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- W289704327 abstract "Near-infrared radiation is absorbed much more by intravascular hemoglobin than by water. This characteristic is exploited in personal certification technology. However, so far there have been few applications of blood vessel imaging using near-infrared radiation to medical instrumentation. In this study, we constructed an experimental system that uses near-infrared radiation to obtain images of blood vessels in a subject's finger while the upper arm of the subject is compressed. Using this system, we investigated the effects of two parameters, the compression pressure applied to the upper arm and the age of the subjects, on the imaging of blood vessels. Forty-five normal men and women (aged 20-64 years) participated in this study. In the results for the influence of compression of the upper arm, there was a significant increase (p<0.05) in the change in the average brightness (gray scale value) of the imaging of blood vessels with an increase in the compression when the compression was less than 80mmHg. However, the change in the average brightness for a compression of 150mmHg was significantly (p<0.01) lower than those for compressions of 80mmHg and 100mmHg; this is thought to be due to the arterial and venous compliances. There was a negative correlation (r=-0.608, p<0.001) between the age of the subjects and the time to reach the half the convergent value for the change in the average brightness. One of the contributing factors for this is considered to be the reduction in the venous compliance with age." @default.
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- W289704327 date "2009-01-01" @default.
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- W289704327 title "Change in Blood Vessel Images in Human Finger Using Near-Infrared Radiation while Compressing the Upper Arm : Effect of the Compression Pressure and the Age of Subjects(Mechanical Systems)" @default.
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- W289704327 doi "https://doi.org/10.1299/kikaic.75.2280" @default.
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