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2010 IEEE International Ultrasonics Symposium

作者： Ying Li Tae-Hoon Bok Jeong-Hwa Yang Min-Joo Choi Dong-Guk Paeng Department of Oceanic Information and System Engineering Interdisciplinary Postgraduate Program in Biomedical Engineering

ISBN: (纸本)9781457703829

The cyclic variation in echogenicity (CVE) was observed from the cross-sectional images of the common carotid artery using coded harmonic imaging of a GE ultrasound system. The objective of this research is to study the smoking acute effects on the amplitude of the CVE (A_(cve)). A_(cve) was analyzed among the 28 smokers before and after 1-2 cigarettes were smoked. The smokers were optimally divided into two clusters with respect to the change in A_(cve) and the intrinsic characteristics of smokers (i.e., daily consumed cigarettes and smoking years) through a two-step cluster analysis (TSCA). The relative change of A_(cve) after smoking was significantly higher in the heavy smoker cluster compared with the light smoker cluster. However, there is no significant difference in the absolute value of A_(cve) between before and after smoking for both two clusters. The effect of tissue attenuation on A_(cve) was compensated with body mass index (BMI). The compensated parameter, A'_(cve), is significantly increased in heavy smoker group after smoking (BS: 0.47+-7.4;AS: 5.4+-8.0;p<0.05). It is in agreement with the analytical result of (DELTA)A_(cve). Furthermore, after smoking, A'_(cve) is significant higher in heavy smoker group (5.4+-8.0), compared with light smoker group (-1.3+-6.7;p<0.05). It suggests that the compensation of A_(cve) is help to reduce the interference from tissue attenuation and is good for the comparison among individuals.

关键词： Ultrasonic imaging Attenuation Blood Harmonic analysis Carotid arteries biomedical imaging

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The smoking acute effect on the cyclic variation in blood echogenicity fromthe common carotid artery

The smoking acute effect on the cyclic variation in blood ec...

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IEEE International Ultrasonics Symposium

作者： Li, Ying Bok, Tae-Hoon Yang, Jeong-Hwa Choi, Min-Joo Paeng, Dong-Guk Department of Oceanic Information and System Engineering Korea Republic of Interdisciplinary Postgraduate Program in Biomedical Engineering Korea Republic of Department of Medicine Jeju National University Korea Republic of Department of Radiotechnology Cheju Halla College Korea Republic of

ISBN: (纸本)9781457703829

The cyclic variation in echogenicity (CVE) was observed from thecross-sectional images of the common carotid artery using coded harmonic imagingof a GE ultrasound system. The objective of this research is to study thesmoking acute effects on the amplitude of the CVE (Acve). A cve was analyzed among the 28 smokers before and after 1-2 cigaretteswere smoked. The smokers were optimally divided into two clusters with respectto the change in Acve and the intrinsic characteristics of smokers(i.e., daily consumed cigarettes and smoking years) through a two-step clusteranalysis (TSCA). The relative change of Acve after smoking wassignificantly higher in the heavy smoker cluster compared with the light smokercluster. However, there is no significant difference in the absolute value ofAcve between before and after smoking for both two clusters. Theeffect of tissue attenuation on Acve was compensated with body massindex (BMI). The compensated parameter, A'cve, is significantlyincreased in heavy smoker group after smoking (BS: 0.477.4;AS: 5.48.0;p0.05).It is in agreement with the analytical result of AA cve. Furthermore,after smoking, A'cve is significant higher in heavy smoker group(5.48.0), compared with light smoker group (1.36.7;p0.05). It suggests that thecompensation of Acve is help to reduce the interference from tissueattenuation and is good for the comparison among individuals. © 2010 IEEE.

关键词： Health

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Determination of the diffusivity and location and pressure dependent permeability of porcine coronary arteries

Determination of the diffusivity and location and pressure d...

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ASME 2010 Summer Bioengineering Conference, SBC 2010

作者： Keyes, Joseph T. Borowicz, Stacy Utzinger, Urs Simon, Bruce Vande Geest, Jonathan P. Graduate Interdisciplinary Program in Biomedical Engineering University of Arizona Tucson AZ United States Department of Aerospace and Mechanical Engineering University of Arizona Tucson AZ United States BIO5 Institute for Biocollaborative Research University of Arizona Tucson AZ United States Department of Biomedical Engineering University of Arizona Tucson AZ United States

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High-density array of single cell traps for high-throughput imaging of calcium dynamics in response to oxidative stress

High-density array of single cell traps for high-throughput ...

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14th International Conference on Miniaturized Systems for Chemistry and Life Sciences 2010, MicroTAS 2010

作者： Rivet, Catherine A. Chung, Kwanghun Kemp, Melissa L. Lu, Hang Interdisciplinary Program in Bioengineering Georgia Institute of Technology United States School of Chemical and Biomolecular Engineering Georgia Institute of Technology United States Wallace H. Coulter Department of Biomedical Engineering Georgia Institute of Technology Emory University United States

ISBN: (纸本)9781618390622

Stochasticity in gene expression, protein or metabolite levels contributes to cell-cell variations. The analysis of these variations could lead to a better understanding of cellular processes and drug responses, but require single cell analysis techniques. To this end, we developed a new microfluidic platform for high-throughput capture (in about a minute) with low shear and imaging of thousands of single cells. This platform is compatible with upstream components for complex cell stimulation patterns. Imaging of calcium dynamics in response to oxidative stress with this platform reveals variable phenotypic responses within clonal populations.

关键词： Calcium

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The smoking acute effect on the cyclic variation in blood echogenicity from the common carotid artery

The smoking acute effect on the cyclic variation in blood ec...

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ISBN: (纸本)9781457703829

The cyclic variation in echogenicity (CVE) was observed from the cross-sectional images of the common carotid artery using coded harmonic imaging of a GE ultrasound system. The objective of this research is to study the smoking acute effects on the amplitude of the CVE (Acve). A cve was analyzed among the 28 smokers before and after 1-2 cigarettes were smoked. The smokers were optimally divided into two clusters with respect to the change in Acve and the intrinsic characteristics of smokers (i.e., daily consumed cigarettes and smoking years) through a two-step cluster analysis (TSCA). The relative change of Acve after smoking was significantly higher in the heavy smoker cluster compared with the light smoker cluster. However, there is no significant difference in the absolute value of Acve between before and after smoking for both two clusters. The effect of tissue attenuation on Acve was compensated with body mass index (BMI). The compensated parameter, A'cve, is significantly increased in heavy smoker group after smoking (BS: 0.477.4;AS: 5.48.0;p0.05). It is in agreement with the analytical result of AAcve. Furthermore, after smoking, A'cve is significant higher in heavy smoker group (5.48.0), compared with light smoker group (1.36.7;p0.05). It suggests that the compensation of Acve is help to reduce the interference from tissue attenuation and is good for the comparison among individuals. © 2010 IEEE.

关键词： Tobacco

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Erratum to: Enzymatic- and temperature-sensitive controlled release of ultrasmall superparamagnetic iron oxides (USPIOs)

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Journal of Nanobiotechnology 2011年第1期9卷 1-1页

作者： Shann S Yu Ryan A Ortega Charleson S Bell Todd D Giorgio Randy L Scherer Conlin P O'Neil Jeffrey A Hubbell Department of Biomedical Engineering Vanderbilt University Nashville Tennessee USA Vanderbilt Institute for Nanoscale Science and Engineering Vanderbilt University Nashville Tennessee USA Interdisciplinary Program in Materials Science Vanderbilt University Nashville Tennessee USA Integrative Biosciences Institute École Polytechnique Fédérale de Lausanne Lausanne Switzerland

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Nonconstrained sleep monitoring system and algorithms using air-mattress with balancing tube method

Nonconstrained sleep monitoring system and algorithms using ...

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作者： Shin, Jae Hyuk Chee, Young Joon Jeong, Do-Un Park, Kwang Suk Interdisciplinary Program on Biomedical Engineering Seoul National University Graduate School Chongno-Ku Seoul 110-799 Korea Republic of Department of Biomedical Engineering Ulsan University Ulsan 680-190 Korea Republic of Department of Neuropsychiatry Clinical Research Institute Seoul National University College of Medicine and Hospital Chongno-Ku Seoul 110-799 Korea Republic of Department of Biomedical Engineering College of Medicine Seoul National University Chongno-Ku Seoul 110-799 Korea Republic of

We evaluated the performance of a bed-type sensor system using the air-mattress with balancing tube (AMBT) method to noninvasively monitor the signals of heartbeat, respiration, and events of snoring, sleep apnea and body movement of subject on the system. The proposed system consists of multiple cylindrical air cells, two sensor cells and 18 support cells, and the small physiological signals were measured by the changes in pressure difference between the sensor cells, and the dc component was removed by balancing tube that is connecting the sensor cells. Using newly developed AMBT method, heartbeat, respiration, snoring, and body movement signals were clearly measured. For the concept of a home healthcare system, two automatic processing algorithms were developed: one is to estimate the mean heart and respiration rates for every 30 s, and another one is to detect the snoring, sleep apnea, and body movement events from the measured signals. In the beat-to-beat heart rate and breath-by-breath respiration rate analyses, the correlation coefficients of the heart and respiration rates from the proposed AMBT method compared with reference methods, electrocardiogram, and respiration effort signal from piezoelectric belt, were 0.98 (p

关键词： Electrocardiograms

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The effects of angiotensin ii infusion on the mechanical response and microstructural organization of mouse aorta

The effects of angiotensin ii infusion on the mechanical res...

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ASME 2010 Summer Bioengineering Conference, SBC 2010

作者： Haskett, Darren Fouts, Marie Utzinger, Urs Larson, Doug Azhar, Mohamad Geest, Jonathan Vande Biomedical Engineering Graduate Interdisciplinary Program University of Arizona United States BIO5 Institute for Collaborative Bioresearch University of Arizona Tucson AZ United States Department of Medical Pharmacology College of Medicine University of Arizona United States Department of Surgery Sarver Heart Center University of Arizona Tucson AZ United States Department of Aerospace and Mechanical Engineering University of Arizona Tucson AZ United States Department of Biomedical Engineering University of Arizona Tucson AZ United States

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The effect of contrast enhancement on familiar face recognition with simulating prosthetic vision

The effect of contrast enhancement on familiar face recognit...

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Cairo International biomedical engineering Conference, CIBEC

作者： M. H. Chang H. S. Kim K. S. Park Interdisciplinary Program Bioengineering Graduate School Seoul National University South Korea Department of Biomedical Engineering College of Medicine Seoul National University South Korea

Many research teams have studied to make the blind see by stimulating the retina cells using electrical devices. But due to the limited number of electrodes, it needs to complement low resolution with image processing. In this paper, we tried to find the effect of image processing, especially with contrast enhancement (CE) technique. We investigated face recognition performance with three different resolutions (8×8, 12×12, 16×16). Especially test images used here were facial images of subjects' familiar colleagues. Also we compared the performances with those of edge detection(ED) technique in 16×16 resolution. The results showed significant higher accuracy of face recognition with 8×8 resolution when using CE technique. Moreover accuracy with CE was much higher than that with ED.

关键词： Image resolution Face recognition Accuracy Prosthetics Pixel Image edge detection

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Effect of sensor configurations on indirect-contact photoplethysmogram measurement system

Effect of sensor configurations on indirect-contact photople...

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Cairo International biomedical engineering Conference, CIBEC

作者： Hyun Jae Baek Soo Young Sim Jung Soo Kim Kwang Suk Park Graduate Program in Bioengineering and Advanced Biometric Research Center Seoul National University South Korea Samsung Group Interdisciplinary Program in Medical and Biological Engineering Seoul National University South Korea Department of Biomedical Engineering College of Medicine and Advanced Biometric Research Center Seoul National University South Korea

Indirect-contact photoplethysmography is a new approach to measure photoplethysmogrm over clothing for unconstrained and unconscious monitoring purpose. In this paper, the effect of sensor configurations on indirect-contact photoplehysmography was investigated. Sensor configuration was classified into two groups. One was multiple light sources with centered photo-detector configuration and the other was multiple photo-detectors with centered light source configuration. Total 8 kinds of sensors were tested. Experimental results showed that although both sensor groups have possibility to photoplethysmogram measurement over clothing, sensors with multiple light sources showed better performance when thick clothes were considered. Sensor configuration should be selected with regard to its application considerations such as power consumption or target subjects.

关键词： Light sources Light emitting diodes Photonics biomedical measurements Cotton Clothing Thickness measurement

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