Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286)最新文献_第2页

Improved EMG pattern recognition using the distribution plot of cepstrum 利用倒谱分布图改进的肌电模式识别

Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286) Pub Date : 1998-12-01 DOI: 10.1109/IEMBS.1998.744996

Chih-lung Lin, W. Kang, C. Hu, S. Young, J. Lai, Maw-huei Lee, T. Kuo

引用次数: 5

Detection sensitivity enhancements for fluorescence imaging with multi-photon excitation microscopy 用多光子激发显微镜增强荧光成像的检测灵敏度

Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286) Pub Date : 1998-12-01 DOI: 10.1109/IEMBS.1998.746913

D. Wokosin, W. Amos, J. G. White

{"title":"Detection sensitivity enhancements for fluorescence imaging with multi-photon excitation microscopy","authors":"D. Wokosin, W. Amos, J. G. White","doi":"10.1109/IEMBS.1998.746913","DOIUrl":"https://doi.org/10.1109/IEMBS.1998.746913","url":null,"abstract":"Multiphoton excitation microscopy (MPEM) offers several distinct advantages over laser scanning confocal microscopy (LSCM). One is that the resolution and the thickness of the optical section are determined by the excitation beam; a confocal detection aperture is therefore unnecessary. This feature allows the photodetector to be relocated from its usual location in the descanned emission beam within a confocal scan head so as to directly intercept the emitted fluorescent signal emerging from the microscope. The enhancement in signal gained by changing from internal to whole area (external) detection in this way has been evaluated quantitatively. In particular, longitudinal chromatic aberration has been shown to reduce the efficiency of internal detection relative to external. Also, a novel optical design is described, which allows increased collection efficiency with MPEM by capturing light emitted away from the objective lens. Together, these two enhancements typically provide an improvement in efficiency of at least 4.5 times, and even greater inside thick and scattering specimens. Such improvements are crucial for extending the longevity of living preparations by minimizing phototoxic exposure during observation. They also enable deeper imaging inside specimens where signal loss by scattering has previously limited the obtainable sectioning depth.","PeriodicalId":156581,"journal":{"name":"Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286)","volume":"299 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127563532","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: 10

Magnetoencephalography and functional MRI: a quantitative study of speech perception 脑磁图和功能性磁共振成像:语音感知的定量研究

Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286) Pub Date : 1998-12-01 DOI: 10.1109/IEMBS.1998.747027

T. Roberts, D. Poeppel, H. Rowley

{"title":"Magnetoencephalography and functional MRI: a quantitative study of speech perception","authors":"T. Roberts, D. Poeppel, H. Rowley","doi":"10.1109/IEMBS.1998.747027","DOIUrl":"https://doi.org/10.1109/IEMBS.1998.747027","url":null,"abstract":"Magnetoencephalography (MEG), sensitive to evoked neuronal activity, and functional magnetic resonance imaging (fMRI), sensitive to hemodynamic consequences of cortical activation, were compared in normal subjects, presented with simple speech elements (vowels). The subjects were instructed either to listen passively or to perform phonetic or pitch discrimination tasks. Sources of activation detected using the two technologies were found to co-localize in the superior temporal gyrus. Furthermore quantification of the evoked responses, using both techniques, revealed a task-induced bilateral increase in activation, with the greatest increases observed in the left hemisphere, during performance of the phonetic discrimination task. It is concluded that not only do fMRI and MEG indicate similar underlying cortical activation areas, but that they offer quantitative indices of hemispheric lateralization induced by performance of a linguistic task. Their co-variance with respect to hemisphere and task performance suggests that despite their different neurophysiological sensitivities (hemodynamic changes vs. neuronal electrical activity), both techniques offer quantitative approaches to the study of speech perception, and by extension, to the processing of language.","PeriodicalId":156581,"journal":{"name":"Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286)","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133627956","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

Visualizing spatially distributed hemodynamic lag times in event-related functional MRI: estimation of a characteristic visual "impulse response" 在事件相关功能MRI中可视化空间分布的血流动力学滞后时间:特征性视觉“脉冲响应”的估计

Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286) Pub Date : 1998-12-01 DOI: 10.1109/IEMBS.1998.747028

V. Calhoun, T. Adalı, M. Kraut, P. Rivkin, G. Pearlson

{"title":"Visualizing spatially distributed hemodynamic lag times in event-related functional MRI: estimation of a characteristic visual \"impulse response\"","authors":"V. Calhoun, T. Adalı, M. Kraut, P. Rivkin, G. Pearlson","doi":"10.1109/IEMBS.1998.747028","DOIUrl":"https://doi.org/10.1109/IEMBS.1998.747028","url":null,"abstract":"Functional MRI is a technique capable of providing spatial and temporal information about the brain's hemodynamics. It has been observed that the onset of observed signal changes can vary across regions exhibiting activation. The authors have developed a method for extracting information about these timing differences and for observing the temporal-spatial distribution of the blood response by, characterizing a typical hemodynamic response (HR) to a single flash of light repeated at 30 s intervals. They anatomically locate voxels in the primary visual cortex, a region located along the calcarine sulcus, which is the main terminus of the geniculocortical visual pathways. This average response profile is correlated with the data, producing a map of \"active\" voxels. Next, the authors explore the distribution of lags by shifting the HR, correlating this signal with the data, and producing another map. They observed increased activation in non-primary visual cortex as the lag was increased to 2-3 s. These results can be most effectively displayed in a time lapse movie. The described technique provides a way of determining varying hemodynamic lag times and partitioning \"activated\" regions in time. It also clearly demonstrates that these time lags do differ spatially.","PeriodicalId":156581,"journal":{"name":"Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129989446","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

Cortical source modeling and imaging 皮质源建模和成像

Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286) Pub Date : 1998-12-01 DOI: 10.1109/IEMBS.1998.746907

Bin He

引用次数: 0

Temperature measurements by thermal radiation during ArF excimer laser ablation with gelatin gel 明胶凝胶ArF准分子激光烧蚀过程中的热辐射温度测量

Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286) Pub Date : 1998-12-01 DOI: 10.1109/IEMBS.1998.746960

M. Ishihara, T. Arai, M. Kikuchi, H. Nakano, M. Obara

引用次数: 0

Automatic body temperature control system for small animal studies using dual mode PI control 体温自动控制系统用于小动物研究，采用双模式PI控制

Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286) Pub Date : 1998-12-01 DOI: 10.1109/IEMBS.1998.746987

Hyung Il Kim, Hee Chan Kim, Byoung Woo Yoon

引用次数: 1

3-D spatial sensitivity profiles of head model in near-infrared spectroscopy 近红外光谱下头部模型三维空间灵敏度分布

Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286) Pub Date : 1998-12-01 DOI: 10.1109/IEMBS.1998.746958

E. Okada

引用次数: 0

A guided acoustic wave method for characterization of medical ultrasound transducers 医用超声换能器的导声波表征方法

Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286) Pub Date : 1998-12-01 DOI: 10.1109/IEMBS.1998.746943

Rui Zhang, M. Wan, W. Cao

引用次数: 1

Inductively coupled wideband transceiver for bioimpedance spectroscopy (IBIS) 生物阻抗谱(IBIS)用电感耦合宽带收发器

Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286) Pub Date : 1998-12-01 DOI: 10.1109/IEMBS.1998.746936

H. Hutten, H. Scharfetter, W. Ninaus, Bernhard Puswald, G. I. Petrova, D. Kovachev

{"title":"Inductively coupled wideband transceiver for bioimpedance spectroscopy (IBIS)","authors":"H. Hutten, H. Scharfetter, W. Ninaus, Bernhard Puswald, G. I. Petrova, D. Kovachev","doi":"10.1109/IEMBS.1998.746936","DOIUrl":"https://doi.org/10.1109/IEMBS.1998.746936","url":null,"abstract":"Most measurement devices for bioimpedance spectroscopy are coupled to the measured object (tissue) via electrodes. At frequencies >500 kHz they suffer from artifacts due to stray capacitances between electrode leads as well as between ground and object. The non-invasive measurement of the brain conductivity is hardly possible with surface electrodes. These disadvantages can be obviated by inductive coupling. The aim of this work was the development of a wideband transceiver. In order to define its specifications a feasibility study has been carried out with a simulation model for two different coil systems above a homogeneous conducting plate. According to simulation results both systems render possible to resolve conductivity changes down to 10/sup -3/(/spl Omega/m)/sup -1/ at 50 kHz. The sensitivity increases with the square of the frequency. The receiver electronics must then resolve voltages >=1 /spl mu/V at an excitation current of 1 A. We have realized a transceiver which matches these specifications with a S/N-ratio of 22 dB at 1 /spl mu/V. The frequency range is 50 kHz-5 MHz.","PeriodicalId":156581,"journal":{"name":"Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124401199","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: 18