model was connected to a mock circulatory loop in order to generate physiologic conditions. Two hundred and fifty velocity realizations were obtained during six time windows in the regurgitant phase of the flow cycle. These data were then processed, and the mean velocities and Reynolds turbulent stresses were calculated. The results reveal that a significant regurgitant jet occurs in the minor orifice of both the mitral and aortic valves. The strength of the jet is large enough for hemolysis and blood damage to occur.<<ETX>>","PeriodicalId":159783,"journal":{"name":"1993 IEEE Annual Northeast Bioengineering Conference","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122039203","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
Feature extraction for non-rigid motion analysis using continuity splines 基于连续样条的非刚体运动分析特征提取
1993 IEEE Annual Northeast Bioengineering Conference Pub Date : 1993-03-18 DOI: 10.1109/NEBC.1993.404420
S. H. Gwydir, H. Buettner, S. Dunn
{"title":"Feature extraction for non-rigid motion analysis using continuity splines","authors":"S. H. Gwydir, H. Buettner, S. Dunn","doi":"10.1109/NEBC.1993.404420","DOIUrl":"https://doi.org/10.1109/NEBC.1993.404420","url":null,"abstract":"Quantitative analysis of neurite outgrowth and growth cone motility provides key information for the development of new therapeutic strategies for treating peripheral nerve injury. The goal of this research is to track the motion of the growth cone through sequential time frames and to provide quantitative analysis of specific neurite modalities. The motion of the growth cone can be characterized as nonrigid, since the contour of the growth cone is constantly deforming. The problem of tracking the motion of nonrigid objects is addressed, and energy-minimizing active contour methods are used to track the motion of the growth cone.<<ETX>>","PeriodicalId":159783,"journal":{"name":"1993 IEEE Annual Northeast Bioengineering Conference","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128284588","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: 1
Automated aerosol testing 自动气溶胶测试
1993 IEEE Annual Northeast Bioengineering Conference Pub Date : 1993-03-18 DOI: 10.1109/NEBC.1993.404350
R. Romulus, D. Goldman, F. Chen, S. Reisman, A. Malick
{"title":"Automated aerosol testing","authors":"R. Romulus, D. Goldman, F. Chen, S. Reisman, A. Malick","doi":"10.1109/NEBC.1993.404350","DOIUrl":"https://doi.org/10.1109/NEBC.1993.404350","url":null,"abstract":"Aerosol cans have evolved into a more reliable and effective product, but they must meet the requirements of the Food and Drug Administration. The Research and Development Laboratory at Hoffman-La Roche conducts the necessary tests on these drugs. The shot weight test and the dose uniformity test are some of the many tests performed on these products, but the tests are very tedious and repetitive. An automated system is described that will simplify the tests. The different stations of the automated system were tested and the results were found to be satisfactory.<<ETX>>","PeriodicalId":159783,"journal":{"name":"1993 IEEE Annual Northeast Bioengineering Conference","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127822452","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
A finite difference model of electric field propagation in the human head: Implementation and validation 电场在人头部传播的有限差分模型:实现与验证
1993 IEEE Annual Northeast Bioengineering Conference Pub Date : 1993-03-18 DOI: 10.1109/NEBC.1993.404406
F. Marino, E. Halgren, J. Badier, M. Gee, V. Nenov
{"title":"A finite difference model of electric field propagation in the human head: Implementation and validation","authors":"F. Marino, E. Halgren, J. Badier, M. Gee, V. Nenov","doi":"10.1109/NEBC.1993.404406","DOIUrl":"https://doi.org/10.1109/NEBC.1993.404406","url":null,"abstract":"It is shown that a realistic finite-difference computational model for the propagation of electrical fields within the human head can be effectively implemented on a massively parallel computer. Potentially, the model will have not only anatomical accuracy, but also will be applicable to individual subjects automatically using their MRIs and/or CTs. This model has two further advantages. First, it yields the electric field distribution for all points within the head, not only at the scalp. Second, it allows the calculation of electric fields resulting from complex generator configurations without additional processing time, simply by placing additional sources and sinks at locations determined by the individual's MRI. Analytical methods can also model generators as dipole layers with complex geometries as the sum of many individual dipoles. However, the calculation increases proportionally with the number of modelled dipoles, and the placement of dipoles is problematic because the brain is not spherical. The model requires further development before it can be usefully applied to understanding the generation of human EEG.<<ETX>>","PeriodicalId":159783,"journal":{"name":"1993 IEEE Annual Northeast Bioengineering Conference","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128264825","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: 12
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：604180095
Book学术官方微信