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1993 IEEE Annual Northeast Bioengineering Conference最新文献

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Model of a conductimetric urea sensor 电导式尿素传感器模型
1993 IEEE Annual Northeast Bioengineering Conference Pub Date : 1993-03-18 DOI: 10.1109/NEBC.1993.404359
N. F. Sheppard, D. J. Mears
{"title":"Model of a conductimetric urea sensor","authors":"N. F. Sheppard, D. J. Mears","doi":"10.1109/NEBC.1993.404359","DOIUrl":"https://doi.org/10.1109/NEBC.1993.404359","url":null,"abstract":"A model for predicting the response of a conductimetric urea sensor was developed. The sensor under consideration is formed by immobilizing the enzyme urease onto the surface of a planar interdigitated electrode array. The analysis combines a mass transport model with an electromagnetic fields model for calculating interelectrode impedance. The transport model was used to determine the evolution of charged reaction products in time and space. Interelectrode impedance was calculated from the resulting ionic conductivity profiles using the fields model. The calibration curve resulting from the model predictions was in good agreement with experimental data, using a single adjustable parameter.<<ETX>>","PeriodicalId":159783,"journal":{"name":"1993 IEEE Annual Northeast Bioengineering Conference","volume":"35 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":"115581933","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
Further study of a stopping rule for the EM algorithm 进一步研究了EM算法的停止规则
1993 IEEE Annual Northeast Bioengineering Conference Pub Date : 1993-03-18 DOI: 10.1109/NEBC.1993.404419
G. Kontaxakis, G. Tzanakos
{"title":"Further study of a stopping rule for the EM algorithm","authors":"G. Kontaxakis, G. Tzanakos","doi":"10.1109/NEBC.1993.404419","DOIUrl":"https://doi.org/10.1109/NEBC.1993.404419","url":null,"abstract":"A simulation study of the EM algorithm for image reconstruction in PET is discussed. Recently a method to stop the iterations before the image quality starts to deteriorate has been proposed by G. Kontaxakis and G. Tzanakos (IEEE Nucl. Sci. Symp., 1992). Here, a further study of the method is presented in an effort to apply the stopping rule to individual elements or groups of elements of the image vector.<<ETX>>","PeriodicalId":159783,"journal":{"name":"1993 IEEE Annual Northeast Bioengineering Conference","volume":"45 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":"124275435","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
Techniques for multimodality image registration 多模态图像配准技术
1993 IEEE Annual Northeast Bioengineering Conference Pub Date : 1993-03-18 DOI: 10.1109/NEBC.1993.404347
J. Chapnick, M. Noz, Gerald Q. Maguire, E. Kramer, J. Sanger, B. Birnbaum, A. Megibow
{"title":"Techniques for multimodality image registration","authors":"J. Chapnick, M. Noz, Gerald Q. Maguire, E. Kramer, J. Sanger, B. Birnbaum, A. Megibow","doi":"10.1109/NEBC.1993.404347","DOIUrl":"https://doi.org/10.1109/NEBC.1993.404347","url":null,"abstract":"The authors describe the development of techniques used for cross-modality correlation of medical images. To accomplish this goal, software routines were developed which automate and standardize the comparison of images within and between three-dimensional tomographic imaging modalities. Data from phantoms and clinical studies reflect the success of this technique.<<ETX>>","PeriodicalId":159783,"journal":{"name":"1993 IEEE Annual Northeast Bioengineering Conference","volume":"33 5 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":"124344612","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: 17
3-D vessel tracking and quantitation in angio MRI 血管MRI三维血管跟踪与定量
1993 IEEE Annual Northeast Bioengineering Conference Pub Date : 1993-03-18 DOI: 10.1109/NEBC.1993.404423
P. Reuze, J. Coatrieux, L. Luo, J. Dillenseger
{"title":"3-D vessel tracking and quantitation in angio MRI","authors":"P. Reuze, J. Coatrieux, L. Luo, J. Dillenseger","doi":"10.1109/NEBC.1993.404423","DOIUrl":"https://doi.org/10.1109/NEBC.1993.404423","url":null,"abstract":"A method for the three-dimensional (3-D) tracking and the quantitation of blood vessels from magnetic resonance imaging (MRI) is discussed. The approach is based on the 3-D geometrical moments and consists of the following steps: (1) interactive selection of 3-D seed points, (2) automatic tracking of the vessels, (3) local computation of both diameter and orientation, and (4) rendering of the vessel approximation model. The results on simulated and real data depict a good behavior of the detection and estimation scheme.<<ETX>>","PeriodicalId":159783,"journal":{"name":"1993 IEEE Annual Northeast Bioengineering Conference","volume":"44 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":"123736122","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
A class of rational systems for modelling 1/f power spectra [of biological signals] 一类模拟[生物信号]1/f功率谱的有理系统
1993 IEEE Annual Northeast Bioengineering Conference Pub Date : 1993-03-18 DOI: 10.1109/NEBC.1993.404386
G. Maskarinec, B. Onaral
{"title":"A class of rational systems for modelling 1/f power spectra [of biological signals]","authors":"G. Maskarinec, B. Onaral","doi":"10.1109/NEBC.1993.404386","DOIUrl":"https://doi.org/10.1109/NEBC.1993.404386","url":null,"abstract":"A class of rational systems for modelling the power spectra of 1/f signals are introduced. This class is characterized by the cascade of frequency scaled versions of an arbitrary prototype rational function which has the same number of zeros and poles. The novelty of the approach lies in the fact that the scale-invariant nature of the power-law response is intentionally imposed on the rational system via the frequency scaling operation, resulting in /spl gamma/-homogeneous rational functions. For finite bandwidth systems, as the number of elements in the cascade increases, the deviations from exact 1/f behavior decrease so that arbitrarily good approximations to an exact power-law behavior can be achieved. The rational models previously derived using other approaches can be shown to be special cases of the class of rational models introduced here. While these results have been presented in the context of the rational modelling of 1/f power spectra, the solution can be used to achieve a power-law magnitude response where the scaling exponent /spl lambda/ satisfies -/spl infin/ < /spl lambda/ < /spl infin/.<<ETX>>","PeriodicalId":159783,"journal":{"name":"1993 IEEE Annual Northeast Bioengineering Conference","volume":"101 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":"122528420","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
Patient care instrumentation for health care professionals 医疗保健专业人员的病人护理仪器
1993 IEEE Annual Northeast Bioengineering Conference Pub Date : 1993-03-18 DOI: 10.1109/NEBC.1993.404358
R. Aston
{"title":"Patient care instrumentation for health care professionals","authors":"R. Aston","doi":"10.1109/NEBC.1993.404358","DOIUrl":"https://doi.org/10.1109/NEBC.1993.404358","url":null,"abstract":"A description is given for course materials needed to teach health-care professionals about biomedical instrumentation. Patient needs are taken into account, as well as the educational background of the health-care professional. A textbook to be published is discussed.<<ETX>>","PeriodicalId":159783,"journal":{"name":"1993 IEEE Annual Northeast Bioengineering Conference","volume":"1 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":"133211739","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
Hydroxylapatite and fluoroapatite coated intramedullary rods in canine femurs 羟基磷灰石和氟磷灰石包覆犬股骨髓内棒
1993 IEEE Annual Northeast Bioengineering Conference Pub Date : 1993-03-18 DOI: 10.1109/NEBC.1993.404383
M.T. Walenciak, M. Zimmerman, M. Deehan
{"title":"Hydroxylapatite and fluoroapatite coated intramedullary rods in canine femurs","authors":"M.T. Walenciak, M. Zimmerman, M. Deehan","doi":"10.1109/NEBC.1993.404383","DOIUrl":"https://doi.org/10.1109/NEBC.1993.404383","url":null,"abstract":"The effect of plasma sprayed synthetic calcium phosphate coatings, specifically hydroxylapatite (HA) and fluoroapatite (FA), on the degree of bone/implant attachment strength was investigated using a canine femoral intramedullary rod model. Titanium grit-blasted rods were implanted bilaterally, right side uncoated and the left side coated, in 12 coonhounds. The degree of bone attachment strength was determined by measuring the push-out force to failure and histological analysis after 3, 6, and 12 months implantation. For each time period there were four canines with either HA or FA coated implants. At 3 months, the HA and FA coatings promoted greater bone attachment strength (FA less so than HA) when compared to uncoated surfaces. At 6 months, all surfaces were statistically equivalent (with the FA, on average, exhibiting a lower strength). At 12 months, the HA and uncoated surfaces were equivalent, with the FA having a significantly lower strength.<<ETX>>","PeriodicalId":159783,"journal":{"name":"1993 IEEE Annual Northeast Bioengineering Conference","volume":"1 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":"131113416","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
Physical aging behavior of a series of biodegradable polymers as a function of the pendent-chain length 一系列生物可降解聚合物的物理老化行为与垂链长度的关系
1993 IEEE Annual Northeast Bioengineering Conference Pub Date : 1993-03-18 DOI: 10.1109/NEBC.1993.404381
S. Bron, J. Fiordeliso, J. Kohn
{"title":"Physical aging behavior of a series of biodegradable polymers as a function of the pendent-chain length","authors":"S. Bron, J. Fiordeliso, J. Kohn","doi":"10.1109/NEBC.1993.404381","DOIUrl":"https://doi.org/10.1109/NEBC.1993.404381","url":null,"abstract":"The physical aging behavior of a series of tyrosine-containing polyarylates was investigated as a function of the length of the alkyl pendent chain. The experiments were performed in a differential scanning calorimeter (DSC) at corresponding aging temperatures. It was found that the physical aging efficiency was strongly affected by small changes in the length of the pendent chain (2, 6, or 8 methylene units). For similar cooling rates from above T/sub g/ to below T/sub g/ and identical aging times, the enthalpy relaxation decreased with the length of the pendent chain. A free volume based explanation is suggested.<<ETX>>","PeriodicalId":159783,"journal":{"name":"1993 IEEE Annual Northeast Bioengineering Conference","volume":"62 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":"129818195","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
Fabrication of microstructures for modeling transport in porous materials 模拟多孔材料输运的微结构制备
1993 IEEE Annual Northeast Bioengineering Conference Pub Date : 1993-03-18 DOI: 10.1109/NEBC.1993.404382
D. J. Mears, S. Straka, W. Saltzman, N. F. Sheppard
{"title":"Fabrication of microstructures for modeling transport in porous materials","authors":"D. J. Mears, S. Straka, W. Saltzman, N. F. Sheppard","doi":"10.1109/NEBC.1993.404382","DOIUrl":"https://doi.org/10.1109/NEBC.1993.404382","url":null,"abstract":"Silicon micromachining was used to fabricate microstructures for modeling transport in porous systems. A linear network of pores connected by narrow channels was etched into silicon to create constricted pore networks. The use of micromachining enables the creation of structures having the same characteristic dimensions as the pore networks found in polymeric controlled release systems. A two mask process was developed to reduce undercutting of convex corners during the anisotropic etching of the silicon. Initial studies of the release of a fluorescent dye out of the micromachined pore network are presented.<<ETX>>","PeriodicalId":159783,"journal":{"name":"1993 IEEE Annual Northeast Bioengineering Conference","volume":"13 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":"114595272","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
Signal analysis with a newly designed electrocardiograph using switched capacitor filters 使用开关电容滤波器的新设计心电图仪的信号分析
1993 IEEE Annual Northeast Bioengineering Conference Pub Date : 1993-03-18 DOI: 10.1109/NEBC.1993.404352
R. Hross, L. Prastitis, Sotirios G. Ziavras
{"title":"Signal analysis with a newly designed electrocardiograph using switched capacitor filters","authors":"R. Hross, L. Prastitis, Sotirios G. Ziavras","doi":"10.1109/NEBC.1993.404352","DOIUrl":"https://doi.org/10.1109/NEBC.1993.404352","url":null,"abstract":"Switched capacitor filters are integrated into a hand-held electrocardiograph. Analysis of repetitive signals from human subjects is facilitated by an exceptionally large rolloff (100 dB/dec) at low frequencies (20 Hz). Sensitivity to harmonics is easily accomplished by changing a single resistor setting. Signal analysis of this cleanliness and selectivity has, up to now, only been possible on very, very large machines.<<ETX>>","PeriodicalId":159783,"journal":{"name":"1993 IEEE Annual Northeast Bioengineering Conference","volume":"9 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":"133359822","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
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