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Heart rate variability and motion artifact are two major obstacles to the photoplethysmographic (PPG) signal analysis, which is a very promising tool to derive useful information about the hemodynamics as well as autonomic nerve system. This paper suggests employing a truncation/extrapolation method on the PPG signal or its first order derivative to overcome the heart rate variability problem while...
Brain hemodynamic responses (BHR) of healthy subjects and migraineurs performing a breath holding task are measured by functional near-infrared spectroscopy (fNIRS) method. The response curves are deconvolved from a rectangular input function to yield the impulse response (IR) function of BHR which was then modeled by a summation of three gaussians. Our results show that the amplitude coefficients...
Motion artifact reduction and separation become critical when medical sensors are used in wearable monitoring scenarios. Previous research has demonstrated that independent component analysis (ICA) can be applied to pulse oximeter signals to separate photoplethysmographic (PPG) data from motion artifacts, ambient light, and other interference in low-motion environments. However, ICA assumes that all...
Inspiring product is a kind of product that enhances the existing product with a close-loop system to detect the user's health and to inspire the body in a beneficial way. The bio-signals of the users are being measured and the body is stimulated while the traditional functions of the product are used. An inspiring computer mouse prototype is specialized in this paper as an example of inspiring product...
Brain imaging technology employing near-infrared spectroscopy (NIRS) has great potential in various applications to daily life, by virtue of offering handy equipment and an easy measurement method. In this paper, we propose a novel application of NIRS to evaluation of feeling. As compared with an electroencephalogram, the NIRS offers easier attachment of probes on the scalp, because it does not require...
Utilizing near-infrared spectroscopy for non-invasive blood component concentration sensing has been a focusing topic in biomedical optics applications. The ease of use, low cost and portability of these methods is a clear advantage over the invasive blood component concentration sensing which is the main sensing method in the clinic application. However, there is no report about any successful non-invasive...
Spinal cord injured patients suffer from unstable regulation of their cardiovascular function due to nerve damage caused by the injury. Currently there is no well established method for continuous monitoring and assessment of cardiovascular regulation in spinal cord injured patients during rehabilitation. Therefore, a design for a cardiovascular regulation monitoring device capable of detecting blood...
Understanding arterial distensibility has shown to be important in the pathogenesis of cardiovascular abnormalities like hypertension. It is also known that arterial pulse wave velocity (PWV) is a measure of the elasticity or stiffness of peripheral arterial blood vessels. However, it generally requires complex instrumentations to have an accurate measurement and not suited for continual monitoring...
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