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 t...
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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 (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.
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 the...
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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 r...
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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.
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 t...
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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 ...
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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
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...
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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.
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-c...
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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.
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