检索结果-内蒙古大学图书馆

biomedical Topical Meeting, BIOMED 2002

作者： Bluestone, A.Y. Abdoulaev, G.S. Lasker, J.M. Stewart, M. Hielscher, A.H. Depts. of Biomedical Engineering and Radiology Columbia University 530 West 120th Street MC 8904 New YorkNY11203 United States Dept. of Pathology and Program in Neural and Behavioral Science State University of New York - Downstate Medical Center 450 Clarkson Avenue BrooklynNY11203 United States

ISBN: (纸本)1557527024

We have developed a brain imaging system that uses continuous back-reflected light intensities to obtain spatially resolved, volumetric maps of oxy- and deoxy-hemoglobin in small animals. We report on numerical results as well as experimental studies performed on rats. The numerical study verified the ability to spatially localize changes in the optical properties. The preliminary experimental results focused on visualizing the three-dimensional hemodynamic changes in a rat brain in response to perturbations in the inspired CO2 concentration. © 2002 Optical Society of America.

关键词： Animals

来源：评论

学校读者我要写书评

暂无评论

A combined experimental and computational analysis of membrane potential variations in excitable cells in response to DC electric fields

A combined experimental and computational analysis of membra...

引用

2002 IEEE Conference on Electrical Insulation and Dielectric Phenomena

作者： Hassan, Noha Chatterjee, Indira Publicover, Nelson G. Craviso, Gale L. Department of Biomedical Engineering Graduate Program University of Nevada Reno NV 89557 United States Departments of Electrical Eng. MS 260 University of Nevada Reno NV 89557 United States Dept. of Physiol. and Cell Biology Reno NV 89557 United States Department of Pharmacology Reno NV 89557 United States

Two approaches were used to gain an understanding of the spatial variations in membrane potential resulting from exposure of cultured adrenal medullary chromaffin cells to a 20 V/cm DC electric field of different orientations. The finite element method was used to solve Poisson's equation for the potential in a Petri dish containing isolated spherical chromaffin cells or chromaffin cell aggregates of various configurations and the results of the computations were compared to the results obtained experimentally. The latter used fluorescence imaging of chromaffin cell membranes stained with the fluorescent voltage-sensitive dye di-8-ANEPPS to monitor variations in membrane potential. For single cells, the numerical results for membrane potential variation were in good agreement with the experimental results. For realistic chains of two or three cells, the results from both methods were in agreement only when the long axis of the chain was perpendicular to the electric field. For three cells forming a realistic, irregularly shaped aggregate, variations in membrane potential determined experimentally were more complex than those predicted by the numerical computations for regions of cell contact. The results provide a foundation for understanding how excitable cells respond to DC electric fields and identify parameters that influence these responses.

关键词： Electric potential

来源：评论

学校读者我要写书评

暂无评论

Polarization-gated imaging techniques based on time-resolved stokes vectors for filament tissues

Polarization-gated imaging techniques based on time-resolved...

引用

Conference on Lasers and Electro-Optics (CLEO 2002)

作者： Sun, Chia-Wei Yang, C.C. Kiang, Yean-Woei Lu, Long-Sheng Lin, Chii-Wann Wang, Xueding Wang, Lihong V. Dept. of Electrical Engineering Grad. Inst. of Electro-Optical Eng. National Taiwan University 1 Roosevelt Road Sec. 4 Taipei Taiwan Department of Pharmacology Graduate Institute of Bioengineering National Taiwan University 1 Roosevelt Road Sec. 4 Taipei Taiwan Biomedical Engineering Program Optical Imaging Laboratory Texas A and M University College Station TX United States

ISBN: (纸本)1557527067

Polarization-gated imaging techniques based on time-resolved Stokes vectors for filament tissues were discussed. The time-resolved Stokes vectors of signals transmitting chicken breast tissue, mouse cardiac muscle tissue, and polystyrene micro-sphere solution were compared. Results showed that with 45 degrees linear polarization and circular polarization output monitoring, better quality images will be obtained.

关键词： Medical imaging

来源：评论

学校读者我要写书评

暂无评论

Radial MRI techniques for obtaining motion-insensitive high-resolution images with variable contrast

Radial MRI techniques for obtaining motion-insensitive high-...

引用

IEEE International Symposium on biomedical Imaging

作者： M.I. Altbach T.P. Trouard A.F. Gmitro Department of Radiologv University of Arizona Tucson Tucson AZ USA Biomedical Engineering Program University of Arizona Tucson Tucson AZ USA University of Arizona Tucson AZ US Dept. of Radiol. Arizona Univ. Tucson AZ USA

ISBN: (纸本)078037584X

The advantages of multi-shot radial fast spin-echo (RAD-FSE) MRI methods over conventional Fourier transformed (FT) MRI methods for obtaining high-resolution images with minimal motion- and flow-induced artifact are presented. The utility of post-processing methods used to obtain images with different T2-weighted contrast as well as T2 maps from a single radial set is also described. Applications are shown for three areas of clinical relevance, where motion precludes the use of conventional FT MRI methods to obtain high-resolution images. Results are shown for Diffusion-Weighted Imaging (DWI), and are compared to standard single-shot echo planar imaging (SSEPI). Results from cardiac imaging are presented and compared to conventional 2DFT-FSE methods. Results from RAD-FSE in abdominal imaging are also compared to single-shot fast spin-echo (SSFSE) and conventional 2DFT-FSE methods. The advantages of generating multiple T2-weighted images as well as T2 maps from a single radial set are demonstrated for body imaging.

关键词： Magnetic resonance imaging High-resolution imaging Image generation Spatial resolution Image resolution Magnetic susceptibility Tellurium Lipidomics biomedical engineering Abdomen

来源：评论

学校读者我要写书评

暂无评论

Preparing biomedical engineers for real-world problem-solving

Preparing biomedical engineers for real-world problem-solvin...

引用

2001 ASEE Annual Conference and Exposition: Peppers, Papers, Pueblos and Professors

作者： Ropella, Kristina M. Kelso, David M. Enderle, John D. Dept. Biomedical Engineering Marquette University Dept. Biomedical Engineering Northwestern University Biomedical Engineering Program Dept. of Electrical Engineering University of Connecticut Northwestern University

The preparation of biomedical engineers for real-world problem-solving id discussed. Failure to incorporate such real-world experiences throughout the curriculum creates frustration for the student, particularly for the freshman or sophomore undergraduate who lacks the experience to draw a connection between theory and practice. The biomedical engineer is confronted with real-world problems and design that require a team of experts, project planning and execution, regulatory and quality control. If biomedicl engineering programs are to prepare students to solve biomedical problems that impact a wide range of economic, environmental, ethical, legal and social issues, students must be taught how to put theory into practice.

关键词： engineering education

来源：评论

学校读者我要写书评

暂无评论

Direct classification with indirect data

Direct classification with indirect data

引用

14th Annual Neural Information Processing Systems Conference, NIPS 2000

作者： Brown, Timothy X. Interdisciplinary Telecommunications Program Dept. of Electrical and Computer Engineering University of Colorado Boulder 80309-0530 United States

We classify an input space according to the outputs of a real-valued function. The function is not given, but rather examples of the function. We contribute a consistent classifier that avoids the unnecessary complexi...

ISBN: (纸本)0262122413

关键词：

来源：评论

学校读者我要写书评

暂无评论

Abstract

引用

Canadian Journal of Anesthesia 2003年第1期50卷 A69-A183页

作者： Nivez F. Rasic Robert M. Friesen Bruce Anderson Shirley A. Hoban Nancy Olson Jacob Kress Simon Lévesque Martin R. Lessard Pierre Nicole Stéphan Langevin Jacques Langevin François LeBlanc Jacques Brochu Alexis Turgeon Pierre C. Nicole Claude A. Trépanier Sylvie Marcoux Vynka C. Lash Keith Anderson J. Francisco Asenjo Francesco Carli Dale A. Engen Gordon H. Morewood Nancy Ghazar Ted Ashbury Elizabeth G. VanDenKerkhof Louie Wang Katherine R. Blight C. David Mazer Gregory M. T. Hare Zhilan Wang Carla Coackley Rong Qu Malcolm Robb Duncan J. Stewart Thomas Schricker Sarkis Meterissian Ralph Lattermann Franco Carli Jean-Yves Dupuis Feng Wang Howard Nathan Kathryn Williams James A. Robblee Howard J. Nathan Raynauld Ko Marelise Kruger Karen McRae Gail Darling Thomas Waddell David Morrice Desmond McGlade Ken Cheung Joel Katz Peter Slinger Andrew J. Baker Kathryn M. Hum Steve Y. Kim Aiala Barr Zeev Friedman David T. Wong Frances Chung David H. Goldstein William C. Blaine Michael J. Rimmer Jacelyn M. Kolman Orlando R. Hung Ian G. Beauprie Robert Vandorpe Chandran J. Baker William Rennie Robert Brown Susan Kenny Damon Kamming Brid McGrath Bruna Curti Shirley King Brenda W. Lau Craig R. Ries Josie Schmid Richard N. Kraima Toshimi Arai Masao Yamashita William Splinter Uma R. Parekh Teresa Valois-Gomez John G. Muir Andrew G. Usher Ramona A. Kearney Ban C. H. Tsui D. Shende V. Darlong N. Asit Justin Richards John Van Aerde Alese Wagner Dominic Cave Ramona Kearney Leeanne Philips Kathy Reid Khalid Chowdary Peter Brooks Ron Ree Mark Ansermino David Rosen Pirjo H. Manninen Ghazali Ghazaime Soad Louissi Bisi Odukoya Rosendo A. Rodriguez Luciana Parlea Fraser D. Rubens Paul Hendry Il-Ok Lee In Ho Lee Paul Audu Peter H. K. Mak Pirijo H. Manninen Shanti Sundar Stephan K. W. Schwarz Ernest Puil Steven E. Hybarger Tod B. Sloan Richard Brull Colin J. L. McCartney Regan Rawson Sherif Abbas Vincent W. S. Chan D. Ong D. Ha H. Ha W. P. S. McKay Myung-Hoon Kong Mi-Kyung Lee Sang-Ho Lim Young-Seok Choi Nan-Sook Kim P. H. Lennox H. S. Umedaly C. Department of Anesthesia St. Boniface General Hospital Winnipeg Department of Anesthesia (critical care division) Laval University and CHA Hopital Enfant-Jésus Quebec City Departments of Anesthesiology and Social and Preventive Medicine Laval University and CHA Hôpital de l’Enfant-Jésus Quebec City Department of Anesthesia Montreal General Hospital Site McGill University Health Centre Montreal Department of Anesthesiology Queen’s University Kingston Department of Anesthesia and Division of Cardiology University of Toronto St. Michael’s Hospital Toronto Department of Anesthesia McGill University Royal Victoria Hospital Montreal Canada Epidemiology Unit H University of Ottawa Heart Institute Ottawa Cardiac Division of Anesthesia University of Ottawa Heart Institute Ottawa University of Ottawa Heart Institute Ottawa Department of Anesthesia and Pain Management Toronto General Hospital University Health Network University of Toronto Toronto Department of Surgery Division of Thoracic Surgery Toronto General Hospital University of Toronto Toronto Department of Anaesthesia University of Toronto St. Michael?s Hospital Toronto Department of Anesthesia Toronto Western Hospital University Health Network and Faculty of Nursing University of Toronto Toronto Dept of Anesthesiology Queen’s University Kingston Depts. of Anesthesia and Radiology QEII Health Science Centre Halifax Department of Anesthesia and Department of Surgery Health Sciences Center Winnipeg Department of Anesthesia University of Toronto Toronto Western Hospital Toronto Department of Anesthesia The University of British Columbia Vancouver Department of Anesthesia Prince George Regional Hospital Prince George Department of Anesthesiology Ibaraki Children’s Hospital Ibaraki Japan Department of Anesthesiology Children’s Hospital of Eastern Ontario Ottawa Department of Paediatric Anaesthesia IWK Health Centre Halifax Department of Anesthesiology and Pain Medicine University of Alberta Hospital Edmonton

来源：评论

学校读者我要写书评

暂无评论

Low temperature fluorescence imaging of freeze-trapped human cervical tissues

Low temperature fluorescence imaging of freeze-trapped human...

引用

作者： Ramanujam, Nirmala Richards-Kortum, Rebecca Thomsen, Sharon Mahadevan-Jansen, Anita Follen, Michele Chance, Britton Department of Biomedical Engineering University of Wisconsin Madison WI United States Biomedical Engineering Program University of Texas Austin TX United States Dept. Biomedical Engineering Vanderbilt University Nashville TN United States Dept. Gynecologic Oncology University of Texas MD Anderson Cancer Center Houston TX United States Dept. Biochemistry University of Pennsylvania Philadelphia PA United States

We characterized the fluorescence intensity distribution within the epithelia and stroma of frozen human cervical tissues at the following excitation-emission wavelength pairs: 440, 525 nm and 365, 460 nm. The intensities at both excitation-emission wavelength pairs are significantly lower in the epithelia of severely dysplastic tissues, relative to that in normal and inflammatory tissues. Furthermore, there are small differences in (1) the epithelial intensity of severe dysplasia and mild dysplasia at 440, 525 nm and (2) the stromal intensity of inflammatory and severely dysplastic tissues at 365, 460 nm. A comparison of the ratio of intensities at 440, 525 nm and 365, 460 nm between the epithelia of each tissue type indicates that this ratio is lowest in severely dysplastic tissues. It is interesting to note that the epithelial and stromal intensities are comparable at 365, 460 nm;however, at 440, 525 nm, the epithelial intensity is more than a factor of two less that that of the stroma for all tissue types. © 2001 Optical Society of America.

关键词： Fluorescence

来源：评论

学校读者我要写书评

暂无评论

A model of the internal control system within the superior colliculus

A model of the internal control system within the superior c...

引用

作者： Short, S.J. Enderle, J.D. Biomedical Engineering Program Dept. of Elec. and Systems Eng. University of Connecticut Storrs CT 06268 United States

This paper describes a mathematical model devised to help explain experimental observations involving the role of the superior colliculus in the generation of saccades. Specifically, the superior colliculus has long been known to be involved in production of the error signal that determines the location to which the eyes are moved. The superior colliculus is normally modeled only in terms of its final output, neglecting the processes that must occur within the superior colliculus in order to create that signal. This model includes treatment of the lateral inhibition system and the sequence of activity in populations of neurons in the superficial, intermediate, and deeper layers of the superior colliculus, Influence from the cerebellum and nuclei of the mesencephalon are included in the model to demonstrate the effect of external influences on the operation of the superior colliculus. The model demonstrates one possible function of the moving hill hypothesis as an intracollicular control system for the generation of saccades. The purpose of the development of this model is to stimulate discussion on the more precise performance of the superior colliculus in the saccadic eye movement system.

关键词： Eye movements

来源：评论

学校读者我要写书评

暂无评论

Understanding stress concentration around a nutrient foramen

Understanding stress concentration around a nutrient foramen

引用

Proceedings of the 2001 Bioengineering Conference

作者： Rapoff, Andrew J. Götzen, Nils Cross, Alan R. Ifju, Peter G. University of Florida Department of Aerospace Engineering Gainesville FL United States University of Florida Biomedical Engineering Program Gainesville FL United States University of Florida Dept. of Small Anim. Clin. Sciences Gainesville FL United States

The effects of stress concentration around a nutrient foramen were discussed. The finite element analysis (FEA) showed that a strong decrease in the stress concentration had a direct effect on the foramen edge. Less mineral density and higher porosity were found near the foramen. The results showed good agreement between the measured and predicted strains along a mediolateral line.

关键词： Bone

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：